Affiliation:
1. Center for Composite Materials and Structures, Harbin Institute of Technology (HIT) Science Park, Harbin, P.R. China
2. Department of Aerospace Science and Mechanics, Harbin Institute of Technology (HIT), Harbin, P.R. China
Abstract
Advanced polymer matrix composite is a brittle material, and local fibre, matrix fracture and bonding delamination will cause the catastrophic failure of the composite. So, the strain and damage structural health monitoring of the composite material and its structures is very important for its applications. Based on the piezo-resistivity effect, micro-pore structure and resin infiltration properties of buckypaper, in this study, we develop a self-sensing composite based on embedded buckypaper, which only acts as a sensing layer to monitor the strain and damage of the composite. The strain and damage of the composite are reflected by the resistance change in the embedded buckypaper. The strain sensing properties of the buckypaper/epoxy film with different buckypaper aspect ratios 3:1, 6:1, 9:1, 12:1 and 15:1 were studied with voltammetry method, and the results indicated that there were two-stage relation between resistance change and strain, and under low strain level (~2000 µε), the strain sensitivity was nonlinear and unstable, but in the high strain level, the strain sensitivity was high with strain factor about 6.2, which was independent of the dimension of buckypaper layer. The self-sensing composite made of glass fibre–reinforced composite with embedded buckypaper shows the same strain sensing properties as buckypaper/epoxy film; at same time the damage revolution of the composite could be monitored by resistance development. The scanning electron microscope characterization demonstrated that the resin can penetrate into buckypaper of the composite and form strong bonding interface. The self-sensing composite can be applied in further large-scale advanced polymer composite materials and structures structural health monitoring (strain monitoring and damage detecting).
Subject
Mechanical Engineering,Biophysics
Cited by
34 articles.
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