【摘要】 对Gurson本构方程作了初步的研究,并对圆柱光滑拉伸试件在颈缩阶段用Gurson本构方程做了大应变弹塑性有限元分析。讨论了颈缩区空穴形核、扩张、静水应力以及材料软化的问题,初步揭示了空穴的演化过程和材料的破坏机理。有限元分析的结果表明,颈缩阶段空穴长大聚合机理非常显著,而形核作用相对较弱。更多还原

【Abstract】 The Gurson’s constitutive model is investigated. Based on Gurson’s constitutive model and large elastic\|plastic deformation, necking behavior of a round tensile bar is analyzed numerically. The void nucleation, growth, hydrostatic tension and material softening are discussed in the neck region. From the numerical results, it indicates that the developments of void and damage mechanism of material are revealed.更多还原