关键词: 挖补修理, 湿铺层, 热补仪, 压缩性能, 压-压疲劳, 复合材料

Abstract: Scarf repair is a widely used permanent repair method for composite structures. In this paper, the static compression and compression-compression fatigue properties of scarf repaired composite laminates were studied experimentally. The specimens were repaired by wet layup scarf repair and prepreg scarf repair method, and cured by hot bonder. The scarf ratio was 1∶30, and there were three damage sizes. The peak and valley values of fatigue test were 70% and 7% of the limit load, with a total of one million times. In the process of fatigue test, nondestructive C-scan was used to detect the damage and its extension of the specimens. The strain data, failure load and failure mode of static test and post-fatigue static test were recorded. The results show that there is no damage and its extension happened during the process of fatigue test for the both two repair methods, and the stiffness of the specimens do not decrease after fatigue. The repair method, whether be fatigued or not and the damage size have no influence on the buckling load and the failure load of the specimens. The failure load of the end crush specimen is higher than that of the middle fracture specimen. The failure load of the two repair methods can reach more than 200% of the limit load, indicating that the repair result is ideal.

Key words: scarf repair, wet layup repair, hot bonder, compression property, compression-compression fatigue, composites