Open Access

ARTICLE

Probabilistic Life Calculation Method of NdFeB Based on Brittle Fatigue Damage Model

Lei Li, Guolai Yang^*, Jiahao Li
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
* Corresponding Author: Guolai Yang. Email:

Computer Modeling in Engineering & Sciences 2020, 124(3), 865-884. https://doi.org/10.32604/cmes.2020.010720

Received 23 March 2020; Accepted 03 June 2020; Issue published 21 August 2020

Abstract

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.

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Keywords

NdFeB; ZWT constitutive model; fatigue life; brittle damage; probability density evolution

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Citations