ハイブリッド複合材料GLARE2の非主軸非弾性挙動とプライ破損を考慮した積層理論による解析

概要

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Inelastic and fracture behaviors of a new fiber-metal composite GLARE 2, a unidirectional hybrid laminate of glass/epoxy laminae and aluminum alloy sheets, have been examined under various off axis static tensile loading conditions. The classical laminated plate theory (CLT) has been applied to describe the off-axis inelastic behavior of GLARE 2, in which the failure-induced elastic degradation of GFRP plies was taken into account. For all off-axis angles, a clear transition from the linear to nonlinear deformation regime appears. The stress level of this sharp transition almost coincides with the yield stress of the constituent aluminum layers. The anisotropy in the fracture stress can be predicted using the Tsai-Hill theory. Taking into account the observation that for a 90℃ off-axis specimen the tangent modulus in the nonlinear regime is almost in agreement with that of the monolithic aluminum alloy, we have considered transverse cracking in the GFRP plies and modified the CLT so as to include the instantaneous degradation of the transverse and shear elastic moduli due to the transverse fracture. The results obtained using the CLT with ply failure accurately described the characteristic behavior of GLARE 2.
社団法人日本機械学会の論文
1996-09-25