期刊
ENGINEERING FRACTURE MECHANICS
卷 130, 期 -, 页码 21-41出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2014.02.026
关键词
Crack driving force; Configurational forces; Finite element method; Fracture toughness; Crack tip plastic zone
类别
资金
- Austrian Federal Government
- Styrian provincial Government within the research activities of the K2 Competence Center Integrated Research in Materials, Processing and Product Engineering, under the frame of the Austrian COMET Competence Center Program [A4.20-WP1]
It has recently been shown that a strong spatial variation of the Young's modulus can improve greatly the fracture resistance and the fracture strength of an inherently brittle material. In this paper, using numerical modeling and application of the concept of the configurational forces, it is shown that spatial variations of the yield stress can also improve the fracture resistance. The reason is that, when the crack has crossed a soft interlayer, the crack driving force strongly decreases and the crack is arrested by the interlayer; this effect appears without previous delamination of the interlayer. From the numerical results, optimum interlayer configurations are derived, i.e. for a given matrix material and load, the magnitudes of thickness and yield stress of the soft interlayer are determined so that the crack driving force exhibits a minimum. Such optimum configurations can be used for the design especially fracture resistant materials and components. (C) 2014 Elsevier Ltd. All rights reserved.
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