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用动态力学分析仪(DMA)的三点弯和双悬臂方法测量FeCrMoCu合金的阻尼性能,通过ABAQUS有限元模拟分析测量过程中试样的应力分布,研究了应力对FeCrMoCu合金阻尼行为的影响。结果表明:测量阻尼时预载荷使样品产生应力集中,使样品的磁畴壁发生移动从而降低了合金的阻尼性能。应力越大磁畴的可动性越低,对合金阻尼性能的影响也越大。应力的加载方式也对FeCrMoCu合金阻尼性能有较大的影响,预载荷使双悬臂模式下样品上下表面都受到压应力,因此需要较大的应力才能使样品的磁畴结构达到饱和。其结果是对应的应变振幅εmax较大,测得的最大阻尼性能Q-m1ax偏低。而三点弯测试时,由于上下表面分别受到压应力和拉应力,应力的叠加使合金磁畴达到饱和的应变振幅εmax较小,测得的Q-m1ax较大。
The damping properties of FeCrMoCu alloy were measured by dynamic three point bending and double cantilever method. The stress distribution of FeCrMoCu alloy was analyzed by ABAQUS finite element simulation. The influence of stress on the damping behavior of FeCrMoCu alloy was studied. The results show that the pre-load in the measurement of damping causes stress concentration on the sample, which causes the magnetic domain walls of the sample to move, which reduces the damping capacity of the alloy. The higher the stress, the lower the mobility of the magnetic domain, the greater the impact on the damping performance of the alloy. The stress loading also has a great influence on the damping capacity of the FeCrMoCu alloy. The preload makes the upper and lower surfaces of the sample have compressive stress under the dual cantilever mode, so the larger the stress is needed to saturate the magnetic domain structure of the sample. As a result, the corresponding strain amplitude ε max is large, and the maximum measured damping capacity Q-m1 ax is low. The three-point test, the upper and lower surfaces were subjected to compressive stress and tensile stress, stress superimposed so that the magnetic domain saturation of the alloy strain amplitude εmax smaller, the measured Q-m1ax greater.