Deformation and Fracture Behavior of Wall Thinned Carbon Steel Pipes

J. Ocean Eng. Technol. 2006;20(4):17-23.

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

School of Mechanical Engineering, Pukyong National University;Division of Materials Science and Engineering, Pukyong National University;

감육된 탄소강배관의 변형과 파괴거동

안석환;남기우;

부경대학교 기계공학부;부경대학교 신소재공학부;

Keywords: Wall thinning, Carbon steel pipe, Erosion/Corrosion, Finite element analysis, Bending load, Fracture behavior, Failure mode

핵심용어: 감육, 탄소강배관, 침식/부식, 유한요소해석, 굽힘하중, 파괴거동, 손상모드

Abstract

Monotonic four-point bending tests were conducted on straight pipe specimens, 102 mm in diameter with local wall thinning, in order to investigate the effects of the depth, shape, and location of wall thinning on the deformation and failure behavior of pipes. The local wall thinning simulated natural erosion/corrosion metal loss. The deformation and fracture behavior of the straight pipes with local wall thinning was compared with that of non wall-thinning pipes. The failure modes were classifiedas local buckling, ovalization, or crack initiation, depending on the depth, shape, and location of the local wall thinning. Three-dimensional elasto-plastic analyses were carried out using the finite element method. The deformation and failure behavior, simulated by finite element analyses, coincided with the experimental results.