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SHPB技术虽然能方便地得出材料的动态应力应变关系,但却不能直观地揭示材料在经受冲击荷载时的变形特征,而这恰恰是泡沫金属力学性能研究的重要方面。为此,本文设计了一套SHPB-高速摄影机系统,借此系统对SHPB实验中的泡沫铝试件进行了实时的变形跟踪拍摄,然后应用图像处理软件对泡沫铝试件的动态变形进行分析并提取了位移信息,得出了泡沫铝试件的变形历时曲线。此外也通过SHPB后处理得到了试件变形信息,最后对比了这两种方法得到的变形信息,发现用这两种方法得出的数据能较好地吻合在一起。这表明,本文设计的实验方法能对泡沫铝试件在SHPB实验过程中的变形进行有效跟踪。
Although SHPB technology can easily derive the dynamic stress-strain relationship of materials, it can not directly reveal the deformation characteristics of materials under impact load, which is an important aspect of the research on mechanical properties of foam metals. Therefore, a set of SHPB-high-speed camera system was designed in this paper. In this system, the deformation of aluminum foam specimens in SHPB experiment was tracked in real time. Then the dynamic deformation of aluminum foam specimens was analyzed by image processing software. The displacement information was extracted and the deformation history curve of aluminum foam specimens was obtained. In addition, the deformation information of the specimen was also obtained by SHPB post-processing. Finally, the deformation information obtained by these two methods was compared and found that the data obtained by these two methods can be well matched. This shows that the experimental method designed in this paper can effectively track the deformation of aluminum foam specimens during the SHPB experiment.