表面波による重ね合せ接着継手のき裂進展評価

概要

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The crack growth behavior on the lap joints with various adhesive thicknesses was investigated by the echo characteristics of surface wave emitted toward the adhesive layer under shearing forces. The echo height reflected from the edge of adhesive layer and the round-trip propagation time from the surface wave probe to the adhesive layer were measured for evaluating the crack growth behavior. The crack was generated along the adhesive interface when the ratio of the round-trip propagation time suddenly increased. After that, the crack rapidly grew. In the case where the distance between the surface wave probe and the adhesive layer was 10 mm, the crack of the adhesive layer was able to detect when the ratio of the round-trip propagation time became about 1% and the ratio of echo height reflected from the edge of adhesive layer became about 60%. Moreover, the shearing stress of crack generation was about 52% of the shearing strength.
一般社団法人日本機械学会の論文
1998-08-25