Multi-length Scale Material Model Development for Armorgrade Composites
Final rept. 1 Oct 2009-31 Mar 2014
CLEMSON UNIV SC
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The present work was focused on establishing microstructureproperty relationships in p-phenylene terephthalamide PPTA based materials and structures. A multi-length-scale computational approach has been developed in order to identify and quantify the contribution of various microstructural features and processes, at different length-scales, to the macroscopic-level ballistic-penetration resistance of PPTA-based fabric or PPTA-fiber-reinforced polymer-matrix composites. Specifically, the role of various material-synthesis-fiber-processing-induced defects, as well as defects induced during the weaving process, was investigated. The results obtained clearly revealed that both the static mechanical material properties such as stiffness and strength, and the dynamic-impact properties such as V50, are affected by the type and the concentration of various defects. Lastly, it was demonstrated that in order to construct a high-fidelity continuum-level PPTA-based material constitutive model, the role of the material microstructure including defects at different length-scales must be taken into account.
- Laminates and Composite Materials