2004, Volume 6, Issue 4
Strategic Study of CAE >> 2004, Volume 6, Issue 4
The S-N Curve Fitted by the Least Square Method Considering the Effect of Length of the Confidence Interval
1. Naval Aeronautical Engineering Institute Qingdao Branch , Qingdao , Shandong 266041 , China
2. Nanjing Aeronautical University , Nanjing 210016 , China
Next Previous
Abstract
The S-N curve is the base of calculating fatigue structural life. Founding on physical mechanism, this paper presents a weighted least square method in which the weigh of a group of test data is inversely proportional to the length of the confidence interval. The calculating results show that the S-N curve which is gained by the least square method considering the effect of length of the confidence interval is more reliable and secure than the S-N curve which is gained by general least square method.
Keywords
confidence interval ; fatigue life ; least square method ; S-N curve
Figures
图1
图2
图3
图4
References
[ 1 ] 高镇同.疲劳可靠性[M ].北京:北京航空航天大学出版社, 2002 link1
[ 2 ] 高镇同, 蒋新桐, 熊峻江.疲劳性能试验设计和数据处理———直升机金属材料疲劳性可靠性手册[M ].北京:北京航空航天大学出版社, 1999
京公网安备 11010502051620号
