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一、前言金属在塑性变形中,微观观察发现有不同种类的空穴和微裂纹的产生和发展这些现象引起材料微结构的损伤,其宏观观象是体积变化的不可恢复性。在金属中出现空穴将降低它乐受外载荷的能力,即将削弱材料的强度,在塑性成形的最终阶段出现变形局部化和塑性分裂,研究这些现象是很有意义的。这种分裂是不能实现所预期要达到的成形目的重要原因之一、因此,若要从理论上预见它的出现将具有重要意义。然而,由于缺乏考虑上述现象相应的
I. Introduction Metal in plastic deformation, microscopic observation found that there are different types of holes and micro-cracks in the development and development of these phenomena caused by damage to the material microstructure, the macroscopic phenomenon is the volume change of non-recoverability. The presence of holes in the metal reduces its ability to withstand external loads, is about to weaken the material strength, deformation and plastic deformation in the final stages of plastic deformation, the study of these phenomena is of great significance. This split is one of the important reasons why the desired shaping purpose can not be achieved. Therefore, it is of great significance to foresee its emergence theoretically. However, due to the lack of consideration of the above phenomenon