期刊
ENGINEERING FRACTURE MECHANICS
卷 102, 期 -, 页码 288-309出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2013.02.009
关键词
Rate effect; Micro-measurements; Fracture toughness; Surface roughness; Failure mechanisms
类别
资金
- Swiss National Science Foundation [200020_129757]
- China Scholarship Council (CSC)
Fracture experiments in a notched semi-circular bend configuration were conducted to characterize rate effects and failure micromechanisms of a marble using a servo-hydraulic machine and a modified split Hopkinson pressure bar. Three real-time measurement techniques were used to estimate crack propagation velocities and full-field deformation fields. Micro-measurement techniques were employed to qualitatively and quantitatively identify micrograph and surface morphology. Based on the theory of fracture mechanics, a micromechanical model was presented to examine the intergranular and transgranular fracture. The results indicated that fracture toughness and surface roughness were dependent on loading rate, which were induced by the intrinsic failure mechanisms. (C) 2013 Elsevier Ltd. All rights reserved.
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