Analysis of Brazed Single-Lap Joints Using the Peridynamics Theory
Analysis of Brazed Single-Lap Joints Using the Peridynamics Theory
复制标题
使用近场动力学理论分析钎焊单搭接接头
DOI：
10.2514/6.2006-2267
复制
发表时间：
2006
期刊：
影响因子：
4
通讯作者：
D. Ambur
中科院分区：
文献类型：
--
作者：
Bahattin Kilic;Bahattin Kilic;E. Madenci;D. Ambur;D. Ambur
C/C和C/C-SiC材料通常可以满足高温应用的设计要求。通过增加钎焊层的厚度来控制钎焊接头的强度。钎焊层的厚度是在微米级的顺序，和材料性能之间的不匹配的粘附体和钎焊是高应力集中的主要来源。这种应力导致层间分层和破裂，这可能导致过早失效。本研究的重点是分析材料性能、钎焊层和接头几何形状对接头裂纹萌生和扩展的影响。由于联合有宏观和微观长度尺度的组件，其分析需要使用一个理论，在中尺度，占这些长度尺度的相互作用。周向力学理论允许在多个长度尺度下进行时间相关分析，损伤是本构模型的一部分，材料响应在粘结水平下确定。该特征允许在材料内部引发和传播故障，而无需求助于裂纹引发或生长标准。
Design requirements for high-temperature applications can be usually satisfied by C/C and C/C-SiC materials. The strength of the brazed joint is controlled by increasing the thickness of the braze layer. The thickness of the braze layer is on the order of the micro scale, and the mismatch in material properties among the adherends and braze is a major source of high stress concentrations. Such stresses lead to interlayer delamination and cracking, which can lead to premature failure. The focus of this study is to analyze the effect of material properties, the braze layer, and joint geometry on the crack initiation and growth in the joint. Because the joint has macro- and micro-length scale components, its analysis requires the use of a theory at the meso-scale that accounts for the interaction of these length scales. The peridynamics theory permits time-dependent analysis at multiple length scales, damage is part of the constitutive model, and the material response is determined at the bond level. This feature allows initiation and propagation of failures inside the material without resorting to crack initiation or growth criteria.