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The role of electrical anisotropy and effective conducting thickness in understanding and interpreting static resistance measurements in CFRP composite laminates
Journal of Composite Materials ( IF 2.9 ) Pub Date : 2019-08-20 , DOI: 10.1177/0021998319870860
Robert J Hart 1 , OI Zhupanska 2
Affiliation  

This study is focused on (i) the experimental characterization of the anisotropic electrical resistivity of carbon fiber reinforced polymer (CFRP) composites and (ii) the development and experimental validation of predictive finite element (FE) models of the electrical response in CFRP laminates based on the concept of the effective conducting thickness. Two experimental methods have been developed to characterize the anisotropic electrical resistivities in three principle directions for the CFRP composite laminates using a direct current source. One method utilizes a traditional 6-probe resistance scheme and the alternative point-type 4-probe method is based on a handheld probe device similar to the JIS K7194 standard for homogenous plastics. An extensive experimental study has been conducted to characterize the anisotropic electrical resistivities of 16-ply unidirectional and 16-ply symmetric cross-ply IM7/977-2 and 32-ply unidirectional IM7/977-3 composites using the developed methods. Exploiting the concept of the effective conducting thickness, which describes the effective depth of current penetration through the thickness of an electrically anisotropic material, a unique methodology is developed for constructing FE models of these highly anisotropic CFRP materials. The concept of effective conducting thickness was identified as a critical component in achieving accuracy of the FE results as well as recovery of experimental resistivity from the alternative point-type 4-probe method. The FE models have been validated using the experimental results on the CFRP specimens of varying layup and thickness, and the techniques developed in this work may lead to advancements in non-destructive techniques in the areas of electrical characterization and damage sensing.

中文翻译:

电各向异性和有效导电厚度在理解和解释 CFRP 复合材料层压板静态电阻测量中的作用

本研究的重点是 (i) 碳纤维增强聚合物 (CFRP) 复合材料的各向异性电阻率的实验表征和 (ii) CFRP 层压板电响应的预测性有限元 (FE) 模型的开发和实验验证关于有效导电厚度的概念。已经开发了两种实验方法来表征使用直流电源的 CFRP 复合材料层压板在三个主要方向上的各向异性电阻率。一种方法使用传统的 6 探针电阻方案,另一种点型 4 探针方法基于类似于 JIS K7194 均质塑料标准的手持式探针设备。已经进行了广泛的实验研究,以使用开发的方法表征 16 层单向和 16 层对称交叉层 IM7/977-2 和 32 层单向 IM7/977-3 复合材料的各向异性电阻率。利用有效导电厚度的概念,它描述了电流穿透电各向异性材料厚度的有效深度,开发了一种独特的方法来构建这些高度各向异性 CFRP 材料的有限元模型。有效导电厚度的概念被确定为实现 FE 结果准确性以及从替代点型 4 探针方法恢复实验电阻率的关键组成部分。
更新日期:2019-08-20
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