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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/225

Title: Acoustic emission in dynamic compression and its relevance to tribology
Authors: Ravi, Doraiswami
Sethuramiah, A
Keywords: acoustic emission
microcracks
ringdown counts
peak amplitude
Issue Date: 1995
Citation: Tribology lnternational, 28 (5), 301-306
Abstract: In the present work an acoustic emission (AE) technique is used to detec: the initiation and propagation of short cracks in compressive cyclic loading. A mild steel surface was subjected to cyclic compressive stress of 100 cycles s’ by an electromagnetic exciter system. The compressive load applied was in the range of 2.5 to 25 N in each cycle. The stressing was done with an En31 steel ball in the presence of turbine oil. Acoustic emission was deteced by placing an AE sensor 1.5 cm away from the point of contact of ball and plate. The surface damage was observed to be negligible until IO4 cycles. Microcrack nucleation and/or growth were inferred until 0.6 x IO5 cycles. Thereafter the acoustic emiss,ion activity decreased, suggesting possible arrest mechanisms were operating. The emission activity again became very significant beyond 6.0 x IO5 cycles, which may be due to possiole subsurface crack growth. This information is related to previous one-pass sliding experiments.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/225
Appears in Collections:Industrail Tribology Machine Dynamics [ITMMEC]

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