Determination of the Frictional Properties of Titanium and Nickel Alloys Using the Digital Image Correlation Method
Determination of the Frictional Properties of Titanium and Nickel Alloys Using the Digital Image Correlation Method
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DOI：
10.1007/s11340-010-9366-y
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发表时间：
2011-03
影响因子：
2.4
通讯作者：
M. Kartal;D. M. Mulvihill;D. Nowell;D. Hills
中科院分区：
文献类型：
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作者：
M. Kartal;D. M. Mulvihill;D. Nowell;D. Hills
本文描述了在典型工程条件下研究钛合金（Ti-6Al-4V）和镍合金（Udimet 720）的摩擦性能的实验。将具有圆角的平微动垫夹持在平试样上，并使用伺服液压拉伸试验机对试样施加循环位移。使用LVDT远程测量样本和垫之间的滑移位移，并使用数字图像相关性在本地进行测量。后一种方法允许从摩擦滞后回线精确确定切向接触刚度。所得结果表明，接触刚度明显低于光滑弹性接触分析所预测的刚度。实验接触几何的有限元模型的构建和它示出，良好的协议与接触刚度的实验测量可以得到一个合适的选择的弹性模量的顺应性表面层。
The paper describes experiments to investigate the frictional properties of a Titanium alloy (Ti-6Al-4V) and a Nickel alloy (Udimet 720) under representative engineering conditions. Flat fretting pads with rounded corners were clamped against a flat specimen and a servo-hydraulic tensile testing machine was used to apply cyclic displacement to the specimen. Slip displacement between the specimen and pad was measured remotely using an LVDT and locally using digital image correlation. The latter approach allowed accurate determination of the tangential contact stiffness from frictional hysteresis loops. The results obtained show that the contacts are significantly less stiff than would be predicted by a smooth elastic contact analysis. A finite element model of the experimental contact geometry was constructed and it was shown that good agreement with the experimental measurements of contact stiffness can be obtained with a suitable choice of elastic modulus for a compliant surface layer.