民机蒙皮材料紫外老化加速环境谱研究

研究紫外辐射环境对蒙皮材料的性能退化影响，进而对民机的紫外辐射防护设计提供重要依据，并依据其使用环境编制加速环境谱。通过分析民机的任务特点和使用环境，基于民机巡航高度下紫外辐射强度的仿真结果和相关紫外环境试验标准，提出了适用于民机蒙皮材料的紫外老化加速环境谱，给出了各试验条件的确定方法，以及加速环境谱与外场实际使用环境的当量加速关系。以民机机身部位蒙皮试样为例，初步开展了若干周期的紫外老化试验，蒙皮表面材料的形貌改变和性能退化验证了所提出的加速环境谱的可行性。

Accelerated Environmental Spectrum of Ultraviolet Aging for Civil Aircraft Envelop Material

The work aims to study the effect of ultraviolet radiation environment on the performance degradation of envelop material to provide an important basis for the ultraviolet radiation protection design of civil aircraft and compile the accelerated environmental spectrum according to its use environment. By analyzing the task characteristics and use environment of civil aircraft, the accelerated environmental spectrum of ultraviolet aging for civil aircraft envelop material was proposed based on the simulation results of ultraviolet radiation intensity at cruising altitude of civil aircraft and relevant ultraviolet environmental test standards. Then, the determination method of each environmental parameter and the equivalent acceleration relationship between the accelerated environmental spectrum and the actual application environment in the external field were given. Several cycles of ultraviolet aging tests were carried out on envelop material samples of civil aircraft body parts. The surface morphological changes and performance degradation of the envelop material verified the feasibility of the proposed accelerated environmental spectrum.