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Resistance of Multi-Layered UHPFRC against in-service projectile: Experimental Investigation and Modelling Prediction
Composite Structures ( IF 6.3 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.compstruct.2020.112295
Y.Y.Y. Cao , P.P. Li , H.J.H. Brouwers , Q.L. Yu

Abstract The present paper studies the ballistic performance of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) applying multi-layered concept against the 7.62 mm projectile at 840 m/s. Coarse basalt aggregates are incorporated in the UHPFRC under the premise of reducing the cement powder consumption and taking advantages of their superior ballistic resistance. We found that the designed triple-layered UHPFRC 16a1s(40)-8a1s(10)-16a1s(40) achieves a superior impact resistance compared to the single-layered reference, with a 32% reduction of the penetration depth. The improved resistance of the triple-layered UHPFRC is associated with the multiple effects of the coarse aggregate, the layer interface, the fibers direction in the thin middle layer, and the edge confinement of the rear layer. Moreover, a new analytical model is proposed to predict the penetration depth in the multi-layered UHFRC, which can take the varying mechanical properties of the layered targets into consideration. The results from this study shed light on understanding the ballistic performance of layered UHPFRC, and promote its application in protective constructions.

中文翻译:

多层 UHPFRC 对在役弹丸的抵抗力:实验研究和建模预测

摘要 本文研究了应用多层概念的超高性能纤维增强混凝土(UHPFRC)对840 m/s 的7.62 mm 弹丸的弹道性能。UHPFRC中加入粗玄武岩骨料,在减少水泥粉用量的前提下,利用其优越的抗冲击性。我们发现,与单层参考相比,设计的三层 UHPFRC 16a1s(40)-8a1s(10)-16a1s(40) 实现了优异的抗冲击性,穿透深度降低了 32%。三层 UHPFRC 提高的阻力与粗骨料、层界面、薄中间层的纤维方向和后层边缘限制的多重效应有关。而且,提出了一种新的分析模型来预测多层 UHFRC 中的穿透深度,该模型可以考虑分层目标的不同机械性能。这项研究的结果有助于了解层状 UHPFRC 的弹道性能,并促进其在防护结构中的应用。
更新日期:2020-07-01
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