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An evaluation of the stress intensity factor in functionally graded materials

机译：功能梯度材料中应力强度因子的评估

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Functionally graded materials (FGM) are characterised by variations in their material properties in terms of their geometry. They are often used as a coating for interfacial zones to protect the basic material against thermally or mechanically induced stresses. FGM can be also produced by technological process for example butt-welding of polymer pipes. This work is focused on a numerical estimation of the stress intensity factor for cracks propagating through FGM structure. The main difficulty of the FE model creation is the accurate description of continual changes in mechanical properties. An analysis of the FGM layer bonded from both sides with different homogenous materials was performed to study the influence of material property distribution. The thickness effect of the FGM layer is also discussed. All analyses are simulated as a 2D problem of an edge cracked specimen. In this paper, the above effects are quantified and conclusions concerning the applicability of the proposed model are discussed.
机译：功能梯度材料（FGM）的特征在于其材料特性在几何形状方面的变化。它们通常用作界面区域的涂层，以保护基础材料免受热或机械诱导的应力。 FGM也可以通过工艺过程生产，例如聚合物管的对接焊接。这项工作的重点是通过FGM结构传播的裂纹的应力强度因子的数值估计。有限元模型创建的主要困难是准确描述机械性能的连续变化。分析了用不同均质材料从两侧粘合的FGM层，以研究材料特性分布的影响。还讨论了FGM层的厚度效应。所有分析都被模拟为边缘裂纹样本的二维问题。本文对上述影响进行了量化，并讨论了有关所提模型适用性的结论。

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