Al/CFRP 多層積層ハイブリッド複合材料の引張特性

概要

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Mechanical tensile properties of hybrid composites built up from many thin Al (aluminum-IN 30) sheeted and unidirectional CFRP prepleg layers (fiber volume contents 60%) were investigated. The thickness of Al sheets and of CFRP layers was 0.1 mm and 0.12 mm each. Their total number was 20. They were laid up alternately and symmetrically. The results obtained summarized as follows: (1) The estimated values of elastic moduli agreed well with the experimental ones. (2) The anisotropic residual stress after curing was calculated and its correctness was checked by using the stress-strain diagram. (3) Dependence of yielding strength on prestrain was verified theoretically and experimentally. (4) The average value of longitudinal strength was about 35% greater than that expected by the rule of mixture. Also the average transverse ultimate strain was about 65% greater than that of monolithic CFRP. The reason for these results was assumed to be that the A1 sheets which divide the CFRP into many thin layers tend to arrest the crack propagation, and consequently the failure mechanism of CFRP Iayers due to crack propagation changes to the cumulative weakening one.
社団法人日本材料学会の論文
1986-12-15