衬里复合管液压胀接力的弹塑性有限元研究

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

陈俊文 练章华 汤晓勇 谷天平 施岱艳

CHENJunwen LIANZhanghua TANGXiaoyong GUTianping SHIDaiyan

中国石油工程建设有限公司西南分公司, 四川 成都 610041 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川 成都 610500

China Petroleum Engineering & Construction Corp., Southwest Company, Chengdu, Sichuan 610041, China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

液压胀接力是影响衬里复合管液压成型质量的关键参数。根据实验数据建立了两种316L衬管材料的多线性强化的有限元模型，基于Tresca屈服准则，开展了衬里复合管在液压成型过程中极限胀接压力范围、胀接压力与紧密度关系的研究，并将有限元计算结果和解析解计算结果进行了对比。结果表明，当满足成型条件时，选择硬化强度较低的衬管材料，可以增大胀接力范围和紧密度区间，有利于制管胀接力的设计和控制；根据计算结果拟合了该成型条件下紧密度和胀接力的关系曲线，得出了两种材料的最小胀接力值分别为113.38 MPa和126.99 MPa。建立的材料多线性强化有限元模型可以准确地考虑衬管材料在胀接过程中的应变强化过程，为精确控制衬里复合管液胀成型参数提供了理论依据。

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.

10.11885/j.issn.1674-5086.2020.05.08.03