Extension of the gurson model accounting for the void size effect

• 来源期刊: 力学学报（英文版）
• 年，卷（期）: 2005,（2）
• 页码范围: 142-150
• 页数: 9页
• 语种: 英文

摘要

A continuum model of solids with cylindrical microvoids is proposed based on the Taylor dislocation model.The model is an extension of Gurson model in the sense that the void size effect is accounted for. Beside the void volume fraction f, the intrinsic material length l becomes a parameter representing voids since the void size comes into play in the Gurson model. Approximate yield functions in analytic forms are suggested for both solids with cylindrical microvoids and with spherical microvoids. The application to uniaxial tension curves shows a precise agreement between the approximate analytic yield function and the "exact" parametric form of integrals.