Modified ring test

Details Modified ring test Modified ring test

1987-06-22

1989-04-18

LaRoche, Eugene R.

Measuring and testing

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

By loading of specimen

73153, 73818, G01N 1908

Patent

active

048215775

ABSTRACT:
A novel test specimen configuration and modified ring test method for determining the fracture toughness, K.sub.Ic, using rock core is disclosed. The use of a truncated hollow cylindrical specimen under compressive load avoids the development of a large process zone (microcracked region) during testing, thus allowing accurate fracture toughness measurements on subsized specimens. Results using soft sandstones and Indiana limestone validate the procedure.

REFERENCES:
patent: 3693419 (1972-09-01), De Pierre et al.
patent: 4075886 (1978-02-01), Barker
patent: 4116049 (1978-09-01), Barker
patent: 4152941 (1979-05-01), Abou-Sayed et al.
patent: 4562736 (1986-01-01), Iwasaki et al.

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