基于环境腐蚀损伤的某型飞机日历寿命的确定

目的基于腐蚀的观点,确定基于环境区域腐蚀损伤的某型飞机结构的日历寿命。方法通过试验确定各级温湿度下飞机结构常用铝合金材料2Al2-T3腐蚀至任意损伤值的时间曲线(T-H曲线),并根据某型飞机的服役环境谱以及对应的腐蚀损伤容限D_c确定该型飞机的日历寿命。结果试验确定出不同湿度下的T-H曲线,引入海南陵水机场的温湿度环境谱,将数据带入计算模型,所得结果比较合理。结论该模型可以合理地求得腐蚀环境下飞机结构的日历寿命,获得的2Al2-T3铝合金腐蚀损伤时间曲线具有普适性。

Determination of Calendar Life of a Certain Aircraft Structure Based on Environmental Corrosion Damage

Objective To determine calendar life of an aircraft structure with corrosion damage in environment region based on corrosion perspective. Methods The time curve (T-H curve) of 2A12-T3 corrosion to arbitrary damage value of aluminum 2A12-T3 alloy materials commonly used in aircraft structures under different temperature and humidity was determined by experiment, and the calendar life of a certain aircraft was determined according to its service environment spectrum and the corresponding corrosion damage tolerance Dc. Results The T-H curve under different humidity was determined by experiment. The environment spectrum of temperature and humidity in Lingshui Airport was obtained by statistics. The calculated result was reasonable. Conclusion The model can get the calendar life of aircraft structure in corrosive environment and the time curve (T-H curve) for aluminum alloy corrosion damage of 2A12-T3 is universal.