Abstract: Under the conditions of continuous cutting, the abrasion wear is the principal failure mechanism for the alumina-based ceramic cutting tools. The tool life by wear is subject to the logarithmic normal distribution. The classical and fuzzy reliability can be calculated by Monte Carlo simulation in combination with the cutting experiments. It is proved that the reliability is primarily affected by the fracture toughness so that it can estimate the tool reliability by this parameter. The fuzzy reliability is more reasonable than classical reliability.

Key words: Ceramic cutting tools, Monte Carlo, Reliability Fuzzy, Wear