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• 454 Downloads • Abstract Fiber-reinforced polymer matrix composite materials display quite complex deformation and failure behavior under ballistic/blast impact loading conditions. This complexity is generally attributed to a number of factors such as (a) hierarchical/multi-length scale architecture of the material microstructure; (b) nonlinear, rate-dependent and often pressure-sensitive mechanical response; and (c) the interplay of various intrinsic phenomena and processes such as fiber twisting, interfiber friction/sliding, etc. 3 Games That Use A Dance Paducah on this page. Material models currently employed in the computational engineering analyses of ballistic/blast impact protective structures made of this type of material do not generally include many of the aforementioned aspects of the material dynamic behavior.

Consequently, discrepancies are often observed between computational predictions and their experimental counterparts. To address this problem, the results of an extensive set of molecular-level computational analyses regarding the role of various microstructural/morphological defects on the Kevlar ® fiber mechanical properties are used to upgrade one of the existing continuum-level material models for fiber-reinforced composites. The results obtained show that the response of the material is significantly affected as a result of the incorporation of microstructural effects both under quasi-static simple mechanical testing condition and under dynamic ballistic-impact conditions.

Acknowledgments The material presented in this article is based on research supported by the Army Research Office (ARO) research contract entitled “ Multi- length-scale Material Model Development for Armor- grade Composites” (Contract Number W911NF-09-1-0513) and the Army Research Laboratory (ARL) research contract entitled “ Computational Analysis and Modeling of Various Phenomena Accompanying Detonation Explosives Shallow- Buried in Soil” (Contract Number W911NF-06-2-0042). The authors are indebted to Dr. Larry Russell of ARO for his continuous support and interest during the above study.