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1 / 39Department of Mechanical Engineering, Ming Chi University of Technology

Computer-Aided Engineering

()

Chapter 5-2: Truss Elements in ANSYS (II)

Thomas Jin-Chee Liu

Department of Mechanical Engineering

Ming Chi University of Technology

Taishan, Taipei, Taiwan

Feb. 2009

2 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS

Plane truss

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3 / 39Department of Mechanical Engineering, Ming Chi University of Technology

:, 1999.-.:.

4 / 39Department of Mechanical Engineering, Ming Chi University of Technology

(cont.)

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5 / 39Department of Mechanical Engineering, Ming Chi University of Technology

(cont.)

4000

6 / 39Department of Mechanical Engineering, Ming Chi University of Technology

(cont.)

ANSYS,: (1), (2), (3), (4)

, (5)? (6).

: SI (m, N, kg).= 0.0009 m2, = 210

GPa.=300 MPa.

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7 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS

log file

8 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Utility Menu > File > Change Jobname >planetruss

GUI: Utility Menu > File > Change Title > Plane Truss

GUI: Main Menu > Preferences > Structural

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9 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > Preprocessor > Element Type > Add/Edit/Delete >Element Types

Add > Link 2D spar 1,OK >Element Types Close

1

10 / 39Department of Mechanical Engineering, Ming Chi University of Technology

Online help

ANSYS Element Reference

Element Library

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11 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > Preprocessor > Real Constants > Add/Edit/Delete >Real Constants

Add > Type 1 LINK1,Ok >Real Constant Set2

= 0.0009,OK >Real Constants Close

12 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > Preprocessor > Material Props > Material Models >Define Material

Model, Structural, Linear, Elastic, Isotropic2 > Linear

Isotropic EX= 210E9 PRXY=0

truss

Poissons ratio

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13 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI : Main Menu > Preprocessor > Modeling > Create > Nodes > In Active CS >

(),OK.

: NODE X Y Z

1 0.0000 0.0000 0.0000

2 10.000 0.0000 0.0000

3 10.000 10.000 0.0000

4 20.000 0.0000 0.0000

5 30.000 0.0000 0.0000

6 30.000 10.000 0.0000

7 40.000 0.0000 0.0000

14 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

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15 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI : Main Menu > Preprocessor > Modeling > Create > Elements > Elem attributes >

TYPE, MAT, REAL,OK.

16 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

GUI : Main Menu > Preprocessor > Modeling > Create > Elements > Auto Numbered > Thru

Nodes > 2,OK,.

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17 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

18 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

GUI: Utility Menu > Plot Ctrls > Numbering >

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19 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

20 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > Solution > Analysis Type > New Analysis

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21 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > Solution > Define Loads > Apply > Structural > Displacement > On

Nodes >

22 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

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23 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

24 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

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25 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > Solution > Define Loads > Apply > Structural > Force/Moment > On

Nodes >

26 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

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27 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: *.db

GUI: Utility Menu > File > Save as

planetruss.db

28 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > Solution > Solve > Current LS >

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29 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: GUI: Main Menu > General Postproc > Plot Results > Deformed Shape >

30 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > General Postproc > List Results > Reaction Solu >

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31 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS:

GUI: Main Menu > General Postproc > Element Table > Define Table >

32 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

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33 / 39Department of Mechanical Engineering, Ming Chi University of Technology

ANSYS: ()

GUI: Main Menu > General Postproc > Element Table > List Elem Table >

=300 MPa

=F/A

Pa

N

34 / 39Department of Mechanical Engineering, Ming Chi University of Technology

FEM

ANSYS ?

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35 / 39Department of Mechanical Engineering, Ming Chi University of Technology

Online help for Element Table

36 / 39Department of Mechanical Engineering, Ming Chi University of Technology

Online help for Element Table ()

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37 / 39Department of Mechanical Engineering, Ming Chi University of Technology

Files in working directory

38 / 39Department of Mechanical Engineering, Ming Chi University of Technology

Log file

GUI: Utility Menu > File > Read Input from > log file

CAE-Ch5-2-ex2-plane-truss.log

( )

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39 / 39Department of Mechanical Engineering, Ming Chi University of Technology

Unstable case

ok

unstable (r+m