Evaluation of the interfacial strength of carbon-fiber-reinforced temperature-resistant polymer composites by the micro-droplet test |
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| Authors: | Mio Sato Erina Imai Jun Koyanagi Yuichi Ishida Toshio Ogasawara |
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| Affiliation: | 1. Department of Materials Science and Technology, Graduate School of Tokyo University of Science, Tokyo, Japan;2. Department of Materials Science and Technology, Tokyo University of Science, Tokyo, Japan;3. Japan Aerospace Exploration Agency, Tokyo, Japan;4. Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan |
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| Abstract: | This paper presents an evaluation method for the fiber/matrix interfacial strength. The interfacial strength is determined by comparing experimental data with numerical simulations. The micro-droplet test is conducted, and the fiber axial stress at the point of interface debonding is obtained. A numerical simulation is performed with ABAQUS using an axisymmetric finite-element model. In the numerical simulation, an accurate value of the thermal residual stress based on the thermo-viscoelasticity and the damage to the resin around the blade-contacting point is considered to simulate the experimental phenomena ideally. In the thermal residual stress analysis, the actual thermal residual stress is calculated by considering the relaxation modulus and the time–temperature superposition principle for the resin. Damage initiation criteria for both dilatational and shear cases, based on continuum damage mechanics, are considered for the resin. Interfacial debonding is simulated using a cohesive zone model, and the interfacial strength is taken as the strength of the cohesive zone element at the simulated fiber maximum stress corresponding to the experimental value. |
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| Keywords: | interfacial strength continuum damage mechanics micro-droplet test FEM cohesive zone model |
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