Q1.

Consider the plot shown in Figure 1. If the proportionality limit occurs at an engineering strain of 0.1 (10%) and a stress of 100MPa, what is the modulus of resilience, or the total energy that can be stored elastically, prior to permanent stretching?

Q2.

Consider again the plot shown in Figure 1. If the ultimate tensile strength is 200MPa and the sample breaks (right terminus of the curve) at a strain of 0.5 (50%), estimate the modulus of toughness, or the total energy that can be absorbed or dissipated, prior to fracture?