The purpose of this paper is to examine the dynamic three-point bending performance of UHMWPE and PVA fiber concrete specimens by means of density variation (0, 0.6, 1.2, 1.8, 2.4 kg/m³). Additionally, the difference in performance between UHMWPE and PVA fiber concretes, as well as the impact characteristics and the damage evolution law exhibited by these fiber concretes under repeated dynamic loading were studied and discussed. A Split Hopkinson pressure bar (SHPB) apparatus was used to determine the concrete behavior at different strain rates; the accuracy of which was achieved by conducting a structural transient dynamic response analysis. The dynamic failure strength and strain rate of the specimen were derived to investigate the rate effect with different quantities of UHMWPE and PVA fiber concretes. The experimental results were then compared with those predicted from available equations, verifying the validity of the results obtained. A theoretical model for analyzing the transient elastic response of the specimen was then proposed. This paper concludes by proposing an analytical equation for predicting the dynamic compression and tensile properties of these new-type fibers.

本文旨在通过密度变化（0，0.6，1.2，1.8，2.4 kg / m ³来检查UHMWPE和PVA纤维混凝土试样的动态三点弯曲性能）。此外，研究和讨论了UHMWPE和PVA纤维混凝土之间的性能差异，以及这些纤维混凝土在反复动态载荷下表现出的冲击特性和损伤演化规律。使用分体式霍普金森压力棒（SHPB）设备确定不同应变率下的混凝土性能。其准确性是通过进行结构瞬态动力响应分析来实现的。推导了试样的动态破坏强度和应变速率，以研究不同数量的UHMWPE和PVA纤维混凝土的速率效应。然后将实验结果与从可用方程式预测的结果进行比较，验证所获得结果的有效性。然后提出了用于分析试样瞬态弹性响应的理论模型。本文通过提出一个解析方程式来预测这些新型纤维的动态压缩和拉伸性能。