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| Experimental and numerical study on the incident pulse similarity law and pulse shaping technique in SHPB test |
| WANG Jiangbo, LI Wenfeng, REN Wenke,WANG Xiaodong,LI Jiliang, GAO Guangfa |
| College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094，China |
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Abstract Based on the dimensional analysis theory, whether the incident pulse of split Hopkinson pressure bar(SHPB) test with pulse shaper satisfied the geometric similarity law is studied. The results are verified by experiments and numerical simulation. The effects of pulse shaper and impact bar parameters on the two important inflection points of incident pulse are analyzed by the SHPB device with a diameter of 14.5mm. Moreover, the dimensionless expressions of incident pulse at T1 and T2 inflection points are obtained. The results show when the pulse shaper and striker bar diameter are enlarged or shrunk with the impact bar velocity remains constant, the SHPB device pulse-shaped conforms to the geometric similarity law. The inflexion point T1 is mainly related to the pulse shaper diameter and its thickness and the striker bar velocity, while the inflection point T2 is mainly affected by the pulse shaper thickness and the striker bar velocity. The striker bar length only effects the incident pulse duration, but has no effect on the rise edge stage of the incident pulse.
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Received: 16 October 2020
Published: 28 March 2022
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