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Title: An analysis of stress uniformity in split Hopkinson bar test specimens
Authors: Yang, L.M. 
Shim, V.P.W. 
Keywords: Hopkinson bar
Pulse shape
Stress uniformity
Wave propagation
Issue Date: Feb-2005
Citation: Yang, L.M., Shim, V.P.W. (2005-02). An analysis of stress uniformity in split Hopkinson bar test specimens. International Journal of Impact Engineering 31 (2) : 129-150. ScholarBank@NUS Repository.
Abstract: The assumption of uniform stress in a test specimen is fundamental to the split Hopkinson bar (SHB) test technique. Based on the method of characteristics for one-dimensional waves, the degree of stress uniformity in specimens tested dynamically by the SHB method is examined. The time duration tb (or number of transits n an elastic wave makes from one end to the other of a specimen) required to attain stress equilibrium is established and related to the relative mechanical impedance β of the specimen. The effects of the rising edge in the incident pulse on this time duration are also studied and the results appear to indicate that the shortest time to achieve uniformity of stress in a specimen requires the incident pulse to have a specific profile. The results of this study provide guidelines to assess the validity of experimental data. © 2003 Elsevier Ltd. All rights reserved.
Source Title: International Journal of Impact Engineering
ISSN: 0734743X
DOI: 10.1016/j.ijimpeng.2003.09.002
Appears in Collections:Staff Publications

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