Extracted text: 5. A plane stress state is given by ơ1 =-3 0o, 02 = 2 and 112 = 00 The yield stress for this material is Oy. Assume now that the governing stress o, is increased monotonically. 5.1. At what value of o, will yielding occur according to Tresca's criterion? 5.2. At what value of o, will yielding occur according to Von Mises' criterion? 5.3. Which is the more conservative and by how much (%)?