高速列车用碳纤维复合材料结构损伤修复门槛值研究

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Abstract In this paper,the damage repair of carbon fiber composites for new generation of high speed trains was studied. Firstly, the quasi-static indentation test was carried out to simulate different types and degrees of impact damage and to measure the dent size.Secondly the internal da-mage size was analyzed by ultrasonic C scanning. The measurement and nondestructive testing results were used as dimension parameters to characterize the damage degree. The compressive residual strength testing of the damaged material after static indentation test was carried out. At the same time the simulation analysis method was used to expand the test conditions and compared with the test data to establish the relationship between the damage size and residual strength. The damage repair threshold value was determined. Experimental results showed that the residual strength can establish a decreasing relationship with the dent depth, the dent maximum diameter and the maximum diameter of ultrasoniced C scanning under quasi-static compression condition of one size compression head.The results show that when the maximum damage diameter of ultrasonic C is between 28 mm and 34 mm and the residual strength is between 75% and 84%. Finally the maximum damage diameter for 30 mm nondestructive testing is chosen as the threshold value of repair.

Key words： carbon fiber composites threshold value of repair damage quasi-static indentation test compressive resudial strength

Published: 16 July 2021

CLC number:

TB33

Fund:Strategic International Scientific and Technological Innovation Cooperation (2018YFE0201300).

About author:: Sansan Ding (Ph.D., graduated from Beijing Jiaotong University, China) was the assistant chief engineer of CRRC Qingdao Sifang Co., Ltd., and committed to the research and development of rail transit vehicles for many years. Excellent achievements have been made by Ding and his work team in terms of domestic indepen-dent high-speed train brand building. Major projects in his charge were schematic and technical designs of the following EMU train products: CRH380A next generation high-speed EMU, 250/350km setting EMU, high cold-resistant EMU, and CRH6 series intercity EMU. Furthermore, he took charge of the deve-lopments of CFRP (Carbon Fiber Reinforced Plastics) bodywork and bogie frame in the project of “Next Generation CETROVO”. As the principal of two national technology platforms (National High-speed EMU Assembly Enginee-ring Technology Research Center & National Engineering Laboratory for High-speed Train System Integration), he is now presiding over a national “13th Five-Year” key science and technology project — Key technology of high-speed maglev transportation (600 km/h) system.Kejian Liu, graduated from Nanjing University of Science and Technology in July 2009, with a master degree of material processing engineering major. He was engaged in the research and development of resin-based composite for the past few years. He was specialized in the structural design and molding process of blades and nacelle covers, and once presided over the developments of various types of megawatt wind turbine blades and nacelle covers. Later, he joined ACC (Beijing) Science and Technology Co., Ltd., and was in charge of the research and development of a certain prepreg as well as the design and development of CFRP products. He joined CRRC Qingdao Sifang Co., Ltd. in March 2019, and was engaged in the lightweight design and development of rail transit vehicle pro-ducts, including the research and development of composite components for subway, high-speed railway, maglev and other vehicles.

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Cite this article:

DING Sansan,LIU Kejian. Research on Threshold Value of Repair for Carbon Fiber Composite Used for High-speed Rail[J]. Materials Reports, 2021, 35(Z1): 613-616.

URL:

http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/IZ1/613