In this paper, the effect of tensile loads single-lap adhesive joints of composite in three dimensions is investigated. First, the model of single-lap joint which consists of two composites and FM73 adhesive, it is modeled in three dimensions by using MATLAB software.Then, the model is analyzed analytically by using the meshless method, which is one of the newest numerical methods of analysis. In this regard, the displacement in each node is calculated by using element free Galerkin method, which is one of the numerical methods of the meshless method.Moving least square regression method is used in this analyze. Then the three-dimensional normal and shear stress distributions in the length and depth of the mid-plane of adhesive layer that subjected to tensile load is obtained. To confirm the results of the meshless method, the model was investigated by using the finite element method and stresses that obtained from this method was compared with the meshless method results.The normal and shear stresses were obtained and compared for eight different orientation of carbon/epoxy composite.

A three-dimensional numerical method for the analysis of Single-lap Adhesive Joints of Aluminum under bending load is presented. Firstly, a meshfree numerical method is investigated for the simulation of the single-lap joint under Four Point Bending load. The element free Galerkin numerical method based on moving least-squares shape functions is used in the meshfree method. The discontinuities at the adhesive segments are approximated with additional degrees of freedom at the nodes. Secondly, we use finite element method by using Ansys program to verify the meshfree method's results and we concluded that the results are consistent in two meshfree and finite element methods.In this meshfree method, we find the displacement in each node for a defined load by using moving least square and element free Galerkin methods, and from these displacements obtainedthe three-dimensional normal and shear stress distributions in the length and depth of the mid-plane of an adhesive layer thickness of 0.12 mm and a lap length of 25 mm, subjected to bending loads at four points. Then calculated Raghava damage criterion for nodes in adhesive segment for two meshfree and finite element methods.