逆対称CFRP積層板の引張-ねじり連成変形の定量化

抄録

The deformation behaviours of various CFRP laminates are explained by classical lamination theory based on plate theory. The presence of B_ij components in the bending-extension coupling stiffness matrix implies the twist deformation under tensile loading. The specific applications of laminated composites require antisymmetric laminates to achieve design requirement, for example, some form of coupling is necessary to design a turbine blades with pre-twist without using a complex mold. It was well known that the antisymmetric laminates don’t have zero components for B_ij(i≠j). In previous studies, the deformation of antisymmetric CFRP laminates have been analysed, on the other hand, the accurate evaluation have not been experimentally measured due to jig friction. Therefore, in order to make it possible to experimentally evaluate the tensile-twist coupling deformation of the antisymmetric laminate, we developed a novel jig to measure twisting under tensile loading. Three types of experiments were conducted by using thrust bearing that reduces twisted friction and radial bearing that reduces friction on the twisted center axis, and then changing the mounting method to the testing machine. In order to evaluate the validity of the proposed method, we compared the B_ij value obtained by the classical lamination theory and the twist angle obtained by the FE analyses with the experimental results. As a result, the twist deformation under tensile loading using the proposed jig combined thrust bearing with radial bearing had a strong correlation of 0.96 with the results of the FE analyses.