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',_ }. I LIBRARY COPY NOV2 4 1967 r,_ANNE9 SPACECRAFT CENTER HOUSTON, TEXAS e,,,,r | Z' -I Og WUO_I AJ.l'll_)¥d SID 67-498 STUDY OF APOLLO WATER IMPACT FINAL REPORT VOLUME 5 USER'S MANUAL- NO INTERACTION .MW. 1967 (Contract NAS9-4552, G.O. 5264) GPO PRICE $ CFSTI PRICE(S) $ -,,.;' Prepared by -v, Ha...4_.opy (HC) _: J.P.D. Wilkinson Microfiche (MF) (Author) ff 653 July 65 / F.C. H_ Program Manager / Structures and Materials Approved by L.A. Harris istant Manager e and Technology NORTH AMERICAN AVIATION, INC. SPACE DIVISION https://ntrs.nasa.gov/search.jsp?R=19680002458 2020-05-19T18:32:46+00:00Z
Transcript
Page 1: I LIBRARY COPY · 2013-08-31 · • i library copy nov24 1967 r,_anne9 spacecraft center houston, texas e,,,,r| z' -i • og wuo_i aj.l'll_)¥d sid 67-498 studyofapollowaterimpact

',_ }.

• I

LIBRARY COPY

NOV24 1967

r,_ANNE9 SPACECRAFT CENTERHOUSTON, TEXAS

e,,,,r|

Z' -I

• Og WUO_I AJ.l'll_)¥d

SID 67-498

STUDY OF APOLLOWATER IMPACT

FINAL REPORT

VOLUME 5

USER'S MANUAL- NO INTERACTION

.MW.1967

(Contract NAS9-4552, G.O. 5264)

GPO PRICE $

CFSTI PRICE(S) $

-,,.;' Prepared by-v, Ha...4_.opy (HC)

_: J.P.D. Wilkinson Microfiche (MF)

(Author)ff 653 July 65

/ F.C. H_

Program Manager /Structures and Materials

Approved by

L.A. Harris

istant Manager

e and Technology

NORTH AMERICAN AVIATION, INC.

SPACE DIVISION

https://ntrs.nasa.gov/search.jsp?R=19680002458 2020-05-19T18:32:46+00:00Z

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PRECEDING PAGE BLANK NOT FILMED.

FOREWORD

This report was prepared by North American Aviation, Inc., Space

Division, under NASA Contract NAS9-455Z, for the National Aeronautics and

Space Administration, Manned Space Flight Center, Houston, Texas, with

Dr. F.C. Hung, Program Manager and Mr. P.P. Radkowski, Assistant

Program Manager. This work was administered under the direction of

Structural Mechanics Division, MSC, Houston, Texas with Dr. F. Stebbins

as the technical monitor.

This report is presented in eleven volumes for convenience in handling

and distribution. All volumes are unclassified.

The objective of the study was to develop methods and Fortran IV

computer programs to determine by the techniques described below, the

hydro-elastic response of representation of the structure of the ApoUo Com-

mand Module immediately following impact on the water. The development

o£ theory, methods and computer programs is presented as Task I Hydro-

dynamic Pressures, Task II Structural Response and Task ILl Hydroelastic

Response Analysis.

Under Task I - Computing program to extend flexible sphere using the

Spencer and Shiffman approach has been developed. Analytical formulation

by Dr. Li using nonlinear hydrodynamic theory on structural portion is

formulated. In order to cover a wide range of impact conditions, future

extensions are necessary in the following items:

a. Using linear hydrodynamic theory to include horizontal velocity

and rotation.

b. Nonlinear hydrodynamic theory to develop computing program on

spherical portion and to develop nonlinear theory on toroidal and

conic sections.

Under Task II - Computing program and User's Manual were developed

for nonsymmetrical loading on unsymmetrical elastic shells. To fully

develop the theory and methods to cover realistic Apollo configuration the

following extensions are recommended:

a. Modes of vibration and modal analysis.

b. Extension to nonsymmetric short time impulses.

- iii -

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c. Linear buckling and elasto-plastic analysis

These technical extensions will not only be useful for ApoUo and

luture Apollo growth configurations, but they will also be of value to other

aeronautical and spacecraft programs.

The hydroelastic response ol the flexible shell is obtained by the

numerical solution of the combined hydrodynamic and sheU equations. The

results obtained herein are compared numerically with those derived by

neglecting the interaction and applying rigid body pressures to the same

elastic shell. The numerical results show that for an axially symmetric

impact o£ the particular shell Studied, the interaction between the shell and

the fluid produces appreciable differences in the overaU acceleration of the

center of gravity of the shell, and in the distribution of the pressures and

responses. However the maximum responses are within 15% of those pro-

duced when the interaction between the fluid and the shell is neglected. A

brief summary of results is shown in the abstracts of individual volume s.

The volume number and authors are listed on the following page.

The contractor's designation for this report is SID 67-498.

- iv -

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INDEX FOR FINAL REPORT

"Apollo Water Impact"

Volume No.

4

5

6

9

10

11

Volume Title

Hydrodynamic Analysis of Apollo

Water Impact

Dynamic Response of Shells of

Revolution During Vertical ImpactInto Water - No Interaction

Dynamic Response of Shells of

Revolution During Vertical Impact

Into Water - Hydroelastic

Interaction

Comparison With Experiments

User's Manual - No Interaction

User's Manual - Interaction

Modification of Shell of Revolution

Analysis

Unsyrnrnetric Shell of Revolution

Analysis

Mode Shapes and .Natural

Frequencies Analysis

User's Manual for Modification of

Shell of Revolution Analysis

User's Manual for Unsymmetric

Shell of Revolution Analysis

TO

Author,,

Li and T. Sugimura

A.P. Cappelli, and

J. P.D. Wilkinson

J. P.D. Wilkinson,

A.P. Cappelli, and

R.N. Salzman

J. P.D. Wilkinson

J. P.D. Wilkinson

J. P.D. Wilkinson and

R.N. Salzman

A.P. Cappelli and

S.C. Furuike

A.P. Cappelli,

T. Nishimoto,

P.P. Radkowski and

K.E. Pauley

A.P. Cappelli

A.P. Cappelli and

S.C. Furuike

E. Carrion,

S.C. Furuike and

T. Nishimoto

- v -

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PRECEDING PAGE BLANK. NOT _LI_ED,

ABSTRACT

This volume is a userts manual for a computer pro-

gram which determines the dynamic response of a shell

of revolution during a vertical axially symmetric impact

into an incompressible fluid. The Program uses the

theory developed in Volume 2 of this report where nointeraction between the fluid and the flexible shell is

accounted for. The hydrodynamic pressures are deter-

mined on the basis of a rigid-body theory, and are applied

to the shell as a forcing function. The results are intended

for comparison with similar calculations derived from

Volume 3 and the UserWs Manual of Volume 6 where the

hydroelastic interaction is accounted for.

- vii -

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PRECEDING PAGE BLANK NOT HU_ED.

CONTENTS

I.I

Z.l

5.1

6.1

7.1

LIST OF ILLUSTRATIONS

LIST .OF TABLES

INTRODUCTION .......

l.Z Load Map . .......

PROGRAM FLOW DESCRIPTION . . .

2.2 Program Deck Setup .....

RESTART .........

INPUT DATA FORMAT.

4.2

4.3

4.4

4.5

DECRD Subroutine.

Data Deck Setup .

Call DECRD (DA) . .

Boundary Conditions .

4.5. 1 Top Boundary .

4.5.2 Bottom Boundary

Call DECRD (GDA). .

Call DECRD (CDA). .

• 6 • • • • •

SAMPLE PROBLEM . . ....

5. Z Sample Input Data for the Start from Zero

5.3 Sample Input Data for the Restart" . .

5.4 Sample Output .......

WARNINGS AND RECOMMENDATIONS . .

6.1.1 Choice of Time Interval . . .

6. I. 2 Number of Iterations . . .

6.1.3 DECRD ......

PROGRAM LISTINGS ......

Page

xi

xi

9

13

15

17

18

20

21

22

22

25

28

29

33

35

42

49

81

81

81

81

82

- ix -

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PRECEDINGPAGE BLANK NOT FILMED.

LXST OF ILLUSTRATIONS

Figure

1

ZFlow of Executive Program 157 DR

Model of Sample Problem .

Page

• I0

54

LIST OF TABLES

Table

I Description of Links.

Page

1

- xi -

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t

_ ,? 1.1 INTRODUCTION

The computer program for the calculation of the dynamic response

of shells of revolution during vertical impact into water when no interaction

is present is written entirely in FORTRAN IV and makes use of the overlay._'.J!!':J:feature of that language. The program has been checked out in NAASYS, the

NAA adaptation of the IBM 7090/7094 IBSYS/IBJOB system; and uses the

-_ NAASYS library routines shown in the load map, pages 4 to 8, inclusive,• _ of Section I.Z. r

The NAASYS input tape is Unit 5, the output tape is Unit 6. In addition

to:these files, the program uses Units 8, 9, I0, and 11 as scratch tapes,and Unit7 as the overlay tape. NAASYS itself is stored on Unit I.

The program is made up of an executive program and eight links, all

of which are called by the executive program. A brief description of eachlink is shown in Table I below.

Table I. Description of Links

Link

No.

0

2

3

4

5

6

7

8

Name

Executive

GEOM

CDAFIT

ACCN

DEFLTN

PATH

INTLDS

PSUMS

PIX

Purpose

Reads general data, DA, and controls flow of

execution of other links

Reads geometric parameters. Prints all geometric

input and calculated values

Sets up stiffness parameters

Computes hydrodynamic pressures onthe shell

Calculates the deflections due to the pressures

Controls flow after computation of deflections.

Computes velocities and accelerations

Computes internal loads

Outputs all computed quantities

A dummy subroutine for a CRT Plotter

- 1 -

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1.2 Load Map

PRECEDING PAGE BLANK NOT FILMED.

- 3 -

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^

-il

I

_t

tJU

fZ

ZIml

UJZ

(.n<[

0Z

t_0

<[t,J

Z

0

-J

Q

0 0 0 OI O' 0 0 0

• 1

_ -J z -

u.I UJ U.I UJ UU UJ; UJ

41_ _[ ,It O_ ,IC ,1( ,_, <[m. m. m. :, o. m. Q.Z _l

Z Z _- Z Z

1

' 1i

Z:' Z Z Z_ Z Ziml_ i.i iml

I

I1 I

" _1 _"

-4-

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- /

,It

G..el5-

)..c_C_5-uJ_r

4_

f,.

0

-rI.-

0,00,0

O0

r-op.4h..(,q

t/

",rI.-.

,_ N i1".- 0

000II

Zol

ZZZZ'Z ZZ_ _ _ _ _._ _ _I_

ZNq.D

0.J

"_I_IAI IAI

I I,-lO

e_Z:

_g

i

_ tl, tl,

e_

I_ ,.=l _tMt e U-

.J

@ • ell_ @

t&'_ ,_ f,,. NtN N _lq

N_ O_ ¢)000,000

:i _--__!_-° "uJ 0 s,) 7;0 Z ,.I

I--¢.9z

u,I..i

0

zc2Z

tl

uJ=[

Z

OiO 0000'000

I-- _. Z _C]!4.) I-- w,,- ,'_ e"

Z IAI t/) _' Z ,,.,* C_

_',<[ .J ..I =.1 -J_..$ _r ,_"

Z _0 _"!

0 0'000

I,-- IZ I.- _/'I>( _ I._0'_ I"-Z LU )" _ X IAJ X_U. • C£

_. IMU _I • o.-.e e_ e_ •"_l

I

-5-

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'I

+

-6-

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n

41'41'

i

1

V"l_

1,-, u- U,,

41,

00-'_

0 • JLL Im ,...I

LI.I 1,1..M.

,,0miniI%1

LaL

0,.M..

(%1',0p-

I, I

OJL

eO

_N NN N

i

• • J

,,0 I,_

:41, 4g.

• ,,,o i('_l

(_11%l N (%l N r_lNN _NNNN

ZZ _1 -J _ ..a

• • • •

(%1 (%1

Z 0

ON

-7-

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h-

ua

i

I

F

N _ 'N ffl 'N N N 'fit I_

E _ ..I

Z-- iZ uJ Zxujr_ luJ _- u4_

UJU ]14J Lu U4

i

-o I-."

Z Zua_ IJu

IJuZ IJLI

"1"

Z --,Z Z ZuJ [ P_u._ uJ l.u:_

_00 _0 _n 0

TU. Z U EQU UUW '_

N ;

.f

_z

m

Z Z :

_. '_ U_ I

I

II

O;

0 _-

0 ,._

I- 3:I-_ I.-

°•._ 0

f15 wr_

Ill 8

uJz

'_ ZU_

J

-8-

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, k

Z. 1 PROGRAM FLOW DESCRIPTION

An overall flow diagram of the executive program 157DR is shown in

Figure |. A listing of the complete program is shown in Section 7. I.

- 9-

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"\

I,/

• i I

S

i

READ TITLE ]p, Vo and W

L J _ t i

- 10

Ti_ - 0Rewind scratc

tapes

Read shell data

Set time

interval

TDEL

r

20

call GEOM

reads and computes geometric

parameters

2Sl'-Rewind Unit 8 1

D

Figure 1. Flow of Executive Program 157 DR (Sheet 1 of 3)

- 10 -

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TFILT, O

ii I

@

I , .,x, _oI1_ I i

I,c,alCRmT I! read and set up

I stiffness! pa_ters

&-_- oO L-T .0

<0

Figure i.

I

call ACCN

calculate impact

pressures

-1 40 ,

Call DEFLTN

calculate

deflections

I Call PATH

determines program

Computes

velocity & accelerations

>0

Flow of Executive Program 157 DR (Sheet 2 of 3)

- 11 -

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.:H

/..0

I jT "¸

outputs co_uted I

_0

_r .ooi

721LT.001

_0

90

= 0

80

Call PIX

Punch outputFor a restart

©Figure 1. Flow of Executive Program 157 DR (Sheet 3 of 3)

- 12 -

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2.2 Program Deck Setup:, J

As explained in Section I. Ij the deck is set up in overlay regions.

Each region is denoted by a $ORIGIN control card. A list of the setup is

shown below. It includes the control cards and deck names. The order of

these decks must be kept in the given sequence.

- 13 -

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I

• j,.

_rO1 Cards_ L_,: ..

":._.,"Sm_'rc

$ORIGmSmF'rc

:,$1BFTC

$1BFTC:SO.Gin$IBFTC _

$LBFTGSO.GIN$IBFTC

$1BFTC

$1BFTC

$ORIGIN

$IBFTC "

$ORIGIN

$IBFTC

$ORIGIN

$OBFTC

$ORIGIN

$IBFTC

SDATA

157 DR

MMPY

MADD •

CHAIN = - _ .

_TaY. •

c_...cnA,_TC0DSENTP

CHAIN..

ACCN2

PMAXX

CHAIN

157DRI

MSUB

INVRS

CHAIN

WHERE

CHAIN

157DRZ

CHAIN

FS UMS

CHAIN, SYSUT2,LNK6

REW

Subroutine s, , , Lu ,,

Main program

ADD"..

GEOM

CODIMA

CRVFIT

CODI/_A

ENTERP

ACCN

PMAXL

DEFLTN

MSU

INV

PATH

INTLDS

SUMS

PIX

- 14 -

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3. I RESTART

In many calculations, it may be desired to restart the program at some

time t s without recalculating all the response quantities from zero to t s. In

addition, if it is desired to calculate the response atmore than about IZ0 time

intervals, it is necessary to make a,restart (see Section 6. I. 2).

For a run from zero, the following indicators are set:

: o.oPNCH = I. 0

Here, the condition RESTRT = 0.0 means that it is a start from zero. The

condition PNCH = I. 0 means that at the end of the job certain quantities will

be punched on cards to be used as data in a future restart. Thus, part of the

output from this job will be some cards containing the arrays

TIMX

ZP(K, L)

ZZP(K, L)

Z3P(K, L)

OMGZ(L)

This punching is done by the executive program 157DR.

In order to restart the job, the following indicators are set in the

input data:

RESTRT : i. 0

PNCH : i. 0

Here, the condition RESTRT : 1.0 means that the punched output data of the

previous job is to be read as input data. The indicator PNCH = 1.0 means

that there will also be punched output at the end of this job. If PNCH = 0.0,

no data will be punched and no future restart will be possible. The punched

cards are put at the end of the data deck. They are read by subroutineCRVFIT.

- 15 -

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pB,EGED|NG pAGE BLANK NOT I:iLI',AED-

4. 1 INPUT DATA FORMAT

Data are entered into the program by three subroutines.. The

executive program 157DR reads the hydrodynamic data, and the DA region

of the shell data. Subroutine GEOM reads the GDA region of shell data,

and subroutine CDAFIT reads the CDA region of the shell data. The regions

DA, GDA, and CDA are read by means of the DECRD subroutine.

- 17-

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4.2 DECRD Subroutine- ....7.. 06 3.......

The data in regions

DA, GDA, and CDA is

read by means o£ the

DECRD subroutine, A

descrip_on of the sub-

routine follows, together

with a listing in i

FORTRAN IV.

DECRD Decimal Read

le Description. When a minus sign isencountered in column 1 of aDECRD data card, that card will be

read and then reading will beterminated.

The index of a DECRD card must

be wri_en to the extreme right of

the first 1Z-column field.

2. Extent: 78 locations.

3. Call Statement:

CALL DECRD (ARRAY)

, . Z. 4_3 _5 .....

2 O. -6 5 - _E + O.Z

• 4.9: . . . .E 2; I , " i "':/ ;;, * ;,,

- 7... 8_ 9.5. E. 2_

- 0 . 0......

2.9 75 ....... +3

1.2 3. 4. _ . 20 00

The first card will result in informa-

tion being stored as fo_ows:

ARR(1) -0. 7063E 01

ARR(Z) Uncha_ed

ARR(3) 0. Z435E-00ARR(4) 0. Z065E 04ARR(5) 0. 4649E 04

The - sign in column 1 of the second

card signals that this is the last cardto be read under control of this CALLDECRD statement. This card has

been written to illustrate some types

of errors (or possible errors) inwriting the data. The informationwill be stored as follows:

0

o

e

where ARRAY is the name of the

read array to be read. This argu-

ment may be subscripted.

Error indication: If the index field

is zero or blank, the comment"BAD DATA CARD" and the con-

tents Of columns 73-80 Of the

defective card _11 be printed. Thejob will be terminated,

Example: Assume a CALL DECRD(ARR) statement and the followingdata cards:

ARR(I I)

ARR(IZ)

ARR(lS)

ARR(14)

ARR(15)

O. 7896E Zl (Exponentmislocated or

incomplete. )

Unchanged (Treated as

a blank. )

Unchanged (Treated asa blank. )

0. 2975E 040. IZ34E 03

When no decimal point is written, asin the last two items, the data is read

by the E12.8 format: the number ofdecimal places is counted from thebeginning of the exponent field, if any,or from the extreme right of thefield.

0

- 18-

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000

n-U

U

kJualzalo

kJ

u-im i

II

i

_o_o___o o

A

d5 r-_O

0

if5 U ,.--_

I.--- J _ O

o N

O,-'_ -J_0 "_ ,..0_-, u.,_, Urn

_-0_

_o_

!1

I

I

o o o55 5 _

o

oO

uJ@

A

I--

Z

o o

_ ocI--u o

_ O

,-, t5 l

I--

U_ O

o+ Z) u

7,_ "_}

" e

_°_, _ _o3 _nO

<

$<,r-t

<I.-

123

_tn

on-

_D_ _'_ L_

ob

I

i

- 19

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It

2.

3.

4.

5.

4.3 Data Deck Setu p

Data decks should be stacked as follows:

Three title cards (which may be blank,

A card with VIN, RHO,

DA, general shell data,

if necessary).

WT.

read by executive program.

GDA, geometry data, read by GEOM subroutine.

CDA, section properties data, read by CDAFIT subroutine.

The data in groups 3, 4, and 5 should have a minus sign in column 1of the last card.

The following tables show the nature of the DA, GDA, and CDA decks.

:J

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• f

4.4 Call DECRD (DA)

DECRD

Index

1

Z

3

4

5

8

II

IZ

14

16

17

18

Z5

Z6

Z7

Z8

Z9

30

33

36

37

4440

4476

Name

EN

AO

HO

BO

SIGO

POI

SPRL

UK

WK

TAU1

ENTI

PI1

MASS

CFE

CZ

SKFE

SKZ

SUM

TFI

RESTRT

PNCH

EMI

EMIN

De scription

No. of points along shell meridian

Reference length (in.) ]

Reference thickness (in.) _ For luo_t casesReference Young's Modulus (p_ _i ,_e.tto _.. C_

Reference stress (psi)Pois son's ratio

Location of spring along meridian

Spring value in _ direction

Spring value in normal direction

Length of total time interval from zero

Total no. of time intervals from zero to TAUI

Print interval (will always print last interval)

Mass density Ibs. secZ/in 4

Coefficient of viscous damping at each station in

_direction

Coefficient of viscous damping in normal direction.

Spring constants of shell under elastic restraint in

_direction

Spring constant at each station in normal direction

Fourier summing increment (always -I.)

(Always -I)

0. for start from zero, I. for restart

0. no future restart; I. restart cards are punched

See description of top boundary cDnditions in Section 4. 6.

See description of bottom boundary conditions in

Section 4.6.

Last card must have a - sign in Col .umn I.

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4.5 Boundary Conditions

4. 5.1 Top Boundary

When the boundary conditions on the top boundary are of the following

kind, a special flag can be used to specify them:

free:

roller:

fixed: = u e = W =_E = 0) = 3.

simply supported: = u e = W = M E = 0) = 4.

complete: = _g = 0) = 5.

In these cases, DA(4440) = 1. El0, and DA(4441) is given the value

1., Z., 3., 4., or 5. as shown above. Other special boundary conditions

may also be specified. As an example, the full boundary (which is also given

above) can be specified as shown in the following data sheets.

A

¢Ng = u e = W = ME = 0) = Z.

A

(u_ = u e = F_

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x_ _ i!:!_i?_:!:i:i:!:!;i?_;_:i?i::i'i::::::i::::ii_

ft.

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0

P=l

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o

O_

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• C 0

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4. 5. Z Bottom Boundary

The same selection of boundary conditions is available here as for the

top boundary. This time, the indicator specifying the free, roller, fixed,

simply supportedj and complete conditions are set as follows:

DA (4476) = 1. El0

DA(4477) = 1., 2., 3., 4., 5.,

according to the bottnd_y condition desired. An example of Other possibleboundary conditions ia giveni_ the data Sheets below. The exampie here isthe free boundary (the same as in Section 4. 5.1), "

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°. .

L. i .-..= • • ....

, • i m | '_

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4

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0

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i L

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4:6

DECRD

Index

1

.2

3

4

8

9-208

209-409

Call DECRD (CDA)

Namer

GMI

EN

PFLAG

ZA1RCAXL

!

ROFF

PI_O

PHIN

EM

RIPT

XIPT

De s c riptioni .....

Geome_ indiCato r:

1. = cm_- Cylinder

Z. : S_=S- toroid

3. = genezal discrete point

4. : a l,b_az_:_%mctions

No. of station points

Print indicator; # 0., prints all data

For GMI = 1. ; radius at station 1

For Gh4I = 2.

For CdMI= I.

For GMI = Z.

For GMI = I.

revolution

For GMI = 2.

in degrees.For GMI = Z.

in degrees.For GMI = 3.

For GMI = 3.

For GMI = 3.

maximum)

; radius of curvature

; axial surface length; off-set distance to center of curvature

; angle between generator and axis of

; initial opening angle from vertical axis,

; final opening angle from vertical axis, _

; number of RI points given

; discrete radii (200 points maximum)

; discrete XI - arc length, (Z00 points '

The last card must have a - in Column 1.

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J.,.

4.7 Call DECR D (CDA)

The various tables are set up in this region as follows:

TAB (I) = No. Of stations given along meridian (i. e., stations

at, which value s change).TAB (Z) = Station, No. 1.

TAB_ (3) = Parana_er value at Station No. 1

T C4)=•Nextii,t t o, no.TAB(5} = Next partier value

.... .|" ,,/ . • .

[Stations and parameter values interlaced.

The last station must be the Nth station parameter value because

CODIMA interpolation routine will not extrapolate.

If +1.0 x 1010 is placed in TAB (1) the following parameter value is

constant (uniform over all stations EN) and its value is placed in TAB (Z).

4

29 -

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DECRD

Index

i _ I

2

4

5

6-41

Name

DTB

De s c ription

Extensional Rigidity

No. of stati6ns given, if = 1.El0, then a constant

_e_'tenStonal.lrigidity is given in 2' Stati6aNo. :[:"

ifCDA (:I) =r:1" _'_10, then this is a constant value of

e_tens ional: :rig idit y.

Val_ofextensional rigidity between Station I and nextstation

Station No. Z.

Value of extensional rigidity

Follows same pattern to DTB (20), value of last rigidity.

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y

DECRD

Index

42

43

44 !

45

46

47-81

83-125

124-164

165-205

206-246

247-287

288-328

329-369

370-410

452-492

493 -533

534-574

575-615

616-565

657-691

The last

EKTB

Follows

EITB

ALFTB

DNATB

TTB

ENTB

EMTB

PNTB

PFB TB

DZOTB

VZOTB

QZOTB

DFOTB

VFOTB

QFOTB

Flexural Rigidity

Delcription

No. of stations given, if = I. El0, then a constant flexural

_isidityis given in 43

Station.No. 1

" if CDA._4Z ) = 1. El0, then this is the constant vs_lue of

• ae 1.rig di - • .V__exural rigiditybe_ween station 1 and next

station

Station No. 2

V_lue of f!exural rigidity

same p_ttern to EKTB (ZO), value of last ridigity.

COntinueai above for the following quantities:

Young's ,modulus (E)

Coe£ft of thermal expansion (a)

I/Z shell thickness (h/Z)

Temperature gradient through shell (T)

Membrane thermal load

Bending thermal load

Normal pressure on shell (at reference surface)

Meridional surface pressure (at reference surface)

Initial displacement in normal direction.

Initial velocity in normal direction

Initial acceleration in normal direction

Initial displacement in g direction

Initial velocity in _ direction.

Initial acceleration in g direction.

card must have a - sign in Column 1.

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5.1 SAMPLE PROBLEM

To demonstrate the use of the computer program, and to illustrate

the format of the input and output data, the sample problem shown inFigure 2 has been calculated.

The problem concerns the vertical impact of a flexible body of

revoi_itibn_on0isti_g of a shallow spherical shell to which is rigidly attached

a heavier mass eo:_m_t_the_ur combined weight is 10,000 Ibs. The radius of

curvatuze of the_ shel_ middle surface is 175.6 ins., and the openin E angle is

19, 53°. ::, The shell _eXt6n_i_ and flexural stiffne S ses are both set equal to

3, 33 x l06 ibs/in. ,: Which c0r_esponds ton sandwich shell havin E 0.05 in.

steel facings and 1.9-5 in, honeycomb core. Other shell properties are asfollows: Ma,s per _it!s_e _rea = 9. 7 x 10'4 Ibs. sec. Z/in. _; Pois,on'sratio = 0. 33, and m_duius of elasticity E = 29. 7 x I06 psi. The initial impact

velocity is 30 fps. The hydrodynamic loads are computed on the basis of

the rigid-body theory ofVolume2 ofthis report, and are then applied as a

forcing function to the shell of revolution. A full discussion of the numerical

results obtained is given in Volume 2. Sample data sheets follow.

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b

//

/

tI

II

II

II

II

II

I

/I

I

V

IX

.6IN.

Fp

Figure Z. Model of Sample Problem.

- 34 °

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5, 2 Sarnple Input Data for a start from zero

In the present problem, we shall use a time interval of . 0001 seconds

and make a run to I. 0 milliseconds. Because it may, at some future date,

be desirable to make a restart at I. 0 ms. (to avoid recalculating the

response from zero), we shall punch some quantities on cards to make this

restart possible. They will be part of the input in the future restart. Thus

we set RESTRT = 0.0, and PUNCH= 1.0,

Sample input sheets are shown below for the start from zer ° .

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- 36 -

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- 37 -

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- 38 --

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C:, •

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S. 3 Sample Data for the Restart

In order to restart the problem at 1.0 ms., the following input is

required. Note that the time interval must be the same in all runs. The

changes in data are indicated by the arrows in the data sheets. Note

particularly that RESTRT = 1.0 here. The output cards obtained from the

previous run are placed at the end of the data deck. They are read insubroutine CDAFIT.

The output quantities will be identical to those from the start fromzero.

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5.4 Sample Output

The following pages show the output resulting from the start from

zero of the sample problem. Letters in circles correspond to descriptions

below.

®®©@@®®®©®®®®®®®®®®®

First Title Card

Second Title Card

Third Title Card

No. of Stations EN

Radius of curvature, ins.

Offset distance from center of curvature = 0

Closed apex, therefore PHIO initial opening angle is zero

PHIN, final opening angle is 19. 53 °

Station number

R(1), normal distance from shell to axis

W(THETA) nondirnensional curvature in 8 direction

W(XI) nondimensional curvature in _ direction

RHOX(1) R(1)/AO = P/AO

GAMMA (1) p '/p

DTB, the extensional rigidity (constant over shell)

EKTB, the flexural rigidity (constant over shell)

EITB, the Young's modulus (constant over shell)

ALFTB, thermal expansion coefficient (zero)

DNATB, I/Z shell thickness (constant over shell)

TTB, temperature gradient (zero)

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U

V

W

X

EN

AO

HO

EO

SIGO

ENFO

ENFL

POI

THETA

PIXI

SPRL

UK

VK

WK

EMK

TAUI

ENTI

PI 1

ENTB, membrane thermal load (zero)

EMTB, bending thermal load (zero)

All these other quantities, read by CDR, are set to zero.

See Sections 4.4 to 4.7 for descriptions

= number of stations

= reference length

= Reference thickness

= Reference Young's modulus

-_ Reference stress level

= always zero

= always zero

= l=)oisson's ratio

= always zero

= always zero

= location of spring along meridian

= spring value in _ direction

= always zero

= spring value in normal direction

= always zero

= total length of time from zero

= Total no. of time intervals from zero to TAUI

= point interval. Here PIl = i, and output is pointed at

end of enc interval

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TAU2

ENTZ

P12

TAU3

ENT3

PI3

=0

0

0

0

0

=0

(always zero)

MASS = mass density

CFE = coefficient of viscous damping at each station in direction

CZ = coefficient of viscous damping at each station in normal

direction

SKFE = spring constant of shell under elastic restraining in

direction

SUM =- 1. always

ENI

DEL

BCITP

BCIBM

Y

= I. , open shell; = 2., closed shell; set in GEOM

= distance between station points

= boundary condition indicator - top boundary

= boundary condition indicator - bottom boundary

Full Tables of

D

EK

E1

ALF

DNA

Extensional rigidity

Flexural rigidity

Young' s modulus

Coefficient of thermal expansion (zero here)

1

_- shell thickness

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T

ENT

EMT

®

®

®

@

®

I

U(1)

V(D

W(I)

M(PHI)

M(THETA)

M(PHI,

THETA)

Q(PHI)

temperature gradient through shell (zero here)

membrane thermal load (zero here}

bending thermal load {zero here)

Full Tables of PN, PFE, DZO, VZO, AZO, DFO, VFO,

AFO, all of which were read as zero in GDA. [See Section 4.7

for their descriptions I .

is self-explanatory. It shows the time (t), rmximum radius

of the pressure profile (c), and overall vehicle velocity (V).

Maximum pressure is given in BG, and depth submerged is

not computed here.

is a column showing the station number from the apex (1) to

the boundary (120).

is a column of the total pressure acting at each station point.

Because the maximum radius of the wetted surface is 3._ ins.,

and the distance between each station point (DEL, see _)is . 503 ins., the wetted surface only extends to station 8.

Beyond this station, no pressure is applied. Note that the

maximum pressure always occurs at the edge of the wettedsurface, in this case at station 8.

This page contains columns of response output. The columns

are as follows:

Station points along shell meridian

Tangential displacement (ins) of middle surface in _ direction

Tangential displacement of middle surface in @ direction.

Here zero because problem is axially symmetric.

Transverse displacement (ins.) of middle surface (positive

outward).

Meridional bending moment M% (in Ibs/in.)

Circumferential bending moment M@ (in ibs. /in. )

Twisting moment ME@. Zero here because problem is axiallysymmetric.

Shear force O_ (Ibs/in.)

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Q(THETA)

@1

N(PHI)

N(THETA)

N(PHI,

THETA)

SIG(PHI)

SIG

(THETA)

SIG(PHI,

THETA)

@VEL(U)

V L(Vl

VEL(W)

ACC(U)

ACC(V)

ACC(W)

Shear force Qe- Zero here because problem is axially

symmetric.

Additional columns of response.

Station point along meridian

Meridional membrane force N_ (Ibs/in.)

Circumferential membrane force N 8 (Ibs/in.)

Twisting force N_8. Zero here because problem is axiallysymmetric.

Stress_g (psi) on outer fiber of shell.

Stress °-8 (psi) on outer fiber of shell.

Stress _O on outer fiber of shell. Zero here because problem

is axisymmetric.

Additional columns of response.

Tangential velocity in _ direction (ins. /sec.)

Tangential velocity in 0 direction. Zero here because

problem is axially symmetric

Transverse velocity (ins sec.), positive in outward

direction.

Tangential acceleration in _ direction (ins. /sec Z)

Tangential acceleration in t9 direction (ins. /sec 2)

Transverse acceleration (ins. /secZ), positive in outward

direction.

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- 80 -

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O. 1 WARNINGS AND RECOMMENDATIONS7. 1 PRO(

0. 1. 1 Choice of Time Interw_l

The proper choice of the appropriate time interval zXt is important

for obtaining good results. If At is too large, the response will be highly

damped and inaccurate. On the other hand, ifA t is too small, the program

\\ill take a large amount of time to run. In the sample problemAt of 0. 05 ms

\vas used, which gave good results.

0. 1. 2 Number of Iterations

There is an unidentifiable bug in the problem which makes it necessary

that a restart be made after about 140 iterations through the shell program.

Should 160 iterations be exceeded, the program will "blow up." Therefore,

it is recommended that the job be run in segments of roughly 120 iterations

betxveen restarts. The method of restarting is explained in Sections 1. 3 and5.3.

o. 1. 3 DECRD

The subroutine DECRD is in the NAA program library and consequently

does not appear specifically in the source decks. In installations without

this program in their library, the subroutine should be inserted in the zero

link behind the subroutine MMY.

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7. 1 PROGRAM LISTING

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-134-

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