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Compression induced shear damage in brittle solids by scattered microcracking

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タイトル: Compression induced shear damage in brittle solids by scattered microcracking
著者: Saimoto, Akihide / Toyota, Akira / Imai, Yasufumi
発行日: 2009年 5月
引用: International Journal of Fracture, 157(1-2), pp.101-108; 2009
抄録: Failure observation and numerical analysis were conducted to understand how shear damage develops in brittle solids under biaxial compression. A biaxial compression often induces shear damaged in brittle solids, which is preceded by a formation of huge number of array cracks. Cracks in the array appeared gradually as applied compression increased. They were almost similar in shape; gently curved but were possible to approximate a troop of straight cracks almost parallel to each other without loss of essential characteristics. Under a uniaxial compression, a brittle material tends to fail exhibiting a crack growth almost parallel to the loading axis. In this situation, the crack propagates rather in a stable fashion since the stress intensity factor at crack tip generally decreases with crack extension. Under a biaxial compression, however, such a stable crack growth is strongly inhibited. Consequently, an array of microcracks often appears as a presage of the macroscopic shear failure. A mechanism of the appearance of damaged zone with increase of applied compression was discussed using a scattered cracking model. It was found that each crack composing the damaged zone has a possibility to open due to crack-to-crack interaction and a localized tensile stress appeared both in the interior and in the exterior of the damaged zone. The localized tension appeared in the interior of the damaged zone may increase a crack density, while that appeared in the exterior of the damaged zone would bring an enlargement of the damaged zone.
キーワード: Brittle fracture / Linear elasticity / Compression induced fracture / Scattered cracking / Stress intensity factor / Damage modeling / Body force method
URI: http://hdl.handle.net/10069/22181
ISSN: 03769429
DOI: 10.1007/s10704-008-9296-1
権利: © Springer Science+Business Media B.V. 2008. / The original publication is available at www.springerlink.com
資料タイプ: Journal Article
原稿種類: author
出現コレクション:060 学術雑誌論文

引用URI : http://hdl.handle.net/10069/22181



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