Analysis of Multi-Layered Materials Under High Velocity Impact Using CTH
Abstract
Multi-layer armor containing ceramic and metallic layers has become more common in the past two decades. Typically, ceramics have high compressive strength; that feature combined with their low density make them highly desirable for armor applications. This research effort numerically simulates ballistic impact of a cylindrical penetrator with a hemispherical tip on multi-layer metallic and ceramic targets of finite thickness. The projectile is made of S7 tool steel, while the target consists of rolled homogenous armor and boron carbide ceramic. The Eulerian hydrocode CTH, ideal for studying cases of gross global and local deformation, is used to perform an axisymmetric analysis of the projectile and the target. The Johnson-Holmquist constitutive model (JH-2) for brittle materials is used for the ceramic layers, and the Johnson-Cook constitutive model is used for the metallic layers. Various arrangements of ceramic and metallic layers were simulated over a range of velocities to quantitatively determine ballistic limits. Comparison of the ballistic limits for each configuration will determine which ceramic-metal lay-up arrangement is optimal for resisting penetration of the given projectile. This research shows that replacing multiple metallic target layers with B4C ceramic decreases the resistance of the target to the penetration of the projectile for a target of given thickness.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2008
- Accession Number
- ADA483307
Entities
People
- Jason K. Lee
Organizations
- Air Force Institute of Technology