典型材料在腐蚀环境下裂纹扩展速率研究  

Study on Crack Growth Rate of Typical Materials in Corrosive Environment

作　　者：李万 张红飞 韩亮 赵连红 梅晓峰 李世龙 LI Wan;ZHANG Hong-fei;HAN Liang;ZHAO Lian-hong;MEI Xiao-feng;LI Shi-long(The Fifth Military Representative Office of the Naval Equipment Department in Wuhan,Wuhan,440205;China Special Vehicle Research Institute,Aviation Key Laboratory of Science and technology on Structural Corrosion Prevention and Control,Jingmen 448035;School of Aeronautic Science and Engineering,Beihang University Beijing 100083)

机构地区：[1]海装驻武汉地区第五军事代表室,武汉440205 [2]中国特种飞行器研究所结构腐蚀防护与控制航空科技重点实验室,荆门448035 [3]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《环境技术》2022年第6期17-22,共6页Environmental Technology

摘　　要：目的:研究7140-T7451厚板铝合金材料在腐蚀环境下的裂纹扩展速率。方法:通过开展7140-T7451厚板铝合金材料在室温大气、潮湿空气、3.5%NaCl溶液和油箱积存水4种环境下的裂纹扩展,采用Paris公式进行曲线拟合得到7140-T7451厚板铝合金在4种环境下的裂纹扩展曲线,并采用《民机结构耐久性与损伤容限设计手册》中方法,分析得到7140-T7451厚板铝合金在潮湿空气、3.5%NaCl溶液和油箱积存水3种腐蚀环境下的影响因子。结果:研究表明,3.5%NaCl溶液和油箱积存水对7140-T7451厚板铝合金裂纹扩展速率的影响较大。结论:对于7140-T7451铝合金材料,潮湿空气环境影响因子=0.88,3.5%NaCl溶液环境影响因子=0.73,油箱积存水环境影响因子=0.75。Objective: To study the crack growth rate of 7140-t7451 thick aluminum alloy in corrosive environment. Methods: By carrying out the crack propagation of 7140-t7451 thick plate aluminum alloy material in four environments including room temperature atmosphere, moist air, 3.5 % nacl saline water and fuel tank accumulated water, the curve fitting is carried out by using Paris formula to obtain its crack propagation curve in the four environments, and the method in Civil Aircraft Structure Durability and Damage Tolerance Design Manual is used to analyze and obtain the influence factors of 7140-t7451 thick plate aluminum alloy in the three corrosive environments including moist air,3.5 %NaCl saline solution and water accumulated in the fuel tank. Results: The research shows that 3.5 %NaCl saline solution and water accumulated in the fuel tank have a great influence on the crack growth rate of 7140-t7451 thick aluminum alloy plate. Conclusion: For 7140-t7451 aluminum alloy material,the environmental impact factor of moist air is =0.88, the environmental impact factor of 3.5 % NaCl saline solution is =0.73, and the environmental impact factor of water accumulated in the fuel tank is =0.75.

关 键 词：腐蚀环境 裂纹扩展速率 潮湿空气 3.5%NaCl溶液 油箱积存水 环境影响因子 

分 类 号：X828[环境科学与工程—环境工程]