Experimental determination of silica/copper interfacial toughness |
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| Affiliation: | 1. Department of Materials Science and Engineering, Institute of Space Technology, Islamabad 44000, Pakistan;2. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Luoyu Road No. 1037, Wuhan, China;3. Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan;1. Centre of Excellence for Green Energy and Sensor Systems (CEGESS), Indian Institute of Engineering Science and Technology (IIEST), Shibpur, Howrah – 711103, West Bengal, India;2. Separation and Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, Mol 2400, Belgium;1. Ecole normale supérieure, PSL Research University, UPMC Univ Paris 06, CNRS, Département de Chimie, PASTEUR, 24, rue Lhomond, 75005 Paris, France;2. Sorbonne Universités, UPMC Univ Paris 06, ENS, CNRS, PASTEUR, 75005 Paris, France;3. Current address: School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia;4. Laboratoire de physiologie membranaire et moléculaire du chloroplaste, CNRS, UPMC UMR 7141, I.B.PC., 13 rue Pierre et Marie Curie, 75005 Paris, France |
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| Abstract: | Experiments designed to measure the fracture toughness of ceramic-metal interfaces over a wide range of phase angles are described, and a simple approach to data analysis accounting for plasticity effects in specifying interfacial toughness is outlined. A modified version of a fixture proposed by Richard and Benitz [Int. J. Fract.22, R55 (1983)] is used to apply mixed-mode loadings to silica/copper sandwich specimens. The experimentally observed crack trajectories depend on the phase angle of loading. In general, the tendency for initial propagation of the crack to occur in the ceramic increases as the magnitude of the phase angle increases. The introduction of a modest amount of mixed-mode loading resulted in a substantial increase in fracture toughness, from approximately 2.2 J/m2 at 3° to 6.4 J/m2 at 16° and 8.7 J/m2 at −10°. The data clearly indicate that plasticity effects become increasingly important as the magnitude of the phase angle increases. |
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