Premium
Role of Densification in Deformation of Glasses Under Point Loading
Author(s) -
ERNSBERGER F. M.
Publication year - 1968
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1968.tb13318.x
Subject(s) - materials science , ultimate tensile strength , composite material , deformation (meteorology) , residual stress , plasticity , flow stress , measure (data warehouse) , microstructure , database , computer science
It is proposed as a working hypothesis that the many so‐called microplastic effects produced by pressure of hard, sharp points on glasses do not occur by plastic flow, but by densification. An interferometric technique is illustrated, by means of which the existence of densification can readily be demonstrated and its magnitude estimated. It is concluded that the “hardness” number of glasses is best interpreted as a measure of the critical stress for yield by densification; that the hardness number has no necessary relation to tensile strength; and that the technology of glass cutting is dependent on residual stresses associated with densification.