Study on the Polynomial Coefficients of the Equation of State Based on One-Dimensional Bird Impact Theory
Bird strikes pose a significant threat to the safety of composite aircraft structures.The coefficients of the bird material's equation of state significantly influence the simulation results,including impact pressure,in bird strike simulations.This paper introduces a method to determine the coefficients of the equation of state:the relationship between peak pressure(PH)and the density ratio(μz)is derived from a simplified equation based on one-dimensional bird impact theory,and the polynomial coefficients C1,C2,and C3 are obtained by fit-ting a cubic curve to the(μz,PH)data.The coefficients of the equation of state were validated using the strain response and damage results from finite element simulations of bird strike on composite plates.The simulation results using the coefficients obtained in this paper are consistent with experimental results based on a set of veri-fied bird material parameters.This method can serve as a reference for determining coefficients for bird materi-als of different densities.This method helps reduce the costs associated with bird material testing in bird strike simulations and aircraft structure design.
万方数据
维普
