Multiphase theory of granular media and particle simulation method for projectile penetration in sand beds
Multiphase theory of granular media and particle simulation method for projectile penetration in sand beds
复制标题
颗粒介质多相理论及砂床弹丸侵彻颗粒模拟方法
DOI：
10.1016/j.ijimpeng.2021.103962
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发表时间：
2021-11
影响因子：
5.1
通讯作者：
Fanbiao Bu
中科院分区：
文献类型：
--
作者：
Man Cui;Fuzhen Chen;Fanbiao Bu
研究弹丸侵彻沙层对于解决武器毁伤、地基固结、地雷爆炸等领域的实际问题具有重要意义。在这项研究中，建立了一个利用弹-粘-塑-动本构关系和离散粒子动力学的耦合模型来描述类砂材料的多相，即类固体、类液体、类气体和惯性离散相。采用线弹性模型来描述类固相；然而，在达到塑性屈服点后，基于流变学的粘塑性本构模型被用来描述这种液态相。当颗粒的体积分数减少到一定值时，利用颗粒流动力学理论描述气相；然而，当不再满足二元碰撞的假设时，离散粒子动力学被用来描述这种惯性离散相。基于已建立的砂状材料多相模型，使用平滑离散颗粒流体动力学与离散元方法相结合来离散我们的模型。我们的新理论模型和数值方法用于模拟球形和细长弹丸在干沙堆积中的高速侵彻。与实验结果和其他数值方法的比较表明，新的数值方法适合描述砂类物质因不同的弹体侵彻速度而产生的不同运动状态。最后，捕获了锥形弹丸穿透沙床的跳弹现象，进一步验证了我们的模型解决工程问题的适用性。
Studying projectile penetration in sand beds is of great significance for solving practical problems in the fields of weapon damage, consolidation of foundations, and mine explosions. In this study, a coupled model using the elastic-viscoplastic-kinetic constitutive relation and discrete particle dynamics was established to describe the multiple phases of sand-like materials, namely, the solid-like, liquid-like, gas-like, and inertial discrete phases. A linear elastic model was used to describe the solid-like phase; however, after the plastic yield point was reached, a viscoplastic constitutive model based on rheology was used to describe this liquid-like phase. When the volume fraction of the particles reduced to a certain value, the gas-like phase was described using the kinetic theory of granular flow; however, when the assumption of binary collisions was no longer satisfied, discrete particle dynamics was used to describe this inertial discrete phase. Smoothed discrete particle hydrodynamics coupled with the discrete element method was used to discretize our model based on established multiphase models of sand-like materials. Our new theoretical model and numerical method were used to simulate the high-speed penetration of spherical and slender projectiles in dry sand accumulation. A comparison with the results from experiments and other numerical methods shows that the new numerical method is suitable for describing the different motion states of sand-like materials owing to different projectile penetration velocities. Finally, the ricochet phenomenon of a conical projectile penetrating a sand bed was captured, which further verifies the applicability of our model for solving engineering problems.
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DOI：
--
发表时间：
1969
期刊：
Journal of the Soil Mechanics and Foundations Division
影响因子：
--
作者：
C. Young
通讯作者：
C. Young
DOI：
--
发表时间：
--
期刊：
Crelle's Journal
影响因子：
--
作者：
Hertz
通讯作者：
Hertz
DOI：
10.7498/aps.63.230206
发表时间：
2014-12
期刊：
--
影响因子：
--
作者：
C. Fu-zhen;Qiang Hong-fu;Gao Wei-ran
通讯作者：
C. Fu-zhen;Qiang Hong-fu;Gao Wei-ran
DOI：
10.1103/physreve.93.012907
发表时间：
2015-08
期刊：
Physical review. E
影响因子：
--
作者：
J. Ellowitz
通讯作者：
J. Ellowitz
DOI：
10.1098/rspa.1954.0186
发表时间：
1954-01-01
影响因子：
--
作者：
BAGNOLD, RA
通讯作者：
BAGNOLD, RA