Dynamic Response of Polyurea Coated Steel Plate under Blast Loading
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摘要: 在验证了所用方法有效性的基础上，采用有限元软件LS-DYNA数值模拟了等面密度聚脲涂覆钢板结构及单一钢板在空爆下的动态响应，分析了聚脲涂覆位置对其抗爆性的影响；在此基础上，通过量纲分析的方法讨论了爆心距、炸药质量、涂覆聚脲厚度对钢板变形的影响规律。结果表明，聚脲涂覆在钢板上的位置影响其抗爆性能。其他变量一定的情况下，钢板中心最大位移随爆心距的增加近似呈指数递减趋势；改变炸药质量时，钢板中心最大位移随炸药质量的增加近似呈线性递增趋势；改变涂覆聚脲厚度时，钢板中心最大位移随涂层厚度的增加近似呈线性递减趋势。Abstract: The dynamic response of the equivalent areal density polyurea-coated steel plate and a single steel plate under air blast loads is simulated by using the finite element software LS-DYNA after the validity of this method is demonstrated. The influence of polyurea coating position on its antiknock ability is analyzed; Besides, the method of dimension analysis is employed to study the response of the distance between explosive and steel plate, spherical charge’s quality, and the polyurea layer thickness on the deformation of steel plates based on the prior study. The results show that the position of polyurea coated on steel plate affects its antiknock performance. When other variables are assumed to be constant, the maximum displacement of the center of the steel plate exponentially decreased with the increase of the distance between the distance between explosive and steel plate; Moreover, when the quality of the explosive is changed, the maximum displacement of the steel plate increases linearly with the increase of the explosive mass; Also, when the thickness of the coated polyurea is changed, the maximum displacement of the steel sheet decreases linearly with the increase of the thickness of the coating.
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Key words:
- polyurea coated steel plate /
- dimensional analysis /
- displacement /
- blast load /
- antiknock ability
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图 5 不同工况中钢板的位移云图
Figure 5. Displacement cloud chart of steel plate in different working conditions
图 6 钢板最大变形处的位移时程曲线
Figure 6. Displacement-time curves at maximum deflections of steel plates
图 7 钢板最大变形处的塑性应变时程曲线
Figure 7. Plastic strain-time curves at maximum deflections of steel plates
图 8 爆心距对聚脲涂覆钢板最大位移的影响
Figure 8. Relationship between the detonation distance and the maximum displacement of polyurea coated steel plate
图 9 炸药质量对聚脲涂覆钢板最大位移的影响
Figure 9. Relationship between the mass of explosive and the maximum displacement of polyurea coated steel plate
图 10 聚脲层厚度对聚脲涂覆钢板最大位移的影响
Figure 10. Relationship between the thickness of polyurea layer and the maximum displacement of polyurea coated steel plate
Density/(kg·m–3) Tensile strength/MPa Elongation at break/% Tear strength/(kN·m–1) Shore hardness (HA) 1020 24 400 85 85–95 
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表 2 结构设计方案
Table 2. Structural design schemes
Condition
numberStructural
diagramSteel plate
thickness/mmPolyurea
thickness/mmTNT
dose/kgDetonation
distance/mmA1
Contrast condition3 0 1 200 A2
Single steel plate3.52 0 1 200 A3
Front coating3 4 1 200 A4
Back coating3 4 1 200 A5
Double sided coating3 2+2 1 200 Note: Q235A steel plate;
Polyurea.
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