A ballistic material model for continuous-fiber reinforced composites

Abstract

a b s t r a c tA ply-level material constitutive model for plain-weave composite laminates has been developed to enable computational analyses of progressive damage/failure in the laminates under high velocity ballistic impact conditions. In this model, failure-initiation criteria and damage evolution laws are introduced to account for the major fiber-failure modes (tensile, compressive, punch shear and crush loading). In addition, two matrices related failure modes (in-plane shear and through the thickness delamination) are also accounted for. These types of fiber and matrix failure modes are commonly observed during a ballistic event. The composite-material model has been implemented within LS-DYNA as a user-defined material subroutine and used successfully to predict the damage and ballistic behavior of composite laminates subjected to various ballistic impact conditions. It is hoped that the availability of this material model will help facilitate the development of composite structures with enhanced ballistic survivability.Published by Elsevier Ltd.

Multi-length Scale Material Model Development for Armorgrade Composites

“…This is demonstrated in Figure 7, in which typical results pertaining to the effect of projectile initial velocity on the projectile residual velocity in the case of the Yen [14] composite material model and its present modification are displayed. It is seen that V 50 (defined here as the projectile initial velocity at which the projectile residual velocity is zero) predicted by the analysis in which the 15 In general, it was found that details regarding the spatial distribution and the temporal evolution of the target material during impact are significantly affected by the modifications made to the original Yen [14] composite material model. 20 Figure 8.…”

“…To address this problem, the results of an extensive set of molecular-level computational analyses carried out in the present work and overviewed earlier, regarding the role of various microstructural/morphological defects on the PPTA fibril/fiber/yarn mechanical properties, are used to upgrade one of the continuum-level material models for fiber-reinforced composites developed by Yen [14] of the Army Research Laboratory, Aberdeen Proving Ground, MD. The results obtained in the upgraded PPTA continuum-level material model [14][15][16][17][18] 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. This is demonstrated in Figure 7, in which typical results pertaining to the effect of projectile initial velocity on the projectile residual velocity in the case of the Yen [14] composite material model and its present modification are displayed.…”

“…The results obtained in the upgraded PPTA continuum-level material model [14][15][16][17][18] 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. This is demonstrated in Figure 7, in which typical results pertaining to the effect of projectile initial velocity on the projectile residual velocity in the case of the Yen [14] composite material model and its present modification are displayed. It is seen that V 50 (defined here as the projectile initial velocity at which the projectile residual velocity is zero) predicted by the analysis in which the 15 In general, it was found that details regarding the spatial distribution and the temporal evolution of the target material during impact are significantly affected by the modifications made to the original Yen [14] composite material model.…”

Probabilistic Failure Analysis of Composite Beams for Optimum Ply Arrangements under Ballistic Impact

“…The fiber failure initiation was modeled using a modified form of Hashin [4] criterion and included the effects of normal stress in the direction of the fiber (σ11) and transverse shear stress (τ13). Numerical analysis of the progressive damage failure model of the laminated composite plate was developed by Yen [5]. In this model, failure initiation and propagation laws were introduced to account for the fiber and matrix failure modes.…”

“…The progressive damage modeling in different modes is used only for deterministic validation study. Once a failure has initiated in the plies the modulus is degraded by using a separate damage variable for unidirectional modes [5]. The probabilistic failure analysis carried out later uses fiber damage initiation model.…”