Finite element modeling of ballistic impact on Kevlar 49 fabrics

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


This paper presents an improved material model suitable for Kevlar 49 fabric which was implemented into the commercial explicit Finite Element (FE) software LS-DYNA through a user defined material subroutine (UMAT). The fabric constitutive behavior in the current material model was obtained from new experimental data in the principal material directions (warp and fill) under static loading. Two different modeling configurations, i.e. single FE layer and multiple FE layers were used to simulate the ballistic tests conducted at NASA Glenn research center. Both the shear properties of the fabric and the parameters used in Cowper-Symonds (CS) model which accounts for strain rate effect on material properties were optimized to achieve close match between the FE simulations and experimental data. The residual velocity of the projectile, the absorbed energy by the fabric after impact, and the temporal evolution and the spatial distribution of the fabric deformation and damage were closely examined. Sensitivity analysis was carried out to study the effect of the failure strain of the fabric and the coefficient of friction on the simulation results.

Original languageEnglish (US)
Title of host publicationDynamic Behavior of Materials - Proceedings of the 2011 Annual Conference on Experimental and Applied Mechanics
Number of pages10
StatePublished - Dec 1 2011
Event2011 SEM Annual Conference on Experimental and Applied Mechanics - Uncasville, CT, United States
Duration: Jun 13 2011Jun 16 2011

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Other2011 SEM Annual Conference on Experimental and Applied Mechanics
Country/TerritoryUnited States
CityUncasville, CT


  • Ballistic impact
  • Finite element model
  • Kevlar fabric
  • Strain rate effect

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering


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