Vol. 7 є 2, 2017 p 66-71

Pages

Article name, authors, abstract and keyword

66-71

Mechanical behavior of the pipe squeezed by other object based on numerical simulation

Jie Zhang a, Han Zhang a

a School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan, 610500, China

https://doi.org/10.28999/2541-9595-2017-7-2-66-71

Abstract: Mechanical damage of the pipe squeezed by other object is one of the important failure modes for oil and gas pipes. Mechanical behavior of a pipe squeezed by other objects was investigated by numerical simulation. Effects of initial indentation depth and diameter-thick ratio on the mechanical behavior of the dented pipe were studied. The results show that the squeezing force, high stress area and the maximum stress increase in the uploading process. In the unloading process, there is a great change for the stress distribution, and elastic deformation recovery occurs in this process. Crosssection of the middle plane is flatted. The deformation of the pipe in the vertical plane is V-shape. In the former stage, the maximum equivalent plastic strain appears on the center part of the pipe. There are two maximum equivalent plastic strain areas with the increasing of the objectТs displacement. In the unloading process, the equivalent plastic strain increase. With the increasing of the initial indentation depth, the resilient rate of the pipe dent decreases, but maximum equivalent plastic strain increases. With the increasing of the diameterthick ratio, the resilient rate increases but the maximum equivalent plastic strain decreases.

Keywords: pipe, numerical simulation, plastic deformation, stress, resilient rate

References:
[1] Jie Z, Zheng L, Chuanjun H, et al. Buckling behaviour analysis of a buried steel pipeline in rock stratum impacted by a rockfall. Engineering failure analysis, 2015,58:281Ц294.
[2] Furnes O, Amdahl J. Ship collision with offshore platforms. Intermaritec 80;1980.
[3] Ellinas CP, Walker AC. Damage on offshore tubular bracing members. Proc Int Assoc Bridge Struct Eng 1983.
[4] Wierzbicki T, Suh MS. Indentation of tubes under combined locading. Int J Mech Sci 1983;30:229Ц248.
[5] Chen K, Shen WQ. Further experimental study on the failure of fully clamped steel pipes. Int J Impact Eng 1998,28(3):177Ц202.
[6] Ruggieri C, Ferrari Jr JA. Structural behavior of dented tubular members under lateral loads. J Offshore Mech Arct Eng, 2004,126.
[7] Lu G. A study of the crushing of tubes by two indenters. Int J Mech Sci 1993;35:267Ц278.
[8] Firouzsalari SE, Showkati H. Thorough investigation of continuously supported pipelines under combined pre-compression and denting loads. International Journal of Pressure Vessels and Piping, 2013,04:83Ц95.
[9] Andrew Cosham, Phil Hopkins. The effect of dents in pipelinesguidance in the pipeline defect assessment manual. International Journal of Pressure Vessels and Piping, 2004,81:127Ц139.
[10] Jie Zhang, Zheng Liang, Chuanjun Han. Buckling behavior analysis of buried gas pipeline under strike-slip fault displacement [J]. Journal of Natural Gas Science and Engineering, 2014, 21:921Ц928.

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