A new piezoelectric fatigue testing machine in pure torsion for ultrasonic gigacycle fatigue tests: application to forged and extruded titanium alloys
A new piezoelectric fatigue testing machine in pure torsion for ultrasonic gigacycle fatigue tests: application to forged and extruded titanium alloys
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DOI：
10.1111/ffe.12340
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发表时间：
2015-11-01
影响因子：
3.7
通讯作者：
Palin-Luc, T.
中科院分区：
文献类型：
--
作者：
Nikitin, A.;Bathias, C.;Palin-Luc, T.
本文结合工业需求，简要讨论了超声波疲劳测试方法的发展历史。超声波技术的发展和计算机工业的进步导致了超声波检测技术的改进。事实证明，现有的超声波测试系统存在局限性，导致需要一种在纯扭转下运行的新型超声波疲劳测试机。本文介绍了一种在连续状态（即无脉冲暂停）下工作的新型压电机器的开发。该机器用于研究通过锻造和挤压两种制造工艺生产的 VT3-1 αβ 航空钛合金（类似于 Ti-6Al-4V）的超高周疲劳 (VHCF) 性能。与锻造钛合金相比，挤压钛合金具有更高的 VHCF 扭转强度。尽管在扭转载荷下试样表面出现最大剪切应力，但在锻造和挤压合金中都可以观察到内部疲劳裂纹的萌生。
This article briefly discusses the history of the development of ultrasonic fatigue testing methods, with respect to industrial needs. The development of ultrasonic techniques and the progress made in the computer industry have led to improvements in ultrasonic testing techniques. It has been shown, that existing ultrasonic testing systems have limitations that lead to the need for a new ultrasonic fatigue testing machine operating in pure torsion. This paper introduces the development of a new piezoelectric machine working in the continuous regime (i.e. without pulse-pause). This machine has been used to investigate the Very High Cycle Fatigue (VHCF) properties of the VT3-1 alpha beta aeronautical titanium alloy (which is similar to Ti-6Al-4V) produced by two manufacturing processes: forging and extrusion. The extruded titanium alloy has a higher VHCF strength in torsion compared to the forged one. Despite the maximum shear stress occurring at the specimen surface under torsion loading, internal fatigue crack initiation can be observed in both the forged and extruded alloys.