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175 results on '"Sanada, Kazuaki"'

8. Evaluation of the viscoelastic behavior, thermal transitions, and self‐healing efficiency of microcapsules‐based composites with and without a catalyst using dynamic mechanical analysis technique.

Author

Ahmed, Abdalla, Ali, Alamry, Alzahrani, Bandar, and Sanada, Kazuaki

Subjects
SELF-healing materials, DYNAMIC mechanical analysis, BEHAVIORAL assessment, GLASS transition temperature, CATALYSTS, MECHANICAL efficiency
Abstract

This comprehensive study investigates the viscoelastic behavior, thermal transitions, and self‐healing efficiency of microcapsule‐based composites with and without a catalyst. The composites consist of urea‐formaldehyde/dicyclopentadiene microcapsules embedded in an epoxy matrix, with the addition of Grubbs' catalyst. Our research examines the impact of repetitive dynamic mechanical analysis (DMA) testing and the presence of Grubbs' catalyst on the composites' self‐healing efficiency and dynamic mechanical properties. Using laser microscopy, optical microscopy, Fourier‐transform infrared spectroscopy, and thermogravimetric analysis, we employ various characterization techniques to enhance our understanding of the composite behavior. The findings emphasize the importance of evaluating self‐healing efficiency through DMA, which is a reliable, expeditious, and non‐destructive method. The results show that incorporating Grubbs' catalyst significantly enhances the self‐healing performance of the composites, effectively mitigating the degradation of mechanical properties due to aging. Furthermore, the inclusion of catalyst particles improves stiffness, rigidity, and energy dissipation characteristics, facilitating the self‐healing process. However, careful consideration is necessary to balance mechanical properties and the glass transition temperature when designing self‐healing composites. This study demonstrates a promising self‐healing efficiency of approximately 73% and 44% in the second and third DMA tests, respectively, for composites containing microcapsules and Grubbs' catalyst. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Microstructure optimizations for improving interlaminar shear strength and self-healing efficiency of spread carbon fiber/epoxy laminates containing microcapsules.

Author

Nassho, Yasuka and Sanada, Kazuaki

Subjects
*SHEAR strength, *SELF-healing materials, *CARBON fibers, *LAMINATED materials, *MICROSTRUCTURE, *EPOXY resins
Abstract

The purpose of this study is to improve interlaminar shear strength and self-healing efficiency of spread carbon fiber (SCF)/epoxy (EP) laminates containing microcapsules. Microencapsulated healing agents were embedded within the laminates to impart a self-healing functionality. Self-healing was demonstrated on short beam shear specimens, and the healing efficiency was evaluated by strain energies of virgin and healed specimens. The effects of microcapsule concentration and diameter on apparent interlaminar shear strength and healing efficiency were discussed. Moreover, damaged areas after short beam shear tests were examined by an optical microscope to investigate the relation between the microstructure and the healing efficiency of the laminates. The results showed that the stiffness and the apparent interlaminar shear strength of the laminates increased as the microcapsule concentration and diameter decreased. However, the healing efficiency decreased with decreasing the microcapsule concentration and diameter. [ABSTRACT FROM AUTHOR]

Published
2021
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