衬里复合管液压胀接力的弹塑性有限元研究

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,...

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

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.