接着継手の強度評価への破壊力学の応用 : 第2報、各種接着継手の疲労き裂伝ぱ特性

概要

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This study investigates the problem of applying fracture mechanics to evaluation of the strength of adhesive joints. Various types of adhesive joint specimens with a crack in an adhesive layer are prepared for the fatigue tests and static tests. The adherend is acryl plate and the adhesive is cemedine 1500. The energy release rates G_I and G_<II> for various adhesive joints are analyzed by FEM and modified virtual crack extension method. Comprehensive mixed mode conditions from pure mode I to nearly pure mode II are realized in this study. In all adhesive joint specimens, the debonding fatigue crack grows along the adhesive interface. It is found that the fatigue crack growth rate in various adhesive joints can be well characterized by the total energy release rate range ΔG_T, which can be evaluated by the measurement of compliance. However, the fracture toughness results obtained using the same specimens show a mixed mode fracture criterion for adhesive joints, which can be characterized by G_I and G_<II>. Therefore, different approaches are necessary for the fatigue crack growth and fracture toughness of adhesive joints.
一般社団法人日本機械学会の論文
1989-09-25