A tensile test is performed on a metal specimen, and it is found that a true plastic

Question:

A tensile test is performed on a metal specimen, and it is found that a true plastic strain of 0.20 is produced when a true stress of 575MPa (83,500psi) is applied; for the same metal, the value of K in Equation 6.19 is 860MPa (125,000psi). Calculate the true strain that results from the application of a true stress of 600MPa (87,000psi).