Fracture surface energy of olivine |
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| Authors: | M V Swain B K Atkinson |
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| Institution: | (1) Physics and Chemistry of Solids, Cavendish Laboratory, University of Cambridge, Madingley Road, CB3 0HE Cambridge, UK;(2) Department of Geology, Imperial College of Science and Technology, South Kensington, SW7 2BP London, UK |
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| Abstract: | A relatively simple indentation technique for the rapid measurement of fracture surface energy,  , of small samples is described. The reliability of this technique is assessed by testing soda-lime glass for which there are good independent fracture mechanics determinations of fracture surface energy. The indentation technique gives a value for of 4.33 J m–2 which compares favourably with the accepted value of 3.8 J m–2. Fracture surface energies of the {010} and {001} cleavage planes of single crystal olivine (modal composition Fo88Fa12) are then determined and compared with theoretical estimates of the thermodynamic surface energy,  , calculated from atomistic parameters ( is equal to in the absence of dissipative processes during crack extension). The experimental values for  {010} and {001} are respectively 0.98 J m–2 and 1.26 J m–2. The calculated values of {010} and {001} are respectively in the range from 0.37 J m–2 to 8.63 J m–2 and 12.06 J m–2. The particular advantages of the indentation technique for the study of the fracture surface energies of geological materials are outlined. |
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| Keywords: | Fracture energy Identation of minerals Rock mechanics |
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