Computational Model Analyzes Failure in Reentry Parachute Energy Modulators

This study focuses on the computational modeling of failure at the fabric weave level in reentry parachute energy modulators (EMs). EMs are designed to dissipate snatch loads during parachute deployment, but recent flight testing has shown increasing variability in their behavior. To address this, a computational model was developed using LS-DYNA to simulate the EM at the fabric weave level. The model captures the geometry and material behavior of the EM stitching pattern, with individual Kevlar and nylon threads modeled as 3D solid elements. The simulation aims to understand the failure mechanisms of the nylon stitching and Kevlar weave during EM shredding events. The model incorporates material properties, contact, failure conditions, and boundary conditions to assess the dynamic response of a stitch during tensile loading. This approach provides deeper insight into the cause of EM shredding, which is challenging to identify through mechanical testing due to the inherent unpredictability of fabric behavior and the high variability of flight loading conditions. The results of this study can be used to optimize EM design and improve the reliability of parachute systems.

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