Evaluation the Effect of Residual Stress on Fracture of Polyethylene Pipe under Pressure Loading
Pages: 71 - 78
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Participants:
Haider Hadi Jasim |
Summary:
In this paper, the Weibull uni-axial and multi-axial distribution function for polyethylene pips under pressure loading were developed and analyzed taking into account residual stress. A tensile test was achieved to determine mechanical properties and the Weibull parameters. An experimental method using the hole-drilling strain-gage method was used to measure the residual stresses in PE pipe and compare them with that obtained from the numerical finite element method (FEM). The obtained results show that there is a convergence between uni-axial and multi-axial distribution functions, but the multi-axial distribution function gives large values compared to the uni-axial distribution function. It was observed that the residual stresses have an influence on the failure assessment diagram and cause translation from elastic-plastic failure to brittle failure.