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首页> 外文期刊>Journal of thermal stresses >A SURFACE CRACK IN A GRADED COATING BONDED TO A HOMOGENEOUS SUBSTRATE UNDER THERMAL LOADING
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A SURFACE CRACK IN A GRADED COATING BONDED TO A HOMOGENEOUS SUBSTRATE UNDER THERMAL LOADING

机译:热载荷作用下粘结在均质基体上的梯度涂层中的表面裂纹

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The elastostatic problem of a surface crack in a graded coating bonded to a homogeneous substrate under steady-state heat flux is considered. The coating is graded along the thickness direction and modeled as a nonhomogeneous medium with an isotropic stress-strain law. The problem is solved under the assumption of plane strain or generalized plane stress conditions. The resulting crack problem is of mode 1 because the orientations of the crack axis, the material gradient and the heat-flux are all parallel. The equivalent crack surface tractions are first obtained and substituted in the plane elasticity equations which are then converted analytically into a singular integral equation. The resulting equation is solved numerically using orthogonal Jacobi polynomials to yield the Mode I stress intensity factor. The main objective of the article is to study the effect of the layer thickness and nonhomogeneity parameters on the crack tip stress intensity factor for the purpose of gaining better understanding on the behavior of graded coatings under thermal loading.
机译:考虑在稳态热通量下粘结到均质基材上的渐变涂层中表面裂纹的弹性静力学问题。涂层沿厚度方向分级,并建模为具有各向同性应力应变定律的非均匀介质。该问题在平面应变或广义平面应力条件下得到解决。产生的裂纹问题属于模式1,因为裂纹轴,材料梯度和热通量的方向都平行。首先获得等效的裂纹表面牵引力,并将其代入平面弹性方程中,然后将其解析地转换为奇异积分方程。使用正交Jacobi多项式对所得方程进行数值求解,以得出模式I应力强度因子。本文的主要目的是研究层厚度和非均匀性参数对裂纹尖端应力强度因子的影响,以便更好地了解热负荷下梯度涂层的性能。

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