Static and dynamic fracture behavior of oil shale

Conference · Thu Jan 01 04:00:00 EST 1981 · Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States)

OSTI ID:6463864

Costin, L S

The fracture toughness of a rich grade of oil shale (high kerogen content) was determined as a function of the loading rate and orientation of the crack with respect to the bedding planes. Several independent test methods were employed in order to attain a wide range of loading rates and to examine the effect of specimen size and configuration on the test resluts. The test methods used in this series of experiments include ASTM Test for Plane-Strain Fracture Toughness of Metallic Materials (E 399 - 78a), the J-resistance curve method, the short rod method, and the instrumented Charpy impact test. The static tests were conducted at a nominal loading rate of 10/sup -2/ MPa. m/sup //one-half/sub s/ using each of the aforementioned first three methods. The dynamic tests were conducted at loading rates in the range of 10/degree/to 10/sup 4/ MPa . m/sup //one-half/sub s/ using both servo-controlled and impact loading of three-point bend specimens. The results from the various static test methods are in good agreement. However, there is a clear effect of both specimen size and crack orientation on the measured static fracture toughness. The results from the dynamic tests show some evidence of a rate effect on fracture toughness as well as the same orientation dependence as the results from the static test, but no specimen size dependence was evident. 16 refs.

• Research Organization: Sandia Natl Lab, Albuquerque, NM, USA
• OSTI ID: 6463864
• Report Number(s): CONF-8006254-
• Conference Information: Journal Name: Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040500* -- Oil Shales & Tar Sands-- Properties & Composition
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHARPY TEST
COMPOSITE MATERIALS
CRACK PROPAGATION
DESTRUCTIVE TESTING
ENERGY SOURCES
FOSSIL FUELS
FRACTURE PROPERTIES
FUELS
IMPACT TESTS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
OIL SHALES
STRAINS
TESTING