Ll. Wang et al., GENERALIZATION OF SPLIT HOPKINSON BAR TECHNIQUE TO USE VISCOELASTIC BARS, International journal of impact engineering, 15(5), 1994, pp. 669-686
To study the high strain-rate mechanical behaviour of materials having
lower wave impedance, it is suggested to generalize the split Hopkins
on bar technique by using polymeric bars. The key of such a generaliza
tion lies in the method for determining the stresses and particle velo
cities at two interfaces of specimen from the strain pulse signals mea
sured at the strain gauges located in a distance from the interface, t
aking account of the dispersion and dissipation of viscoelastic wave p
ropagating in polymer bars. Based on the Zhu-Wang-Tang viscoelastic co
nstitutive equation and the characteristics theory of wave propagation
, such a method is developed and discussed in detail. The expermental
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 consideratio
n by the viscoelastic wave analytical method suggested in the present
paper.