关键词: 低周疲劳寿命, 随机有限元法, 可靠性, 失效临界方程

Abstract:

A new method fo r reliability analysis of discs'LCF life is p resented. In the method,a failure crit ical equat ion deduced direct ly from the M ansonCoffin LCF life fo rmulae and itsderivat ivesw ith respect to the random variables are given. By use of p robabilist ic finite elementmethod, a new fo rmulat ion fo r reliability analysis of discs'LCF life is set up. F inally, severalnumerical examp les are given. The comparison betw een the results obtained from the p resentmethod and tho se obtained by use of the method deduced direct ly from L andgraf's LCF life fo rmula demonst rates that the p resent method is mo re reasonable in the p ract ical st rain range ofaeroengine discs and safer reliability results of discs'LCF life can be obtained from it.

Key words: LCF life, probabilistic FEM, reliability, failure critical equation