首页|Numerical simulation of fracture behavior for the pipeline with girth weld under axial load
Numerical simulation of fracture behavior for the pipeline with girth weld under axial load
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NSTL
Elsevier
? 2022 Elsevier LtdThe failure accidents of the pipeline caused by girth weld problems occur frequently in recent years. However, the fracture mechanism and behavior of girth weld in pipeline are not clear at present. Accordingly, based on Gurson-Tvergaard-Needleman (GTN) damage model, a three-dimensional full-scale model of the X80 pipeline with girth weld was established in this paper, in which the differences of material properties in base, weld, and heat-affected zone (HAZ) were considered. Subsequently, the fracture process of the pipeline with girth weld under uniaxial tensile load was obtained. On this basis, the fracture behavior and the causes of failure of the pipeline were analyzed. The elongation and fracture strain were respectively defined to quantitatively describe the fracture toughness of the pipeline. The results showed that the crack initiated at the junction of the weld and HAZ in the inner wall of the pipeline due to material softening of HAZ, and then the crack propagated from the inner wall to the outer wall until forming a penetrated crack. Lastly, the crack grew rapidly along the circumferential direction, resulting in the overall failure of the pipe. Compared to the pipeline without weld, there was a smaller value of the elongation and fracture strain in the pipeline with girth weld. The elongation and fracture strain of the pipeline without weld was 26.49% and 0.78, and that of the pipeline with girth weld was 4.73% and 0.18, which was reduced by 82% and 77% respectively.
NSTL
Elsevier
