混凝土板上刚性射弹穿孔的改进型基于粘接的周动力方法

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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引用次数: 0

摘要

周动态(PD)在描述脆性材料的裂缝生长和破碎方面具有独特的优势。针对混凝土板在弹丸穿孔下的动态行为和破坏模式,首先从以下三个方面开发了一种基于粘结的改进型 PD 方法,该方法既保持了易于实施的特点,又保持了计算的稳定性:(i) 提出了一种依赖速率的 PD 构成模型,用于描述混凝土的动态行为;(iii) 引入与粘结长度相关的改进微模量函数,以揭示粘结力的内部长度效应。然后,利用所开发的基于粘结力的改进型 PD 方法对混凝土板上的弹丸穿孔进行了数值模拟,并对包括水平线尺寸和颗粒间距在内的离散化参数进行了相应的敏感性分析。根据推荐的水平线尺寸和颗粒间距,预测的弹丸残余速度和混凝土板的破坏模式与试验数据非常吻合。此外,通过比较传统的基于粘结的预测破坏方法和经典的有限元方法,证明了所开发的方法在描述混凝土目标在弹丸冲击下的穿孔破坏方面的优越性。最后,采用改进的基于粘结的 PD 方法对射弹法向和斜向穿透多层间隔混凝土靶板进行了盲模拟。结果发现,改进后的 PD 模型合理地预测了弹丸的末端弹道、偏转角和残余速度,以及靶板的破坏模式。本研究为预测弹丸的末端弹道效应和混凝土板的动态行为提供了一种新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A modified bond-based peridynamic approach for rigid projectile perforation on concrete slabs

Peridynamic (PD) has a unique advantage in describing the crack growth and fragmentation of brittle materials. Concerning the dynamic behaviors and failure patterns of concrete slabs under projectile perforations, a modified bond-based PD approach maintaining both the easy implementation and computational stability characteristics was firstly developed from the following three aspects, (i) a rate-dependent PD constitutive model was proposed for describing the dynamic behaviors of concrete; (ii) a progressive damage criterion considering the tension-compression anisotropy, softening behavior, and strain rate effect of concrete was incorporated to more accurately reproduce the damage and failure of concrete; (iii) an improved micro-modulus function related to bond length was introduced to reveal the internal length effect of bond force. Then, numerical simulations of projectile perforation on concrete slabs by utilizing the developed modified bond-based PD approach, as well as the corresponding sensitivity analyses of discretization parameters including horizon size and particle spacing were performed. Based on the recommended horizon size and particle spacing, the predicted residual velocity of projectile and failure patterns of concrete slabs exhibited an excellent agreement with the test data. Furthermore, by comparisons of the traditional bond-based PD and classical finite element methods, the superiority of developed approach in describing the perforation damage of concrete targets against projectile impact was demonstrated. Finally, the modified bond-based PD approach was employed to blind simulate the projectile normal and oblique perforating multi-layered spaced concrete target plates. It was found that the modified PD model reasonably predicted the terminal ballistic trajectory, deflection angle, and residual velocity of projectile, as well as the failure patterns of target plates. The present work provides a new way to predict the terminal ballistic effect of projectile and dynamic behaviors of concrete slabs.

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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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