接着継手の混合モード破壊基準

概要

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This study investigates the problem of applying fracture mechanics to evaluation of the strength of adhesive joints,focusing on mixed mode fracture criteria. Various types of adhesive joint specimens with a crack in an adhesive layer were prepared for the static tests and fatigue tests. The adherend was acryl plate and epoxy plate and the adhesive was cemedine 1500 and EP-007. The energy release rates G_I and G_<II> for various adhesive joints were analyzed by FEM and modified virtual crack extension method. Comprehensive mixed mode conditions from pure mode I to nearly pure mode II were realized in this study. The fracture toughness results obtained showed a mixed mode fracture criterion peculiar to adhesive joints,which can be characterized by G_I and G_<II>. It was found that the fatigue crack growth rate in various adhesive joints can be well characterized by the total energy release rate range ΔG_T. Therefore,different approaches are necessary for the fatigue crack growth and fracture toughness of adhesive joints under mixed mode conditions.
社団法人日本材料学会の論文
1990-08-15