Title

Study of acoustic emission generation in sliding motion

Document Type

Conference Proceeding

Date of Original Version

12-1-1990

Abstract

Increasing interest in automation requires the development of a variety of sensors for monitoring and feedback purposes. One such area is tactile sensing where there is a need for sensors to characterize the interaction between a probe and the surface. Acoustic Emission (AE) is sensitive to plastic deformations that occur in a material due to dynamic contact. This paper investigates AE signal generation during sliding motion when a probe moves over a surface. The objective is to understand how geometrical properties of the surface affect the characteristics of the resulting signal. An acoustic emission sensor, connected to a probe through a wave-guide, picks up the AE signal as the probe is moved over the surface. A needle, bar, and a rod were used as contact probes. The AE generation mechanism is assumed to be primarily due to the following two sources: impact of the moving probe with surface asperities, and deformation of asperities due to sliding motion. Coated abrasives ranging from 600 to 36 grit size were used as testing surfaces. Experimental results using various feed speeds and the three different probes have shown that the AE event count is the most sensitive to variations in grit sizes while the rms and mean peak amplitude per event of the AE signal are only sensitive for low grit sizes. In addition, the needle and bar are more sensitive than the rod probe. For hard materials, such as coated abrasives, impact of the moving probe with asperities is the more dominant source of AE. This work suggests that, with further study, AE might be able to be used to measure average surface roughness characteristics.

Publication Title

American Society of Mechanical Engineers, Production Engineering Division (Publication) PED

Volume

44

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