Quantities model of spare parts for nonmetal parts

The optimal numbers of spare parts for nonmetal parts under storage ageing is studied.On the basis of ageing reaction model,ageing law of nonmetal materials is discussed with consideration of environment temperature fluctuating.Monte-Carlo Method is used to determine the distribution of the ageing life.Thereby,Quantities model of spare parts is studied with reliability method according to invalidation replacing,which can be used as references for deciding the quantities of spare parts.