Numerical multi-scale modeling for textile woven fabric against ballistic impact
Résumé
In this study, a FEM analysis has been carried out to find out pertinent multi scale model for an investigation of a ballistic impact on 2D KM2® plain woven fabrics. Multi scale models are a combination between macroscopic and mesoscopic models. This study aims at testing a multi scalec model in order to minimize the computing time. Three configurations were analyzed by varying the ratio of macroscopic and mesoscopic areas: 75.3-24.7%, 65.5-34.5%, 56.3-43.7% with two impact velocities 60 m/s and 245 m/s. In these multi scale models, the continuity in macroscopic-mesoscopic interfaces is ensured by checking the evolution of global displacements of the fabric during impact. The effect of the macroscopic area of multi scale models on the ballistic performance of the fabric is also investigated. The optimal multi scale model was validated by comparison with results obtained from a mesoscopic model in terms of the evolutions of the projectile velocity, energy forms, the overall behavior of the fabric during impact and the force applied on the projectile. The failure criterion Forming Limited Diagram (FLD) is suggested for bundle failure. The observed damage mechanisms of the fabric during penetration time of the projectile are discussed and compared among numerical models.