ID法で得られた残留応力の微組織による影響(G03-6 実験計測(2),G03 材料力学)

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  • Influence of microstructure upon residual stress obtained by ID method

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In this study, The ID (indentation) method was used as a simple the measure of residual stress, and the influence of microstructure exerted on values obtained by the ID method was investigated for various Al_2O_3 ceramics. The residual stress ratio φ' of Al_2O_3 ceramics (the ratio of the value obtained by ID method and the setting stress value) changed with the microstructure (grain size and aspect ratio) of ceramics. When the setting stress value was tensile and the ID values were small, microstructure affects the values obtained by the ID method. The change of residual stress ratio φ' may be caused by the difference in indentation crack propagation behavior.

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