Three Dimensional Modeling of Inclined Surface Cracks in FGM Coatings

机译：FGM涂层倾斜表面裂纹的三维建模

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This study presents a three dimensional finite element method for mixed-mode fracture analysis of an FGM coating-bond coat-substrate structure. The FGM coating is assumed to contain an inclined semi-elliptical crack at the free surface. The trilayer structure is examined under the effect of transient thermal stresses. Strain singularity around the crack front is simulated by utilizing collapsed wedge-shaped singular elements. The modes I, II and III stress intensity factors are computed by applying the displacement correlation technique and presented as a function of time. Four different FGM coating types are examined in the parametric analyses which are metal-rich, ceramic-rich, linear variation and homogeneous coatings. The results provided illustrate the influences of the FGM coating type and crack inclination angle on the transient behavior of the mixed-mode stress intensity factors.

机译：本研究提出了一种三维有限元方法，用于FGM涂层粘结涂层-基底结构的混合模式断裂分析。假定FGM涂层在自由表面上包含倾斜的半椭圆形裂纹。在瞬态热应力的作用下检查了三层结构。利用塌陷的楔形奇异元素模拟了裂纹前沿周围的应变奇异性。通过应用位移相关技术计算模式I，II和III应力强度因子，并将其表示为时间的函数。在参数分析中检查了四种不同的FGM涂层类型：富金属，富陶瓷，线性变化和均质涂层。提供的结果说明了FGM涂层类型和裂纹倾斜角度对混合模式应力强度因子的瞬态行为的影响。

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来源
《Multiscale, multifunctional and functionally graded materials》|2008年|P.109-114|共6页
会议地点 Sendai(JP)
作者
S. Kosker; rnS. Dag; rnB. Yildirim;
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作者单位

Department of Mechanical Engineering, Middle East Technical University, Ankara 06531, Turkey;

rnDepartment of Mechanical Engineering, Middle East Technical University, Ankara 06531, Turkey;

rnDepartment of Mechanical Engineering, Hacettepe University, Ankara 06800, Turkey;

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原文格式 PDF
正文语种 eng
中图分类工程材料一般性问题;
关键词
functionally graded materials (FGMs); semi-elliptical surface crack; finite element method; displacement correlation technique; thermal stresses;

机译：功能分级材料（FGM）；半椭圆形表面裂纹；有限元法位移相关技术热应力;

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Three Dimensional Modeling of Inclined Surface Cracks in FGM Coatings

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