Surface instability detection apparatus

Details Surface instability detection apparatus Surface instability detection apparatus

1990-05-31

1991-06-18

Myracle, Jerry W.

Measuring and testing

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

By loading of specimen

G01N 308

Patent

active

050241036

ABSTRACT:
A compression test apparatus for geomaterial, such as rock or concrete, samples that is designed to provide measurements of a stress displacement characteristics of the failure zone. A geomaterial formed into a specimen comprising a right rectangular prism is supported by walls along two parallel faces and a back face. An axial load is kinematically applied by a plate that is suitably guided for movement against the specimen which is supported on bottom support plate. All of the surfaces in contact with the specimen are lined with hardened and polished steel plates and lubricated to minimize friction. The assembly of the specimen and its supports is in a conventional loading frame so that an axial load can be applied to one end of the specimen and reacted against the bottom plate. Displacement transducers monitor the lateral displacement of an unrestrained side surface of the specimen.

REFERENCES:
patent: 3505860 (1970-04-01), Bishop et al.
patent: 4825700 (1989-05-01), Vardoulakis et al.
patent: 4885941 (1989-12-01), Vardoulakis et al.
Degtyarenko, G. I. et al. Residual-Stress Measurement . . . Mixtures, Ind. Lab (U.S.A.), vol. 44, No. 6 (Jun. '78) (Pub. Dec. '78) pp. 861-862.

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