基于数字图像相关方法对冲击载荷下泡沫铝全场变形过程的测试

Test of Aluminum Foam Deforming Process under Impact Load Based on Digital Image Correlation Method

应用分离式霍普金森压杆(以下简称SHPB)和高速摄影装置研究了冲击载荷下泡沫铝试件全场变形的测量方法。使用SHPB对泡沫铝试件进行冲击压缩实验,同时用高速摄影装置对实验过程进行全程跟踪拍摄。将得到的高速摄影图像采用数字图像相关方法进行分析,由此可得到冲击压缩过程中泡沫铝试件全场应变的分布和变化规律。此研究揭示了冲击载荷下泡沫铝试件局部化变形的发展过程,为研究泡沫铝在不同冲击载荷下不同变形模式的内在机制提供了新的可靠的方法。

Full field deformation measurement method of aluminum foam under impact loading was studied by using split Hopkinson Pressure Bar （hereinafter referred to as SHPB） and high speed camera. Impact pressure experiment of aluminum foam specimen was carried out based on SHPB, at the same time the whole experimental process was tracked by high speed camera. The resulting high speed photographic images were analyzed by digital speckle method. Thus, the strain distribution and variation in deformation field of aluminum foam specimen during impact pressure loading process were obtained. Results reveal the development process of internal localized deformation of aluminum foam specimen under impact loading, which offers a new and reliable method for studying the internal mechanism of different deformation mode of aluminum foam under impact loading.