Finite element models to predict the structural response of 120-mm sabot/rods during launch.

摘要

Numerical modeling techniques in two- and three-dimensions were used to predict the structural and mechanical behavior of sabot/rod systems while inbore and just after muzzle exit. Three-dimensional transient numerical simulations were used to predict the rod deformations and states of stress and strain caused by axial and lateral accelerations during launch. The numerical models include the launch tube, recoil motion, and sabot/rod system modeled as it transits the launch tube and exits. The simulated rod leaves the muzzle of the gun, and exit parameters, including transverse displacement, transverse velocity, pitch, and pitch rate are extracted from the analysis results. Results from the inbore numerical simulations were compared with previous full-scale experiments. The results of the comparisons indicated a predictive capability to model inbore three-dimensional phenomena. Two-dimensional analyses were used to model details of the structural behavior caused by the axial load environment. Methodology and results are presented for several launch environments. 7 refs., 16 figs., 5 tabs.