Ejecta from periodic grooved Sn surface under unsupported shocks

Abstract

Dynamic failure and ejection characteristics of a periodic grooved Sn surface under unsupported shock loading are studied using a smoothed particle hydrodynamics method. An "Eiffel Tower" spatial structure is observed, which is composed of high-speed jet tip, high-density jet slug, longitudinal tensile sparse zone, and complex broken zone between grooves. It is very different from the spike-bubble structure under supported shocks, and has been validated by detonation loading experiments. In comparison with that under supported shocks at the same peak pressure, the high-speed ejecta decreases obviously, whereas the truncated location of ejecta moves towards the interior of the sample and the total mass of ejecta increases due to the vast existence of low-speed broken materials. The shock wave profile determines mainly the total ejection amount, while the variation of V-groove angle will significantly alter the distribution of middle-and high-speed ejecta, and the maximum ejecta velocity has a linear correlation with the groove angle.

Rayleigh–Taylor and Richtmyer–Meshkov instabilities: A journey through scales

“…The direct effect of the interaction of the shock with the enough that the material breaks up into sharply defined 2579 layers, as also observed by [310].…”

An improved model of damage depth of shock-melted metal in microspall under triangular wave loading*

“…Since the incident shock wave is a triangular wave, the interface velocity continues to decay. The selfdeveloped 2D SPH code [25,26] is used to determine the peak stress and decay length of the incident triangular wave. Therefore, the stress profile of the incident triangular wave in shot 1 and shot 2 can be determined, as shown in Fig.…”

“…The microspall simulations of tin are carried out using a self-developed 2D SPH code. [25,26] In the SPH method, the material is discretized into a series of particles with independent information. Due to its Lagrangian nature, SPH has the advantage of simulating free-surface flows with large deformations.…”

Microjet formation from the grooved surface of aluminum under shock waves with different pulse durations

“…Theoretically, Piriz et al [23] proposed an analytical model based on the linear Richtmyer-Meshkov instability (RMI) in solids under the conditions of high-energy-density, and showed that plasticity determined the maximum perturbation amplitude and provides simple scaling laws. Besides, molecular dynamics (MD) [1,12,24,25], Eulerian [14,26,27], and smoothed particle hydrodynamics (SPH) [28][29][30] methods have all been used to simulate the microjet formation. Dimonte et al [31] described a simple algebraic model for the microjet based on the hydrodynamics and MD simulations of the RMI.…”

“…Shao et al [11,13,33] presented the effects the shockwave profile on the microjet morphology and mass with MD simulations. Besides, Wang et al [28,34] discussed the dependence of microjet on the shock wave front with SPH simulations. The systematic understanding of the microjet induced by supported shock has been achieved, but the influence of shock profile on microjet is still lack of pertinent research and only a few comparisons of the triangular waves and supported waves reported [12,28,33].…”