CRSS予測システムの構築と改良

抄録

Critical resolved shear stress (CRSS) determines the ease of slip deformation of metals and the values are different among slip systems. The CRSS ratio among slip systems is an important factor governing the plastic deformation mechanism. Thus, estimation methods for easily evaluating the CRSS ratio will play an important role to understand the deformation mechanisms. While our laboratory has developed a prediction system for CRSS ratios, it has not been sufficiently verified. In this study, the accuracy of the CRSS ratio prediction system was verified using sets of crystal orientations, CRSS ratios, and strain distributions estimated by crystal plasticity analysis. The results showed that when two or more slip systems were active, the CRSS ratios were successfully predicted. However, we found that prediction accuracy decreased under the following three conditions: only one slip system was dominantly active, multiple slip systems were active in the same area, and the distributions of the Schmid factors were similar among the slip systems. Methods to improve the accuracy of their predictions were also discussed.