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首页> 外文会议>International Conference on Stress Evaluation Using Neutrons and Synchrotron Radiation; 20070924-26; Vienna(AT) >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5091疲劳裂纹周围的应力场研究

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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：已经进行了许多理论研究来预测疲劳裂纹扩展尖端周围的应力场。然而，直到最近，应力的高度局部化，小规模性质还意味着无法直接进行测量。借助最新的同步加速器X射线源，现在可以实现亚毫米的采样尺寸，并且可以直接评估疲劳裂纹尖端的应力，并查看应力如何因过载而演变。 ， 例如。在本文中，我们给出了铝合金5091（Al-Mg-Li-C-O）疲劳裂纹周围应力场的同步X射线衍射分析结果。这是一种具有细晶粒尺寸的弥散强化合金，非常适合此类实验。准备了具有恒定振幅疲劳载荷的紧凑拉伸（CT）标本。能量色散X射线衍射（EDXRD）技术用于在原位载荷下沿着试样的中间厚度测量裂纹尖端周围的应变。该测量是在法国格勒诺布尔的ESRF（欧洲同步加速器辐射设施）上的ID15A光束线上进行的。实验裂纹尖端应力已与解析断裂力学解决方案进行了比较。

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