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Cold expansion process on hard alloy holes-experimental and numerical evaluation

机译：硬质合金孔的冷膨胀过程-实验与数值评估

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This paper presents an evaluation of the influence of the cold expansion process on the fatigue performance of holes in hard alloys, as such materials are involved in an increasing number of aeronautical applications. Fatigue enhancement could bring significant savings for numerous possible industrial applications. However, although the cold expansion of aluminium holes has been studied widely, there have been few publications concerning this process in hard alloys and there is currently very few research activities on technique dedicated to high strength metallic holes. Thus, this work aims to define an approach to understand why processes and methodologies are suitable for obtaining effective expansion of these materials. In this article, the response of expanded holes is studied, considering various experimental parameters and for a wide range of expansion ratios. The influence on the fatigue strength of Ti-6Al-4V tensile specimens is also reported for various expansion ratios, more precisely "standard" expansion ratios and high expansion ratios. Then, a specific numerical modelling of the process is presented, which enables us to understand the impact of high expansion ratios in titanium holes and the influence on fatigue performance. A very good correlation between experimental and numerical results is observed.
机译：本文对冷膨胀过程对硬质合金中孔的疲劳性能的影响进行了评估，因为此类材料涉及越来越多的航空应用。疲劳增强可以为许多可能的工业应用带来可观的节省。然而，尽管已经对铝孔的冷膨胀进行了广泛的研究，但是关于这种在硬质合金中的方法的出版物很少，并且目前很少有研究致力于高强度金属孔的技术。因此，这项工作旨在定义一种方法，以理解为什么工艺和方法学适合于获得这些材料的有效扩展。在本文中，研究了扩展孔的响应，考虑了各种实验参数并针对广泛的扩展率。对于各种膨胀率，更准确地说是“标准”膨胀率和高膨胀率，也报告了对Ti-6Al-4V拉伸试样的疲劳强度的影响。然后，给出了该过程的特定数值模型，使我们能够了解钛孔中高膨胀比的影响以及对疲劳性能的影响。观察到实验结果与数值结果之间有很好的相关性。

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