Open Access

ARTICLE

On the Simulation of Fragmentation During the Process of Ceramic Tile Impacted by Blunt Projectile with SPH Method in LS-DYNA

Yihua Xiao^{1, *}, Hecheng Wu¹, Xuecheng Ping^{2, *}

1 School of Mechatronics and Vehicle Engineering, East China Jiaotong University, Nanchang, China.
2 College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin, China.

* Corresponding Authors: Yihua Xiao. Email: ;
   Xuecheng Ping. Email: .

Computer Modeling in Engineering & Sciences 2020, 122(3), 923-954. https://doi.org/10.32604/cmes.2020.07686

Received 20 June 2019; Accepted 05 December 2019; Issue published 01 March 2020

Abstract

Ceramics are extensively used in protective structures which are often subjected to projectile impacts. During an impact process of a ceramic target by a projectile, fragmentation occurs in both the target and the projectile. It is challenging to simulate such events and predict residual mass and velocity of the projectile. In this work, we attempt to use smoothed particle hydrodynamics (SPH) in LS-DYNA to reproduce fragmentation of the target and the projectile and predict residual mass and velocity of the projectile during a projectile impact of a ceramic target. SPH models for an alumina ceramic tile impacted by a blunt tungsten heavy alloy projectile are established. SPH simulation results of residual mass and velocity of the projectile as well as ejecta and bulge movements of the ceramic tile are obtained and compared with experimental data and simulation results of other numerical approaches. It is found that SPH simulation can properly reproduce the impact fragmentation of the target and the projectile, and shows advantages over existing numerical approaches in the prediction accuracy of residual mass and velocity. Moreover, effects of some numerical aspects of SPH, including particle spacing, contact treatment and parameters in artificial viscosity and smoothing length, on simulation results are identified. A simple approach using identical smoothing length and balanced artificial viscosity is proposed to reduce particle spacing sensitivity. The observed parametric effects and the proposed approach will provide guidance to set appropriate parameters values for SPH simulation of impact fragmentation.

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