Authors
Shu Liu, Yuh J Chao, Xiankui Zhu
Publication date
2004/11/1
Journal
International Journal of Solids and Structures
Volume
41
Issue
22-23
Pages
6147-6172
Publisher
Pergamon
Description
The propensity of the transition of fracture type in either brittle or ductile cracked solid under mixed-mode I and III loading conditions is investigated. A fracture criterion based on the competition of the maximum normal stress and maximum shear stress is utilized. The prediction of the fracture type is determined by comparing τmax/σmax at a critical distance from the crack tip to the material strength ratio τC/σC, i.e., (τmax/σmax)<(τC/σC) for tensile fracture and (τmax/σmax)>(τC/σC) for shear fracture, where σC (τC) is the fracture strength of materials in tension (shear). Mixed mode I/III fracture tests were performed using circumferentially notched cylindrical bars made of PMMA and 7050 aluminum alloy. Fracture surface morphology of the specimens reveals that: (1) for the brittle material, PMMA, only tensile type of fracture occurs, and (2) for the ductile material, 7050 aluminum alloy, either tensile or shear type of fracture …
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Scholar articles
S Liu, YJ Chao, X Zhu - International Journal of Solids and Structures, 2004