关键词: 腐蚀环境, 标记载荷法, 疲劳寿命, 裂纹扩展

Abstract: The coastal aircraft's parking-flight-parking processes were modeled by the alternating effects of the corrosion environment spectrum and the fatigue load spectrum, taking the lower wall panels of the aircraft beam structure connectors as the main research object. The propagation of the cracks was monitored by the marked load method and the detailed visual inspection method, and the fracture morphology was observed with a GE5 microscope. The influences of the corrosion environments on the fatigue life and crack propagation of the aircraft beam structure connectors were analyzed. The testing results show that the specimens are protected by the protective paints on the surfaces and the sealant at the joints during the initial formation stages of the penetrated cracks, the corrosion environments have no obvious effects on the fatigue life of the beam structure connectors during this stage. Compared with the non-corrosion tests, the life of this period is reduced by 5.5%. The corrosion environment accelerates the propagation processes of penetrated cracks during the propagation stages of penetration cracks. Meanwhile, the dispersion of the crack propagation processes was exacerbated. Compared with the non-corrosion tests, the propagation life of penetrated cracks is reduced by 23.1%.

Key words: corrosion environment, marked load method, fatigue life, crack propagation