Computational modeling of fluid-structure-interaction (FSI) of supersonic parachute deployment is a challenging task. A recent research collaboration between the Farhat Research Group (FRG) at Stanford University and the Jet Propulsion Laboratory (JPL) at the California Institute of Technology is aimed to develop such modeling capability using FRG's AERO Suite. As part of this effort, various structural aspects of the problem are being investigated in order to accurately capture relevant physical phenomena in the computational simulation. Recently, a supersonic parachute test was performed by the Advanced Supersonic Parachute Inflation Research Experiment (ASPIRE) program at JPL. Post-test inspection of the parachute canopy indicates shear-like behavior on the parachute canopy along the seams. In this paper, coupon-level simulation tests are presented to investigate the effects of various seam modeling techniques on the accurate prediction of the fabric behavior under uniaxial loading conditions. Two different element types are utilized to model the seams and are compared with each other: 2D beam elements and 3D membrane elements. In the second part of this paper, a nonlinear orthotropic material constitutive law is investigated. The material model has a tabular format which allows capturing nonlinear biaxial stress-strain relationships often encountered in fabric. The results from AERO Suite's structural analyzer AERO-S are compared to LS-DYNA® numerical code. The results from this study will guide the development of a refined version of a disk-gap-band (DGB) parachute structural model that will be used in the simulation of the FSI supersonic parachute deployment.
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