An analytical model for the penetration of flat-nosed long rods into semi-infinite concrete targets

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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Abstract

An analytical model is presented herein on the penetration of a flat-nosed long rod into a semi-infinite concrete target based on the previous theoretical studies and experimental observations. The nose shape of the flat-nosed long rod in deformable penetration state is assumed to be a circular arc and the length of plastic region of the long rod in hydrodynamic penetration is taken into account. The behavior of an erosive penetrator is further divided into two penetration stages (namely semi-hydrodynamic penetration and hydrodynamic penetration) and a new critical impact velocity (i.e. erosive velocity) is derived to characterize the beginning/incipient erosion in accordance with plastic wave propagation theory. According to the new theoretical considerations, the relationship of dimensionless instantaneous mushrooming head radius versus impact velocity is rewritten and the method for predicting semi-hydrodynamic penetration tunnel radius is proposed. It transpires that the present model predictions are in good agreement with available experimental results for the penetration of flat-nosed long rods into semi-infinite concrete targets in terms of penetration depth, penetration modes, penetration tunnel size, residual mass and residual length.

平头长杆穿入半无限混凝土目标的分析模型
本文在前人理论研究和实验观测的基础上,提出了平头长杆穿入半无限混凝土靶的分析模型。假定平头长杆在变形穿透状态下的杆头形状为圆弧,并考虑了长杆在流体动力穿透状态下塑性区域的长度。侵蚀性贯穿件的行为进一步分为两个贯穿阶段(即半流体动力贯穿和流体动力贯穿),并根据塑性波传播理论推导出新的临界冲击速度(即侵蚀速度),以表征开始/初始侵蚀。根据新的理论考虑,重写了无量纲瞬时蘑菇头半径与冲击速度的关系,并提出了预测半流体动力穿透隧道半径的方法。结果表明,本模型的预测结果与现有的扁鼻长杆穿透半无限混凝土目标的实验结果在穿透深度、穿透模式、穿透隧道尺寸、残余质量和残余长度等方面都非常吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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