腐蚀环境下2024-T3铝合金疲劳裂纹扩展和剩余强度实验研究  

Experimental Study on Fatigue Crack Growth and Residual Strength of Aluminium Alloy 2024-T3 Under Mixed Corrosive Environments

作　　者：秦剑波[1] 王生楠[1] 刘亚龙[1] 刘一兵[1] 周岳泉[1] 

机构地区：[1]西北工业大学飞机结构强度研究所,西安710072

出　　处：《材料工程》2006年第3期14-17,共4页Journal of Materials Engineering

摘　　要：对2024-T3铝合金在5种典型实验室环境和3种组合环境下的疲劳裂纹扩展和剩余强度进行了实验研究。通过实验获得的裂纹扩展数据,对Paris公式进行条件拟合,得到各种环境下的裂纹扩展常数,并作了对比分析。结果表明,腐蚀环境的参与使2024-T3铝合金的疲劳裂纹扩展速率明显加快,不同腐蚀环境对疲劳裂纹扩展速率的影响程度不同,其影响的严重程度由重到轻依次为:油箱结构区、厨房与厕所、油箱积存水、盐水、潮湿空气、高空环境、干燥空气。实验数据还进一步表明,腐蚀介质对临界裂纹长度的影响很小,说明环境对剩余强度能力无直接影响。The effects of five single and three mixed corrosive environments on the fatigue crack growth and residual strength of aluminium alloy 2024-T3 were experimentally studied. The crack growth rates in corrosive environments, obtained by using Paris equation, were compared with crack growth rate in lab air. The results showed that the interactions of aggressive environments with fatigue loads caused the accelerations of fatigue crack growth rates in aluminium alloy 2024-T3. But the effects of various environments on the fatigue crack growth rate are different. Among the environments the most detrimental one was oil-box zone, followed by cookroom＆washroom, tank seeper, 3.5%NaCl, moist air, high altitude and dried air. Also, the test data show the less effects of various corrosive environments on critical crack length, that is, no direct influence of corrosive environments on residual strength capability dominated by fracture toughness.

关 键 词：腐蚀环境 2024-T3铝合金 实验 裂纹扩展速率 剩余强度 

分 类 号：TG172.9[金属学及工艺—金属表面处理]