Fully automatic penetration hardness tester

Details Fully automatic penetration hardness tester Fully automatic penetration hardness tester

1983-06-30

1985-08-13

Caldwell, Sr., John W.

Measuring and testing

Hardness

By penetrator or indentor

G01N 344

Patent

active

045342121

ABSTRACT:
A fully automatic penetration hardness tester which includes a penetrator and clamp driven by respective serially-connected pneumatic cylinders for engaging test specimens. Pressure regulators are coupled to the respective cylinders for first applying clamping pressure against the test specimen and then applying a plurality of loads in a predetermined sequence to the clamped specimen through the penetrator, with the total clamping and penetrator pressure against the test specimen remaining constant through the test cycle. A control circuit monitors penetrator position and automatically initiates application of the next load in the test sequence when motion of the penetrator following application of the preceding load has settled such that a predetermined number of sequential position readings fall within a preselected position range. Specimen hardness is determined as a linear function of penetration depth under the various loads. An automatic calibration feature determines gain and offset of such linear function from actual and apparent hardnesses of two test specimens of known differing hardness.

REFERENCES:
patent: 3416367 (1968-12-01), Ernst
patent: 4245496 (1981-01-01), Napetschnig
patent: 4331026 (1982-05-01), Howard et al.
Dorf, Richard C., Modern Control Systems, Addison-Wesley Pub. Co., 1974, pp. 110-119.

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