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首页> 外文期刊>International journal of impact engineering >Experimental and numerical investigation on the deformation and energy dissipation of AA6061-T6 circular extrusion subjected to blast loading
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Experimental and numerical investigation on the deformation and energy dissipation of AA6061-T6 circular extrusion subjected to blast loading

机译：爆炸载荷下AA6061-T6圆形挤压变形和能量耗散的实验与数值研究

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摘要

The study detailed in this manuscript focuses on the numerical and experimental testing of circular M6061-T6 aluminum alloy extrusions subjected to cutting deformation modes under blast loading conditions, as energy dissipation devices. The experimental investigation was completed utilizing a specially designed cutter with the presence of a deflector mounted on a ballistic pendulum. Plastic explosives (PE4) where charge masses varied from 20 g to 40 g were used to initiate blast loads. Experimental results revealed that the cutting deformation mode was repeatable and controllable having a stable and clean curling cut. Numerical simulations of the detonation as well as the axial cutting deformation process employing an Eulerian finite element formulation were performed. Numerical detonation models were in good agreement with experimental results having an average standard error less than 3% for impulse predictions. Good predictive capabilities of the numerical model for the axial cutting behaviour and large scale deformation response were observed. An almost constant force during cutting was observed, which eliminated the initial high peak crush force associated with a dynamic plastic collapse deformation mode. The average mean cutting force, measured at the load cell for both experimental and numerical testing methods as a result of cutting deformation was observed to be 33.5 kN for the specific specimen geometry and material. Finally, a force analysis was conducted using theoretical and numerical models to study the steady-state cutting condition. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本手稿中的详细研究集中于圆形M6061-T6铝合金挤压件在爆炸载荷条件下作为能量消散装置的切削变形模式下的数值和实验测试。实验研究是通过使用特殊设计的刀具完成的，刀具带有安装在弹道摆上的偏转器。装药质量从20克到40克不等的塑料炸药（PE4）用于引发爆炸载荷。实验结果表明，切割变形模式可重复且可控，具有稳定，干净的卷边。进行了爆轰的数值模拟以及采用欧拉有限元公式的轴向切削变形过程。数值爆轰模型与实验结果吻合良好，实验结果的平均标准误差小于3％。数值模型对轴向切削性能和大规模变形响应具有良好的预测能力。在切割过程中观察到几乎恒定的力，这消除了与动态塑性塌陷变形模式相关的初始高峰值挤压力。对于特定的样品几何形状和材料，在实验和数值测试方法中，由于切削变形而在测力计上测得的平均切削力为33.5 kN。最后，使用理论和数值模型进行了力分析，以研究稳态切削条件。 （C）2017 Elsevier Ltd.保留所有权利。

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