Al/CFRPハイブリッド材料の残留応力制御

概要

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The hybrid material in this paper has been built up from many thin aluminum alloy and unidirectional CFRP layers. As a result of the different thermal expansion coefficients of aluminum alloy and CFRP layer, the residual thermal stresses are present after cooling down from the curing temperature to room temperature. Two methods were used to control the residual thermal stress. One is to cure the composite under tensile force applied to the CFRP layers only and the other is to apply a stress which produces small plastic strain in the aluminum layers to the laminate after molding. The second method was very simple and the residual stresses could be controlled more precisely than in the first method. Some experiments were carried out on the hybrid plates controued and not controlled. The following results were obtained : The tensile yield stress of the controlled composites plate increased more than that of the uncontrolled plate. However, the compressive yield stress decreased. The ultimate strain and the inter laminer shear strength, decreased due to the operation of the residual stress control. Some acoustic emission inspection showed that much interracial failure was produced between aluminum alloy and CFRP layers during the operation of the second method. It was estimated that this was the factor causing the decrease in inter laminar shear strength.
社団法人日本材料学会の論文
1992-05-15