腐蚀对30CrMnSiNi2A钢结构疲劳寿命的影响

采用周期浸润加速腐蚀试验与疲劳试验相结合的方法,研究了腐蚀及腐蚀与疲劳交替作用对某型飞机30CrMnSiNi2A机翼主梁疲劳寿命的影响.结果表明,腐蚀环境的影响会引起30CrMnSiNi2A高强度结构钢的疲劳寿命明显降低.与未腐蚀状态相比,预腐蚀5、10、15天后,某型飞机机翼主梁模拟件的平均疲劳寿命分别下降了17.3%、20.5%、33.2%;而在腐蚀与疲劳交替作用下,其平均疲劳寿命下降了22.8%.在给定的腐蚀环境和疲劳载荷谱作用下,平均疲劳寿命N50随预腐蚀时间t的变化可以用N50=1044.541-219.978t描述.

Influence of Corrosion on Fatigue Life of 30CrMnSiNi2A Steel Structure

The influence of corrosion and corrosion fatigue alternative action on the fatigue life of the main beam made of 30CrMnSiNi2A of a certain type aircraft wing was studied using the cyclic soaking accelerated corrosion test and fatigue test combination method. The results showed that, the influence of corrosion environment can reduce obviously the fatigue life of 30CrMnSiNi2A, which is a high strength structure steel. Compared with the no corrosion condition, the mean fatigue life N50 of the specimen simulated the main beams of wing of a certain type aircraft dropped 17.3%, 20.5%, and 33.2% separately after pre-corrosion 5 days, 10 days, and 15 days. And the mean fatigue life dropped 22.8% under the corrosion and fatigue alternately influence. The relationship between the mean fatigue life and the pre-corrosion time can be described as under the given corrosion environment conditions and the fatigue loading spectrum.