熱可塑性複合材料における界面応力伝達・マトリックス応力集中に関するパラメータの推定

概要

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In order o evaluate the interface properties of Glass Fiber Reinforced Polypropylene in the different adhesive condition, a surface of polypropylene stampable sheet is modified by O_2 plasma treatment method. Deformation and fracture properties are investigated by the static tensile test, and the stress-strain relation is regressed by 3-elements visco-elastic model to estimate the interface properties. The interface estimation is expressed following two parameter ; γ : composites'stress transferability to reinforcements through the interface (=fiber's strain/composites'strain), and a : strain intensity in matrix for composites'strain (=matrix's strain/composites'strain-1). The tensile strength of the treated composites is increasing about 40% with the 40% increment of the interlaminar strength by the plasma treatment. The regression result says the fiber reinforced effect is promoted with the interface adhesion (γ=60% to 85%), and this makes the ultimate strength be increasing. The value of a=45% in non-treated composites (in treated one, a=15%) shows the partial strain presents with a stress concentration around adhesive failures. Fractgraphies show the alternation of γ and a, so that the critical fracture is due to this partial plastic strain in non-treated one, hence, due to the interlaminar fracture because of the higher stress transferability in treated one.
一般社団法人日本機械学会の論文
1999-05-25