期刊
ENGINEERING FRACTURE MECHANICS
卷 93, 期 -, 页码 189-203出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2012.06.018
关键词
Fracture initiation; Mixed mode; Ductile fracture; Strain detection; Energy release rate
类别
资金
- National University of Singapore
This study investigates the initiation of mixed-mode crack extensions in four-point bend and shear specimens fabricated from aluminum alloys. The determination of fracture initiation utilizes a new strain detection method, which provides a uniform criterion for specimens over the complete mixed-mode I-II loading range. The 0.2 mm offset method for mode I specimens and the physical features on the fracture surface of mode II dominant specimens validate this method. The total measured fracture toughness shows a minimum value for the pure mode I case, a maximum for the pure mode II case and an oscillated trend over the mixed-mode I-II loads. (C) 2012 Elsevier Ltd. All rights reserved.
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