A Fracture-Mechanics Approach to Ceramic Wear
作者:
Yoshitsugu Kimura,
Masayuki Shima,
期刊:
Tribology Transactions
(Taylor Available online 1994)
卷期:
Volume 37,
issue 2
页码: 305-310
ISSN:1040-2004
年代: 1994
DOI:10.1080/10402009408983297
出版商: Taylor & Francis Group
关键词: Wear;Ceramics;Crack;Fracture Mechanics;Fatigue
数据来源: Taylor
摘要:
Wear of ceramics occurs in two major modes, i.e., tribochemical wear and microscopic fracture wear. The present paper discusses the possibility of a fracture-mechanics approach to the latter, which is responsible for detrimental surface damage. A longitudinal contact-point model is employed, and stress intensity at wear cracks is evaluated by three-dimensional finite element analysis. It is revealed that, when a contact point passes over an L-shaped crack which is composed of a vertical and an interconnected horizontal rectangular component or a horizontal rectangular subsurface crack, amplitudes of the Mode II stress-intensity factor having a considerable magnitude are predicted. A brief review of literature on fatigue of ceramics suggests that wear cracks could grow under reasonable loading conditions, and that growth should occur more readily when the absence of the toughening mechanisms with small cracks is taken into account.Presented at the 48th Annual Meeting in Calgary, Alberta, Canada May 17–20, 1993
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