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Fracture toughness of coal under quasi-static and impact loading

✍ Scribed by J.R. Klepaczko; M.N. Bassim; T.R. Hsu

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
830 KB
Volume
19
Category
Article
ISSN
0013-7944

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✦ Synopsis

The fracture toughness of specimens of Canadian coal, expressed as KQ, was determined under both quasi-static and dynamic loading conditions. In all tests, a wedge loaded compact tension (WLCT) specimen was used. The quasi-static tests were carried out in a servohydraulic testing machine while in the dynamic testing, a Split Hopkinson Bar was used. Also studied was t& effect of orientation of the crack with respect to the coal seam. Loading rates ranging from 0.1 MPa dmlsec. to 6 x lo4 MPa dmlsec. were investigated. The results show a large increase of over one order of magnitude between Ko in the quasi-static and that obtained at high loading rates.

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