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Generalization of split Hopkinson bar technique to use viscoelastic bars

Authors
Journal
International Journal of Impact Engineering
0734-743X
Publisher
Elsevier
Publication Date
Volume
15
Issue
5
Identifiers
DOI: 10.1016/0734-743x(94)90166-i

Abstract

Summary To study the high strain-rate mechanical behaviour of materials having lower wave impedance, it is suggested to generalize the split Hopkinson bar technique by using polymeric bars. The key of such a generalization lies in the method for determining the stresses and particle velocities at two interfaces of specimen from the strain pulse signals measured at the strain gauges located in a distance from the interface, taking account of the dispersion and dissipation of viscoelastic wave propagating in polymer bars. Based on the Zhu-Wang-Tang viscoelastic constitutive equation and the characteristics theory of wave propagation, such a method is developed and discussed in detail. The experimental measurements confirm that in order to avoid both the quantitative and qualitative errors, neither of which are negligible, the viscoelastic wave effects must be and can satisfactorily be taken into consideration by the viscoelastic wave analytical method suggested in the present paper.

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