Use of dynamic stress-strain characteristic in the prediction of stainless and carbon steel pipe response

Abstract

A theoretical study of uncracked pipes in bending under dynamic conditions is presented. The pipes evaluated are a 6 in. carbon steel and an 8 in. stainless steel. The effect of the dynamic loads is to increase the yield stress and the flow stress of the material. The analysis performed in the study has been done using a finite element computer code. The failure mode considered was by plastic collapse at the moment in which the outer fiber of the pipe reached the flow stress. The code has been validated against a test run on a stainless steel pipe. The Net Section Collapse Load (NSCL) criterion has also been considered for comparison with the code results. The results indicate that if the failure mode is by plastic deformation the pipes should respond to the dynamic action of the loads about 10% better than to the static ones.