L 字型擬似等方性 CFRP ?層 ? 超高サイクル疲労 ?傷進展評価 ? 超音波疲労試験 ? 応用

Translated title of the contribution: Application of Ultrasonic Fatigue Test for Evaluation of Very High Cycle Fatigue Damage Growth in L-Shaped Quasi-Isotropic CFRP Laminates

Sugano Moe*, Kosugi Kensuke, Miyakoshi Tsuyosi, Hosoi Atsushi, Tsuda Terumasa, Kawada Hiroyuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The fatigue characteristics of carbon fiber reinforced plastics (CFRPs) in the very high cycle fatigue (VHCF) regime have not been well understood. Moreover, it is necessary to research the fatigue behavior of L-shaped CFRP laminates in VHCF regime, which is often seen in structures. To investigate the fatigue behavior of L-shaped CFRP laminates in the VHCF regime, an ultrasonic fatigue test method was constructed in this study. An ultrasonic fatigue test was conducted in the range of 107 - 109 cycles. The working frequency was 20 kHz, and the geometry of the specimen was designed by the results of finite element analysis to resonate in the same frequency. Displacement, temperature, and fatigue damage of specimen were observed. As a result, it was confirmed that specimens resonated at 20 kHz during the test. The high temperature was measured, and delamination was observed at the curved section of specimens. The results showed ultrasonic fatigue tests can perform with L-shaped CFRP laminates. The observation suggests that stress concentration occurs at curved section during the test, and the interlayer stresses between 90°ply and 45°ply near the center of the 16 layers are dominant in fatigue damage initiation.

Translated title of the contributionApplication of Ultrasonic Fatigue Test for Evaluation of Very High Cycle Fatigue Damage Growth in L-Shaped Quasi-Isotropic CFRP Laminates
Original languageJapanese
Pages (from-to)841-846
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume71
Issue number10
DOIs
Publication statusPublished - 2022

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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