摘要
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。
Three point bending and dual cantilever model of dynamic mechanical analyzer （DMA） were used to measure the damping capacity of FeCrMoCu alloy, and ABAQUS software was selected to analysis the stress distribution of sample during damping test. The influence of stress on damping behav- ior of FeCrMoCu alloy was studied. The results show that there obviously exists stress concentration due to pre-load during damping test, which will cause the move of magnetic domain wall. With increasing stress, the mobility of domain wall will be lowered and the damping capacity of FeCrMoCu alloy decreas- es obviously. There is obvious influence of stress loading mode on damping behavior of FeCrMoCu alloy. For dual cantilever model, there always exists compressive stress at the upper and lower surface of test sample and a greater stress is needed to saturate domain structure. Therefore, the strain amplitude Еmax is bigger and the maximum damping capacity Q^-1max is lower. While 3 point bending model was used to test damping capacity, in the upper and lower surface of sample there exist compressive stress and ten- sile stress respectively. During damping test, the imposed stress will lead to overlay effect. The magnetic domain structure will saturate at lower strain amplitude Еmax and the maximum damping capacity Q^-1max is higher.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2013年第3期225-230,共6页
Chinese Journal of Materials Research
