Abstract
It has been reported that the ply gap influences the ballistic resistance of spaced multi-ply fabric systems,but its working mechanism was not well-understood.This paper reports the experimental and numerical approaches and results of an investigation on the mechanisms that enable the improved ballistic per-formance of spaced multi-ply systems.Penetration tests were performed over a range of impact veloc-ities ranging from 200 m/s to 400 m/s.The results confirmed that the ply gap is beneficial to the energy absorption capability of the systems.This is because the front plies tend to absorb more energy when they are not immediately constrained by the rear plies.During a ballistic event,the gap relieves the reflection of the compressive pulse,prolonging the projectile engagement time with the front plies;on the other hand,the rear plies become increasingly less active in dissipating energy as the gap increases.When the gap is sufficiently widened to avoid any interference between the plies before the failure of the front ply,the responses of the whole system no longer vary.It was also found that the ballistic perfor-mance of the spaced systems is influenced by ply thickness,impact velocity,and the stacking order of the ply gap.
基金项目
国家自然科学基金(51708553)
国家自然科学基金(12202498)
国家自然科学基金(52371299)
国家自然科学基金(12302187)
江苏省自然科学基金(BK20210438)
Knowledge Innovation Program of Wuhan-Shuguang Project(202201080102)
万方数据