Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1991-08-23
1992-10-13
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
374 47, G01N 332
Patent
active
051540851
ABSTRACT:
A tension type dynamic viscoelasticity measuring apparatus composed of a strain detector for detecting changes in length of a specimen, an electromagnetic force generator for applying a force to the specimen, a moving mechanism for moving the electromagnetic force generator, a movement control unit for controlling the amount of movement of the moving mechanism, and a monotone function calculation unit for outputting a movement control timing to the movement control unit. The monotone function calculation unit performs a monotone function operation on the data of distance by which the moving mechanism has been moved and uses the calculation result as a movement control timing for the next movement control of the moving mechanism. As a result, this viscoelasticity measuring apparatus has a movement control loop that considers relaxation phenomena in connection with a change in length of the specimen due to stress relaxation and creep that occur in the specimen while driving the moving mechanism.
REFERENCES:
patent: 3470732 (1969-10-01), Welhoelter et al.
patent: 3550427 (1970-12-01), Sueyoshi
Myracle Jerry W.
Seiko Instruments Inc.
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