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首页> 外文会议>International Conference on Stress Evaluation Using Neutrons and Synchrotron Radiation >Investigation of the stress fields around a fatigue crack in aluminium alloy 5091
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Investigation of the stress fields around a fatigue crack in aluminium alloy 5091

机译：铝合金疲劳裂纹围绕疲劳裂纹的应力场调查5091

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There have been many theoretical studies to predict the stress fields around the tip of a growing fatigue crack. However, until recently the highly-localized, small scale nature of the stresses has meant that direct measurement has not been possible. With the current generation of synchrotron X-ray sources, sub-millimetre sampling dimensions are now possible, and it has become possible to evaluate directly the stresses at the tip of a fatigue crack and to see how the stresses evolve as the result of an overload, for example. In this paper we present results of synchrotron X-ray diffraction analysis of the stress fields around a fatigue crack in aluminium alloy 5091 (Al-Mg-Li-C-O); this is a dispersion-strengthened alloy with a fine grain size, which makes it ideal for such experiments. Compact tension (CT) specimens were prepared with constant amplitude fatigue loading. The energy dispersive X-ray diffraction (EDXRD) technique was used for measuring strains around the crack tip along the mid thickness of the specimen under in-situ loading. The measurement was carried out at the ESRF (European Synchrotron Radiation Facility), Grenoble, France on the ID15A beam line. The experimental crack tip stresses have been compared with the analytical fracture mechanics solution.
机译：已经有许多理论研究来预测周围越来越疲劳裂纹尖端的应力场。然而，直到最近应力的高度本地化，规模小自然意味着直接测量已不可能。与电流产生的同步辐射X射线源，亚毫米波采样尺寸现在是可能的，它已成为可能在疲劳裂纹的前端，以评估直接的应力和看到的应力如何演变为过载的结果， 例如。在本文中，我们周围的铝合金疲劳龟裂的应力场的同步辐射X射线衍射分析的本发明的结果5091（Al-Mg系锂-C-O）;这是具有细晶粒尺寸，这使得它非常适合这样的实验的分散强化合金。紧凑拉伸（CT）试样具有恒定振幅疲劳负载制备。用于下原位加载测量以沿着中间厚度的样品的裂纹尖端的菌株的能量色散型X射线衍射（EDXRD）技术。测定是在ESRF（欧洲同步辐射装置），法国Grenoble进行对ID15A束线。实验裂纹尖端的应力已被与解析断裂力学溶液进行比较。

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