A micro contact model for electrical contact resistance prediction between roughness surface and carbon fiber paper.pdfVIP

International Journal of Mechanical Sciences 124–125 (2017) 37–47 Contents lists available at ScienceDirect International Journal of Mechanical Sciences journal homepage: /locate/ijmecsci A micro contact model for electrical contact resistance prediction between roughness surface and carbon ?ber paper Diankai Qiua, Linfa Penga, Peiyun Yia, Xinmin Laia,b,? a State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, PR China b Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, PR China MARK ARTICLE INFO Keywords: Electrical contact resistance (ECR) Contact model Roughness surface Carbon ?ber paper Porous structure ABSTRACT Electrical contact resistance (ECR) at the interface is of signi?cant importance in many ?elds of science and engineering. Current methods for contact resistance estimation are based on the typical nearly incompressible rough surfaces, which is not suitable for porous material with large deformation in the compression process. The objective of this work is to build an analytical model for ECR between solid material and porous material, for example, which could be used to predict power loss between carbon ?ber paper and bipolar plate in the fuel cell. First, mathematical description of solid roughness surface is built by classic Greenwood and Williamson model. Considering the porous structure, carbon ?ber paper is modeled by multi-layer construction based on random line network model. E?ect of large compression of carbon paper on contact behavior is furtherly given necessary attention in this study. Contact pressure and resistance are calculated based on statistical methods with consideration of multi-deformation states. Then, experiments are carried out to validate the numerical model. The results show good agreements with the numerical model. Finally, in?uences of carbon paper compression and main parameters are systematically disc