Computational analysis of thin coating layer failure using a cohesive model and gradient plasticity
Computational analysis of thin coating layer failure using a cohesive model and gradient plasticity
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DOI：
10.1016/s0013-7944(03)00132-2
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发表时间：
2003-09
影响因子：
5.4
通讯作者：
Huang Yuan;Jian Chen
中科院分区：
文献类型：
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作者：
Huang Yuan;Jian Chen
热障涂层 (TBC) 广泛用于防止瞬态高温攻击并赋予组件高耐用性。由于材料特性非常不均匀，TBC 失效通常发生在脆性氧化层和延性基材之间的界面附近。 TBC 失效的可靠预测需要有关裂纹尖端场和后续断裂准则的详细信息。在本文中，使用内聚模型和梯度塑性来模拟破坏过程并研究界面应力分布与特定断裂能的相互依赖性。计算证实这两个模型的组合能够模拟 TBC 系统中的不同故障机制。该计算模型有可能对裂纹扩展过程进行现实预测。
Thermal barrier coatings (TBC) are widely used to prevent transient high temperature attack and allow components high durability. Due to strong inhomogeneous material properties the TBC failure often initiates near the interface between the brittle oxide layer and the ductile substrate. A reliable prediction of the TBC failure requires detailed information about the crack tip field and the consequent fracture criteria. In the present paper both cohesive model and gradient plasticity are used to simulate the failure process and to study interdependence of the interface stress distribution with the specific fracture energies. Computations confirm that combination of the two models is able to simulate different failure mechanisms in the TBC system. The computational model has the potential to give a realistic prediction of the crack propagation process.