Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1988-06-16
1989-06-06
Chapman, John
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01L 124
Patent
active
048360317
ABSTRACT:
In a method and apparatus for measuring deformations of test samples in testing machines, a test sample (4) is clamped into force transmitting units (10, 11). A light source (1) emits a light beam (2) which is reflected from at least one mirror (6, 6') arranged on the force transmitting units (10, 11) to impinge upon a position detector (7) which generates an output signal. The output signal is input to an electronic evaluating circuit (8) to determine the location or rather the location movement of the point of impingement of the light beam on the position detector. Preferably, but not necessarily, each force transmitting unit (10, 11) includes its own mirror (6, 6'), whereby the light beam (2) emitted by the light source (1) is reflected in sequence by the first mirror (6) of the first force transmitting unit (10) onto a second mirror (6') of the second force transmitting unit (11) and then onto the position detector (7). These steps and elements measure a test sample deformation and/or a deformation velocity with a high accuracy and in a simple manner, especially in fast tensile rupture testing machines.
REFERENCES:
patent: 2646716 (1953-07-01), Bowen
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patent: 3592545 (1971-07-01), Paine et al.
patent: 4181430 (1980-01-01), Shirota et al.
patent: 4425043 (1984-01-01), van Rosmalen
patent: 4605857 (1986-08-01), Ninomiya et al.
Journal of Scientific Instruments (Journal of Physics E), 1969, Series 2, vol. 2, pp. 375-377, Article Entitled: "The Application of a Light-Sensitive Potentiometer in the Measurement of the Mechanical Properties of Single Fibers".
Hintz Gerhart
Jatho Ralf
Keller Guenter
Carl Schenck AG
Chapman John
Fasse W. G.
Kane, Jr. D. H.
Raevis Robert R.
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