Process for measuring the fracture toughness of rock under simul

Details Process for measuring the fracture toughness of rock under simul Process for measuring the fracture toughness of rock under simul

1978-05-08

1979-05-08

Myracle, Jerry W.

Measuring and testing

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

By loading of specimen

73804, G01N 312

Patent

active

041529413

ABSTRACT:
The present invention relates to a method for measuring the fracture toughness of rock as it would exhibit in its natural down-hole setting. Practicing the method of the present invention involves internally pressurizing a rock specimen while simultaneously exerting an increasing external horizontal stress thereon, raising simultaneously the internal pressure to maintain a desired relationship of exterior to interior pressures until the specimen fractures, which pressure, in relationship to the stress intensity factor and specimen geometry, provides the specimen fracture toughness as it would exist in a down-hole situation.

REFERENCES:
patent: 3199341 (1965-10-01), Heuer, Jr. et al.
patent: 3580334 (1971-05-01), Broussard et al.

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