Strain rate sensitivity and deformation mechanism of integral-forming aluminum foam sandwich(IFAFS)under quasi-static and dynamic compression were investigated.Split Hopkinson pressure bar experiments with high-speed ...Strain rate sensitivity and deformation mechanism of integral-forming aluminum foam sandwich(IFAFS)under quasi-static and dynamic compression were investigated.Split Hopkinson pressure bar experiments with high-speed video cameras were conducted to analyze strain rate dependency and actual deformation mechanism of IFAFS.X-ray microtomography technique(Micro-CT)based on 3D finite element(FE)was used to study stress and plastic strain contours of IFAFS sample and to predict stress distribution and deformation history under both dynamic and quasi-static loadings.Micro-inertia effect of typical cell structures was quantitatively analyzed by FE simulation.The results showed that IFAFS is sensitive to strain rate where the deformation mode under dynamic loading is different from that observed under quasi-static loading.With strain rate increasing,good metallurgical bonding of face sheet and foam core layer contributed to improving the elastic modulus and peak stress of IFAFS.Furthermore,finite element model confirmed that micro-inertia effect of IFAFS can be ignored during dynamic loading.展开更多
基金This work was supported by Key R&D Program of Hebei Province(19251013D)Special Fund for Military-civilian Integration Development of Hebei Province,Provincial School Science and Technology Cooperation Development Fund Project of Hebei Province and National Students Innovation and Entrepreneurship Training Program(No.X202110080054).The authors gratefully acknowledge the 3D visualization analysis provided by Tianjin Sanying Precision Instrument Co.,Ltd.
文摘Strain rate sensitivity and deformation mechanism of integral-forming aluminum foam sandwich(IFAFS)under quasi-static and dynamic compression were investigated.Split Hopkinson pressure bar experiments with high-speed video cameras were conducted to analyze strain rate dependency and actual deformation mechanism of IFAFS.X-ray microtomography technique(Micro-CT)based on 3D finite element(FE)was used to study stress and plastic strain contours of IFAFS sample and to predict stress distribution and deformation history under both dynamic and quasi-static loadings.Micro-inertia effect of typical cell structures was quantitatively analyzed by FE simulation.The results showed that IFAFS is sensitive to strain rate where the deformation mode under dynamic loading is different from that observed under quasi-static loading.With strain rate increasing,good metallurgical bonding of face sheet and foam core layer contributed to improving the elastic modulus and peak stress of IFAFS.Furthermore,finite element model confirmed that micro-inertia effect of IFAFS can be ignored during dynamic loading.
