Numerical Simulation Study of High-strength Projectile Penetrating White Granite Target
Received date: 2020-12-27
Revised date: 2021-03-12
Online published: 2021-07-14
It is of great significance to investigate the penetration effect of high strength projectile on rock mass for the development of rock breaking technology in mine drilling.The penetration process is a process with large deformation of material.It is difficult for traditional finite element method to solve the problem with large deformation,which will lead to mesh distortion and calculation disruption.In order to obtain the damage responses of white granite under the condition of high speed penetration,the HJC material model was employed to model the white granite target and the projectile was assumed to be rigid.The HJC model was calibrated by the SHPB test data and the results show that the HJC model is capable to model the mechanical behavior of white granite under high strain rate conditions.The nonlinear finite element analysis software LS-DYNA was utilized and an SPH-FEM coupled method was developed to overcome the penetration problem with large deformation of granite target.A series of numerical simulation of projectile impacting white granite target with different velocity were carried out.The projectile is with diameter of 20 mm,CRH of 3 and length-diameter ratio of 6.The simulation results show that the SPH-FEM method can effectively simulate the mechanical damage response of rock target subjected to high speed impact.Based on the relationship between different impact velocities and penetration depth,an empirical formula for penetration depth of white granite is obtained,which can be used to predict the penetration depth of rock mass with similar strength.Finally,the effects of different nose shapes on penetration performance was studied. The results show that the penetration performance of flat-nose projectile is much lower than that of ogive-nose projectile,and the penetration damage area is smaller.The penetration depths of flat-nose projectile at initial velocity of 50,100,150,200,250 and 300 m/s are 16.7%,27.8%,35.1%,32.1%,36.1%,40.5% of the penetration depths of ogive-nose projectile,respectively.
Jin HUANG , Kewei LIU , Shaohu JIN . Numerical Simulation Study of High-strength Projectile Penetrating White Granite Target[J]. Gold Science and Technology, 2021 , 29(3) : 411 -420 . DOI: 10.11872/j.issn.1005-2518.2021.03.007
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