Stress Analysis and Strength of Single Strapped Adhesive Joints Made from Bamboo and Hinoki Subjected to Bending Moments

摘要

This paper deals with the determination of stress and strength of single strapped adhesive joints made of - bamboo and hinoki wood, when subjected to static bending moments. The resulting material properties of the hinoki and bamboo composite were determined by tension tests parallel, perpendicular, and at an angle of 45 degrees to the fiber direction. Stress and strain were calculated using an elastic and orthotropic finite-element method (FEM). In this test, the two hinoki plates were unbounded. The greatest stress was incurred on the hinoki side of the adhesive layer near the ends of the bamboo plate. The result was calculated following the adhesion of two pieces of hinoki wood to a bamboo plate. The effects of variations in thickness and length of the bamboo element relative to the strength of joints were examined. It was found that the strength of the joints increases as the length of the bamboo increases, but the effect of thickness was not very important. In addition, surface strain distributions under static bending moments were measured using strain gauges. Reasonable correlation was found between the numerical and experimental results. Bending strength tests were performed. It was observed that the bending strength of the laminated composite plate increased with an increase in the proportion of bamboo element thickness. The separation process became clear by experiments and through observation of the ruptured surface. It was found that the separation started from the point of greatest stress, which was calculated by FEM. Verification of the calculated result was shown.