コーティング材スクラッチ試験における界面密着強度評価の試み

概要

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Scratching test is widely used to examine the adhesive strength of coating materials where the adhesive strength is evaluated as the critical load. However, such a critical load depends on shape of diamond indenter, frictional condition, thickness and mechanical properties of coating layer, etc. The critical load criterion cannot provide a material characteristic evaluation but a relative evaluation. This study has proposed an evaluation criterion for adhesive strength, based on the interfacial shear stress induced by the indenter. An iterative analysis method has also proposed to obtain the interfacial stress by the FEM program ABAQUS, with taking account of the tangential force. It was found that the tangential force in the scratching, which is obviously independent of the adhesive strength, has a sever effect on the critical load. The smaller the tangential coefficient is, the higher the critical load becomes. Scratch tests were carried out under three test conditions with various frictional coefficients. It was found that the experiment results can be explained based on the criterion proposed.
社団法人日本機械学会の論文
2002-06-25