Influence of blast loading parameters on elastic dynamic response of an infinite-length cylindrical shell

ZHANG Pengzhou; DONG Qi; YANG Sha

doi:10.11883/bzycj-2020-0269

Volume 41 Issue 6

Jun. 2021

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ZHANG Pengzhou, DONG Qi, YANG Sha. Influence of blast loading parameters on elastic dynamic response of an infinite-length cylindrical shell[J]. Explosion And Shock Waves, 2021, 41(6): 063101. doi: 10.11883/bzycj-2020-0269

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Influence of blast loading parameters on elastic dynamic response of an infinite-length cylindrical shell

doi: 10.11883/bzycj-2020-0269

Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2020-08-07
Rev Recd Date: 2021-01-21

Available Online: 2021-06-10

Publish Date: 2021-06-05

Abstract

Abstract

The elastic dynamic response of an infinite-length cylindrical shell (equivalent plane strain ring) was analyzed by using the single degree of freedom (SDOF) model under blast loading with triangular pulse load and quasi-static pressure load. The analytical solutions of radial displacement response and amplitude of elastic response under quasi-hydrostatic load were obtained. Based on the analytical solution, the influence of load pressure and the moment of the load boundary point (i.e. the time instant at which the triangular pulse load ends and the quasi-static pressure load begins) on the maximum radial displacement and the amplitude of elastic response in quasi-static pressure stage was analyzed by the control variable method, and the influence of explosion load on the structural response was further studied. The influence of blast loading on the elastic dynamic response of the infinite-length cylindrical shell was studied through the ratio of quasi-static pressure amplitude to triangular pulse peak value and the moment of the load boundary point, combined with the breathing vibration frequency of the structure. It is found that there is a critical time, when the moment of the load boundary point is earlier than the critical moment, the maximum value of radial displacement appears in the quasi-static pressure stage; when the moment of the load boundary point is later than the critical moment, the maximum value of radial displacement can be conveniently determined according to the obtained partition diagram of load stage. Based on the analysis of the above analytical solution, the monotonic zonal diagram of the amplitude variation in quasi-hydrostatic stage caused by the triangular pulse load peak value and quasi-hydrostatic load peak value has obtained, which is convenient to distinguish the increasing and decreasing trend of the amplitude in quasi-hydrostatic stage caused by the load pressure variation. By obtaining the influence of explosion pressure load on the structural response, the current study may provide some guidance for the design of explosion vessels and the basic research of structural protection.
- explosion vessel,
- blast loading,
- infinite-length cylindrical shell,
- dynamic response,
- zoning diagram

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References

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