Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1982-06-17
1984-10-09
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73826, 73856, G01N 310
Patent
active
044754035
ABSTRACT:
A device to permit easily preloading a grip used in specimen testing by providing load carrying links and means for stressing the links to a load level higher than that encountered during the normal loading of the grip, and providing mechanical compressive load carrying surfaces between the load applying member and the grip which are held in compression under the prestress load. Specifically, the link is formed as part of the piston rod in a hydraulic test system and a separate hydraulic chamber is subjected to pressure to load the link after which the grip can be hand threaded down into a metal surface to metal surface abutting relationship with the load applying member. Once the pressure is relieved in the auxiliary cylinder the full force of the stress in the link will hold the load applying member and the grip in contact.
REFERENCES:
patent: 3163036 (1964-12-01), Lazan
patent: 3320798 (1967-05-01), Gram
patent: 3377847 (1968-04-01), Aske
patent: 3421366 (1969-01-01), Ely
patent: 3563086 (1971-02-01), Reed, Jr.
patent: 3800589 (1974-04-01), Wawra et al.
patent: 3835523 (1974-09-01), Stansfield
patent: 4018080 (1977-04-01), Fletcher et al.
patent: 4120230 (1978-10-01), Bunyan
MTS Production Specification, Series 641 Hydraulically Operated Grips, Published by MTS Systems Corp., 1979.
Chapman, Jr. John E.
Ciarlante Anthony V.
MTS Systems Corporation
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