Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1986-07-16
1987-06-30
Levy, Stewart J.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73810, G01N 332
Patent
active
046761101
ABSTRACT:
A fatigue testing apparatus (10) for simultaneously subjecting a plurality of material test specimens (24) to cyclical tension loading to determine the fatigue strength of the material. The fatigue testing apparatus includes a pulling head (12) having cylinders (26) defined therein which carry reciprocating pistons (32). The reciprocation of the pistons is determined by cyclical supplies of pressurized fluid to the cylinders. Piston rods (18) extend from the pistons through the pulling head and are attachable to one end of test specimens, the other end of the test specimens being attachable to a fixed base (38), causing test specimens attached between the piston rods and the base to be subjected to cyclical tension loading. Because all of the cylinders share a common pressurized fluid supply, the breaking of a test specimen does not substantially affect the pressure of the fluid supplied to the other cylinders nor the tension applied to the other test specimens.
REFERENCES:
patent: 2356763 (1944-08-01), Keinath
patent: 3065632 (1962-11-01), Crane et al.
patent: 3304768 (1967-02-01), Naumann et al.
patent: 3491586 (1970-01-01), Branger
patent: 3793880 (1974-02-01), Sugi et al.
patent: 3937071 (1976-02-01), Slota et al.
Hodo James D.
Moore Dennis R.
Morris Thomas F.
Tiller Newton G.
Beumer Joseph H.
Levy Stewart J.
Manning John R.
Raevis Robert R.
The United States of America as represented by the Administrator
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