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4. Stress and energy release rate analysis of cross-ply carbon fiber-reinforced plastic laminate with transverse cracks subjected to ultrasonic vibration using a variational approach.

Author

Nishi, Yuki, Itoh, Shinji, Hosoi, Atsushi, and Kawada, Hiroyuki

Subjects
CARBON fiber-reinforced plastics, STRAINS & stresses (Mechanics), ULTRASONIC testing, STRESS concentration, LAMINATED plastics, HIGH cycle fatigue
Abstract

Application of carbon fiber reinforced plastics (CFRP) to structures that are subjected to increasingly high numbers of cyclic loads is expected to expand, so evaluation of fatigue properties up to the very-high cycle regime is essential to prove their long-term reliability. Conventional fatigue testing is not practical for such conditions owing to the excessive time required; ultrasonic fatigue testing, which can be performed at a frequency of 20 kHz, is an effective alternative. Stress distribution in ultrasonic fatigue testing differs from that in conventional fatigue testing because the specimen is resonated. The stress distribution of cross-ply laminates with transverse cracks subjected to resonance was calculated using a variational approach. The energy release rate was calculated based on the results of a previous study on transverse crack initiation. The results of the stress analysis are in good agreement with those of finite-element analysis. Quantitative evaluation of transverse crack initiation was also conducted. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Effect of interfacial nanostructure on mode mixity in directly bonded carbon fiber reinforced thermoplastic laminates and aluminum alloy considering thermal residual stress

Author

OTA, Hiroki, JESPERSEN, Kristine Munk, SAITO, Kei, WADA, Keita, HOSOI, Atsushi, KAWADA, Hiroyuki, OTA, Hiroki, JESPERSEN, Kristine Munk, SAITO, Kei, WADA, Keita, HOSOI, Atsushi, and KAWADA, Hiroyuki

Abstract

In recent years, for the aim of weight reduction of transportation equipment, carbon fiber reinforced thermoplastics (CFRTPs), which have high recyclability and formability, are becoming suitable for mass production.Additionally, with the development of multi-material structures, excellent technologies are required for joining metals and CFRTPs. Presently, adhesive bonding and mechanical joining methods are employed for joining dissimilar materials,however, these methods still have some problems. Therefore, an alternative bonding method that does not use adhesives or employ mechanical joining is required for joining CFRTPs and metals. This study focuses on direct bonding between the CFRTP laminate and an aluminum alloy by fabricating a nanostructure on the aluminum alloy surface. The nanostructure penetrates the CFRTP matrix, causing an anchoring effect that improves the bonding strength significantly. The influence of the nanostructure on the energy release rateof the directly bonded CFRTP and aluminum was evaluated bystatic double cantilever beam testing. Because of the difference in thermal expansion coefficients of the CFRTP laminate and the aluminum alloy, significant residual stresses are generated. The effect of the thermal residual stresses on the energy release ratealong with the resulting mode mixity (mode I and II) was determined. Results reveal that the critical energy release rate is improved by the nanostructure and mode I contribution of the energy release rate is increased for the nanostructure case.

Published
2021

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