Singular stress field near the edge of interface of bonded dissimilar materials with an interlayer
Singular stress field near the edge of interface of bonded dissimilar materials with an interlayer
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DOI：
10.1016/j.ijsolstr.2007.02.024
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发表时间：
2007-09
影响因子：
3.6
通讯作者：
S. Ioka;K. Masuda;S. Kubo
中科院分区：
文献类型：
--
作者：
S. Ioka;K. Masuda;S. Kubo
对于粘接异种材料，自由边应力奇异性通常出现在自由面与界面的交点附近。当使用粘合剂粘合两种材料时，在两种粘合材料之间形成夹层。当陶瓷和金属结合时，由于热膨胀系数的不同而产生残余应力。可以在两种材料之间插入中间层以消除残余应力。界面与自由表面相交处的应力场对评价不同材料的结合强度是非常重要的。本文采用边界元法计算了含中间层的异种材料粘接界面的应力分布，探讨了中间层对界面应力分布的影响。通过数值计算，研究了有无中间层时，不同材料界面自由边奇异应力场之间的关系。结果表明，当中间层很薄时，中间层对应力分布的影响仅限于界面与自由表面相交处附近的中间层厚度量级的小范围内。界面与自由面相交处的应力分布受无中间层异种材料界面自由边应力奇异性的控制。在这种情况下，夹层可以被称为自由边缘奇异性控制夹层。如果对于一个夹层厚度h，界面上的应力分布是已知的，则可以估计对于其他h值的界面上的应力分布。
For bonded dissimilar materials, the free-edge stress singularity usually prevails near the intersection of the free-surface and the interface. When two materials are bonded by using an adhesive, an interlayer develops between the two bonded materials. When a ceramic and a metal are bonded, the residual stress develops because of difference in the coefficient of thermal expansion. An interlayer may be inserted between the two materials to defuse the residual stress. Stress field near the intersection of the interface and free-surface in the presence of the interlayer is then very important for evaluating the strength of bonded dissimilar materials. In this study, stress distributions on the interface of bonded dissimilar materials with an interlayer were calculated by using the boundary element method to investigate the effect of the interlayer on the stress distribution. The relation between the free-edge singular stress fields of bonded dissimilar materials with and without an interlayer was investigated numerically. It was found that the influence of the interlayer on the stress distributions was confined within a small area of the order of interlayer thickness around the intersection of the interface and the free-surface when the interlayer was very thin. The stress distribution near the intersection of the interface and the free-surface was controlled by the free-edge stress singularity of the bonded dissimilar materials without the interlayer. In this case, the interlayer can be called free-edge singularity-controlled interlayer. If a stress distribution on the interface is known for one thickness of an interlayer h, stress distributions on the interface for other values of h can be estimated.