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首页> 外文期刊>International Journal of Metalcasting: Leading the Transfer of Research and Technology for the Global Metalcasting Industry >Research on Dynamic Accumulation Effect and Constitutive Model of Aluminum Foams Under Dynamic Impact
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Research on Dynamic Accumulation Effect and Constitutive Model of Aluminum Foams Under Dynamic Impact

机译：动态撞击下铝泡沫动态累积效应及本构模型研究

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摘要

Aluminum foams were prepared by melt foaming process. The mechanical properties of aluminum foams under repeated impacts were studied. The porosity and pore size of the prepared aluminum foam were measured. The effects of damage accumulation on the failure morphology of aluminum foam, the transmission rate, stress-strain curve, energy absorption capacity, and the ideal energy absorption efficiency were analyzed. The influence of the number of impacts on the dynamic mechanical properties of the material under the condition of equivalent damage accumulation was studied. Based on the Sherwood-Frost equation, the damage cumulative constitutive model of the aluminum foams under repeated impacts was established. The influence of the difference between the damage cumulative energy corresponding to the reference curve of the shape function and the damage cumulative energy in multiple impacts tests on the prediction accuracy of the constitutive model was analyzed. The results show that with the increase in the number of impacts, the degree of damage to aluminum foam increases, transmission rate increases, the elastic limit stress and the corresponding strain are enhanced, and the damage accumulation effect on aluminum foam under repeated impacts is helpful to improve the ideal energy absorption efficiency. It is verified that the constitutive model can reflect the mechanical properties of aluminum foam under repeated impacts.
机译：通过熔体发泡过程制备铝泡沫。研究了反复撞击下铝泡沫的机械性能。测量制备的铝泡沫的孔隙率和孔径。分析了损伤积累对铝泡沫破坏形态的影响，分析了透射率，应力曲线，能量吸收能力和理想的能量吸收效率。研究了对等同损伤积累条件下对材料动态力学性能的影响的影响。基于夏伍德 - 霜冻方程，建立了反复撞击下铝泡沫的损伤累积本构体模型。分析了对应于形状函数的参考曲线的损伤累积能量的影响及多次冲击试验中的损伤累积能量对本构模型的预测精度。结果表明，随着撞击次数的增加，铝泡沫的损坏程度增加，传动速率增加，弹性极限应力和相应的应变增强，并且在重复影响下对铝泡沫的损坏积累效应是有帮助的提高理想的能量吸收效率。验证了本构模型可以在重复撞击下反映铝泡沫的机械性能。

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