Tensile testing apparatus

Details Tensile testing apparatus Tensile testing apparatus

1991-09-25

1993-03-16

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

G01N 308

Patent

active

051933969

ABSTRACT:
The invention relates to a device for use in the direct tensile testing of materials, in particular brittle materials, which is self-centering under eccentrically applied loads. The apparatus effectively communicates a compressive load applied thereto to a tensile load applied substantially concentrically to the pull axis of the test specimen and thus can be employed to obtain direct tensile test characteristics by utilizing devices capable of exerting compressive forces only. In one embodiment, the apparatus comprises a pair of grips for gripping the specimen which are pivotally attached at right angles to respective sleeves in a dual sleeve assembly. The sleeves are movable so as to self-center the load which is applied, thereby eliminating bending stresses associated with off-centered loading and thus providing more accurate test results.

REFERENCES:
patent: 2697938 (1954-12-01), Tanaka
patent: 3107524 (1963-10-01), O'Connor
patent: 3481190 (1969-12-01), Inoue
patent: 3593573 (1971-07-01), Ely
patent: 3992928 (1976-11-01), Thoms
patent: 4686860 (1987-08-01), Liu
patent: 4866992 (1989-09-01), Rice
"Elements of Strength of Materials" Timoshenko et al. D. Van Nostrand Company, Inc. Princeton, NJ.COPYRGT.1962 pp. 308-311.

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