Development of an Air Gun Simulation Model Using LS-DYNA

摘要

This report presents an analytical methodology to simulate the dynamic impact response of a generic artillery component subjected to launch simulation in an air gun test environment. An air gun test provides an efficient and effective launch simulation platform designed for testing suitability and survivability of future artilleries or projectile components during their developmental stage. Lagrangian and Arbitrary Lagrangian/Eulenan methods are used to simulate the impact mitigation environment in which the kinetic energy of a projectile is absorbed by crushing aluminum (Al) honeycomb mitigator. Issues related to the effectiveness of these methods in simulating a high degree of distortion of Al honeycomb mitigator using the available LS-DYNA material models 126 (metallic honeycomb) and 63 (crushable foam) are discussed. Both computational methods lead to the same prediction for the deceleration of the test projectile and are able to simulate the behavior of the projectile. Good agreement between the test results and the predicted projectile response is achieved using the presented models and the methods employed. Development of such a simulation code significantly enhances the U.S. Army Research Laboratory's capability in addressing the customer's need in explaining projectile behavior during an air gun test and is useful in facilitating design and preparation of an effective air gun test.