Study on verification of the anisomorphic CFL diagram approach to fatigue life prediction and identification of controlling factors

2010 Fiscal Year Self-evaluation Report

• Project/Area Number: 20360050
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: University of Tsukuba
• Principal Investigator: KAWAI Masamichi University of Tsukuba, 大学院・システム情報工学研究科, 教授 (90169673)
• Project Period (FY): 2008 – 2011
• Keywords: 複合材料 / 疲労 / 寿命予測法 / 等寿命線図 / 非相似形等寿命線図 / 影響因子

Research Abstract

本研究においては、研究代表者が提案した「非相似形等寿命線図法」の一般的な有効性を検証することを主目的とし、それを工学的な疲労設計手法へ発展させる上で考慮すべき事柄の抽出も併せて行う。
具体的には、次の4つの因子[(I)試験温度、(II)吸湿量、(III)積層板の厚さ方向の面外疲労荷重、(IV)切欠等の損傷発生源]が応力比の異なる定常疲労強度に及ぼす影響を詳細に調査する。これらの異なる疲労条件に対して取得した疲労データに基づいて等寿命線図を作成し、研究代表者の提案する非相似形等寿命線図法を用いた予測と比較することによって、予測精度と適用範囲を明らかにする。適用限界が認められる場合は、可能な一般化についても研究する。

Research Products

• [Journal Article] Modified Anisomorphic Constant Fatigue Life Diagram for Symmetric Angle-Ply Carbon/Epoxy Laminates at Room Temperature (2010)
  • Author(s): Kawai, M., Murata, T.
  • Journal Title: Composites Part A Vol.41 Pages: 1498-1510
  • Peer Reviewed
• [Journal Article] Anisomorphic Constant Life Diagram Approach Taking Account of the Temperature Dependence of Fatigue of CFRP Laminates (2010)
  • Author(s): Yoshimura, R., Kawai, M., Matsuda, Y.
  • Journal Title: Proc.of The Seventh Asian-Australasian Conference on Composite Materials (ACCM-7) CDROM.
  • Peer Reviewed
• [Journal Article] Effect of Water Uptake on the Fatigue Behavior of a Quasi-Isotropic Woven Fabric Carbon/Epoxy Laminate at Different Stress Ratios (2009)
  • Author(s): Yagihashi, Y., Kawai, M., Hoshi, H., Iwahori, Y.
  • Journal Title: Proc.of Asian Pacific Conference for Materials and Mechanics and Mechanics (APCMM2009) USB.
  • Peer Reviewed
• [Journal Article] Off-Axis Strength Differential Effects in Unidirectional Carbon/Epoxy Laminates at Different Strain Rates and Predictions of Associated Failure Envelopes (2009)
  • Author(s): Kawai, M., Saito, S.
  • Journal Title: Composites Part A. Vol.40 Pages: 1632-1649
  • Peer Reviewed
• [Journal Article] Off-axis notched strength of fiber metal laminates and a formula for predicting anisotropic size effect (2009)
  • Author(s): Kawai, M., Arai, Y.
  • Journal Title: Composites Part A Vol.40 Pages: 1900-1910
  • Peer Reviewed
• [Presentation] Principal Master Diagrams for Fatigue of a Unidirectional CFRP Laminate at Room Temperature (2010)
  • Author(s): Teranuma, T., Kawai, M.
  • Organizer: The Seventh Asian-Australasian Conference on Composite Materials (ACCM-7)
  • Place of Presentation: Taipei, Taiwan.
  • Year and Date: 20101115-20101118
• [Presentation] Constant fatigue life diagrams for a woven CFRP laminate at room and high temperatures (2010)
  • Author(s): Kawai, M., Matsuda, Y., Yoshimura, R., Hoshi, H., Iwahori, Y.
  • Organizer: The Fifth International Conference on Fatigue of Composites (ICFC-5)
  • Place of Presentation: Nanjing, China.
  • Year and Date: 20101016-20101019
• [Presentation] Effect of Water Uptake on the Fatigue Behavior of a Quasi-Isotropic Woven Fabric Carbon/Epoxy Laminate at Different Stress Ratios (2010)
  • Author(s): Kawai, M., Yagihashi, Y., Hoshi, H., Iwahori, Y.
  • Organizer: The Fifth International Conference on Fatigue of Composites (ICFC-5)
  • Place of Presentation: Nanjing, China.
  • Year and Date: 20101016-20101019
• [Presentation] Anisomorphic Constant Fatigue Life Diagram for a Woven CFRP Laminate at Room and High Temperatures (2009)
  • Author(s): Kawai, M., Matsuda, Y., Hoshi, H., Iwahori, Y.
  • Organizer: International Conference on Composite Materials (ICCM-17)
  • Place of Presentation: Edinburgh, UK.
  • Year and Date: 20090727-20090731
• [Presentation] Multiaxial Modeling of Notch Sensitivity of Orthotropic Composites in the Ductile-to-Brittle Transition Region (2009)
  • Author(s): Kawai, M.
  • Organizer: The 2nd ECCOMAS Thematic Conference on the Mechanical Response of Composites (Composites2009)
  • Place of Presentation: London, UK.
  • Year and Date: 20090501-20090503
• [Book] Fatigue life predicrion of composite materials under constant amplitude loading(編者Vassilopoulos, A.P.第6章執筆、単著) (2010)
  • Author(s): Kawai, M.
  • Total Pages: 177-219
  • Publisher: Woodhead Publishing Limited