Mesoscopic simulation study on density gradient metallic foam sandwich panels under hypervelocity impact

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2024-11-29 DOI:10.1016/j.tws.2024.112762

Qunyi Tang , Qiguang He , Xiaowei Chen

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引用次数: 0

Abstract

The high stiffness of sandwich panel shield ensures the survival of satellites and spacecrafts, making them extensively utilized in practical aerospace engineering. Metallic foams are exceptionally appropriate for spacecraft debris shields owing to their light weight and superior energy absorption characteristics. The internal mesostructure of a metallic foam plays a crucial role in determining its protective performance. At the mesoscale, the density gradient metallic foam exhibits a greater potential for protection compared to uniform metallic foam under hypervelocity impact. Therefore, this study investigates the behavior of density-gradient foams under hypervelocity impact. By leveraging three-dimensional Voronoi tessellation in conjunction with the background mesh-mapping algorithm, this study constructed mesoscopic finite element models of the layered and continuous-density gradient metallic foam, considering the internal structure of randomness. Subsequently, the Finite Element-Smoothed Particle Hydrodynamics (FE-SPH) adaptive method in LS-DYNA was employed to conduct numerical simulations of the hypervelocity impact. First, the simulation was validated through a comparison with the experiment. Based on the results of the numerical simulations, the characteristics of the debris cloud and the damage within the foam were analyzed. It was determined that the protection mechanism of the density gradient foam sandwich panel under hypervelocity impact involved a coupling effect between the domino and microchannel effects. The different damage characteristics of layered density gradient foam sandwich panels were analyzed. According to this mechanism, foam sandwich panels with different density-gradient configurations were designed and their protective performances were compared to determine the optimal density-gradient configuration to provide valuable insights into the optimal design of protective structures.

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超高速冲击下密度梯度金属泡沫夹层板的细观模拟研究

夹层板屏蔽板的高刚度是卫星和航天器的生存保障，在实际航天工程中得到广泛应用。金属泡沫由于其重量轻和优越的能量吸收特性，特别适合用于航天器碎片防护。金属泡沫材料的内部细观结构对其防护性能起着至关重要的作用。在中尺度，与均匀金属泡沫相比，密度梯度金属泡沫在超高速冲击下表现出更大的保护潜力。因此，本文研究了密度梯度泡沫在超高速撞击下的行为。本研究利用三维Voronoi镶嵌结合背景网格映射算法，在考虑内部结构随机性的情况下，构建了层状连续密度梯度金属泡沫的细观有限元模型。随后，利用LS-DYNA中的有限元-光滑粒子流体力学（FE-SPH）自适应方法对超高速碰撞进行数值模拟。首先，通过与实验的对比，验证了仿真的正确性。在数值模拟的基础上，分析了碎片云的特征和泡沫内部的损伤。确定了密度梯度泡沫夹层板在超高速冲击下的保护机制是多米诺骨牌效应和微通道效应的耦合作用。分析了层状密度梯度泡沫夹层板的不同损伤特征。根据这一机理，设计了不同密度梯度配置的泡沫夹芯板，并对其防护性能进行了比较，确定了最优密度梯度配置，为防护结构的优化设计提供了有价值的见解。

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

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.