摘要
结构所受的真实载荷历程是实现疲劳寿命监控的核心。本文面向结构疲劳寿命在线监测提出了一种基于物理原型的疲劳载荷的反演和寿命评估方法。通过对潜在疲劳危险部位附近的应变场监测,依据结构疲劳危险部位的物理原型,反演结构所受外载荷;然后按照结构疲劳寿命分析方法获得结构的疲劳寿命。完成了一个耳片疲劳寿命在线监测试验,结果表明了本方法的可行性和有效性。
The actual load spectrum applied on structures is the key of the fatigue life monitoring. This paper presents a method of physical prototype centered assessment for fatigue life of structure based on on-line monitoring data. Firstly the load spectrums of fatigue hot regions are recorded by some sensors, then the load of the structure is inversely computed by physical prototype, finally the fatigue life of the structure is estimated according to the measured stress and strain history. A specimen of lug is tested and the strains of eight points near the hole are recorded, and then the fatigue life is estimated. The results show the feasibility and effectiveness of the proposed method.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2014年第3期335-340,共6页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(51275241)资助项目
机械结构力学及控制国家重点实验室(南京航空航天大学)自主研究课题(0213G02)资助项目
关键词
疲劳寿命
物理原型
在线监测
反演
耳片
fatigue life
physical prototype
monitoring on-line
inversion
lug
