Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1988-01-25
1989-02-07
Levy, Stewart J.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 300
Patent
active
048023671
ABSTRACT:
A tensile test controller has both load and stroke control circuits that are coupled together to permit tensile testing a specimen while controlling the load on the specimen, and when the specimen yields, for safely and smoothly switching to stroke control to complete the test and break the specimen. The controller has circuits which provide control over the velocity of the actuator as the specimen yields, and to prevent the specimen from being placed into compression, and also to sense the plastic specimen deformation a desired amount after it has yielded, but before the stroke control function is activated. Simplified supervisory gates are used to insure that the appropriate signal is controlling the test.
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Jerram, "An Axial Servo-Controlled High Strain Fatigue Machine", J. Phys. E. (GB) vol. 3, No. 7, Jul. 1970.
Pelloux et al., "Hydraulic Tension-Compression Fatigue Machine", The Review Of Scientific Instruments, vol. 35, No. 11, pp. 1564-1567, Nov. 1964.
Chasco David G.
Petersen Niel R.
Levy Stewart J.
MTS Systems Corporation
Raevis Robert R.
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