Fusahito Yoshida

Strength of Highly Ductile Acrylic Adhesive in Butt-Joint under Combined Tension and Torsion

Combined tension-torsion experiments of an adhesively bonded butt-joint were performed using a highly ductile acrylic adhesive. From the experiments, it was found that the multi-axial flow stresses and fracture limits are strongly dependent on shear strain rate and stress multi-axiality. The multi-axial flow stresses are calculated with an extended version of the present authors’constitutive model, and they are compared with the corresponding experimental data. Furthermore, fracture limit curves expressed in the normal and shear stress plane is discussed based on the experimental data and the numerical predictions.

Elastic-Plastic Bending Deformation of Adhesively Bonded Sheet Metals in Tensile Lap Shear Tests with Special Reference to Effect of Tensile Speed

In order to investigate the effect of tensile shear-induced bending deformation of sheet metals in adhesively bonded single-lap joint on the shear strength of adhesive, in the present work, tensile lap shear experiments on an aluminium sheet joint bonded with the acrylic adhesive were performed at room temperature. Since this type of adhesive has strong rate sensitivity in flow stress, bending deformation becomes larger with increasing tensile speeds. For the prediction of bending deformation, a numerical analysis of elastic-plastic bending deformation of single-lap sheet metals is presented. From the experimental data and the corresponding numerical results, the effect of tensile speed on the bending deformation is discussed. To reduce the bending deformation, a new experimental technique of reinforcement of an adherend sheet with a high-rigidity plate is proposed.