Validation of Computational Structural Dynamics Models for Parachute Systems

Abstract

A validation study was performed to evaluate the ability of two computational structural dynamics models (TENSION and LS-DYNA) to accurately simulate the mechanical behavior of fabric structures such as parachute systems. The validation tests involved large shape changes of fabric structures and therefore evaluated the ability of the models to simulate fabric anisotropy and wrinkling in a geometrically nonlinear analysis. Experimental results from three distinct laboratory tests were used to perform the validation study. The first test was a fabric cylinder that was loaded biaxially through internal pressure and axial extension. The second test was a square airbag that was internally pressurized. The third test was a round parachute model with hydrostatic loading. Validation of these computational models will provide the parachute industry with the required technical evidence that these tools are appropriate for design of parachute systems.