524 Simulation of Progressive Shear Strain Accumulation in Adhesive Layer under Cyclic Loading of Single-lap Joint using Highly Ductile Acrylic Adhesive

Abstract

This paper deals with the behavior of progressive shear strain accumulation (viscoplastic ratcheting) using highly ductile acrylic adhesive under cyclic loading. From experimental observation in load-controlled cyclic tests, we can see three stages of strain accumulation: the primary stage where first the ratcheting progresses rapidly; the secondary stage where the rate is kept almost constant; and the tertiary stage where the rate increases rapidly with cycles, and it leads to final fracture of joint. In order to discuss the behavior, the numerical simulation of ratcheting was conducted using our original damage model of elasto-viscoplasticity for the adhesive.