Acoustic Emission and Its Relationship with Friction and Wear for Sliding Contact

Abstract

Further investigation of the relationships between friction and wear properties and the characteristics of acoustic emission was conducted in the case of dry and grease-lubricated sliding contact using a ball-on-cylinder testing apparatus. The effect of contamination simulated by the inclusion of glass bead particles was also explored. Experiments were performed at sliding speeds ranging from 0.09 m/s to 1.47 m/s, while maintaining a fixed load and duration. As a first observation and contrary to what could be expected, the higher speed did not contribute to the decrease in friction interpreted by a worsening of the starved regime that had a consequence of increasing wear. However, the results revealed a good correlation between the friction coefficient and acoustic emission (AE) rms voltage for dry sliding. Such a relationship may allow the prediction of a reasonable friction coefficient µ from an AE signal. It was also determined that the friction work correlated well with the corresponding integrated AE voltage over time, intRMS. The detection of the sliding speed threshold beyond which accelerated wear would occur was possible from the intRMS variation. Proportionality between the theoretically determined grease film thickness and the intRMS was observed.

An analysis of pounding mitigation and stress waves in highway bridges with shape memory alloy pseudo-rubber shock-absorbing devices

“…Compared with the original model bridge, the dominant frequency of the stress waves of the AE sensors on bridge decks increased from 2.21 × 10 4 Hz to a wide band of frequencies between 2.21 × 10 4 and 1.60 × 10 5 Hz. A reasonable explanation for the high‐frequency components of the stress waves in the controlled bridge model is that they were caused by acoustic emissions related to the internal friction . However, the energy spectrum's density decreased from 460 to only 4.5; therefore, the effect of friction‐induced acoustic emissions was neglected in the analysis.…”

Monitoring friction related surface degradation using acoustic emission technique

“…Baranov et al [6] developed a model for determining the parameters of AE accompanying contact friction of solids. Investigation of relationships between friction and characteristics of acoustic emission was conducted using a ball-on-cylinder testing apparatus [7]. Hutson et al [8] studied fretting fatigue caused by subjecting surfaces to high number of cyclic friction loads.…”

Characterisation of acoustic emissions for the frictional effect in engines using wavelets based multi-resolution analysis

“…These processes of friction and wear generate high-frequency AE stress waves predominantly pseudo-continuous with superimposed burst emissions due to sporadic high-amplitude events such as single asperity fracture, particle interactions [9]. The excessive friction and wear on pistons, cylinder liners and piston rings are also sources of AE.…”