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.

研究了一体成型泡沫铝夹层（IFAFS）在准静态和动态压缩下的应变率敏感性和变形机制。使用高速摄像机进行分裂霍普金森压力杆实验，以分析 IFAFS 的应变率依赖性和实际变形机制。基于 3D 有限元 (FE) 的 X 射线显微断层扫描技术 (Micro-CT) 用于研究 IFAFS 样品的应力和塑性应变轮廓，并预测动态和准静态载荷下的应力分布和变形历史。通过有限元模拟定量分析典型单元结构的微惯性效应。结果表明，IFAFS对应变率敏感，动态加载下的变形模式与准静态加载下观察到的不同。随着应变速率的增加，面板与泡沫芯层良好的冶金结合有助于提高IFAFS的弹性模量和峰值应力。此外，有限元模型证实，在动态加载过程中，IFAFS 的微惯性效应可以忽略不计。