期刊
ENGINEERING FRACTURE MECHANICS
卷 76, 期 9, 页码 1268-1276出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2009.02.001
关键词
Dynamic fracture mechanics; Dynamic initiation toughness; Dynamic propagation toughness; Fracture velocity
类别
资金
- NSERC [72031326]
- China Scholarship Council
- US Department of Energy [DE-AC52-06NA25396]
Fracture initiation toughness, fracture energy, fracture propagation toughness, and fracture velocity are key dynamic fracture parameters. We propose a method to simultaneously measure these parameters for mode-l fractures in split Hopkinson pressure bar (SHPB) testing with a notched semi-circular bend (SCB) specimen. The initiation toughness is obtained from the peak load given dynamic force equilibrium. A laser gap gauge (LGG) is developed to monitor the crack surface opening displacement (CSOD) of the specimen, from which the fracture velocity and the fracture energy can be calculated. The feasibility of this methodology for coarse-grained solids is demonstrated with the SHPB-SCB experiments on Laurentian granite. (C) 2009 Elsevier Ltd. All rights reserved.
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