基于物理原型的结构疲劳寿命评估方法

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。

Physical Prototype Centered Assessment for Fatigue Life of Structure

The actual load spectrum applied on structures is the key of the fatigue life mo nitoring. This paper presents a method of physical prototype centered assessment for fatigue life of structure based on on-line monitoring data. Firstly the lo ad spectrums of fatigue hot regions are re corded by some sensors, then the load of the structure is inversely computed by physical prototype, finally the fatigue life of the structure is estimated a ccording to the measured stress and strain history. A specimen of lug is tested and the strains of eig ht points near the hole are recorded, and then the fatigue life is estimated. The results show the feasibility and effectiveness of the proposed method.