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Title: Crack propagation from 3-D surface fractures in PMMA and marble specimens under uniaxial compression
Authors: Wong, RHC
Law, CM
Chau, KT 
Zhu, WS
Keywords: Compressive crack
Marble specimen
Petal crack
PMMA specimen
Secondary crack
Wing crack
Issue Date: 2004
Publisher: Pergamon Press
Source: International journal of rock mechanics and mining sciences, 2004, v. 41, no. SUPPL. 1, p. 37-42 How to cite?
Journal: International journal of rock mechanics and mining sciences 
Abstract: This paper studies crack propagation emanating from pre-existing three-dimensional surface fracture (or flaw) in marble and PMMA of different flaw depths 'd' and flaw angles 'α'. From the experimental studies, the following conclusions were drawn: (1) Both tensile crack and petal crack may initiate form flaw tip in both PMMA and marble specimens; (2) Shell-like crack may initiate from the flaw tip of both PMMA and marble specimens at α=60°, (3) The length of crack propagation depends on the d/t (where t is the thickness of the specimen), a and the type of material used. Growth of wing crack is observed when d/t>0.1 in marble or d/t>0.3 in PMMA. When the specimen is relatively thin (i.e. d/t>0.3), wing crack propagates through the whole thickness for both PMMA and marble specimens. When α<45>, no wing crack initiation is observed in both PMMA and marble specimens; (4) The failure mechanism for PMMA specimens seems to closely resemble that for marble specimens.
ISSN: 1365-1609
EISSN: 1873-4545
DOI: 10.1016/j.ijrmms.2004.03.016
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