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Experimental
investigations of spontaneous bimaterial interfacial
fractures
Kaiwen Xia, Carl-Ernst Rousseau and Ares Rosakis |
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Vol. 3 (2008), No. 1, 173–184
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Abstract |
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Following our innovative experimental spontaneous fracture models for frictional fractures (compression and shear) and mixed-mode fractures (tension and shear) in identical materials, we designed a laboratory model to investigate the effects of material contrast on mixed-mode spontaneous fracture along a bimaterial interface. A series of interesting phenomena are observed, including asymmetry of crack propagation, with different speeds and levels of fracture parameters. Crack tips fracture parameters are observed to depend on crack speeds, on far-field loading, and on far-field mode-mixity. A strong dependence is also identified between mode-mixity and crack length. Most importantly, the fracture parameters are found to exhibit a strong dependence upon crack length and only a weak dependence on crack speed as is commonly thought. These observations are discussed in details in relation to material contrast. It is expected that these observations will have a profound influence on engineering practice involving the application of materials and structures with bimaterial interfaces. |
Keywords
spontaneous dynamic fracture, bimaterial interfacial
fracture, stress intensity factor, photoelasticity
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Milestones
Received: 8 April 2007
Revised: 19 July 2007
Accepted: 23 July 2007
Published: 11 March 2008
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Authors |
| Kaiwen Xia | |
| Department of Civil
Engineering University of Toronto 35 St. George Street Toronto ON M5S 1A4 Canada |
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| Carl-Ernst Rousseau | |
| 222-B Wales Hall Dept. of Mechanical Engineering University of Rhode Island Kingston, RI 02881 United States |
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| Ares Rosakis | |
| Graduate Aeronautical
Laboratory California Institute of Technology Pasadena, CA 91125 United States |
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