动能弹高速侵彻混凝土弹体质量损失及头部形状演化研究

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中文摘要：动能弹在高速侵彻混凝土时会发生明显的质量损失，使得弹体的头部变钝，导致侵彻性能也会降低。弹体与混凝土目标之间的摩擦功、弹体的塑性变形以及骨料对弹体的切削会显著影响弹体的质量损失。首先，本文通过温度对弹体强度影响将三种机制进行耦合，建立了弹体质量损失和头部形状演变的离散迭代模型。在模型中，摩擦功和塑性功都会增加弹体表层的温度，从而降低这部分的强度，使其更容易因为骨料切削而发生质量损失。该模型将弹体头部和侵彻过程分别从空间和时间的维度上进行离散化处理。通过逐点迭代计算来获得弹体的质量损失和头部形状演化。然后，将模型预测的侵彻深度、质量损失和弹体的剩余头部形状与实验结果进行对比。对比结果表明，模型的预测结果与试验结果吻合较好，验证了模型的有效性。此外，还分析了侵彻过程中的弹体的侵彻深度、质量损失、减加速度、速度与时间的关系。最后，基于该模型讨论了弹体强度、CRH和混凝土靶的强度对侵彻过程的影响。

外文标题：Research on mass loss and nose shape evolution of kinetic energy projectiles penetrating concrete at high velocity

外文摘要：The high-speed penetration of concrete targets by kinetic energy projectiles results in apparent mass loss,which blunts the nose of the projectile and decrease its penetration performance.The friction work between the projectile and the concrete target,the plastic deformation of the projectile,and the cutting of aggregates to the projectile significantly affect the mass loss of the projectile.To address these effects,a discrete iterative model is developed for the mass loss and nose shape evolution of the projectile by coupling three mechanisms based on the effect of temperature on strength.In the model,both friction work and plastic work increase the temperature of the projectile's surface layer,thereby weakening the strength of this part and rendering it easier for mass loss to occur due to aggregate cutting.The model discretizes the projectile and penetration process with respect to the space and time dimensions,respectively.The mass loss and nose shape evolution of the projectile are obtained by iteratively calculating a point-by-point regression.The predicted depth of penetration(DOP),mass loss,and residual projectile profile are compared with experimental data to validate the model.The comparison shows satisfactory agreement between the calculated results and experimental data.Additionally,the deceleration,velocity,DOP,and mass loss during penetration are analyzed with respect to time.Finally,based on the model,the effects of projectile strength,caliber-radius-head(CRH),and concrete target strength on penetration are discussed.

外文关键词：

Kinetic energy projectileHigh-velocity penetrationCoupled modelMass lossNose shape evolution

作者：

姚志彦、黄风雷、李金柱

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作者单位：

State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China

关键词：

Kinetic energy projectile High-velocity penetration Coupled model Mass loss Nose shape evolution

基金：

Exploratory Research Fund of State Key Laboratory of Explosion Science and Safety Protection

项目编号：

出版年：

2024

DOI：

10.1007/s10409-024-23410-x

力学学报(英文版)

CSTPCD

影响因子：0.363

ISSN：0567-7718

年,卷(期)：2024.40(7)