Damage mechanism of typical stiffened aircraft structures under explosive loading

CHENG Shuai; LIU Wenxiang; TONG Nianxue; YIN Wenjun; SHI Yingju; ZHANG Dezhi

doi:10.11883/bzycj-2020-0077

Volume 41 Issue 1

Jan. 2021

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CHENG Shuai, LIU Wenxiang, TONG Nianxue, YIN Wenjun, SHI Yingju, ZHANG Dezhi. Damage mechanism of typical stiffened aircraft structures under explosive loading[J]. Explosion And Shock Waves, 2021, 41(1): 013302. doi: 10.11883/bzycj-2020-0077

Citation:

CHENG Shuai, LIU Wenxiang, TONG Nianxue, YIN Wenjun, SHI Yingju, ZHANG Dezhi. Damage mechanism of typical stiffened aircraft structures under explosive loading[J]. Explosion And Shock Waves, 2021, 41(1): 013302. doi: 10.11883/bzycj-2020-0077

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Damage mechanism of typical stiffened aircraft structures under explosive loading

doi: 10.11883/bzycj-2020-0077

Laboratory of Intense Dynamic Loading and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024, Shaanxi, China

Received Date: 2020-03-23
Rev Recd Date: 2020-09-17
Publish Date: 2021-01-05

Abstract

Abstract

Explosion experiments were performed to explore the response law of typical stiffened skin structures of aircrafts under explosive loading. And in the experiments, the following data on the structural responses were obtained as the reflected overpressure history at the surface of the typical aircraft structure, the strain and displacement of the stiffened structure. By combining the experimental data, a finite element model at a high-confidence level was proposed to analyze the deformation distribution and plastical damage characteristics of the structure investigated in this paper. Results show that for the stiffened structure investigated in this paper, the plastical deformation can start commonly at the midpoints of stiffeners, stiffener-to-stiffener and stiffener-to-outer frame joints in addition. It is mainly due to biaxial tensile deformation and stress concentration in stiffeners. Furthermore, the effective impulse and the peak threshold of reflected overpressure which can cause plastic deformation of reinforced structures with the increase of positive pressure action time were summarized. The research results are of great significance in the aerodynamic design of an aircraft.
- aircraft,
- stiffened structure,
- plastic deformation,
- contact surface explosion,
- damage,
- explosive loading

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References(17)

References

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