Simulation of the Hertzian contact damage in ceramics
Simulation of the Hertzian contact damage in ceramics
复制标题
陶瓷中赫兹接触损伤的模拟
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
N. Huber
中科院分区：
文献类型：
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作者：
V. Licht;E. Ernst;N. Huber
陶瓷材料在接触载荷作用下的损伤机制主要有两种。在拉应力区存在裂纹不稳定扩展和材料破坏，而在压应力区存在微裂纹的形核和扩展。讨论了描述这种微裂纹场的有效材料行为的连续介质力学材料模型。对球形压痕试验的损伤行为进行了模拟。对模型的不同修正进行了检验，结果表明，损伤过程的剪应力依赖演化方程对实验测量结果的修正效果最佳。证实了压应力区微裂纹形核的基本思想。
Ceramic materials under contact loading are damaged by two main mechanisms. Unstable crack growth and material failure are found in tension stress regions, whereas nucleation and growth of microcracks occur in pressure stress regions. A continuum mechanics material model is discussed, which describes the effective material behaviour of such microcrack fields. Simulations of the damage behaviour are carried out for the spherical indentation test. Different modifications of the model are examined and it is shown that the best adjustment to experimental measurements is achieved with a shear stress-dependent evolution equation for the damage process. The basic ideas of the nucleation of microcracks in pressure stress regions could be confirmed.