Modeling of viscoplastic behavior of highly ductile acrylic adhesive under cyclic torsion and its application for press- forming analysis of adhesively bonded sheet metals

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The cyclic torsion test was carried out by tubular butt-joint with highly ductile acrylic adhesive, and it was investigated the relation between shear stress and shear strain with various experimental conditions. In addition, the shear stress-strain constitutive equation was considered. And the constitutive equation was incorporated into the user subroutine of a general purpose finite element analysis program. Subsequently, the experiments and analysis of the stretch-bending/unbending and die-bending for adhesively bonded sheet metals were performed.