期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 47, 期 16, 页码 2123-2130出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2010.04.012
关键词
Equivalent thickness; Out-of-plane constraint; Corner crack; Three-dimensional fracture; Through-the-thickness crack
类别
资金
- National Natural Science Foundation of China [50805079]
- Aeronautic Science Foundation of China [2007ZA52011, 2008ZF52062]
- Research Startup Fund of Nanjing University of Aeronautics and Astronautics [50872-GXY]
Thickness dependence of the one-parameter-based fracture toughness has been well recognized and widely studied. However, it is still a challenge to predict the fracture of structures with curved cracks from the fracture toughness data obtained from the standard through-the-thickness cracked specimens. The complicated three-dimensional (3D) stress fields near the crack front play a vital role in the fracture strength of materials. Based on a systematical numerical study of the 3D stress fields near the crack tip of quarter elliptic corner cracks and comparison with that of ideal through-the-thickness cracks, an equivalent thickness conception for curved cracks is proposed from the viewpoint of out-of-plane constraint, and a semi-analytical solution for the equivalent thickness of corner cracks is obtained. With the evaluated equivalent thickness, the fracture toughness of corner cracked specimens is predicted efficiently by the plane-strain toughness value of the material obtained from the standard through-the-thickness specimen. (C) 2010 Elsevier Ltd. All rights reserved.
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