A Study on Elastoplastic Finite Element Study of Hydraulic Expansion of Lined Composite Pipe

doi:10.11885/j.issn.1674-5086.2020.05.08.03

Abstract

Abstract: Hydraulic expansion pressure is a key parameter that affect the forming quality of lined composite pipe. In this paper, based on the experimental data, multi-linear reinforced finite element models of two 316L liner materials are established; based on the Tresca yield criterion, we carried out research on the limit expansion pressure range, expansion pressure and tightness of the lined composite pipe in the process of hydraulic forming. The finite element results are compared with the analytical results. The results show that, when the forming conditions are satisfied, the selection of liner material with lower hardening strength can increase the expansion range and the tightness interval, which is conducive to the design of expansion pressure can be controlled. According to the calculation results, the relationship curve between the tightness and the expansion pressure under the forming condition is fitted, The minimum expansion values of the two materials are obtained to be 113.38 and 126.99 MPa respectively. The finite element model of material multi-linear strengthening established in this paper can accurately consider the strain strengthening process of liner material in the process of expansion joint and provide theoretical basis for the accurate control of the parameters of liquid expansion forming of lined composite pipe.

Key words: lined composite pipe, hydraulic expansion, multi-linear reinforced model, finite element method, tightness

CLC Number:

TE977

CHEN Junwen, LIAN Zhanghua, TANG Xiaoyong, GU Tianping, SHI Daiyan. A Study on Elastoplastic Finite Element Study of Hydraulic Expansion of Lined Composite Pipe[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(2): 159-167.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.05.08.03

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2022/V44/I2/159

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