Energy principle of the indentation-induced inelastic surface deformation and hardness of brittle materials

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90194-W· OSTI ID:6469925

Sakai, M ^[1]

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1. Toyohashi Univ. of Technology, Toyohashi (Japan). Dept. of Materials Science

Energy-based considerations on the inelastic surface deformation of brittle materials are conducted. The hysteresis loop energy U[sub r] which is dissipated during the indentation loading-unloading cycle is related to the true hardness H, apparent hardness H, and the work-of-indentation [Gamma][sub I]. The true hardness has its energy-derived meaning of the irreversible energy consumption to create a unit volume of the indentation impression of ideally plastic materials. The relationships between U[sub r] and the three-half power of indentation load P[sup 3/2], and between U[sub r] and the volume of the indentation impression V[sub I] are used to separate the plastic contributions from the complicated plastic/elastic surface deformation processes in indentation hardness tests. The linear relationship of U[sub r] vs P[sup 3/2] provides an important experimental technique for determining the true hardness H of brittle materials. The linear relationship of U[sub r] vs V[sub I] is available to the experimental determination of [Gamma][sub I]. The mechanical and physical meanings of the conventional Vickers indentation hardness of brittle materials are also addressed in relation to H, [cflx H] and [Gamma][sub I].

• OSTI ID: 6469925
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:6; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
BRITTLENESS
CERAMICS
DEFORMATION
ELASTICITY
ELEMENTS
ENERGY LOSSES
FRACTURE PROPERTIES
HARDNESS
LOSSES
MECHANICAL PROPERTIES
METALS
PLASTICITY
TENSILE PROPERTIES