Lab #5 Due Today Individual Data Processing and

Individual Write Up Lab #5 Report is due TODAY by

midnight Answer Multiple Choice Questions

ONLINE TODAY by midnight Answer Student Survey ONLINE TODAY

by midnight Submit the Lab Report #5 in the drawer

labeled “MECE – 204: Strength Lab” beneath the M. E. Mail Folders

Lab #5 Report due Today

Cover Page + Abstract Data Sheet Spreadsheet Plot #1: h versus W Plot #2: Gradient vs. a2

Material Property Tables (two tables) Comments and Conclusions

Combined Loading Test Review Poisson’s Ratio, Bending,

Torsion Superposition Principle in

Combined Loading Strain Rosette and Equations Strains from Stresses Principal Stresses and Maximum

In-plane Shear Stress

Review Poisson’s Ratio

Poisson’s Contraction

Review Bending

Consider the top surface:

Longitudinal Contraction

Therefore, Transverse Expansion

Bending Stress and Strains

z = -x

Deformation in Torsion Two torques are

applied Circles remain

circles Longitudinal lines

become twisted All angles are

equal End x-section

remains flat

Shear Strain in Torsion

Before After

Shear Stress & Torque

Combined Loading

Both Bending & Torsion

Stresses and Strains

Bending Torsion Round x-section

x = FLbendc/I xz = FLarmc/J c = D/2

x = x /E xz = xz /G I = D4/64

z = - x G = E/(2+2) J = 2 I

Stress State under Strain Gage

45 Strain Rosette &Strain Transformations

In our case:

Gage B is aligned along x (axial direction)

Substitute = -45, 0, +45 for A, B, C gages

And solve for the three strains:

Mohr’s Circle &Stress Transformations

Conduct the Combined Loading Test

Please initialize the Strain Meter a couple of times to ensure that it indicates zero strains at zero load, and that there is NO DRIFT with time

Bending Only (Equations)

M = F * Lbend

x = FLbendc/I

c = D/2

I = D4/64

Bending Only (Spreadsheet)

Elastic Modulus

Poisson’s Ratio

Properties (Bending Only)

Combined Loading(Stress Analysis)

x = F * Lbend * c/I

z = 0

xz = F * Larm * c/J

Stress Analysis (Spreadsheet)

Strain Analysis (Equations)

x = x / E

z = - * x

xz = xz / G

Strain Analysis (Spreadsheet)

Longitudinal Strain (Plot)

Transverse Strain (Plot)

Shear Strain (Plot)

Lab #5 Due Today Individual Data Processing and

Individual Write Up Lab #5 Report is due TODAY by

midnight Answer Multiple Choice Questions

ONLINE TODAY by midnight Answer Student Survey ONLINE TODAY

by midnight Submit the Lab Report #5 in the drawer

labeled “MECE – 204: Strength Lab” beneath the M. E. Mail Folders