The Stress and Strength Evaluations of Single-lap Adhesive Joints of Bamboo Plate Adherends under Static Bending Moments

This paper deals with testing the stress distributions and strength in single-lap adhesive joints of bamboo plate adherends after being subjected to static bending moments. Stress and strain were calculated using an elastic and orthotropic finite-element method (FEM). In addition, the surface strain distributions of single-lap adhesive joints under static bending moments were measured using strain gauges. Reasonable correlation was found between the numerical and the experimental results. It was found that the maximum value of the maximum principal stress, σ1, appears at the interface between the adhesive layer and the adherend. The normal stress in the direction perpendicular to the fiber was greatest near the singular points. Bending strength tests were performed. In the case where the width of the joints and the lapped length were equal, it was found that the bending strength was maximal. Furthermore, the joint strength was predicted using two singularity parameters from the calculation results. Fairly good agreement was found between the predictions and the experimental results.