Name: ____________________________________________________
Lab Section Day: __________ Time: ___________ Group: __________
Lab 05 – Torsion and Shear
Pre-Lab Assignment - AAE 20401
Read the Lecture 05 and the Lab Manual Pages 37-47, and answer the
following questions:
1 – What is the overall purpose of this laboratory practice?
This experiment is designed to examine shafts subjected to torsion and placed under simple shear.
The results are based on the hypothesis of simple shear and measurements based on hollow shafts.
2 – Give three examples of aerospace components subjected to torque or simple shear.
Helicopter rotors, gear boxes, turbofan shafts.
3 – Consider a cylinder subjected to pure torque. What are the expected values for the axial and
hoop strains? Knowing that a strain gage can measure only normal strain, sketch a Mohr circle to
explain the direction you would install a strain gage to indicate shear strain. Relate the shear
strain (𝛾) with the angle of twist (𝜙) and the shaft dimensions.
Axial and hoop strain is expected to be zero. Place the stain gauge in the +- 45 degree angle to
the x axis of the shaft
4 – Consider Figs. 5.9 and 5.10 in the Lab Manual as reference. Use static equilibrium to
integrate and determine the shear stress in the plate as a function of y.
