11.7 The indentation hardness, H, is given by H 30, where y is the true yield stress at a nominal plastic strain of 8%. If the true stress-strain curve of a material is given by CHAPTER 11 Continuum Aspects of Plastic Flow = An and n = 0.2, calculate the tensile strength of a material for which the indentation hardness is 600 MN m. You may assume that TS An". = Answer TS = 198 MN m -2