Abstract
Abstract A multi-physical signal correlation analysis method is proposed to identify the different tribological properties of materials. The acoustic emission (AE), contact resistance, and frictional force behaviors during dry sliding between four metals, 45# carbon steel, YG12 carbide, 2A12 aluminum alloy, and H62 brass, have been studied. Both positive and negative correlations between the root mean square of the amplified AE (AE RMS) signal and the frictional coefficient have been found in the experiments. In addition, the AE RMS signal and the contact resistance changed with changing sliding speed and normal load in different ways. The different correlation behaviors have been attributed to diverse tribological states under different experimental conditions due to different material characteristics. The correlation analysis provides a new method of quantitatively identifying the tribological states and the AE sources during frictional interaction. The observed anomalous correlations between the AE signal and frictional coefficient should be properly considered according to the different material properties during industrial friction condition monitoring using AE technology.
Highlights
Because the interfacial friction process is quite complex and the states of the mating surfaces cannot be observed directly, researchers have been committed to developing various experimental methods and equipment to study the nature of this process
The correlation analysis among acoustic emission (AE), contact resistance, and the frictional coefficient indicate that different correlations correspond to different tribological behaviors of the materials
With consideration for various industrial processes such as cutting and grinding and commonly used mechanical components that are closely related to tribology, four metals were used in our tribological tests, namely, 2A12 aluminum alloy, H62 brass, 45# carbon steel, and YG12 carbide
Summary
Because the interfacial friction process is quite complex and the states of the mating surfaces cannot be observed directly, researchers have been committed to developing various experimental methods and equipment to study the nature of this process. Quartz crystal microbalance [8−10] was developed to study the tribological characteristics of a single-layer molecular film under boundary lubrication. Several microscopic techniques, such as scanning electron microscopy (SEM) [11] and white light interferometry [12], have been used for. Theoretical models have been established in an effort to calculate the AE power expended during frictional interaction [27, 28] Another physical signal measured in the present study was the contact electrical resistance, which is closely related to the contacting state. To link various physical phenomena to the microscopic mechanism of friction, a correlation analysis method is proposed in this paper to quantitatively determine the different tribological states during dry sliding. The correlation analysis among AE, contact resistance, and the frictional coefficient indicate that different correlations correspond to different tribological behaviors of the materials
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