Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specimen clamp – holder – or support
Patent
1988-04-04
1989-07-04
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specimen clamp, holder, or support
73837, G01N 302
Patent
active
048438880
ABSTRACT:
A tensile test grip for holding a specimen has a pullrod that is mounted in an annular bore, and carries a piston head that fits within a piston chamber, and both the pullrod and piston head are sealed on their outer surfaces with respect to the body forming the piston chamber, to form an enclosed chamber in which hydraulic fluid can be provided to permit swiveling alignment of the pullrod and the piston head relative to the housing that is a function of the direction of loading between the pullrod and the housing. The seal on the pullrod and the seal on the piston head with respect to the respective surfaces on which they seal is on a very short part spherical land to permit the pullrod and piston head to shift with respect to the housing and provide self alignment. The pullrod and piston can swivel freely for a limited amount to provide alignment during tensile loads. Spherical seats can be provided on the piston and arranged so that the seats can be locked together after initial alignment, to carry compression loads and permit testing the specimen in compression.
REFERENCES:
patent: 1023154 (1912-04-01), Kenerson
patent: 1865070 (1932-06-01), Amsler
patent: 3320798 (1967-05-01), Gram
patent: 3605487 (1971-09-01), Corbett
patent: 4533274 (1985-08-01), Moore
patent: 4686860 (1987-08-01), Liu
Lange, F. F. et al., Powder-Cushion Gripping . . . Testing, Journal of Testing and Evaluation, vol. 6, No. 5, Sep. 1978, pp. 320-323.
Gram Martin M.
Johnson Luther E.
Larsen Carl G.
MTS Systems Corporation
Myracle Jerry W.
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