Predict the three normal stress components when yielding occurs, using a)maximum distortion energy criterion (Mises); b) Maximum shear stress criterion (Tresca). You may use matlab to find principal stresses)

6. A torsion test performed on a specimen shows that plastic yielding occurs when the maximum shearing stress is 9MPa. Now a machine element made of the same material is subject to a stress state proportional to lo 6 5 | MPa l . (real stress state is a factor multiply the above matrix) Predict the three normal stress components when yielding occurs, using a)maximum distortion energy criterion (Mises); b) Maximum shear stress criterion (Tresca). You may use matlab to find principal stresses) 4 4 2 6 5