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Indexed by:期刊论文

Date of Publication:2011-07-01

Journal:ENGINEERING FRACTURE MECHANICS

Included Journals:SCIE、EI

Volume:78

Issue:10

Page Number:2115-2138

ISSN No.:0013-7944

Key Words:Double-K fracture toughness parameters; Concrete; Five evaluation approaches; Size effect

Abstract:The current paper presents a comprehensive comparison of double-K fracture toughness parameters of concrete evaluated using experimental method and four existing analytical methods. Fracture tests were carried out on compact tension wedge splitting specimens with various depths varying from 200 mm up to 1000 mm. In the analytical calculation, depending on the relationship between critical crack tip opening displacement and the abscissa value of turning point on bilinear softening curve, two different distributions of cohesive stress are considered along crack extension. Results show that four available analytical calculations yield almost the same values of double-K fracture toughness parameters and agree well with those obtained from the experiment, which confirms the consistency of five approaches. Size effect was discussed, including unstable fracture toughness, initiation fracture toughness, critical effective crack length, the length of critical fracture process zone and critical crack tip opening displacement. (C) 2011 Elsevier Ltd. All rights reserved.