高延性接着剤の粘塑性変形挙動とそのモデル化

抄録

The adhesive strength of structural joints has been intensively investigated for the past three decadesfor mainly epoxy adhesives.Recently, instead of the epoxy type, acrylic adhesives, which have much higherductility than epoxy adhesives, have been developed. This type of adhesive will have a wide variety ofindustrial applications.In this review, Tensile lap shear tests of aluminium single-lap joints were performed at various temperatureof 10-40 ℃ at several tensile speeds. Based on the experimental results, a new constitutive model oftemperature-dependent elasto-viscoplasticity of the adhesive was presented. Experiments to determineadhesive strength of butt-joint which was subjected to combined tension and torsion were performed . In thisexperiment, aluminum butt-specimens with an acrylic adhesive were used. A tubular butt-joint was subjectedto torsion under a tensile load. In order to examine the deformation speed and temperature on strength,several levels of torsional speeds and temperatures were chosen. The fracture strength strongly depends onthe torsional speed and the temperature, i.e., it becomes higher at lower temperature and at higher speed. Inorder to discuss the effect of the strain rate and temperature, numerical simulations of the combined-stresstest were conducted using a rate and temperature-dependent constitutive model. The calculated results are ingood agreement with the corresponding experimental data.