ハイブリッド複合材料GLARE-3の室温と高温における非主軸非弾性挙動と積層理論による解析

概要

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Off-axis deformation and fracture of GLARE-3, a cross-ply hybrid laminate of glass/epoxy laminae (GFRP) and aluminum-alloy sheets, have been examined at room temperature (RT) and 100℃ (HT), respectively. The classical laminated plate theory (CLT) was applied for describing the off-axis tensile behavior of GLARE-3 laminates. Irrespective of the off-axis angles and test temperatures, the tensile stress-strain curves show a clear transition from linear response to nonlinear one. This is due to the yielding of the aluminum-alloys layers. The elastic modulus and static tensile strength decrease as the test temperature increases for all off-axis angles. Also, the flow stress at HT becomes smaller than that at RT. For θ = 15, 30 and 45°at HT, a sudden decrease in the flow stress takes place just before the ultimate fracture occurs. This fracture mode may be caused by the reduction of the adhesive strength between the GFRP and aluminum-alloy layers. A modified CLT model, which takes into account an incomplete failure in the GFRP layers, favorably describes the characteristics of the nonlinear deformation behavior of the GLARE-3 at RT and HT, respectively.
一般社団法人日本機械学会の論文
2003-04-25