摘要
This paper proposes a probabilistic life calculation method of NdFeB based on brittle fatigue damage model.Firstly,Zhu-Wang-Tang(ZWT)constitutive model considering strain rate is established,and based on this,a numerical co-simulation model for NdFeB life calculation is constructed.The life distribution diagram of NdFeB under different stress levels is obtained after simulation.Secondly,a new model of brittle fatigue damage based on brittle damage mechanism is proposed.Then the parameters in the model are identified according to the life distribution diagram of NdFeB and the parameter distribution of the damage evolution model when applied to NdFeB is obtained.Finally,the probability density evolution equation of NdFeB life calculation is established and solved using the probability density evolution method.Probability density function(PDF)of NdFeB life under different stress levels is obtained and provides theoretical basis for the reliability of NdFeB in engineering applications.
基金
The work was primarily supported by the National Natural Science Foundation of China(Grant Number 301070603).
