Ductile fracture of two-dimensional cellular structures – Dedicated to Prof. Dr.-Ing. D. Gross on the occasion of his 60th birthday
Ductile fracture of two-dimensional cellular structures – Dedicated to Prof. Dr.-Ing. D. Gross on the occasion of his 60th birthday
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二维细胞结构的延性断裂——献给 D. Gross 教授 60 岁生日
DOI：
10.1023/a:1012248030212
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发表时间：
2001
影响因子：
2.5
通讯作者：
N. Fleck
中科院分区：
文献类型：
--
作者：
I. Schmidt;N. Fleck
裂纹扩展的启动和随后的阻力扩展进行了探讨数值规则和不规则的六角形蜂窝结构制成的韧性细胞壁。单元壁的弹塑性响应由双线性单轴应力-应变法描述，单元壁的断裂特征在于每单位面积的断裂能。宏观韧性和相关的塑性区形状的估计来自分析的基础上简单的考虑。裂纹扩展的数值模拟的有限元模型内的断裂单元和K-阻力曲线的小规模屈服的假设下计算。裂纹扩展行为的细胞壁材料参数和几何缺陷的结构上的依赖性进行了研究。
Crack growth initiation and subsequent resistance to propagation are explored numerically for regular and irregular hexagonal honeycomb structures made from ductile cell walls. The elasto-plastic response of the cell walls is described by a bilinear uniaxial stress-strain law, with fracture of the cell walls characterised by the fracture energy per unit area. Estimates for the macroscopic toughness and the associated plastic zone shape are derived analytically on the basis of simple considerations. Crack propagation is simulated numerically by fracturing elements within a finite element model and K-resistance curves are calculated under the assumption of small-scale yielding. The dependence of the crack growth behaviour upon the cell wall material parameters and geometric imperfections of the structure is investigated.