Effect of Material Variability on Multiscale Modeling of Rate-Dependent Composite Materials
Publication: Journal of Aerospace Engineering
Volume 28, Issue 6
Abstract
The effects of material variability on the mechanical response and failure of composites under high strain rate and impact loading are investigated in this paper. A previously developed strain rate–dependent, sectional micromechanics model is extended to account for the variability in microstructure and constituent material properties. The model presented in this paper also includes a three-dimensional damage law based on a work potential theory and a microscale failure criterion. Microstructural characterization of the composite is performed to obtain the statistical distributions needed for the stochastic methodologies. A Latin hypercube sampling technique is used to model the uncertainties in fiber volume fraction and viscoplastic material constants. A comparison of general Monte Carlo simulation and Latin hypercube–based Monte Carlo shows that the Latin hypercube technique converges using fewer simulations. The modulus and failure strain obtained using the developed methodology show good correlation with the experimental data. This novel stochastic sectional model is shown to correlate better with the available experimental data compared with the deterministic sectional model. A laminate level, parametric study is also conducted to investigate the effect of uncertainty on the residual energy of a composite laminate during impact.
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Acknowledgments
This research is supported by the U.S. Army Research Office (Grant No. W911NF-12-1-0353), program manager Dr. Asher Rubinstein. The authors also thank Dr. Robert Goldberg (NASA Glenn Research Center) for his valuable feedback.
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Published In
Journal of Aerospace Engineering
Volume 28 • Issue 6 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 1, 2014
Accepted: Jan 12, 2015
Published online: Feb 17, 2015
Discussion open until: Jul 17, 2015
Published in print: Nov 1, 2015
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