【摘要】 本文利用Eulerian坐标系下弹塑性大变形基本公式及分叉屈曲的理论,采用有限元数值法,探索平面应变条件下具有幂硬化弹塑性材料,在不同位移加载参数及不同原始孔洞体积百分数下,材料内部空洞的长大、剪切分叉以及材料宏观力学行为.计算结果表明,宏观材料的软化、塑性可膨胀性、内部损伤的发展以及剪切分叉的临界应变值等,都与加载参数α、原始空洞尺度有着密切的关系.更多还原

【Abstract】 In this paper the overall behaviour of a material with voids and shear band bifurcation and the nonhomogeneous strain field are studied under the plane-strain condition. An analysis is made using the large deformation theory based on Eulerian coordinated system and incremental theory. In order to obtain the expected shear band bifurcation mode the boundary condition of the displacement and the loads for the model of the calculation must be restricted according to the condition given in this paper. The results of the numerical solution show that the overall behaviour of the material and the critical strain of the shear band bifurcation point are closely related to the size of the voids and the parameter a of controlled loading.更多还原