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| Model of bird impact on LY12CZ aluminum alloy plate based on SPH |
| 1. College of Information, Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai 200234, China; 2. Shanghai Aircraft Design and Research Institute, Commercial Aircraft Corporation of China Ltd., Shanghai 201210, China |
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Abstract To obtain the accurate analysis model of bird impact for aircraft structures, the numerical model of bird impact on LY12CZ aluminum alloy flat plates was established based on the explicit finite element code of PAMCRASH. JohnsonCook equation was adopted to describe the constitutive model of LY12CZ aluminum alloy. The stressstrain curves at 4 different strain rates of LY12CZ were measured by dynamic tensile tests using electronic universal testing machine and split Hopkinson tensile bar (SHTB), and four constants in JohnsonCook equation were fitted. Bird was modeled by smooth particle hydrodynamics (SPH) method, and Monaghan EOS equation was introduced to simulate the bird material. Two corresponding bird impact experiments were implemented, and the strains of testing points were obtained. The calculation results were compared with the bird impact experimental results. The results show that the good agreement between numerical calculation and experimental results is obtained, which illuminates the bird constitutive model, the aluminum alloy constitutive model and the calculation method for high speed are reasonable and reliable.
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2016, Vol. 37 
