Damage effects of clamped square plates by near-field underwater explosion with complex boundary conditions

DENG Shuo; LAI Zhichao; QIN Jian; MENG Xiangyao; CHI Hui; HUANG Ruiyuan

doi:10.11883/bzycj-2023-0164

Volume 43 Issue 11

Nov. 2023

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DENG Shuo, LAI Zhichao, QIN Jian, MENG Xiangyao, CHI Hui, HUANG Ruiyuan. Damage effects of clamped square plates by near-field underwater explosion with complex boundary conditions[J]. Explosion And Shock Waves, 2023, 43(11): 112204. doi: 10.11883/bzycj-2023-0164

Citation:

DENG Shuo, LAI Zhichao, QIN Jian, MENG Xiangyao, CHI Hui, HUANG Ruiyuan. Damage effects of clamped square plates by near-field underwater explosion with complex boundary conditions[J]. Explosion And Shock Waves, 2023, 43(11): 112204. doi: 10.11883/bzycj-2023-0164

Citation:

DENG Shuo, LAI Zhichao, QIN Jian, MENG Xiangyao, CHI Hui, HUANG Ruiyuan. Damage effects of clamped square plates by near-field underwater explosion with complex boundary conditions[J]. Explosion And Shock Waves, 2023, 43(11): 112204. doi: 10.11883/bzycj-2023-0164

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Damage effects of clamped square plates by near-field underwater explosion with complex boundary conditions

doi: 10.11883/bzycj-2023-0164

1.
College of Civil Engineering, Fuzhou University, Fuzhou 350116, Fujian, China
2.
Naval Research Academy, Beijing 100161, China
3.
Institute of Chemical Defense, Beijing 102205, China

Received Date: 2023-05-05
Rev Recd Date: 2023-09-12

Available Online: 2023-09-13

Publish Date: 2023-11-17

Abstract

Abstract

Near-field underwater explosion produces complex loading patterns, and complex boundary conditions make the damage patterns of structures under near-field underwater explosion more difficult to predict. Thus, the investigation on the evolution of underwater explosion bubbles and the damage effects on the clamped square plates with the coupling of multi-boundary (free surface, elastoplastic plates and sediment boundary) was conducted using the coupled Eulerian-Lagrangian (CEL) method. Firstly, to verify the accuracy of the finite element method, underwater explosion tests were performed 10 cm under the bottom of the clamped square plates in different dimensions (the side lengths of the plates were 0.46, 0.92 and 1.61 times the maximum bubble diameter) using 2.5 g TNT. Then, the damage mechanism of the clamped square plates was analyzed by combining the test and finite element results. Finally, a series of numerical simulations reveal that with increasing plate dimension and stand-off distance, bubbles show three different evolution modes: collapse, downward jet, and upward jet. With increasing plate dimension, the effects of stand-off distance on the final deformation of the plate center decreases. The sediment boundary can alleviate the bubble shrinkage, make the bubble firstly collapse from the middle to form jets in the opposite direction, and reduce the displacement and strain of the clamped square plates. The sediment boundary has no effects when the bubbles collapse in advance.
- near-field underwater explosion,
- clamped square plate,
- coupled Eulerian-Lagrangian (CEL) method,
- complex boundary,
- dynamic damage

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References(35)

References

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