Virtual specimens for analyzing strain distributions in textile ceramic composites |
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| Affiliation: | 1. Sir Lawrence Wackett Aerospace Research Centre, School of Engineering, RMIT University, Melbourne, VIC, Australia;2. Materials Department, University of California, Santa Barbara, CA, USA;3. Arachne Consulting, Sherman Oaks, CA, USA;1. Arachne Consulting, Sherman Oaks, CA, USA;2. Teledyne Scientific Co LLC, Thousand Oaks, CA, USA;1. Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, USA;2. Department of Mechanical Engineering, Southern University, Baton Rouge, LA 70813, USA;3. Department of Civil Engineering and Engineering Mechanics, Columbia University, NY, USA;4. Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK;1. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, PR China;2. Shaanxi Key Laboratory of Impact Dynamics and its Engineering Application (IDEA), Northwestern Polytechnical University, Xi’an 710072, PR China;3. Joint International Research Laboratory of Impact Dynamics and its Engineering Application, Northwestern Polytechnical University, Xi’an 710072, PR China;4. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China |
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| Abstract: | Methods are presented for calibrating the local elastic properties of tow-scale material domains in virtual specimens of textile composites. A model of the tow geometry is calibrated using 3D tomographic data via previously published methods. The local elasticity is defined to vary with the local tow orientation and fiber volume fraction within tows. The accuracy of the tow geometry is assessed by comparing the surface geometry of virtual specimens with an alternative data source, viz. topographical data obtained by digital image correlation. Calibration of the elastic constants is validated by comparing measured surface strain distributions with computed strain distributions. An approach is also presented for extending the model to the non-linear regime, by simulating the response of virtual specimens in which the bonds between abutting tows are broken and the resulting fracture surfaces are frictionless. The latter results yield a better match to the measured strain distributions. |
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| Keywords: | A Fabrics/textiles C Computational modeling B Mechanical properties D Surface analysis |
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