基于ABAQUS的Ti5553合金等径转角挤压过程有限元分析

Finite element analysis of Ti5553 alloy during equal channel angular extrusion based on ABAQUS

针对非等温条件下Ti5553合金等径转角挤压过程这一多因素影响的复杂问题,对不同的摩擦系数、挤压速度、挤压温度下,被挤压试样的应力大小和分布以及等效应变情况分别进行了研究,对Ti5553合金高温变形行为、有限元分析的关键技术、等径转角挤压的原理和方法进行了归纳,给出了Ti5553合金等径转角挤压过程有限元分析的模型参数,建立了等径转角挤压的三维模型,利用ABAQUS软件自带的点迹跟踪方法对不同摩擦系数、挤压速度和挤压温度下3个特征点的等效应变曲线的变化进行了跟踪。研究结果表明,试样在接近转角处时等效应变开始发生,并在转角处迅速增加到最大;随着摩擦系数、挤压速度的增加,等效应变发生时间均提前;P2点的等效应变受挤压温度和挤压速度的影响较大。

Aiming at equal channel angular extrusion process of Ti5553 alloy under non-isothermal condition affected by lots of complicated factors,the value and distribution of stress and equivalent strain of the specimen in different friction coefficient,extrusion speed and extrusion temperature were researched,and high temperature deformation of Ti5553 alloy,the key technical of finite element analysis and the principle and method of equal channel angular extrusion were summarized. The model parameters of finite element analysis of Ti5553 alloy during equal channel angular extrusion were provided,and the 3D model of ECAE was established. The variation of the equivalent strain curve of three feature points at various friction coefficients,extrusion speeds and extrusion temperatures was analyzed based on the particle tracking method of ABAQUS. The results indicate that the equivalent strain begins to occur when the specimen is near the corner,and rapidly increases to maximum at the corner. With the increase of friction coefficient and extrusion speed,the equivalent strains occur in advance. The equivalent strain of P2 is greatly impacted by extrusion temperature and extrusion speed.