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	Comparison of Walker-Anderson model (black lines) to experimental result for bulging and perforation

The Walker-Anderson analytical penetration model, developed by Southwest Research Institute (SwRI), is based on momentum conservation along the projectile-target centerline. Originally developed for semi-infinite metallic armors, the model can be used to solve a wide range of problems including bulging and perforation, incorporating seven different exit failure modes. The analytical penetration model provides a fast-running, accurate capability to estimate penetration performance in metallic, ceramic, and fabric armors.

Analytical Penetration Modeling Applications

• Long-rod projectiles

• Small arms (armor-piercing and ball rounds)

• Fragment-simulating projectiles (FSP)

• Brittle materials (e.g., glass and ceramics)

• Ballistic fabrics

• Ballistic composites

• Estimates for ballistic protection such as V50, mass efficiency, and limit thickness

• Hypervelocity impact

Ballistic limit vs. thickness predictions for FSPs, and comparison to experimental data (solid lines are the model; experimental data are denoted by the symbols)		Comparison of fabric response model (solid lines) to experimental data (symbols)

Comparison of Walker-Anderson model (solid lines) to experimental data for tungsten alloy and steel L/D 10 long rods into armor steel targets		Comparison of Walker-Anderson model (solid lines) to nose and tail positions of a long rod penetrating an armor steel target

Comparison of VS–VR and V50 by Walker-Anderson model to experimental data		The analytical model reproduces the experimental data for tungsten long-rod penetration into a semi-infinite silicon carbide target

For more information about analytical penetration modeling capabilities at SwRI or how you can contract with SwRI, please contact James D. Walker, Ph.D. at jwalker@swri.org or (210) 522-2051.
 

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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

August 28, 2008