1 Modeling of Viscoelasticity in Thin Flexible Composites using Coincident Element Method Thomas (TJ) Rose 1 Roccor, Longmont, CO, 80503, USA University of Colorado, Boulder, Colorado, 80309, USA Julia Calish 2 Roccor, Longmont, CO, 80503, USA Francisco Lopez Jimenez 3 University of Colorado, Boulder, Colorado, 80309, USA With the recent increase in demand for deployable structures in the satellite industry high strain composites have become a more commonly utilized due to their thermal stability and weight to stiffness ratios. Along with their advantages come inherent challenges associated with creep and viscoelasticity, where the ability to predict these behaviors has become increasingly in demand. The focus of this study is on the evaluation of the coincident element method, which is known to be a method to incorporate readily available functionality from the ABAQUS software package into a robust prediction tool. This evaluation focuses on the sensitivities of the coincident element method to illustrate the ways in which the method can be most effectively tuned to empirical data. Future studies will focus in development of methods for validating this method against empirical models to develop confidence in analytical predictions of these complex high strain composite structures. I. Nomenclature HSC = High Strain Composite DoD = Department of Defense CEM = Coincident Element Method IVS = Isotropic Viscoelastic Shell OES = Orthotropic Elastic Shell CBT = Column Bend Test UUT = Unit Under Test LD-FPBT = Large Deformation Four Point Bend Test II. Introduction Recent trends in the space industry have shown substantial growth in satellite production (Fig. 1), with commercial, research, and DoD entities all interested in putting hardware in space as efficiently as possible. Small satellites are particularly good for constellations, which enable more global coverage and redundancy. There are at least eight large constellation programs currently underway [1] and many more being proposed every day. This increased demand for smaller, more efficient satellites has mobilized the industry toward creative and agile solutions. 1 Sr. Analyst, Test and Analysis, and AIAA Member 2 Analyst, Test and Analysis, and AIAA Member 3 Professor, Smead Aerospace Engineering, and AIAA Member Downloaded by UNIVERSITY OF COLORADO - BOULDER on August 13, 2020 | http://arc.aiaa.org | DOI: 10.2514/6.2020-0693 AIAA Scitech 2020 Forum 6-10 January 2020, Orlando, FL 10.2514/6.2020-0693 Copyright © 2020 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. AIAA SciTech Forum
Modeling of Viscoelasticity in Thin Flexible Composites using Coincident Element Method
Jun 04, 2023
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