Study on the Mechanism of Secondary Penetration of Long-rod Projectile and Its Influencing Factors

Kui TANG; Jinxiang WANG; Liangtao LIU; Ming YANG

doi:10.12382/bgxb.2023.0035

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Study on the Mechanism of Secondary Penetration of Long-rod Projectile and Its Influencing Factors

更新时间：2025-08-18

- Study on the Mechanism of Secondary Penetration of Long-rod Projectile and Its Influencing Factors
- Acta Armamentarii Vol. 44, Issue 12, Pages: 3707-3718(2023)
- 作者机构：
  
  南京理工大学瞬态物理国家重点试验室, 江苏南京 210094
- 作者简介：
- 基金信息：
- DOI：10.12382/bgxb.2023.0035
  CLC：
- Received：18 January 2023，
  
  Published Online：12 January 2024，
  
  Published：30 December 2023
- 稿件说明：
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Kui TANG, Jinxiang WANG, Liangtao LIU, et al. Study on the Mechanism of Secondary Penetration of Long-rod Projectile and Its Influencing Factors[J]. Acta Armamentarii, 2023, 44(12): 3707-3718.
DOI：

Kui TANG, Jinxiang WANG, Liangtao LIU, et al. Study on the Mechanism of Secondary Penetration of Long-rod Projectile and Its Influencing Factors[J]. Acta Armamentarii, 2023, 44(12): 3707-3718. DOI： 10.12382/bgxb.2023.0035.

摘要

针对长杆弹侵彻半无限厚金属靶过程中第3侵彻阶段机理不清的问题

建立了三维光滑粒子流体动力学有限元模型

在验证模型有效性的基础上

开展了金杆侵彻半无限厚7075-T6铝靶研究

对第3侵彻阶段机理进行探索

并分析弹/靶密度、强度和弹体长径比对侵彻的影响规律。研究结果表明:金杆侵彻7075-T6铝靶的侵彻深度曲线在高速段显著超过流体动力学极限是由倒转金杆碎片对靶板的二次侵彻造成的;金杆销蚀后形成管状碎片体

高初速下其速度较大

其方向与侵彻方向一致

且其密度大

因此它会在弹体完全销蚀后继续侵彻靶体;金杆的二次侵彻深度随撞击速度增大呈“S”形增大

它对总侵彻深度的贡献在3km/s撞击速度下甚至高达15.6%;存在二次侵彻时

长杆弹侵彻半无限靶第3侵彻阶段划分为剩余侵彻和二次侵彻阶段更合适;高弹靶密度比有利于形成二次侵彻现象;靶体密度和强度对总侵彻性能的影响显著超过弹体密度和强度;无论是保持弹体长度还是质量不变

长径比对流体动力学侵深和总侵深有显著的影响

但对二次侵彻的影响却较小。

Abstract

A 3D SPH-FEM finite element model is established to further investigate the penetration mechanism of long-rod projectile at the third penetration stage. On the basis of verifying the effectiveness of the model

a penetration of gold rod against a semi-infinite thick 7075-T6 aluminum target is studied

the mechanism of the third penetration stage is explored

and the influence law of projectile/target density and strength

and

L/D

of projectile on penetration is also analyzed. The calculated results show that the reason why the

P/L

vs. striking velocity curve for gold rod penetrating 7075-T6 aluminum target is broken is the secondary penetration of the inverted rod debris. A tubular fragment is formed after the gold rod is eroded. At high initial velocity

its velocity is higher

its direction is consistent with the penetration direction

and its density is large. Therefore

it will continue to penetrate the target after the projectile body is completely eroded. The secondary penetration depth of the gold rod increases in an “S” shape with the increase in striking velocity

and its contribution to the total penetration depth is even as high as 15.6% at striking velocity of 3km/s. When there is a secondary penetration

it is more appropriate to divide the third penetration stage into residual and secondary penetration stages. High projectile-target density ratio is beneficial for the formation of secondary penetration. The influence of the target density and strength on the penetration capability significantly exceeds that of the projectile. Under the conditions of the unchanged length or mass of the projectile

the effect of length-to-diameter ratio on the hydrodynamics and total penetration depth is significant

but its effect on the secondary penetration is small.

关键词

Keywords

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