【摘要】 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。更多还原

【Abstract】 Dynamic stress-strain relation of material can be easily obtained by using SHPB system,but the dynamic deformation characteristics of material,which are just important aspect of metal foam’s mechanical properties,can not be directly revealed by SHPB method.Therefore,a SHPB-high-speed camera system was designed to track the dynamic deformation of aluminum foam specimen in SHPB experiment,and the deformation information contained in images was derived and analyzed by using image processing software.Furthermore,the displacement-time curve was obtained,and the deformation was also obtained from the post-process of SHPB.Then,above-mentioned two kinds of deformation were compared.Results show that the data obtained from image processing software agree with that of SHPB post-processing,which indicates that high-speed camera system designed to track the deformation process in aluminum foam SHPB experiment of is feasible.更多还原