Computationally efficient structural modeling of reinforced, inflatable, braided fabric tubes.

Published: 2017

Author(s):
Young, A.
Davids, W. G.
Clapp, J.
Goupee, A. J.

Publication Name: Journal of Engineering Mechanics / Volume 143 Issue 6

Publication URL: https://ascelibrary.org/doi/10.1061/%28ASCE%29EM.1943-7889.0001212

Research Area:
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Keywords:

Abstract:

Braided, inflatable structural members with axial reinforcing cords have the ability to accommodate loading with a low mass and small storage volume. These members are particularly attractive for space-based applications. There is currently a need to develop computationally efficient structural design methodologies for these unique, compliant, inflatable structural members so that engineers can more-effectively perform structural analyses and conduct structural-optimization studies. In this paper, an analysis methodology is developed for the three-dimensional, large-displacement, materially nonlinear behavior of these inflatable, slender members that includes the effect of the internal inflation pressure. A three-dimensional, corotational, flexibility-based fiber-beam element is employed to handle geometric and material nonlinearities. Comparisons are made with the in-plane and out-of-plane response of component-level testing of inflatable straight tubes, as well as to higher-fidelity shell-based finite-element models. The model results show good agreement with both shell-based finite element (FE) models (with a significantly decreased number of degrees of freedom), and results of component-level tests well past the point where test specimens lose internal prestress due to bending and exhibit a nonlinear response.