Effects of Adherend Dimensions on Fatigue Life of Reinforced Aluminum Structures Combined with CFRP Bonded Adhesively

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  • CFRP接着補強構造物の疲労強度に及ぼす被着体の寸法効果
  • CFRP セッチャク ホキョウ コウゾウブツ ノ ヒロウ キョウド ニ オヨボス ヒチャクタイ ノ スンポウ コウカ

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Abstract

In the assembly lines of cars, long handling arms of aluminum alloy have been used for the forming of automotive bodys. We developed a new handling arm bonded CFRP plates adhesively on the side in order to reinforce the stiffness and reduce the vibration. In our last study, a new method to predict the fatigue life of the handling arms was proposed. In the method, the fatigue life of the actual arms was calculated based on those of smaller joint specimens (scale-downed specimens) bonded adhesively. The smaller specimens were loaded so that the stress value in the adhesive layer could be similar to those in the actual arms. The stress values of the arms and specimens were calculated by Finite Element Method. The other prediction methods based on material mechanics was also evaluated because it was easier the previous method based on FEM. It was, strangely, more precise rather than the previous analytical one in terms of predicting the fatigue lives. The reason may be unconscious of three dimensional effects such as crack propagation in the width direction of the adhesively bonded joints. Therefore, the effect had to be investigated more carefully in order to determine which method is more suitable. In this study, we investigated the validity of the prediction methods based on FEM and material mechanics for the various case of different thickness and width of the adherends. Additional fatigue tests were carried out using four types of the smaller specimens having the different thickness and width for the aluminum adherends. As the result, we found that the fatigue lives must be influenced mainly by the thickness of the aluminum alloy and we could predict them by means of precise stress analysis considering the adherend thickness.

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