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Quantitative fractography of mixed mode fracture in glass and ceramics |
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| Affiliation: | 1. National Technical University of Ukraine “Kiev Polytechnic University”, 35 Polytechnichna str., Kiev 03056, Ukraine;2. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky str., Kiev 03142, Ukraine;1. Thin Film Physics Department, Institute for Technical Physics and Materials Science, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Konkoly-Thege M. Str. 29-33, 1121 Budapest, Hungary;2. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, HAS, Konkoly-Thege M. Str. 29-33, 1121 Budapest, Hungary;3. Department of Materials Physics, Eötvös Loránd University, P.O.B. 32, 1518 Budapest, Hungary;1. Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Area della Ricerca Roma1, 00015 Monterotondo Scalo, Roma, Italy;2. Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany;3. Dipartimento SIMAU, Università Politecnica delle Marche, 60131 Ancona, Italy;4. Dipartimento di Fisica, Università di Bologna and CNISM, I-40127 Bologna, Italy |
| Abstract: | Many ceramic structural applications involve a combination of tensile (mode I) and shear (mode II) loading conditions. Quantitative fractography was performed on monolithic and R-curve materials. Soda-lime-silica glass was selected as the monolithic material. A mica glass ceramic was selected to represent R-curve materials. Mixed-mode fracture surfaces in both materials were characterized by an absence of the mist region. For the mica glass ceramic, crack-to-mirror size ratios were found to be a function of the crack length and mode mixity. Hackle markings on mixed-mode fracture surfaces appear as lances and differ from those observed on surfaces failed in pure Mode I. Atomic force microscopy showed that the features in different regions on the mixed-mode fracture surfaces are similar and differ only by scale. The practical implications of these observations are that forensic analyses can be used without a priori knowledge of the loading conditions. |
| Keywords: | Fractography Mixed mode fracture Failure analysis Atomic force microscopy Hackle |
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