泡沫铝-聚氨酯-环氧树脂正交各向异性互穿相复合材料(APEC)压缩性能试验研究

EXPERIMENTAL STUDY ON COMPRESSIVE PROPERTIES OF ORTHOTROPIC ALUMINUM FOAM-POLYURETHANE-EPOXY INTERPENETRATING PHASE COMPOSITE (APEC)

  • 摘要: 泡沫铝互穿相复合材料(Interpenetrating Phase Composites, IPCs)逐渐成为复合材料领域的研究热点并得到广泛的应用。然而,传统泡沫铝IPCs难以兼顾强度与塑性。为突破此局限,本研究提出一种新型泡沫铝-聚氨酯-环氧树脂互穿相复合材料(Aluminum Foam-Polyurethane-Epoxy Interpenetrating Phase Composites, APEC),由聚氨酯(PU)和环氧树脂(EP)分层交替填充至开孔泡沫铝(AF)骨架中形成。为了研究APEC的压缩性能,开展了APEC及传统泡沫铝IPCs(AF-PU、AF-EP)的准静态单调压缩试验,系统对比分析了应力-应变曲线、吸能量曲线、比吸能及理想吸能效率曲线。结果表明:相较于传统泡沫铝IPCs,APEC综合利用PU的超弹性和EP的高强度,实现了泡沫铝IPCs的强度-塑性-吸能性能协同提升。其屈服强度和平台应力分别达到33.3 MPa和42.6 MPa,较AF-PU提升约175%;同时,APEC的密实化应变高达0.645,相比AF-EP提升约67%。在能量吸收方面,APEC的密实化点吸能量和比吸能分别可达24.2 MJ/m3和14.7 J/g(较AF-PU提升约194%),并能在0.15-0.6的宽应变区间内维持约0.85的高理想吸能效率。此外,APEC展现出显著的正交各向异性特征,在水平/竖直正交双轴方向分别展现出不同的强度、塑性和吸能特性,在碰撞吸能、防护结构及桥梁防撞构件等领域具有良好的工程应用潜力。本研究可为互穿相复合材料的相关研究和应用提供参考。

     

    Abstract: Aluminum Foam Interpenetrating Phase Composites (IPCs) are now a research focus with broad applications. However, conventional aluminum foam IPCs face a strength-ductility trade-off. To overcome this limitation, this study develops a novel Aluminum Foam-Polyurethane-Epoxy Interpenetrating Phase Composites (APEC) with layered Polyurethane (PU)and Epoxy resin (EP) filling in an open-cell Aluminum Foam (AF) skeleton. Quasi-static monotonic compression tests are performed on APEC and traditional aluminum foam IPCs (AF-PU and AF-EP), and their stress-strain behavior and energy absorption properties are systematically compared. Test results show that APEC combines the hyperelasticity of PU with the high strength of EP, achieving a simultaneous improvement in strength, in ductility and, in energy absorption. The yield strength and plateau stress reach 33.3 MPa and 42.6 MPa, about 175% higher than those of AF-PU. The densification strain of APEC reaches0.645, approximately 67% higher than that of AF-EP. The energy absorption up to the densification and to the specific energy absorption of APEC reach 24.2 MJ/m3 and 14.7 J/g, about 194% higher than those of AF-PU, and it maintains a high ideal energy absorption efficiency of about 0.85 over a wide strain range of 0.15-0.6. Furthermore, APEC exhibits strong orthotropy, with direction-dependent mechanical and energy-absorption properties, making it suitable for impact protection, for structural safety, and for bridge anti-collision applications. This study provides a useful reference for future researches and applications of interpenetrating phase composites.

     

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