胶粘剂特性和厚度对劈裂载荷作用下胶接接头应力分布的影响

运用三维弹塑性有限元法对劈裂栽荷作用下的胶接接头(即劈裂接头)承载后的应力分布特征进行了分析，重点研究了胶粘剂层厚度对劈裂接头应力分布的影响。结果表明，胶粘剂的性能对应力分布有较大影响，提高胶粘剂强度和减小胶层厚度，均导致胶层应力集中加剧，各向正应力峰值呈上升趋势，各向剪切应力则正好相反；并且劈裂接头中应力分布以三向主应力为主，剪切应力的存在亦不可忽略。故在不引起过大应力集中和较大胶层缺陷条件下采用高强度的胶粘荆和较厚胶层对提高劈裂接头强度有利，实验结果与有限元分析相吻合。

Influence of elastic modulus and thickness of adhesive on stress distribution of adhesive bonded joints under cleavage loading

The stress distribution of adhesively-bonded metal/metal single lap joints under cleavage loading is analyzed using three-dimensional elastic-plastic finite element method (FEM).The influence of adhesive thickness on the stress distribution of cleavage joints is discussed in detail. It is shown that adhesive has great influence on the stress distribution of the lap region. Increasing thickness or elastic modulus of adhesive also can cause the stress concentration at the left end of the adhesive layer. With the increment of thickness or elastic modulus of adhesive, peak values of normal stress components increase but that of shear stress components on the contrary. However, observations have been made in particular on normal and shear stress components at the interfaces, which provides useful insight into the 3D nature of the problem. For verification, experiments were performed on the joint strength. The analytical results were consistent with the experimental ones.