梯度涂层材料中裂纹问题的非均匀元分析
An analysis of a crack in functionally gradient coatings by inhomogeneous finite element
查看参考文献9篇
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文摘
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本文采用非均匀等参有限元的方法研究了薄膜梯度涂层/均匀基材中的界面裂纹问题，并与双材料界面裂纹情况进行了对比计算。研究表明：在均匀基材上采用梯度涂层，与双材料相比可以有效地降低裂尖场应力强度因子；同时还分析了涂层厚度与梯度参数对界面应力强度因子的影响。结果表明：当薄膜厚度大于或等于裂纹长度时，应力强度因子（K_I、K_(II)）对其尺度的变化显得不敏感；对梯度参数的影响而言，当材料性能曲线的幂指数m大于1时，裂尖场的应力强度因子K_(II)相对K_I很小且基本不随m变化，因此裂尖场与均匀材料情况类似；当m小于1时，应用强度因子K_(II)随m减小而急剧增大，裂尖场由K_I及K_(II)控制，断裂趋于混合型。 |
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其他语种文摘
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In the paper, an inhomogeneous isoparametric finite element method is employed to investigate an interfacial crack between the gradient coatings and homogeneous substrate, as well as that of bimaterials for comparison. It turns out that the stress intensity factors (SIFs) can be effectively reduced in the gradient coatings than in bimaterials. In addition, the influences of coatings' thickness and gradient parameter on the SIFs are also studied in detail. The results indicate that when the thickness of coatings is greater or equal to the length of crack, the SIFs are insensitive to the variation of coatings' thickness. Concerning the influence of the gradient parameter, for the power index m > 1, the SIF K_(II), which is very small as compared to K_I, keeps virtually unchanged with variation of m, and the field near the crack-tip is similar to that of homogeneous materials. Whereas for m < 1, the SIF K_(II) is sharply increased with the decrease of m, and the crack-tip field is obviously governed by K_I and K_(II), suggesting that the fracture is mixed mode. |
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来源
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工程力学
,2002,19(4):118-122 【核心库】
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关键词
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非均匀等参元
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功能梯度材料
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界面裂纹
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应力强度因子
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地址
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中科院力学所, 北京, 100080
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4750 |
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学科
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力学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:994822
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参考文献 共
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