G031073 接触負荷を受ける硬質めっき膜の破壊機構([G031-07]材料力学部門,一般セッション : 表面処理)

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タイトル別名
  • G031073 Fracture Mechanism of Hard Plating subjected to Contact Loading

抄録

The contact fracture property and mechanism of electroplated Ni-P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach. First, the elastoplastic properties of both coating and substrate were evaluated using micro indentation tests. Next, ball indentation test with large contact force was performed, such that the brittle coating on ductile substrate suffers from cracks, including ring crack (propagates circumferentially) and radial cracks (propagates radially), owing to the coating bending effect. The fracture nucleation process was investigated using the acoustic emission technique (AET). In addition, finite element method (FEM) with cohesive zone model (CZM) was carried out to compute stress field and simulate crack initiation around the impression during the test. By using the comprehensive experimental/computational framework, the nucleation process (mechanism) of such a complicate crack system was clarified. The present technique and fracture mechanism may be applicable to the analysis of structural integrity of other brittle coatings.

収録刊行物

  • 年次大会

    年次大会 2013 (0), _G031073-1-_G031073-4, 2013

    一般社団法人 日本機械学会

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