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Micromechanics Modeling of Textiles for Re-Entry Parachute ApplicationsRecent flight test projects and NASA missions have highlighted the challenges associated with accurately and efficiently modeling the behavior of parachute deployment systems needed for parachute design. Moreover, parachute deployment has been identified as one of the higher risk components for such missions. The analysis of textile fabrics used for atmospheric entry is inherently complex due to the multiple scales present in the fabric structure, including individual fiber filaments at the microscale, yarn bundles of fibers at the mesoscale, and the overall woven fabric at the macroscale. Computational tools for simulating fabric behavior must be able to account for the different mechanisms present at each scale without sacrificing computational efficiency. This work examines the generalized multiscale method of cells micromechanics theory, which has previously been used for the analysis of reinforced composite structures, to unreinforced textile fabrics. Modifications to the existing composite multiscale framework, implemented in NASA’s Multiscale Analysis Tool (NASMAT), include the specific mechanics unique to unreinforced textile fabrics, and overcoming the assumptions of a fixed fiber angle. It looks to assess the feasibility of using the NASMAT tool for efficient prediction of the response of unreinforced fabrics to loading such that it can ultimately be applied to fluid structure interaction tools for the prediction of parachute deployment systems. In this work, fabric behavior is simulated in NASMAT through homogenization of a triply periodic repeating unit cell, where the geometry of the subcells can change as a function of loading to represent the relative rotation and uncrimping that can occur in fabric tows. Predictions from the amended NASMAT code are compared to experimental data for uniaxial and off-axis tension to verify the ability of the code to incorporate lower-scale mechanics in prediction of unreinforced fabrics under loading.
Document ID
20205011621
Document Type
Technical Memorandum (TM)
Authors
Brandon L Hearley (North Carolina State University Raleigh, North Carolina, United States)
Evan J Pineda (Glenn Research Center Cleveland, Ohio, United States)
Brett A Bednarcyk (Glenn Research Center Cleveland, Ohio, United States)
Scott M Murman (Ames Research Center Mountain View, California, United States)
Mark Pankow (North Carolina State University Raleigh, North Carolina, United States)
Date Acquired
December 16, 2020
Publication Date
February 1, 2021
Subject Category
Mechanical Engineering
Report/Patent Number
E-19913
NASA/TM-20205011621
Funding Number(s)
CONTRACT_GRANT: 80GRC019D0001
WBS: 335803.04.28.22.10
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
Single Expert
Keywords
Micromechanics
fabrics
solid mechanics
parachutes

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