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中文摘要：
讨论了连续切削条件下以磨粒磨损为磨损失效模式的Al2O3基陶瓷刀具的磨损寿命可靠性问题。根据应力-强度干涉理论,建立了Al2O3基复相陶瓷刀具磨损寿命的极限状态方程。在基本随机参数概率分布已知的前提下,利用等效正态分布法,将服从Weibull分布的断裂韧度KIC和硬度H进行等效正态化,进而将鞍点逼近理论应用到陶瓷刀具磨损寿命的可靠性分析中,得到了极限状态方程的概率密度函数曲线和累积分布函数曲线,并且将鞍点逼近法得到的分析结果与Monte-Carlo数值分析结果进行了对比,结果表明,所述方法精度颇高、计算速率较高。
英文摘要：
Under continuous cutting conditions,the reliability of alumina-based ceramic cutting tool＇s wear life with abrasion wear was discussed extensively.An ultimate state equation of alumina-based ceramic cutting tool＇s wear life was proposed according to stress-strength interference theory.Based on the premise that the probability distribution of random parameters has been known,the fracture toughness K_IC and the hardness H which obeys Weibull distribution were transformed into normal distribution by means of the equivalent normal distribution method,then the reliability of alumina-based ceramic cutting tool＇s wear life was analyzed by saddlepoint approximation method.The probability density function and cumulative distribution function of the ultimate state equation were accurately and quickly obtained by way of saddlepoint approximation,as a result,the saddlepoint approximation method was proved accurate with high computing speed in comparison with the Monte-Carlo method.Therefore,the application of the saddlepoint approximation method developes the reliability analysis theory of alumina-based ceramic cutting tool＇s wear life.
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