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基于已建立的单晶体塑性模型,建立了耦合孪生的孪生诱发塑性(TWIP)钢多晶体塑性模型,该模型采用有限元多晶均匀化处理相邻晶粒间的几何协调和应力平衡条件,获得了单晶体与多晶体状态变量的关系,开发了基于ABAQUS/UMAT的计算程序.采用EBSD研究了TWIP钢拉伸应变分别为0.27和0.6时的织构变化,并对模型进行了应力应变及织构演化的验证.用该本构模型分别建立了拉伸、压缩和扭转3种简单加载条件下的有限元模型,分析了不同变形条件下的宏观力学响应及织构演化规律.结果表明:拉伸变形过程中,应变硬化现象和织构密度水平随应变增加而增强;在压缩过程中,织构类型随应变增加而发生变化,但是织构密度水平基本不变;而在扭转过程中,当扭转应变较小时,基本无织构形成,随着应变增加,织构逐渐显现出来,这是因为变形较小时,圆柱沿径向方向内部变形量较小,故织构不明显.
Based on the established single-crystal plasticity model, a dual-plastic twinned plastic model of TWIP steel was established. The finite element poly-homogenization was used to deal with the geometric coordination and stress equilibrium between adjacent grains. Single crystal and polycrystal state variables, the calculation program based on ABAQUS / UMAT was developed.The texture change of TWIP steel with tensile strain of 0.27 and 0.6 respectively was studied by EBSD, and the stress strain and texture evolution The constitutive models were used to establish three kinds of finite element models under the simple loading conditions of tension, compression and torsion respectively, and the macroscopic mechanical responses and the evolution of texture under different deformation conditions were analyzed.The results show that the tensile deformation During the process of compression, the strain hardening and the density of texture increased with the increase of strain. During compression, the type of texture changed with the increase of strain, but the density of texture did not change. In the process of torsion, When it is small, the texture is basically no texture. As the strain increases, the texture gradually appears. This is because when the distortion is small, the internal deformation of the cylinder in the radial direction is small, Structure is not obvious.