摘要
为了评估复杂结构件在随机载荷作用下的疲劳可靠性,将含有多个疲劳细节的复杂结构件看作由多个只含有单一疲劳细节的单元构成的串联系统,在不做各个疲劳细节失效独立假设的前提下,根据疲劳可靠性异量纲干涉模型,提出了一种从系统层级上直接建立的复杂结构件疲劳可靠性模型。以某型列车枕梁为例,展示了随机载荷历程下含多个疲劳细节结构的疲劳可靠性预测方法及流程,并对其疲劳可靠性进行了分析。结果表明:在随机载荷作用下,提出的模型考虑了复杂结构件中疲劳细节之间失效的统计相关性,计算出的列车枕梁服役30年后的可靠度约为0.90,相比之下,传统的系统可靠性模型计算的可靠度偏于保守。
To evaluate the fatigue reliability of complex structures under random loads,a complex structure was treated as a series system composed of many units,each containing only a fatigue site,and a fatigue reliability model for complex structures was established based on the dissimilar-dimension interference model of fatigue reliability.The model was directly built at the system level without assuming independence of failures.Furthermore,the fatigue reliability evaluation of a train bolster was taken as an example to display the method and the process of fatigue reliability evaluation for complex structures.The results indicate that the fatigue reliability calculated by this new method considering the statistical correlation of failure among multiple fatigue sites in a complex structure under random loads is less conservative than using traditional methods,and the fatigue reliability of the bolster is about 0.90 in 30 years of service.
作者
胡杰鑫
谢里阳
尹伟
白恩军
吕骁
HU Jiexin;XIE Liyang;YIN Wei;BAI Enjun;LU Xiao(Key Laboratory of Vibration and Control of Aero-Propulsion Systems,Northeastern University,Shenyang 110819,China;Beijing Institute of Structure ＆ Environment Engineering,Beijing 100076,China;MieroPort Seientific Corporation,Shanghai 200120,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2018年第7期123-129,共7页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金重点资助项目(U1708255)
辽宁重大装备制造协同创新中心资助项目
关键词
疲劳细节
疲劳可靠性
串联系统
异量纲干涉模型
枕梁
fatigue site
fatigue reliability
series system
dissimilar-dimension interference model
bolster
