Simulation of Impact Behavior of a Glass Yarn

Abstract

The issue of impact simulation results from the fact that the impact load is unique and the designed system or element is requested not to fail only once or a small number of loadings. Tests for assessments of the degree of impact protection are expensive and numerous because they require a high probability of impact resistence. In the literature, there are models at the micro level (at fiber level), at the meso level (multi-fiber yarns, several fibers or by evaluating the behavior of the fibers to a monobloc yarn, as is the case with this simulation) and at the macro level (the behavior of element or system is done with some equivalences concerning the material model). This paper presents comparative results of the axis and on the edge of a yarn considered monoblock and isotropic to highlight the differences in the mechanisms of destruction of the yarn and in the evolution of the distribution of equivalent stress, highlighting the differences in the simulation of these two cases explains, at least qualitatively, the differences in the behavior of the panels considered identical.

Failure Investigation of Layered LFT SB1plus Package after Ballistic Tests for Level IIA

“…All projectiles that have the ability to penetrate through the fabric also cause the scratching and/or splitting of the fibers, which favors the appearance of fibrillation, a specific failure of aramid fibers. Figure 15 shows the details of some fibers damaged by fibrillation; there are noticed discontinuities in the fiber and the thinning of the fibrils that supported the load and ruptures of fibrils resulting from tensile and shearing loading (deformed breaks with less deformations, as a cut) during the destruction process. The values for BFS (backface signature) for the LFT SB1plus package are given in Table 1 and are measured according to Ballistic Resistance of Body Armor, NIJ Standard-0101.06 [2] (Figure 16).…”

“…Even if, nowadays, many models and simulations have been reported, from micro [14,15], meso [13,16], to macro [17,18] scales, the tests remain the ultimate and restrictive step in adopting a certain type of individual armor, generally based on aramid fabrics.…”

Exploring Anti-Ballistic Technology Development through Bibliometric Analysis of Scopus Database Records

“…Nevertheless, many individuals continue to uphold faith in the experimental approach, particularly in assessing the dynamic reaction of anti-ballistic impact [48]. However, now, a wide range of models and simulations are available, encompassing macroscopic [49,50], mesoscopic [51,52], microscopic [53,54], and even nanoscale [55] approaches, all of which strive to represent the dynamics of ballistic collisions [56,57] accurately. The final stage in evaluating the efficacy of new materials for protective systems is typically experimental work.…”