Stress categorization of three dimensional structures based on elastic follow-up concept; Stress categorization of plates with holes

kasahara, Naoto; not registered

It is difficult to categorize stress of three dimensional structures by evaluation section, since they have complicated stress distributions. Authors propose a stress categorization method based on the elastic follow-up concept where primary and secondary stress of general structures can be categorized by value of an elastic follow-up parameter and peak stress can be distinguished by change ratio of its value. In this study this method was applied to categorize stress at hole edges of plates with holes due to a monotonic membrane loading. The results reveals that the plates with larger holes have less ratio of peak stress and large elastic follow-up parameters, so that attention should be paid to their structural integrity. Further more, categorized stresses and nonlinear FEM were applied to evaluation of ratchet deformation at hole edges of plates with holes due to a primary membrane stress plus cyclic secondary bending stress. F.E. results clarified that ratchet is easy to occur on plates with larger holes. Its tendency can be predicted rationally by Bree diagram with the categorized stresses based on the elastic follow-up concept.