Dynamic contact strain measurement by time‐resolved stroboscopic energy dispersive synchrotron X‐ray diffraction
Dynamic contact strain measurement by time‐resolved stroboscopic energy dispersive synchrotron X‐ray diffraction
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通过时间分辨频闪能量色散同步加速器 X 射线衍射测量动态接触应变
DOI：
10.1111/str.12221
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发表时间：
2017
期刊：
影响因子：
2.1
通讯作者：
Thomas Connolley
中科院分区：
文献类型：
--
作者：
Mahmoud Mostafavi;David M. Collins;Matthew J. Peel;Christina Reinhard;S. Barhli;R. Mills;Matthew Marshall;R. Dwyer;Thomas Connolley
同步加速器X射线源和专用高能光束线的最新发展现在可以对大量工业相关金属材料进行应变测量。这种能力允许验证新的和替代的非破坏性实验方法的应变测量或复杂变形过程的计算模型。这项研究描述了使用频闪能量色散X射线衍射首次测量滚珠轴承的动态接触应变。对试验轴承外滚道的动态接触应变进行了实验研究。轴承的内滚道连接到以每分钟150转旋转的轴上，并且进行测量的外滚道固定在固定的轴承箱中。触发系统用于使能量色散X射线衍射检测器的数据采集与轴承旋转同步。具体而言，当球直接位于滚道下方时，在已知位置从滚道内的材料体积中频闪采集衍射数据。总共记录了20 s的累积衍射信号，每转采集2 ms的数据，为待测量的动态接触应变提供足够质量的衍射图案。宏观力学应力场计算从微观力学应变测量从五个晶格平面。这允许的实验测量的应力场和有限元模拟的比较。有限元结果和实验测量之间观察到良好的一致性，表明这种新的动态应变测量技术的摩擦学系统的适用性。
Recent developments of synchrotron X‐ray sources and dedicated high‐energy beamlines are now enabling strain measurements from large volumes of industrially relevant metallic materials. Such capability is allowing the validation of novel and alternative nondestructive experimental methods of strain measurement or computational models of complex deformation processes. This study describes the first dynamic contact strain measurement of a ball bearing using stroboscopic energy dispersive X‐ray diffraction. The experiment probed the dynamic contact strain in the outer raceway of a test bearing. The inner raceway of the bearing was attached to a shaft rotating at 150 revolutions per minute, and the outer raceway, where the measurements were made, was fixed in a stationary bearing housing. A triggering system was used to synchronise the data acquisition of the energy dispersive X‐ray diffraction detector with the bearing rotation. Specifically, diffraction data were acquired, stroboscopically, from the material volume within the raceway, in a known location, when the ball was positioned directly below it. A total of 20 s of accumulated diffraction signal was recorded, acquiring 2 ms of data per revolution, providing diffraction patterns of sufficient quality for the dynamic contact strain to be measured. Macromechanical stress field was calculated from the micromechanical strains measured from five lattice planes. This allowed a comparison of the experimentally measured stress field and that of finite element simulations. Good agreement was observed between the finite element results and experimental measurements indicating the applicability of this novel dynamic strain measurement technique for tribological systems.
通过衍射实验表征正交切割 C45E 钢样品切屑形成区的空间分辨微观结构特征
影响因子：
6.3
作者：
Brömmelhoff;Gerstenberger;Fischer;Schell;Uhlmann;Reimers
通讯作者：
Reimers