ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
This paper illustrates some preliminary experimental, numerical and theoretical analysisresults of mixed mode I-III rock cracks under apparent mode III loading. Some edge notchedgranite specimens are tested under out-of-plane four-points shearing loading condition, i.e., anapparent mode III loading condition. A series finite element analysis was conducted to understandthe mechanism of the crack fracture propagation under this loading condition. The stress intensityfactor distributions along the 3-D crack tips are also obtained. All crack fracture propagationsurfaces of the specimens are similar helicoids which radius can be mainly influenced by theloading patterns, i.e., the action width s. The crack fracture initiates at the midpoint of the crackfront. From the numerical calculation and experimental investigation, it has been revealed that all ofthese crack fracture initiations are caused by maxima tensile stress σ1. Based on this stress σ1, a newfracture criterion of mixed mode I-III is proposed. Its predictions agree well with the experimentresults. This criterion can be applied to practice engineering designs which are related with mixedmode I-III or pure mode III rock crack fracture problems
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1217.pdf
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