Projectile Penetration of Elastic-Plastic Earth Media

by Lewis Thigpen, Dept. of Civ. Engrg., Lowell Tech. Inst., Lowell, MA; Member of Tech. Staff, Theoretical Fluid Dynamics Div., Sandia Labs., Albuquerque, NM,

Serial Information: Journal of the Geotechnical Engineering Division, 1974, Vol. 100, Issue 3, Pg. 279-294

Document Type: Journal Paper


The penetration of projectiles into earth materials is described. Some factors influencing the constitutive equations for this continuum are analyzed and example numerical solutions using a two-dimensional wave propagation code are given for penetrations into two rock materials. The theory is based on the assumption that both the projectile and penetrated medium can be represented as an elastic-plastic continuum. Response quantities evaluated include deformation and displacements of the penetrated medium, and depth, velocity, and deceleration of the projectile during penetration. Data presented for both projectile and target response are in good qualitative agreement with experimental observations.

Subject Headings: Projectile penetration | Elastic analysis | Earth materials | Constitutive relations | Two-dimensional analysis | Numerical analysis | Wave equations | Wave propagation

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