Stability analyses of the mass abrasive projectile high-speed penetrating into concrete target. Part Ⅱ： Structural stability analyses

• Published in: Acta mechanica Sinica Vol. 30; no. 6; pp. 943 - 955
• Main Authors: Wu, Hao, Chen, Xiao-Wei, Fang, Qin, He, Li-Lin
• Format: Journal Article
• Language: English
• Published: Heidelberg The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences 01.12.2014
• Subjects: Abrasion; Abrasion resistance; Angle of attack; Asymmetry; Classical and Continuum Physics; Computational Intelligence; Concretes; Engineering; Engineering Fluid Dynamics; High speed; Nose; Penetration; Projectiles; Research Paper; Theoretical and Applied Mechanics; 大众; 屈服准则; 混凝土强度; 磨料; 稳定性分析; 结构稳定性; 高速侵彻; 高速弹丸; Oblique angle; High-speed penetration; Concrete; Asymmetrical nose abrasion; Attacking angle; Projectile
• ISSN: 0567-7718; 1614-3116
• DOI: 10.1007/s10409-014-0070-5

The initial oblique and attacking angles as well as the asymmetrical nose abrasion may lead to bending or even fracture of a projectile,and the penetration efficiency decreases distinctly.The structural stability of a high-speed projectile non-normally penetrating into concrete and the parametric influences involved are analyzed with the mass abrasion taken into account.By considering the symmetrical or asymmetrical nose abrasion as well as the initial oblique and attacking angles,both the axial and the transverse drag forces acting on the projectile are derived.Based on the ideal elastic-plastic yield criterion,an approach is proposed for predicting the limit striking velocity（LSV）that is the highest velocity at which no yielding failure has occurred and the projectile can still maintain its integral structural stability.Furthermore,some particular penetration scenarios are separately discussed in detail.Based on the engineering model for the mass loss and nose-blunting of ogive-nose projectiles established in Part I of this study,the above approach is validated by several high-speed penetration tests.The analysis on parametric influences indicates that the LSV is reduced with an increase in the asymmetrical nose abrasion,thelength-diameter-ratio,and the concrete strength,as well as the oblique and attacking angles.Also,the LSV raises with an increase in the initial caliber-radius-head（CRH）and the dimensionless cartridge thickness of a projectile.