大飞机典型货舱下部结构冲击试验及数值模拟

doi:10.7527/S1000-6893.2021.25890

Abstract

Abstract: The typical sub-cargo structures of three-frame sectional fuselage are adopted to investigate their impact behaviors. The deformation mode and impact response characteristics are compared and analyzed numerically as well as experimentally at various vertical impact velocities. The finite element model of the structure is built up and validated by drop tests with impact velocity of 3.95 m/s and 5.53 m/s. The influence of different impact velocities on the deformation mode and impact response characteristics is further discussed. The results show that the rivets connecting the middle stanchions and fuselage frames remain sound at 3.95 m/s impact velocity. However, as the impact velocity is increased to 5.53 m/s, failure of those rivets occurs, with the final compression displacement being increased by 221.0%, the peak acceleration being reduced by 19.9%, and the peak impact force being reduced by 2.9%. The finite element model can well capture the dynamic behavior of sub-cargo structures observed in the impact test, and can predict the deformation of fuselage frames, middle stanchions and C-channel stanchions, as well as failure of rivets. The deviation of the maximum acceleration peak obtained by simulation and test is 4% and 11.4% at two drop test cases, respectively. The rivets in the connection areas between the middle stanchions and fuselage frames are found failed in finite element analysis around the impact velocity range of 4-4.5 m/s. Consequently, the failure of those rivets results in a rapid increase in the overall compression of sub-cargo structure and a decrease in the energy absorption ratio of middle stanchions, and the energy absorption fuselage frames is therefore dominant. The failure of rivets in the impact area can significantly affect the deformation mode, impact response and energy-absorbing characteristics of sub-cargo structure. This investigation provides insights and understanding for crashworthiness design, analysis as well as certification of transport category airplanes.

Key words: sub-cargo structure, impact test, impact velocity, deformation mode, impact response characteristic

CLC Number:

V214.4

XIE Jiang, MOU Haolei, FENG Zhenyu, CHENG Kun, LIU Yi, LIU Xiaochuan, BAI Chunyu, XI Xulong. Impact characteristics of typical sub-cargo structure of large aircraft: Tests and numerical simulation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(6): 525890-525890.

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Impact characteristics of typical sub-cargo structure of large aircraft: Tests and numerical simulation

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