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.
丁叁叁, 刘克健. 高速列车用碳纤维复合材料结构损伤修复门槛值研究[J]. 材料导报, 2021, 35(Z1): 613-616.
DING Sansan, LIU Kejian. Research on Threshold Value of Repair for Carbon Fiber Composite Used for High-speed Rail. Materials Reports, 2021, 35(Z1): 613-616.