A Diagram for Evaluating Delamination of GFRP/Stainless-steel Adhesive Joints by Using Stress Singularity Parameters

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  • GFRP/ステンレス鋼接着継手のはく離評価線図
  • GFRP ステンレス コウ セッチャク ツギテ ノ ハクリ ヒョウカセンズ

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Abstract

We developed a delamination evaluation diagram of glass fiber reinforced plastics/stainless steel adhesive joints by using stress singularity parameters. Using this diagram, we can evaluate the delamination strength of adhesive joints. First, we performed static tests on double lap adhesive joints and T-type adhesive joints. We developed a device that applies contact pressure to glass fiber reinforced plastics/stainless-steel double lap adhesive joints. The device is composed of a bolt adhered to a strain gauge for controling contact pressure. Using this device, we investigated the effect of contact pressure on the delamination strength of double lap adhesive joints. We applied tensile shear stress to double lap adhesive joints in order to apply contact pressure to their adhesive interfaces. We found that the delamination strength of the double lap adhesive joints increased with increasing contact pressure. On the contrary, when we applied compressive shear stress to the double lap adhesive joints, the delamination strength stayed constant. We therefore conclude that the delamination strength of double lap adhesive joints is dominated by normal stress when contact pressure under tensile shear stress is applied. On the other hand, it was dominated by shear stress when contact pressure under compressive shear stress was applied. Second, we analyzed stress singularity parameters on double lap adhesive joints and T-type adhesive joints by using FEM. Stress distributions near the bonding edge could be expressed by the stress singularity parameters. Finally, we made a delamination evaluation diagram using stress singularity parameters. We can evaluate the delamination strength of adhesive joints using this diagram.

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