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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 2    April 2001

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Is crack branching under shear loading caused by shear fracture?
--A critical review on maximum circumferential stress theory
SUN Zong-qi(孙宗颀)

College of Resource, Environment and Civil Engineering,
Central South University, Changsha 410083, P.R.China

Abstract:When a crack is subjected to shear force, crack branching usually occurs. Theoretical study shows that the crack branching under shear loading is caused by tensile stress, but not caused by shear fracture. The co-plane shear fracture could be obtained if compressive stress with given direction is applied to the specimen, subsequently, calculated shear fracture toughness, KC , is larger than KC . A prerequisite of possible occurrence of mode Ⅱ fracture was proposed. The study of shear fracture shows that the maximum circumferential stress theory considered its criterion as a parametric equation of a curve in K,K plane is incorrect; the predicted ratio KC /KC=0.866 is incorrect too.

 

Key words: stress intensity factor; fracture toughness; mode of fracture; mode of loading

ISSN 1672-7029
CN 43-1423/U

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