摘要
通过分析影响裂纹扩展寿命的多个随机因素 ,就目前较为常用的裂纹扩展寿命安全可靠性分析模型进行比较 .在此基础上 ,本文提出了一种新的模型———裂纹扩展寿命～断裂韧度可靠性分析模型 ,该模型基于目前比较公认的裂纹扩展寿命分布和断裂韧度分布特性 ,为工程界进行含裂纹结构的概率损伤容限评估提供一定的理论依据 .
An accelerated corrosion environmental spectrum was introduced to test the surface coatings of the critical areas of flight aircraft structures. The spectrum is composed of hot humid environment?ultraviolet radiation?thermal impingement?low temperature fatigue and salt spray. One single cycle of the spectrum was supposed to be equal to one year experience in ground environment. In combination with the actual environment of marine and hot humid area in China, concrete conditions for hot humid and thermal impingement tests were developed. The proportions of neutral and acidic salt sprays, the ultraviolet radiation time and the method of determining low temperature fatigue stress levels were established. The programming of the accelerated environmental spectrum was conducted by combining the corrosion critical areas of ×× flight aircraft. The equivalent relations that single cycle represents one year in marine and hot humid areas were verified by comparing the corrosion degrees between the accelerated corrosion environmental spectrum and ground environmental spectrum.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2002年第1期113-115,共3页
Journal of Beijing University of Aeronautics and Astronautics
基金
广东省自然科学基金资助项目 (960 2 5 5 )
