Hardness testing of plastics | Zendy

Phillips P. J. | Zendy; Ramakrishnan N. R. | Zendy; Oxlade P. L. S. | Zendy

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Hardness testing of plastics

Author(s) -

Phillips P. J.,

Ramakrishnan N. R.,

Oxlade P. L. S.

Publication year - 1978

Publication title -

polymer engineering and science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.503

H-Index - 111

eISSN - 1548-2634

pISSN - 0032-3888

DOI - 10.1002/pen.760181108

Subject(s) - rockwell scale , materials science , viscoelasticity , extrapolation , indentation , indentation hardness , composite material , deformation (meteorology) , compression (physics) , microstructure , mathematics , mathematical analysis

The effect of time of indentation and time of recovery on the Rockwell hardness, of a series of glassy and crystalline polymers has been determined. An analytical technique, based on conventional viscoelastic approaches, has been developed. This technique permits the resolution of the hardness number into its components of permanent deformation, retarded elastic compression, and retarded elastic recovery. Subtraction of components due to retarded elastic response results in hardness numbers dependent only the time‐dependent permanent deformation. Extrapolation of this data to zero time results in an absolute or time‐independent value of Rockwell hardness, designated R o .

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