Problem : Human femur bone was subjected to a uniaxial tension test. As a result of a series of experiments, the stress - strain curve shown in Fig. 13.42 was obtained. Based on the graph in Fig. 13.42, determine the following parameters:
(a) Elastic modulus, E.
(b) Apparent yield strength, ay (use the offset method).
(c) Ultimate strength, au.
(d) Strain. t t, corresponding to yield stress.
(e) Strain, E2, corresponding to ultimate stress.
(f) Strain energy when stress is at the proportionality limit.