Method of testing hardness in rebound type hardness tester

Details Method of testing hardness in rebound type hardness tester Method of testing hardness in rebound type hardness tester

1998-03-20

1998-10-27

Raevis, Robert

Measuring and testing

Hardness

Scleroscope or rebound

G01N 330

Patent

active

058279539

ABSTRACT:
An impacting velocity v.sub.1 and a rebounding velocity v.sub.1 ' of the hammer at a second hammer velocity measurement point 12 a distance x.sub.1 apart from a first hammer velocity measurement point 11 in the system of movement of the hammer are measured and the hardness H of the specimen is calculated in accordance with Equation 1, ##EQU1## where x.sub.2 denotes the distance between the first hammer velocity measurement point 11 and the specimen 2 and .alpha. denotes the acceleration acting on said hammer. Thereby, a hardness test in a rebound type hardness tester can be performed without measuring the velocities of the hammer immediately before impacting against the specimen and immediately after the impaction.

REFERENCES:
patent: 2654244 (1953-10-01), Braid
patent: 3879982 (1975-04-01), Schmidt

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