TiNi形状记忆合金的滑动摩擦噪声特性研究

利用销-盘磨损试验机以及振动加速度传感器和精密声级计,研究了TiNi形状记忆合金在不同相结构下的滑动摩擦噪声特性.结果表明:由于磨损造成摩擦表面形貌恶化,使摩擦力值增大,且波动剧烈,急剧变化的摩擦力对摩擦系统不断输入能量,引起系统产生自激振动,向环境中辐射噪声.母相时,TiNi合金阻尼性能相对马氏体较低,只能通过良好的耐磨性而保持磨损面形貌恶化速度较慢,从而延缓摩擦啸叫的产生;母相/马氏体相共存时,合金有很高的阻尼性能,具有很好的减振降噪性能;马氏体态时由于TiNi合金销试样接触刚度下降,导致系统失稳,产生激振,引发高频噪声.

Performance of TiNi Shape Memory Alloy on Suppressing Friction-induced Vibration and Squeal under Sliding Conditions

Using pin-on-disc wear test rig equipped with acceleration sensors and precious noise meter, the characteristics of friction-induced squeal between the rubbing-pairs of TiNi/GCr15 was studied. The experimental results show that the wear deteriorates the topography of rubbing surface, which makes friction force not only rising but also fluctuating acutely. The fluctuating friction force is responsible for the self-excited vibration of tribo-system since it continuously supplies tribo-system with energy. The noise-suppressing property of TiNi alloy is greatly dependent on its phase structure, because the parent phase, co-existence of parent phase and martensite phase, martensite phase has different tribological and damping property, which strongly influence the performance of TiNi alloy on decreasing or suppressing friction-induced vibration and squeal under sliding conditions.