博物馆文物微振疲劳试验与分析研究

Slight fatigue tests and numerical analysis for museum collections

地铁诱发振动对博物馆文物的影响属微振动疲劳损伤,为保证文物安全,开展地铁振动对馆藏文物影响的试验研究与数值分析。进行文物材料静力试验、疲劳试验和相应有限元计算分析,深入分析文物材料的力学性能变化规律、静力及动力效应。研究结果表明：文物材料静力强度介于5~28 MPa;疲劳试验频率设定于10~20 Hz,在交变荷载峰值为自身静力强度30%的换算荷载作用下,文物材料能够经受100万次疲劳振动不发生破坏;环境振动速度幅值为1 mm/s时,在1~80 Hz频率范围内,文物模型最大动应力值远小于其疲劳强度,不会发生微振动损伤;频率一定时,速度幅值与文物模型最大动应力值呈线性增加关系,故可以通过限制振动速度幅值来控制文物动应力值,保证博物馆文物的安全。

The effects of vibration caused by metro on museum collections lead to their slight fatigue damage. To ensure the safety of collections,here the effects of vibration caused by metro on museum collections were tested and analyzed. This paper based on the date of museum collections in static and fatigue test and the analysis of finite element model. Through analyzing changes in mechanical properties and dynamic effects of museum collections,the results showed that their material static strength range is within 5 ~ 28 MPa; their fatigue test frequency range is placed from 10 to 20 Hz;under the action of the alternating peak load being 30% of their static strength,they can bear the fatigue vibration for1000 thousand cycles; when the amplitude of velocity is 1mm / s,within a frequency range of 1 to 80 Hz,the maximum dynamic stress of their models is much smaller than their fatigue strength,their slight fatigue damage do not occur; when the vibration frequency is certain,the amplitude of vibration velocity and their model＇s maximum dynamic stress increase linearly; to ensure the safety of artifacts,their vibration velocity can be restricted to control their dynamic stresses.