Abstract:Glass-type brittle materials are widely used in aircraft windshield structures, located at the front of the aircraft"s windward side, making them susceptible to bird strikes and subsequent fracturing. Testing fracture parameters of brittle windshield glass is challenging. Typically, elastic-plastic constitutive models and failure strains are used to describe the stress deformation and failure of glass. However, using this traditional SPH (Smoothed Particle Hydrodynamics)-FEM (Finite Element Method) coupling method makes it difficult to simulate the propagation of fine cracks in the windshield glass after a bird strike. This paper, based on the numerical calculation of fracture problems using the DEM (Discrete Element Method), calibrated the microscopic parameters of organic glass fracture with experimental data and established a bird-strike numerical simulation model of flat windshield glass based on the SPH-DEM coupling analysis method. The calculation results indicate the fracturing process of the windshield glass under bird strike impacts. The fracture results of the glass show good consistency with the bird strike test results, demonstrating that the SPH-DEM coupling analysis method can more accurately simulate the fracturing of windshield glass under bird strikes. This provides a new research method and approach for the numerical simulation of bird strikes on aircraft windshield glass.
