Method and apparatus for measuring strength characteristics

Details Method and apparatus for measuring strength characteristics Method and apparatus for measuring strength characteristics

1979-11-13

1981-06-02

Woodiel, Donald O.

Measuring and testing

Hardness

By penetrator or indentor

G01N 348

Patent

active

042703832

ABSTRACT:
An apparatus and method for measuring the flow stress and like characteristics of metals and other material especially at hot working temperatures. The specimen is struck simultaneously by projectiles of equal mass but unequal velocity. The velocities of the projectiles and the dimensions of the different indentations produced upon the specimen by the projectiles are terms in the formula by which the flow stress is calculated. A formula requiring only two projectiles is adequate for many materials; one requiring three projectiles may be better for materials that show work-hardening when they undergo strain at high temperature. The projectiles may be propelled pneumatically or by contact with a driven lever. Alternatively the projectiles may be in the form of masses carried as pendulums.

REFERENCES:
patent: 2323925 (1943-07-01), Markwardt
patent: 3339404 (1967-09-01), Brooks et al.

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