Abstract
The present study presents an inverse analysis technique to determine the yield stress on the modified surface of metals. The method utilizes a depth-sensing instrumented indentation technique using a spherical indenter. Especially, a strategy of inverse analysis using finite element analyses has been established to determine the yield stress from the results of indentation tests. First, using a damage mechanics model, we revealed that the indentation load-depth curve is influenced by the degradation of Young's modulus, due to the damage effect at a highly-deformed plastic region under the tip of the indenter. Therefore, we present the method to evaluate the yield stress on the modified surface, excluding the damage effect. We applied the method to evaluate the yield stress of SUS 316L modified by cavitation peening.
