Wrinkling of Orthotropic Viscoelastic Membranes
This paper presents a simplified simulation technique for orthotropic viscoelastic membranes. Wrinkling is detected by a combined stress–strain criterion and iterative scheme searches for the wrinkle angle using a pseudoelastic material stiffness matrix based on a nonlinear viscoelastic constitutive model. This simplified model has been implemented in ABAQUS/Explicit and is able to compute the behavior of a membrane structure by superposition of a small number of response increments. The model has been tested against a published solution for a time-independent isotropic membrane under simple shear and against experimental results on Stratofilm 420 under simple shear.
© 2011 by Xiaowei Deng and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Presented as Paper 2010-2670 at the 11th AIAA Gossamer Forum, Orlando, FL, 12–15 April 2010; received 28 March 2011; revision received 23 June 2011; accepted for publication 14 July 2011. This research was supported by the NASA Balloon Program Office (contract monitor Danny Ball). We thank the NASA Super-Pressure Balloon Team for their contributions to this research. In particular, Loren Seely (Aerostar International) has provided film samples, and David Wake!eld (Tensys Dynamics, Ltd.) and Jim Rand (Winzen Engineering, Inc.) have helped with valuable comments. This paper was selected as the Best Paper at the 11th AIAA Gossamer Systems Forum in Orlando, Florida.
Published - Deng2012p17632Aiaa_J.pdf