探索混合聚氨酯(PU)泡沫填充晶格超材料的增强型能量吸收性能

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-07-26 DOI:10.1016/j.ijimpeng.2024.105058
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引用次数: 0

摘要

本研究通过实验和数值研究探讨了混合聚氨酯(PU)泡沫填充晶格超材料在受到低速冲击(LVI)时的增强能量吸收性能。首先,利用增材制造技术制备了三种类型的晶格,然后利用冷冻铸造技术填充聚氨酯泡沫。通过实验和数值低速冲击试验,对纯晶格结构和混合晶格结构的能量吸收性能进行了表征。这些实验和数值结果表明,与纯结构相比,混合结构具有更长的弹塑性和损伤演化阶段。混合结构的整体吸收能量明显高于纯晶格和聚氨酯泡沫的总和,这表明聚氨酯泡沫填充增强了能量吸收能力。此外,由于压缩扭转效应,纯双曲晶格结构和混合双曲晶格结构比其他两种结构具有更好的能量吸收能力。当泡沫发生坍塌时,混合结构中的晶格损伤会受到明显抑制。这表明,填充泡沫通过使泡沫塌陷来消散冲击能量,从而保护了嵌入的晶格。同时,泡沫填充防止了双曲晶格的过度扭曲行为,使应力分布更加均匀。
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Exploring the enhanced energy-absorption performance of hybrid polyurethane(PU)-foam-filled lattice metamaterials

In this study, the experimental and numerical investigations are performed to explore the enhanced energy-absorption performance of hybrid polyurethane(PU)-foam-filled lattice metamaterials subjected to low-velocity impact (LVI). Initially, three types of lattices are prepared by additive manufacturing technique, and then filled with the PU foams using freeze casting technique. Experimental and numerical LVI tests have been performed to characterize the energy-absorption performance of pure and hybrid lattice structures. These experimental and numerical results indicate that the hybrid structures possess the longer elastoplastic and damage evolution stages than the pure ones. The overall absorbed energy of the hybrid structures is distinctly higher than the sum of pure lattices and PU foams, disclosing the enhancement of the energy-absorption capacity induced by the PU-foam-filling. Besides, the pure and hybrid hyperbolic lattice structures exhibit the better energy-absorption capacity than two other types, due to the compression-twist effect. As the foam collapse occurs, the lattice damages are significantly inhibited in the hybrid ones. It reveals that the filled foams protect the embedded lattices via causing foam collapse to dissipate impact energy. Meanwhile, foam-filling prevents the excessive twisting behavior of the hyperbolic lattice and makes the stress distribute more evenly.

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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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