Figure 3: (Lt) A structural member in its stress-free state is square. (Right) T
ID: 2074631 • Letter: F
Question
Figure 3: (Lt) A structural member in its stress-free state is square. (Right) The member is deformed into a parallelogram and arrows show the new orientation of the original z y axes. Use this Figure for Problem 3 3. (6.6 pts.) For the deformed state of the originally square member in Figure 3, find an expression for the average shear strain, with respect to the original yaxes (b) (),v = (i) none of the above (MPa) 30 20 10 0.01 0.02 0.03 0.04 0.05 Figure 4: Stress strain curve for a metal. Use this Figure for Problem 4 (6.6 pts.) Find the best estimate for the recovered strain, reeod in a tensile test specimen of a metal with stress strain curve in Figure 4 after removing a load that resulted in a maximum normal stress of 30 MPa. Assume the yield stress is ', 2011 Pa (a) Erecovred 0.035 (b)Ereovred 0.020 (c) €recovered :0.025 d)r005 (e)reered 0.045 ()E0.010 ()recoeeed 0.030 (h) recoered0.040 (i)-recovered 0.015Explanation / Answer
answers :
3) f ; The engineering shear strain is defined as the sum of the angles deflected from both the axes i.e, (theta +theta )
4) d ; The recovery of strain is possible only if the stress applied is within elastic limit. If it is beyond this there will be permanent set.
Thank you.