ぜい性材料の表面変形

概要

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"Hardness" and "ductility" of brittel materials are addressed on the basis of energy principle for their surface deformation processes. Details of the hysteresis behavior associated with Vickers indentation loading-unloading process are studied. The hysteresis loop energy is related to the plastic/elastic deformation, hardness, and the ductility of brittle materials where a novel parameter, work-of-indentation, Γ_I (J/m^3), is defined and experimentally characterized as irreversible energy dissipation for the formation of unit indentation impression. The Γ_I reduces to the hardness, H, for perfect plastic materials. The finite difference between Γ_I and H of brittle materials arises from the elastic recovery of surface deformation after indentation unloading. The physical meaning of the hardness of brittle meterials is scrutinized.
社団法人日本材料学会の論文
1992-07-15