动能弹丸穿透混凝土的实验和三维介观数值模拟研究

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

摘要

混凝土是一种由砂浆、骨料和界面过渡区(ITZ)组成的多相复合材料。混凝土的中观成分对其抗穿透性能有重要影响。在本研究中,进行了一系列大口径椭圆鼻射弹穿透混凝土目标的穿透实验。试验结果表明,对混凝土目标的破坏包括弹坑区和隧道区,并且随着冲击速度的增加而增加。然后,根据有限元序列号的排列特征,提出了一种局部背景网格方法来建立混凝土的三维网格模型。与传统的三维网格混凝土建模方法相比,所提出的方法能有效提高建模效率。随后,基于三维网格模型进行了数值模拟,模拟结果与实验结果吻合良好,验证了模型的有效性。最后,利用经过验证的三维介观模型研究了混凝土骨料的形状、体积分数、尺寸间隔和强度对弹丸穿透深度(DOP)和挠度的影响。模拟结果表明,骨料的形状对单轴抗压强度和 DOP 的影响微乎其微。因此,使用球形骨料可提高建模效率。提高骨料的体积分数和强度可以显著提高混凝土的抗渗透性能。骨料粒径间隔对 DOP 的影响很小,但在骨料体积分数相同的情况下,对弹丸和弹道挠度的影响很大。骨料的随机分布造成弹丸两侧侧向阻力不均,是影响挠度的主要因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental and 3D mesoscopic numerical simulation study of kinetic projectile penetrating into concrete
Concrete is a multiphase composite material composed of mortar, aggregate, and interface transition zone (ITZ). The mesoscopic components of concrete have an important influence on its anti-penetration performance. In this study, a series of penetration experiments with large-caliber ogive-nosed projectiles penetrating concrete targets are carried out. The test results show that the damage to the concrete target consists of crater and tunnel zones and increases with increasing impact velocity. Then, a local background grid method is proposed to establish a 3D mesoscopic model of concrete, based on the arrangement characteristics of the sequence number of the finite elements. Compared with the traditional 3D mesoscopic concrete modeling method, the proposed method can effectively improve the modeling efficiency. Subsequently, numerical simulations are performed based on the 3D mesoscopic model, with the simulation and experimental results in good agreement, verifying the effectiveness of the model. Finally, the verified 3D mesoscopic model is employed to investigate the effects of shape, volume fraction, size interval, and strength of the concrete aggregates on the depth of penetration (DOP) and deflection of the projectile. The simulation results indicate that the shape of the aggregate has a negligible effect on both uniaxial compressive strength and DOP. Therefore, spherical aggregates are used to improve modeling efficiency. Increasing the volume fraction and strength of the aggregates can significantly enhance the anti-penetration performance of concrete. The influence of aggregate size interval on DOP is slight, but it has a significant impact on projectile and trajectory deflection at the same aggregate volume fraction. The uneven lateral resistance on both sides of the projectile, caused by the random distribution of aggregates, is a major factor in deflection.
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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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