Experimental study on the electrical conductivity and strain sensitivity of fibre-reinforced thermoplastic for structural health monitoring

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2024-11-19 DOI:10.1016/j.compstruct.2024.118729

Ciampaglia, S. Roccia, R. Ciardiello

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引用次数: 0

Abstract

This experimental study explores the mechanical, electrical, and piezometric characteristics of conductive thermoplastic polymers reinforced with short carbon and glass fibres. The work investigates how the local anisotropy induced during the manufacturing injection process impacts the properties of the composite. Tensile tests showed that the material orientation respect to the injection flow direction significantly affects the mechanical properties due to the alignment of the fibres with the injection flow, as shown with the microscopy analysis. Contrarily, electrically conductive tests showed that the influence of the orientation on the conductive properties of the material is negligible. The study also unveils the difference in the surface and bulk conductivity with the increasing distance of the electrodes. Tensile tests with in-situ electrical measurements were conducted to assess strain sensitivity by correlating stress–strain curves with changes in material conductivity. The results demonstrate the predominant impact of local anisotropy on piezometric response. Finally, a model for the piezometric response of the material is proposed and applied for the structural health monitoring of a tensile specimen, revealing its ability to detect local damage before final failure. This application underscores the prognostic capabilities of this material and its potential significance in ensuring structural integrity.

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用于结构健康监测的纤维增强热塑性塑料的导电性和应变敏感性实验研究

本实验研究探讨了用短碳纤维和玻璃纤维增强的导电热塑性聚合物的机械、电气和压强特性。这项工作研究了在制造注射过程中引起的局部各向异性如何影响复合材料的特性。拉伸测试表明，由于纤维与注塑流向一致，材料相对于注塑流向的取向会显著影响机械性能，显微镜分析也表明了这一点。相反，导电测试表明，取向对材料导电性能的影响可以忽略不计。这项研究还揭示了随着电极距离的增加，表面和主体导电性的差异。通过应力-应变曲线与材料电导率变化的相关性，进行了拉伸试验和原位电学测量，以评估应变敏感性。结果表明，局部各向异性对压电响应具有主要影响。最后，提出了一个材料压电响应模型，并将其应用于拉伸试样的结构健康监测，揭示了其在最终失效前检测局部损伤的能力。这一应用强调了这种材料的预报能力及其在确保结构完整性方面的潜在意义。

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来源期刊

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.