Deformation (meteorology)

Algorithm

Residual

Linguistics

Engineering

Philosophy

Residual stress

Materials science

Stress (linguistics)

Leak

Structural integrity

Computer science

Mechanical engineering

Environmental engineering

Finite element method

Residual strength

Internal pressure

Composite material

Pipeline transport

Structural engineering

AIP conference proceedings

The mechanical damages created on buried pipelines by any external activities are important consideration to assess the structural integrity of pipelines. The damages could be in the form of corrosion, dent, crack, gouge or any combination of these. A dent is a permanent inward plastic deformation in the pipe wall. The dents may not immediately cause failure of the pipe. However, it can reduce the pipe's structural capacity and cause rupture or leak in the long run. The current researches focus on studying the behavior of dented pipe with respect to burst strength and fatigue life considering initial deformed shape. However, the effects of residual stresses formed during the formation of a dent on the performance of dented pipe are not extensively studied yet. In this study, finite-element modelling is used to understand the importance of residual stresses on the integrity assessment of dented pipe. The analysis results revealed that both residual stresses and stress history have significant effects on the structural capacity of dented pipes under internal pressure and axial loads.

Nonlinear finite element analysis of dented pipes under internal pressure and axial loads