Multiple gage length extensometer

Details Multiple gage length extensometer Multiple gage length extensometer

1991-03-26

1992-06-09

Haroian, Harry N.

Geometrical instruments

Distance measuring

Opposed contacts

G01N 304

Patent

active

051195690

ABSTRACT:
An extensometer for measuring strain in a specimen on which the extensometer is mounted which has two arms joined together at first ends, and with specimen engaging knife edges at the second ends. The knife edges will engage a specimen at spaced locations, so that when the specimen is subjected to a load, the knife edges will separate, and the amount of separation will be an indication of the strain in the specimen. The distance between the knife edges is known as the "gage length" and the present invention relates to providing for mounting the knife edge contact points in a selected plurality of positions in which the gage length of the extensometer is changed from other of the positions of the knife edges.

REFERENCES:
patent: 3789508 (1974-02-01), Meline
patent: 4507871 (1985-04-01), Meyer et al.
patent: 4831882 (1989-05-01), Meline et al.
Product Specification Model Series 632.15, MTS Sysems Corporation, Pub. date 1978, 2 pages.
MTS Drawing No. 417692-XX, admitted prior art.
MTS Drawing No. 8068445-XX, admitted prior art.
MTS Drawing No. B068446-XX, admitted prior art.
MTS Drawing No. 157353-XX, admitted prior art.

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