Dynamic mechanical behavior of CNT-reinforced epoxy under medium-strain rate: A comparative study

IF 6.3 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composite Structures Pub Date : 2024-07-04 DOI:10.1016/j.compstruct.2024.118343
Reza Yazdanparast , Roham Rafiee , Hamed Kalhori , Bing Li
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Abstract

Carbon nanotubes (CNTs) are generally recognized as one of the most effective fillers to improve the properties of polymeric materials. Subjected to dynamic loading, polymer-based materials often exhibit high strain rate sensitivity. This research investigates the effectiveness of CNTs fillers on the mechanical properties of an epoxy resin at low to medium strain rates through conducting a comparative experimental study. Performing tensile and shear tests, the elastic modulus and strength properties of CNT/epoxy and pure epoxy resin are measured at different strain rates. By proposing an empirical logarithmic relationship, the prediction of dynamic elastic modulus and strength properties at any desired low to medium strain rate is facilitated. For measuring the dynamic fracture toughness of CNT/epoxy and pure epoxy resin at medium strain rate, the instrumented charpy impact test based on the Dynamic Key Curves (DKC) method is used. Experimental measurements still imply on significant enhancements in axial and shear properties and also dynamic fracture toughness up to medium strain rates of 150 s−1 by adding small portion of CNTs.

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中应变速率下 CNT 增强环氧树脂的动态力学行为:比较研究
碳纳米管(CNT)被公认为是改善聚合物材料性能的最有效填充物之一。在动态加载条件下,聚合物基材料通常表现出较高的应变速率敏感性。本研究通过对比实验研究了 CNTs 填料在中低应变速率下对环氧树脂机械性能的影响。通过拉伸和剪切试验,测量了 CNT/环氧树脂和纯环氧树脂在不同应变速率下的弹性模量和强度特性。通过提出经验对数关系,有助于预测任何所需的中低应变速率下的动态弹性模量和强度特性。为了测量 CNT/环氧树脂和纯环氧树脂在中等应变速率下的动态断裂韧性,使用了基于动态关键曲线 (DKC) 方法的仪表式夏比冲击试验。实验测量结果表明,通过添加少量 CNT,轴向和剪切性能以及动态断裂韧性在 150 秒的中等应变速率下仍有显著提高。
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来源期刊
Composite Structures
Composite Structures 工程技术-材料科学:复合
CiteScore
12.00
自引率
12.70%
发文量
1246
审稿时长
78 days
期刊介绍: The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.
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