Qingming Li

TL;DR: In this article, the authors examined the application of split Hopkinson pressure bar (SHPB) to determine the dynamic strength of concrete-like materials whose compressive strength is hydrostatic-stress-dependent and showed that the apparent dynamic strength enhancement beyond the strain-rate of 102 s−1 is strongly influenced by the hydrostatic stress effect due to the lateral inertia confinement in a SHPB test.

TL;DR: In this paper, a collection of empirical formulae to predict the penetration depth, scabbing thickness and perforation thickness is presented in both Imperial and SI units and the current status of various design codes is summarized based on a dimensional analysis, dominant non-dimensional parameters that may influence the local impact effects on concrete targets are obtained and then used to present some of the test data Various nose shape factors are compared and a unique definition of the nose shape factor is suggested Analytical models and numerical simulation methods for penetration are summarized Criticisms are made for the current understanding of

TL;DR: In this paper, the authors defined the onset strain of densification and the densification strain are defined and distinguished in the present study, and the method based on the energy absorption efficiency curve gives unique and consistent results.

TL;DR: Zhang et al. as discussed by the authors employed numerical simulation to further demonstrate that the unexpected radial confinement in an SHPB test is responsible for the increase of the dynamic compressive strength of concrete-like materials at strain-rates from 10 1 to 10 3 ǫs −1.

TL;DR: Based on the dimensional analysis of concrete penetration by a non-deformable projectile and an analytical penetration model, two dimensionless numbers, i.e., the impact function I and the geometry function of projectile N are defined and used in a dimensionless formula to predict the penetration depth.