关键词: 尾梁, 裂纹, 夹层结构, 玻璃布, 复合材料

Abstract: Tailboom is the principal structure of the helicopter, and the helicopter rear structure global/local finite element mode is built. Based on the finite element analysis result, it is confirmed that there is a high stress level in the tailboom inner skin antenna opening hole area, the crack is produced and propagated under fatigue load. The crack is repaired by using two methods of thin aluminum sheet and glass fabric. From the result of finite element analysis results of different repair schemes, the stress leve decreased 72% and 81% respectively compared with the original structure. Combined with the repair process and parameters, the glass fiber fabric is chosen to repair the crack, it is confirmed by several helicopters over half a year and 500 flight hours, the tailboom inner skin has no more failure. The reliability of repairing tailboom skin crack was verified.

Key words: tailboom, crack, sandwich structure, glass fiber, composites