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利用分离式Hopkinson压杆(SHPB)实验装置研究轻质泡沫铝在动态压缩下的温度相关性,重点设计了一种基于SHPB的可视化高温炉,在此基础上通过高速摄影观测泡沫铝试件在高低温且动态压缩下的变形过程。动态加载下的实验结果表明:常温下,胞壁在变形过程中易于观察到屈曲失稳、撕裂、弯曲等现象,且在压缩的过程中碎片飞溅;高温下材料软化较明显,呈现出更多的塑性弯曲现象,但是屈曲失稳与撕裂的现象并不显著,变形过程中并无碎片产生。
The temperature dependency of lightweight aluminum foam under dynamic compression was studied by means of a separate Hopkinson pressure bar (SHPB) experimental apparatus. A SHPB-based visualized high temperature furnace was specially designed. On the basis of the SHPB observation, High and low temperature and dynamic compression of the deformation process. The experimental results under dynamic loading show that at room temperature, the cell wall is prone to buckling, tearing, bending and other phenomena in the deformation process, and the fragments splash during compression; the softening of material is more obvious at high temperature, showing more More plastic bending phenomenon, but buckling instability and tear phenomenon is not significant, no deformation during the production of debris.