Q1. If the yield stress (oy) of a material is 375MPa, determine whether yield is predicted for the stresses acting on both the elements shown below using: P=-215 RF 330 (a) Tresca Criterion (b) Von Mises Criterion Element A Q = 200 Element B Note: your values for P (vertical load on Element A) should be negative (i.e. corresponding to a compressive vertical load). s=90

The stresses on the surface of a hard bronze component are shown in the figure below. The yield strength of the bronze is σY = 345 MPa.a) What is the factor of safety predicted by the maximum-shear-stress theory of failure for the stress state shown? Does the component fail according to this theory?b) What is the value of the Mises equivalent stress for the given state of plane stress?c) What is the factor of safety predicted by the failure criterion of the maximum-distortion energy theory of failure? Does the component fail according to this theory?

3) Referring to the plot below, a steel bar with a radius of 0.2523-inch exposes to 650°C. If the expected lifetime of the iron bar is 9 years, what is the maximum load allowed to carry? ( Stress (psi) 20,000 10,000 8,000 6,000 4,000 2,000- 1,000 30 32 34 36 38 40 42 (36+0.78 In s) Larson-Miller parameter w 1000

Q1B