摘要
对多轴向振动环境下结构振动疲劳失效行为进行了试验研究,提出了2种多轴随机振动疲劳试验试件疲劳失效的判定方法。通过激光测振仪和35670A动态信号分析仪对结构的1阶固有频率进行跟踪监测,通过动态应变测试系统对试件缺口部位的应变进行了实时监测。根据试验数据,分析了多轴向振动环境下疲劳裂纹扩展与固有频率变化和应变变化的关系,确定了2种疲劳失效的试验判定准则,并对2种判定方法的适用性进行了讨论。
The fatigue failure characteristics of a structure under multi-axial random excitation presented in this paper have been researched,and two methods of determining the vibration-fatigue-life experiment are presented.A laser vibrometer and dynamic signal analyzer(35670A)are used to monitor the first order natural frequency,and the dynamic strain of the gap position on the structure is monitored using the dynamic strain measurement system in real time.Based on the investigation results,the relationship between the crack growth and the first order natural frequency as well as the strain variation are analyzed,two criteria for fatigue failure are determined,and the applicability of these two methods is discussed.This method lays the foundation for the multi-axial vibration fatigue experiment.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2015年第3期448-452,588,共5页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(11102083)
江苏高校优势学科建设工程资助项目
关键词
多轴向随机激励
振动疲劳
疲劳寿命
1阶固有频率
动态应变
multi-axial random excitation
vibration fatigue
fatigue life
the first order natural frequency
dynamic strain
