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Strain-rate dependency and impact dynamics of closed-cell aluminium foams
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2021-05-04 , DOI: 10.1016/j.msea.2021.141379
M.A. Kader , P.J. Hazell , M.A. Islam , S. Ahmed , M.M. Hossain , J.P. Escobedo , M. Saadatfar

Strain rate sensitivity and deformation mechanisms of closed-cell aluminium foams under low-velocity impact loadings are investigated in this study. Instrumented drop-weight impact experiments and Finite Element (FE) modelling were conducted to explore the deformation rate dependency of aluminium foams (manufactured by CYMATTM corporation). An X-ray micro-Computed Tomography (XCT) reconstructed foam geometry was used in the FE modelling approach to explore actual deformation mechanisms and strain rate sensitivity of foams. The deformation and pore collapse mechanisms were explored through investigating the stress and plastic strain contours. Our results show that the FE modelling with rate-dependent material properties agreed with the dynamic experimental results. The foam showed significant rate sensitivity within the examined range of strain rates. Our modelling and experimental results collectively indicate that the rate sensitivity of the base material is the primarily responsible for enhancing strength during impacts. Furthermore, the FE modelling with rate-independent material properties and unique foam topology confirms the negligible inertia effect at low velocity impacts.



中文翻译:

闭孔泡沫铝的应变率依赖性和冲击动力学

本文研究了低速冲击载荷下闭孔泡沫铝的应变速率敏感性和变形机理。进行了仪器化的落锤冲击试验和有限元(FE)建模,以探索泡沫铝的变形速率依赖性(由CYMAT TM制造公司)。有限元建模方法中使用了X射线微计算机断层扫描(XCT)重建的泡沫几何形状,以探索泡沫的实际变形机理和应变速率敏感性。通过研究应力和塑性应变轮廓,探索了变形和孔隙塌陷的机理。我们的结果表明,具有速率相关材料特性的有限元建模与动态实验结果吻合。泡沫在所检查的应变速率范围内显示出显着的速率敏感性。我们的建模和实验结果共同表明,基材的速率敏感性是冲击过程中增强强度的主要原因。此外,

更新日期:2021-05-18
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