Article | REF: M4157 V1

Hardness of bodies - Analysis of other behaviors

Author: Éric FELDER

Publication date: September 10, 2005, Review date: March 17, 2021

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1. Viscoplastic alloys

1.1 Problem position

Scientists were quick to point out that the hardness of a metal alloy at high temperature decreases as the duration t of application of force P increases, and obtained empirical relationships of the type [47] :

lg H = M – m app lg t if P = Cte ( 1 )

The coefficients M and m app depend on temperature and test conditions; the factor m app , which we'll call apparent viscosity index, is a priori...

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Viscoplastic alloys