Unformatted text preview: • Determine Y, K, and n. 2.- Take a cubic piece of metal with a side length lo and deform it plastically to the shape of a rectangular parallelepiped of dimensions l1, l2, and l3. Assuming that the material is rigid and perfectly plastic, show that the volume constancy requires that the following expression be satisfied: ε 1 + ε 2 + ε 3 = 0 3.- A metal is yielding plastically under the stress state shown in the figure. a) Label the principal axes according to their proper numerical convention. b) What is the yield stress using the Tresca criterion? c) What if the von Mises criterion is used? d) The stress state causes measured strains of ε 1 =0.4, and ε 2 =0.1. What is the value of ε 3 ?...
View Full Document
- Spring '08
- Yield surface, 3rd millennium, Honor Code pledge, stress-true strain curve, aluminum tension-test specimen