Numerical simulation of influence of constrained layer on expanding deformation of metal cylindrical shell
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摘要: 对金属铝和硬质聚氨酯泡沫组合的约束层对45钢柱壳膨胀断裂性能的影响进行了数值模拟，得到三种约束条件下45钢柱壳在膨胀过程中表面的速度和位移历史剖面，对比分析了在约束层作用下45钢柱壳膨胀变形动态行为。利用高速分幅相机及中能X光机获得了多个时刻45钢柱壳的动态图像和柱壳膨胀后的工程应变，实验结果与数值模拟结果吻合。结果可对爆轰加载下约束层对45钢柱壳膨胀变形的物理规律进行定量认识。Abstract: In this work we investigated the influence of the constrained layer, composed of metal aluminum and polyurethane foam, on the expanding deformation of a metal cylindrical shell using numerical simulation, obtained the velocity and displacement profiles for 45 steel and aluminum affected by shock wave, and compared its simulated dynamic behaviors under the influence with those from the corresponding experiments performed using a high-speed framing camera and medium-energy X-ray photography and found them in good agreement. The findings obtained here provide a quantitative understanding of the constrained layer in terms of its influence on the expanding deformation of the metal cylindrical shell subjected to the high explosive loading.
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Key words:
- cylindrical shell /
- constrained layer /
- expanding deformation /
- X-ray
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图 4 三种状态下45钢柱壳的速度及位移历史剖面
Figure 4. Velocity and displacement profiles of 45 steel cylindrical shell
图 5 C1及C2状态下铝柱壳的速度及位移历史剖面
Figure 5. Velocity and displacement profiles of LY12 Al cylindrical shell
图 6 不同约束条件下实验与数值模拟比较(t=19.0 μs)
Figure 6. Comparison of deformation between experiments and simulations at t=19.0 μs
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