PTEE Material Life Modeling based on Compound Poisson Process of Fatigue Crack

摘要

In order to study the life modeling problem of the PTEE material, this paper proposes a Compound Poisson process life modeling method for PTEE material, which performance degradation process is modeled by the PTEE material impact fatigue crack. In the impact work condition, the number of impact times of the material obeys the Poisson process and the damage caused by each impact has a cumulative effect. By using fatigue cumulative damage theory, we can obtain the Compound Poisson process model. Then, the parameters point estimation of Compound Poisson process model are evaluated by using moment estimation method combined with least-square principle method and we utilize fatigue crack data of FTEE material to evaluate the life of PTEE material. A case study on PTEE sealing material for a ship gas turbine generator with reliability degradation testing is used to demonstrate the accuracy and effectiveness of the proposed method. This method solves the problem of material life modeling and evaluation of fatigue crack due to impact characteristics. It can be used as a reference for the reliability evaluation of the similar material products.