Method and apparatus for measuring crack growth

Details Method and apparatus for measuring crack growth Method and apparatus for measuring crack growth

1988-03-25

1989-06-06

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73810, G01N 1908

Patent

active

048360295

ABSTRACT:
A method and apparatus for determining crack growth in an elastomer. A horizontally elongate elastomeric test specimen is cyclically stretched crosswise by upper and lower rigid plates contiguously attached to the long edges on both sides. The lengthwise growth of a crack induced by a small cut at one vertical edge of the specimen is determined by measuring the stretching force at each end. The lower plate is reciprocated by a hydraulic actuator relative to the upper plate. Two load cells measure the forces at each end of the specimen. With the use of a computer program and the relative forces measured by the load cells, the crack growth can be calculated.

REFERENCES:
patent: 3087148 (1963-04-01), Ludewig, Jr.
patent: 3803906 (1974-04-01), Ross
patent: 3908447 (1975-09-01), Salt
patent: 3983745 (1976-10-01), Juusola
patent: 4003246 (1977-01-01), Caln
patent: 4574642 (1986-03-01), Fleischman

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