弾性異方性を示す鋼板の角筒のねじり剛性

Abstract

Elastic moduli of metal sheets have planar anisotropy determined by crystalline texture. Texture control is effective in raising Young's modulus of steel sheets in some directions on the plane. Some steel sheets with strong elastic anisotropy produced by cold-rolling and continuous annealing can be applied to some structural components to improve their rigidity. However, the elastic anisotropy of the steel sheet with texture has been applied to few industrial products because the structural design using anisotropic materials is difficult. In the present study, two steel sheets with different texture were prepared for the experiments and numerical simulation, the torsional rigidity was investigated in steel square tubes with elastic anisotropy. Torsional rigidity have been examined, it depended on the direction of the sheet applied to the component. It was most effectively improved when the direction of the highest shear modulus coincided with longitudinal direction in the square tube. Elastic compliance matrix was identified by fitting to Young's modulus of steel sheet with elastic anisotropy, and finite element analysis was carried out using shell elements by considering the elastic anisotropy. Furthermore, the Voigt-Reuss assumption calculations of elastic anisotropy based on the texture measurements revealed that the decreases in shear modulus at diagonal direction were caused by the ODF intensity around {110}<001> component, and the increases in shear modulus were caused by {112}<110> component.