On impact response of a prestressed metal beam

ZHENG Jian; LU Fangyun

doi:10.11883/bzycj-2020-0328

Volume 41 Issue 3

Mar. 2021

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ZHENG Jian, LU Fangyun. On impact response of a prestressed metal beam[J]. Explosion And Shock Waves, 2021, 41(3): 031401. doi: 10.11883/bzycj-2020-0328

Citation:

ZHENG Jian, LU Fangyun. On impact response of a prestressed metal beam[J]. Explosion And Shock Waves, 2021, 41(3): 031401. doi: 10.11883/bzycj-2020-0328

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On impact response of a prestressed metal beam

doi: 10.11883/bzycj-2020-0328

ZHENG Jian,
LU Fangyun^,

College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, Hunan, China

Received Date: 2020-09-21
Rev Recd Date: 2020-09-23

Available Online: 2021-03-05

Publish Date: 2021-03-10

Abstract

Abstract

During the service time of engineering structure, most structural members are under prestress conditions. In order to clarify the effect mechanism of prestress on the response of metal beams subjected to impulsive loading, the plastic deformations of metal beams under different axial prestress conditions and different impact strength were studied. The prestress conditions were controlled by a self-designed prestress loading device while the impact loadings were realized by the drop-hammer method. Numerical models were also established to simulate the related test conditions. The numerical results are in good agreement with the test results. By comparing the residual deflections of the beams, it is found that the middle-point residual deflection under compressive prestress is larger than that without prestress, and there is no regular rule between the deflection and prestress under the condition of tensile prestress. From the perspective of energy, it is found that the plastic deformation energy of the beam comes from the external dynamic energy and the initial internal energy. The higher the external kinetic energy ratio is, the higher the energy absorption rate of the beam will be. At a lower external kinetic energy ratio, the energy absorption rate of the beam is relatively higher under compressive prestress, and relatively lower under tensile prestress. While at a higher external kinetic energy ratio, the prestress has little effect on the energy absorption rate. Under compressive prestress, the limit moment increases while the length decreases, and the increased plastic deformation energy is distributed in the beam with reduced length, which will inevitably lead to larger residual deflection. Under the tensile prestress, the limit moment decreases while the length increases, and the increased plastic deformation energy is distributed in the beam with the increased length, for which the residual deflection has no obvious rule. This explains to a certain extent the effect mechanism of prestress on the deformation of the metal beam subjected to impact loading.
- metal beam,
- prestress,
- impact response,
- residual deflection

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References(10)

References

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