Fatigue modeling for carbon/epoxy unidirectional composites under various stress ratios considering size effects

Journal Article · Fri Nov 09 00:00:00 EST 2018 · International Journal of Fatigue

DOI:https://doi.org/10.1016/j.ijfatigue.2018.11.009· OSTI ID:1504743

Liu, Haolong ^[1]; Ojha, Avinesh ^[2]; Li, Ziang ^[2]; Engler-Pinto, Carlos C. ^[2]; Su, Xuming ^[2]; Sun, Qingping  ^[1]; Kang, Hongtae ^[3]; Wen, Weidong ^[1]; Cui, Haitao ^[1]

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1. Nanjing University of Aeronautics and Astronautics (China)
2. Ford Motor Company, Dearborn, MI (United States)
3. Univ. of Michigan, Dearborn, MI (United States)

In this work, fatigue tests for unidirectional (UD) CFRP composite specimens of various sizes are conducted under different stress ratios. The results show that the specimen size has considerable influence on the transverse tension-tension fatigue performance of UD laminates. The underlying fatigue mechanisms are also investigated through SEM observations. Moreover, a fatigue life prediction method considering size effects is presented, and a good correlation is observed between the prediction and the test data. Lastly, to allow for an evaluation of the effects of mean stress, constant fatigue life diagrams for 0°, 10°, and 90° UD composites are established based on four-segment anisomorphic model.

• Research Organization: Ford Motor Company, Detroit, MI (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• Grant/Contract Number: EE0006867
• OSTI ID: 1504743
• Alternate ID(s): OSTI ID: 1636174
• Journal Information: International Journal of Fatigue, Vol. 120, Issue C; ISSN 0142-1123
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
CFRP composites
Fatigue model
Size effect
Constant fatigue life diagram