The relationship between acoustic emissions and wear particles for repeated dry rubbing

Wear ◽  
2008 ◽  
Vol 265 (5-6) ◽  
pp. 831-839 ◽  
Author(s):  
Alan Hase ◽  
Masaki Wada ◽  
Hiroshi Mishina
Keyword(s):  
Acoustic Emissions ◽  
Wear Particles ◽  
The Relationship

Investigation on the relationship between macropits and wear particles in a gear fatigue process

Wear ◽  
2021 ◽  
pp. 203724
Author(s):  
Haichuan Chang ◽  
Pietro Borghesani ◽  
Zhongxiao Peng
Keyword(s):  
Wear Particles ◽  
Fatigue Process ◽  
The Relationship

The stages in a process of severe metallic wear

1956 ◽  
Vol 236 (1205) ◽  
pp. 250-264 ◽  
Keyword(s):  
Wear Debris ◽  
Applied Load ◽  
Wear Particles ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Direct Production ◽  
Wear Process ◽  
Total Wear ◽  
The Relationship ◽  
Severe Type

In order to provide information about the basic processes involved in the wear of metals, a detailed study has been made of a severe type of wear. The particular system chosen was the wear of brass against a harder material under conditions in which the debris produced is metallic. Using radioactivity methods, transfer of metal between the rubbing surfaces was determined concurrently with measurements of the total wear. In experiments at various loads, the relationship between the rates of transfer and wear was studied. Particle-size distributions of the wear debris were obtained and compared with size distributions of the transferred fragments. It is concluded that wear occurs via a layer of transferred metal and that there is no direct production of loose wear particles. The wear process has at least two distinct stages; namely, the removal of metal from the wearing surface by transfer, and the formation of wear debris from the transferred layer on the opposing member. The magnitude of the applied load determines primarily the scale of the phenomena rather than the rate at which they occur.

scholarly journals ACOUSTIC EMISSION AND DAMAGE CHARACTERISTICS OF ANTHRACITE UNDER DIFFERENT CONDITIONS

2021 ◽  
Vol 55 (2) ◽  
pp. 213-218
Author(s):  
Jiyu Zheng ◽  
Xiaohua Jin ◽  
Kunyun Tian ◽  
Yinbo Zhou
Keyword(s):  
Acoustic Emission ◽  
Coal Sample ◽  
Characteristic Curve ◽  
Great Influence ◽  
Acoustic Emissions ◽  
Slow Increase ◽  
Loading Rates ◽  
The Relationship ◽  
Damage Characteristic ◽  
Peak Count

Acoustic emission (AE) can be used to observe the process of coal fracture propagation. Based on a press and acoustic-emission platform, the damage and acoustic-emission characteristics of anthracite with different loading rates, water amounts and sizes were studied. The results show that there is less acoustic emission in the initial compression stage of coal; acoustic emission is more active in the transition from elastic deformation to plastic deformation, which is manifested in the following aspects: the faster the loading rate, the higher is the number of acoustic-emission events; the peak count of acoustic emissions of a saturated-coal sample is significantly lower than that of a natural-coal sample. Coal samples and large coal samples emit even more sounds. Based on the normalization of acoustic-emission counts, the relationship between damage variables and stress-strain is studied, and it is characterized by an initial slow increase, followed by a rapid increase; however, different factors have a great influence on the damage-characteristic curve. The research results have a certain guiding significance for the coal and rock disaster prediction.

Study on Irrigation Model Based on Plant Ultrasonic Acoustic Emissions

2013 ◽  
Vol 330 ◽  
pp. 346-349
Author(s):  
Jian Xin Wang ◽  
Xian Wei Gao ◽  
Mei Li Sui ◽  
Xiu Ying Li
Keyword(s):  
Water Stress ◽  
Data Acquisition ◽  
Acoustic Emissions ◽  
Water Saving ◽  
Water Molecules ◽  
Effect Of Water ◽  
Irrigation Time ◽  
Conduit Wall ◽  
Cavitation Detection ◽  
The Relationship

Produced by cohesion between water molecules or adhesion to the conduit wall, the plant cavitation is accompanied by the vessel walls vibration which is the indicator of the water stress. The ultrasonic acoustic emissions (UAEs) are used to detect the plant cavitation events which are the transmission of vibration. The UAEs could be detected in ultrasonic frequencies between 100K Hz and 1 MHz. The PCI-2 data acquisition (DAQ) equipment and R15 sensors are used to improve the precision of cavitation detection. When the water stress and dehydration gets heavier, the UAEs rate gets higher. Use the tomato practice data with the empirical deduction under the modern greenhouse conditions, the UAEs and Transpiration Index (UAETI) and the UAEs Irrigation Index (UAEII) irrigation model are draw from the relationship between transpiration and UAEs. UAETI can be used to analysis the transpiration, and UAEII can be used to analysis the irrigation time. It is better to use UAEs technique to carry out automatic and precise irrigation for the plant and to improve the effect of Water-saving irrigation.

Wavelet Package for the In-Process Monitoring of Gas Metal Arc Welding Mild Steel

2011 ◽  
Vol 121-126 ◽  
pp. 3652-3656
Author(s):  
Ying Yao Ting ◽  
King Chu Hung ◽  
Yih Fong Tzeng
Keyword(s):  
Arc Welding ◽  
Operating Characteristic ◽  
Gas Metal Arc Welding ◽  
Acoustic Emissions ◽  
Classification Performance ◽  
Plasma Arc Welding ◽  
Audio Signals ◽  
Characteristic Parameters ◽  
Metal Arc Welding ◽  
The Relationship

The acoustic signals were strongly related to the behavior of the arc column, the molten pool and droplet transfer in gas metal arc welding(GMAW).In this study, all the work pieces (JIS SS400) were welded at the same speed with different currents using a gas metal arc; the purpose was to observe the relationship between these factors. Using a sound capture card and microphone we collected the audio signals generated by the welding. In this paper, wavelet package transformation (WPT) decomposes the sounds signals into 128 channels within the frequency domain. The properties of the audio signals were analyzed by the wavelet-based channel energy. The ROC (Receiver Operating Characteristic) parameters, (Ac, Se, Sp, ppv, and npv), were used for classification performance evaluation. Experimental results also show that acoustic emissions are useful in the quality control of plasma arc welding.

An investigation of the relationship between acoustic emissions and particle size

2012 ◽  
Vol 219 ◽  
pp. 111-117 ◽  
Author(s):  
Erin M. Hansuld ◽  
Lauren Briens ◽  
Amyn Sayani ◽  
Joe A.B. McCann
Keyword(s):  
Particle Size ◽  
Acoustic Emissions ◽  
The Relationship

scholarly journals The Relationship between Wear Phenomena and Wear Particles of Cast Iron

1970 ◽  
Vol 56 (9) ◽  
pp. 1245-1252
Author(s):  
Kazuo KITAGAWA ◽  
Fumio SEKI ◽  
Masuzo UEDA
Keyword(s):  
Cast Iron ◽  
Wear Particles ◽  
The Relationship

scholarly journals The temperature- and density-dependent acoustic emission response of snow in monoaxial compression tests

2004 ◽  
Vol 38 ◽  
pp. 291-298 ◽  
Author(s):  
Carlo Scapozza ◽  
Felix Bucher ◽  
Peter Amann ◽  
Walter J. Ammann ◽  
Perry Bartelt
Keyword(s):  
Acoustic Emission ◽  
Relaxation Times ◽  
Acoustic Emissions ◽  
Wide Band ◽  
Strain Rates ◽  
Compression Tests ◽  
Load History ◽  
Fine Grained ◽  
Rate Controlled ◽  
The Relationship

AbstractResults of acoustic emission tests on cylindrical specimens under compression are reported. Deformation-rate-controlled tests with strain rates ranging from 1.1 × 10-6 s-1 to 2.6 × 10-3 s-1 at temperatures between T = -11.2°Cand T = -1.7°C were performed. The investigated snow was fine-grained, with a density varying between 220 and 380 kgm-3. The acoustic emission was measured with two distinct piezoelectric sensors: a wide-band sensor (frequency 100–1000 kHz) and a resonant sensor (frequency 35–100 kHz). The relationship between the applied strain rate and the measured maximum acoustic-emission rate as a function of temperature and density was found to obey a power law, which is valid for the ductile behaviour range. The quantitative and qualitative effects produced on the acoustic emissions during the transition from ductile to brittle behaviour, occurring at strain rates of approximately 1 × 10-3 s-1, are reported. Finally, the influence of the load history on the acoustic emissions of snow is discussed on the basis of a cyclic test, including deformation-controlled loading steps and relaxation steps, performed at different strain rates and different relaxation times.

scholarly journals Acoustic Emission Waveform Changes for Varying Seeded Defect Sizes

2006 ◽  
Vol 13-14 ◽  
pp. 427-432 ◽  
Author(s):  
S. Al-Dossary ◽  
R.I. Raja Hamzah ◽  
D. Mba
Keyword(s):  
Acoustic Emission ◽  
Acoustic Emissions ◽  
Defect Size ◽  
Geometric Size ◽  
The Relationship ◽  
Geometric Defect

The investigation reported in this paper was centered on the application of the Acoustic Emissions (AE) technology for characterising the defect sizes on a radially loaded bearing. The aim of this investigation was to ascertain the relationship between the duration of AE transient bursts associated with seeded defects to the actual geometric size of the defect. It is concluded that the geometric defect size can be determined from the AE waveform.

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