Theory of Acoustic Emission for Micro-Cracks Appeared Under the Surface Layer Machining by Compressed Abrasive

TL;DR

This paper presents a theoretical model explaining how micro-cracks emit acoustic signals during surface machining with compressed abrasive, focusing on dislocation creep and cavity formation.

Contribution

It introduces a new theoretical framework linking micro-crack acoustic emission to dislocation creep and cavity formation during abrasive machining.

Findings

Energy density of radiated acoustic waves depends on machining parameters.

Dislocation creep in the contact temperature field causes micro-crack emission.

The model explains the physical mechanism behind acoustic signals during micro-cutting.

Abstract

One of the possible mechanisms for acoustic emission of growing micro-cracks under conditions of the material machining by com-pressed abrasive has been theoretically studied. Physical ground of this mechanism is the dislocation creep in the field of instant contact temperature on stage of micro-cutting with appearance of the wedge-shaped cavity. It has been shown that the energy density for radiated acoustic wave at the moment when the cavity is opened essentially depends on parameters of the material abrasive machining.