Recent Development of Research on Very High Cycle Fatigue of Fiber Reinforced Plastic
WU Tao1, YAO Weixing1,2, HUANG Jie1
1 Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016,China 2 State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Abstract: Since the early development, fiber reinforced plastic (FRP) materials have been widely used in aerospace and other modern engineering fields due to their advantages of high strength, low density, anti-fatigue property and excellent designability. With the in-depth study of FRP failure mechanism and the improvement of design level, the design admissibility of FRP materials in engineering has been gradually enhanced, and the fatigue problem of FRP materials can not be ignored anymore. In particular, the FRP materials in high-speed railway and aircraft structures often bear high-frequency vibration load due to aerodynamic force, which leads to very high cycle fatigue (VHCF) failure of FRP materials. The research on very high cycle fatigue of FRP mainly focuses on the four aspects, VHCF test methods, VHCF damage mechanism, the cha-racteristics of VHCF performance curve and VHCF life prediction methods. Among them, the fatigue test methods provide basic test data, which is the most fundamental part of the research work. The VHCF tests of FRP mainly adopt the VHCF test methods of metallic materials. However, due to the large damping, poor thermal conductivity and high temperature sensitivity of FRP materials, it is difficult to directly increase the load frequency in FRP VHCF tests. At present, it is mainly by reducing the thickness of the specimen, applying intermittent load and cooling that the control of specimen temperature is carried out, with the load frequency increased and the test time of VHCF shortened. The essential difference between VHCF and conventional fatigue lies in the difference of fatigue damage mechanism. Under very high cycle fatigue load, the matrix crack damage of FRP materials may be transformed into local pitting corrosion, and the delamination damage may initiate before the matrix crack, which is different from the typical three-stage damage evolution process. Under the very high cycle fatigue load, the S-N curve of FRP materials also shows three different forms, respectively corresponding to the existence of fatigue limit, continuous decrease of fatigue strength and step-like decrease of fatigue strength. The VHCF life prediction methods of FRP mainly follow the conventional non-VHCF fatigue life prediction methods, in which the matrix crack density methods have a reduced dependence on the very high cycle fatigue experiment data. At present, the research on damage evolution and performance curve of FRP materials under VHCF is limited to the observation-dominant methods , which lacks systematic research and summary. In this paper, the recent research of very high cycle fatigue of FRP is reviewed, and the above-mentioned four aspects have been introduced in detail. Based on the comparative analysis of existing research results, the problems of very high cycle fatigue of FRP that need to be further stu-died have been put forward.
吴涛, 姚卫星, 黄杰. 纤维增强树脂基复合材料超高周疲劳研究进展[J]. 材料导报, 2022, 36(6): 20050117-9.
WU Tao, YAO Weixing, HUANG Jie. Recent Development of Research on Very High Cycle Fatigue of Fiber Reinforced Plastic. Materials Reports, 2022, 36(6): 20050117-9.
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