Variational phase-field fracture with controlled nucleation

被引:4
|
作者
Larsen, Christopher J. [1 ]
机构
[1] Worcester Polytech Inst, Dept Math Sci, 100 Inst Rd, Worcester, MA 01609 USA
基金
美国国家科学基金会;
关键词
Variational fracture; Phase-field models; Crack nucleation; APPROXIMATION;
D O I
10.1016/j.mechrescom.2023.104059
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
We briefly review the Gamma-convergence of phase-field fracture to Griffith fracture, and describe how softening and nucleation occur when implementing phase-field models. An example is given of how this softening and nucleation can be completely stopped, while preserving crack growth and Gamma-convergence. We then show how nucleation can locally be turned back on, based on any criterion, such as a stress threshold. Again, these modifications preserve Gamma-convergence, and they can be applied to static, quasi-static, and dynamic models. Additionally, we describe why these modifications can be expected to improve the convergence of phase-field models.
引用
收藏
页数:4
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