摘要
针对金属材料疲劳断裂研究的现状以及实际应用中应力比r的变化情况,分析了应力比r对金属疲劳裂纹萌生和扩展的影响。运用Pro/E设计了一种新型高低频复合振动装置,对其空载运动状态下的动力学特性做了理论分析。建立了振动装置加载金属材料时的动力学模型,以加载7A09高强度铝合金为算例,运用ANSYS对模型进行谐波分析,得到了此种情况下的幅频特性曲线图,并由此获得了在该状态下最易发生疲劳断裂的变频区间。
According to the research status on fatigue fracture of metal materials and the changes of the stress ratio r in practical application,it analyzes the effect of stress ratio r on metal fatigue crack initiation and propagation.It develops a new type of high and low frequency composite vibration device,establishes the dynamic model of the vibration device loading metal materials. Taking 7A09 high strength aluminum alloy as an example,it calculates the amplitude- frequency characteristic curve,obtains the harmonic analysis of the model and illustrates the frequency variation range to fatigue fracture.
出处
《机械设计与制造工程》
2016年第2期90-94,共5页
Machine Design and Manufacturing Engineering
基金
中央高校基本科研业务费专项资金资助项目(JUSRP11008)
关键词
高低频复合振动
金属材料疲劳
动力学模型
变频区间
high and low frequency composite vibration
fatigue of metal materials
dynamic model
frequency variation range
