Rapid Stress Cycling using a Modified Split Hopkinson Pressure Bar Approach Experimental Data

We investigate the effect of rapid stress cycling on the dynamic compressive strength of Westerly Granite using a modified Split Hopkinson Pressure Bar approach. With this approach, generated load paths are composed of two distinct stress cycles separated a brief (hundreds of microseconds) dwell time. Under these loading conditions, the strength and critical strain rate thresholds required to pulverize samples can be reduced by a factor of two when compared with those required in traditional high strain rate tests with the Split Hopkinson Pressure Bar. These results suggest traditional experimental approaches may overestimate material strength when complex load paths are involved. Braunagel_ds01.xlsx and Braunagel_ds02.xlsx contain the voltage time series for the tests described in the above study. Braunagel_ds01.xlsx contains the raw time series of experiments conducted prior to installation of a Shimadzu Hypervision HPV-2 high-speed camera system and Braunagel_ds02.xlsx contains the time series of experiments following camera installation. The first worksheet in each file describes the format of each of the following datasets (contained in subsequent worksheets). Braunagel_Mechanical_Results.xlsx contains the interpreted mechanical data and the assigned post-mortem damage state for each sample. Avi. files contain the high speed camera videos of sample deformation during each test contained in Braunagel_02.xlsx. The number in the lower right corner of each frame is the time since recording began in microseconds. Sample name corresponding to each video is indicated in the file name.