Bending capacity of locally deformed line pipes

Abstract

This paper discusses the effects of local deformation, dent, of a line pipe. Bending tests were conducted using one normal pipe and two dented pipes with an outside diameter of 200mm. One dented pipe was bent in the direction that the dent was caved inside the pipe, another was bent in the direction that was parallel with the surface of the dent. All pipe were not broken. A series of finite element analyses were conducted to investigate the bending behaviors. Two kind of analyses were conducted, one was considering only the dent shape, another was considering the dent shape and the residual strain. The analysis considering the dent shape and the residual strain could reproduce the result of bending tests.