Frictional Response of PTFE Sliding Bearings at High Frequencies
Frictional Response of PTFE Sliding Bearings at High Frequencies
复制标题
PTFE 滑动轴承在高频下的摩擦响应
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
A. Filiatrault
中科院分区：
文献类型：
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作者：
Gaël Bondonet;A. Filiatrault
对聚四氟乙烯(PTFE)滑移桥轴承进行了动态试验，以评估其在1 Hz以上频率下的摩擦特性。聚四氟乙烯支座的高频地震响应预计将发生在北美东部的桥梁结构中，那里的地面运动估计远远超过1赫兹。三种不同的PTFE-钢界面在0.02~5 Hz的频率范围内进行了试验，位移幅度高达±70 mm，在5~45 MPa的围压下进行了试验。实验结果表明，在达到动态、稳态摩擦行为之前，在1赫兹以上的频率处有显著的初始瞬时摩擦响应。这种暂态响应的特征是初始的高静态摩擦系数，在几个响应循环后缓慢下降到动态稳态摩擦系数。建议对现有的摩擦数学模型进行修正，以考虑这种初始的瞬时摩擦。
Dynamic tests were done on polytetrafluoroethylene (PTFE) sliding bridge bearings to evaluate their frictional characteristics at frequencies above 1 Hz. High frequency seismic responses of PTFE bearings are expected to occur in bridge structures in eastern North America, where the estimated ground motion is well above 1 Hz. Three different PTFE-steel interfaces were tested at frequencies ranging from 0.02 Hz to 5 Hz, with displacement amplitudes of up to ±70 mm and under confining pressures ranging from 5 MPa to 45 MPa. The experimental results showed a significant initial transient frictional response at frequencies above 1 Hz before the dynamic, steady-state, frictional behavior was achieved. This transient response is characterized by an initial high static coefficient of friction that slowly decreases to a dynamic steady-state coefficient of friction after several response cycles. Modifications to an existing mathematical friction model are proposed to take into account this initial transient frictio...