A methodology for the estimation of transverse failure strength of an oxidized lamina from isothermal aging studies |
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| Affiliation: | 1. Government College University Faisalabad, Faisalabad, Pakistan;2. Bahauddin Zakariya University, Multan, Pakistan;2. University of Iceland, Reykjavik, Iceland;1. Government College University Faisalabad, Faisalabad, Pakistan;2. Iran Polymer & Petrochemical Institute, Tehran, Iran;3. North Dakota State University, Fargo, ND, United States;1. Institute of Health Sciences, RENORBIO, Federal University of Bahia, Salvador, Bahia, Brazil;2. Federal University of the Recôncavo of Bahia, Feira de Santana, Bahia, Brazil;3. Federal Institute of Baiano, Santa Inês, Bahia, Brazil;4. Laboratory of Biochemical Engineering, College of Chemistry and Food Engineering, Federal University of Rio Grande, Rio Grande, Brazil;5. Department of Bromatological Analysis, College of Pharmacy, Federal University of Bahia, Salvador, Bahia, Brazil;1. Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok 10900, Thailand;2. Center for Advanced Studies for Agriculture and Food, Kasetsart University Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand;3. Duckweed Holobiont Resource & Research Center (DHbRC), Kasetsart University, Thailand |
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| Abstract: | Surface oxidation and ensuing damage substantially decrease the service life of High Temperature Polymer Matrix Composite (HTPMC) structures. Oxidative degradation behavior of composites is strongly dependent on the coupling between chemical and mechanical responses of the material. In a composite lamina, the onset of damage and subsequent coupled acceleration of both damage and oxidation are controlled by the transverse failure strength of the oxidized regions. The direct measurement of this strength from experimentation is challenging and cumbersome. A model-based methodology for estimating the mean transverse failure strength of the oxidized regions of a unidirectional composite is described in this paper. As the strength of the oxidized region is expected to show a high-degree of spatial variability, the estimated mean is shown to be relatively insensitive to the effect of strength variance. The developed methodology is illustrated with isothermal aging data available for a typical high-temperature composite system. |
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| Keywords: | B Environmental degradation B Strength C Damage mechanics Oxidation |
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