Effect of Local Wall Thinned Location due to Erosion-Corrosion on Fracture Behavior of Pipes

J. Ocean Eng. Technol. 2007;21(1):51-58.

Ahn, Seok-Hwan;Seok, Kum-Cheol;Nam, Ki-Woo;

School of Mechanical Engineering, Pukyong National University;Department of UR Interdisciplinary Program of Mechanical Engineering Graduate School, Pukyong National University;Division of Materials Science and Engineering, Pukyong National University;

침식-부식에 의해 감육된 배관의 파손거동에 미치는 감육위치의 영향

안석환;석금철;남기우;

부경대학교 기계공학부;부경대학교 대학원 기계공학학연협동과정;부경대학교 신소재공학부;

Keywords: Fracture behavior, Erosion/Corrosion, Finite element analysis, Pipe, Inner wall thinning, Outer wall thinning, Local wall thinned location

핵심용어: 파손거동, 침식/부식, 유한요소해석, 배관, 내부감육, 외부감육, 국부감육위치

Abstract

This study on the effects of local wall-thinned location on the fracture behavior of pipes was carried out, and the results were compared with the analytical results. Local wall-thinning for the bending test was machined with various sizes on the outside of pipes, in order to simulate the metal loss, due to erosion/corrosion. In addition, we had carried out FE analysis for the pipes with local wall thinning on the inside, and its results were comparatively studied with that of the outside. Three-dimensional elasto-plastic analyses were able to accurately simulate fracture behaviors of inner or outer wall thinning. Fracture types, obtained from the experiments and analyses, could be classified into ovalization, local buckling and crack initiation, depending on the thinned length and thinned ratio. Based on the results, the fracture behaviors of pipes with the outer wall thinning can be applied to estimate the fracture behaviors of pipes with the inner wall thinning.