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Multi-scale analysis and modeling of rock crushers wear morphology

Abstract : Rock crushers are production systems used to produce fine raw material from coarse collected material (agricultural or mining). Crushing is a complex tribological process which causes significant wear on work pieces due to strong local and global stresses. The working life of the crusher parts is therefore questioned because of this high wear. The vertical roller mill is especially studied here, whose rollers are manufactured with a metal matrix and ceramic inserts. Methods of characterization are therefore developed to quantify this wear which appears to be multi-scale (system, macroscopic, mesoscopic and microscopic). These methods are mainly adapted to in-situ measurements due to a real demand to directly control rollers on the production line in order to avoid any prolonged time stop of the system. A method for characterizing damage of surfaces exposed to wear is developed. This method, which consists in illuminating a surface from different lighting angles, is proving to be a real alternative to the topographical method for characterizing wear in mesoscopic and microscopic scales. A portable apparatus using this method is developed to analyze in detail wear of crusher parts directly in an industrial environment. Morphological indicators are calculated for each scale from collected data. A database is implemented to organize data of different type and scale, and to correlate the different scales.
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Submitted on : Thursday, December 2, 2021 - 5:04:55 PM
Last modification on : Monday, January 31, 2022 - 2:34:17 PM


  • HAL Id : tel-03463882, version 1


Julie Lemesle. Multi-scale analysis and modeling of rock crushers wear morphology. Mechanics of materials [physics.class-ph]. Université Polytechnique Hauts-de-France; Institut national des sciences appliquées Hauts-de-France, 2021. English. ⟨NNT : 2021UPHF0039⟩. ⟨tel-03463882⟩



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