Numerical and experimental dynamic characteristics of thin-film membranes

Presented here is a new total-Lagrangian displacement-based finite-element formulation for plates and shells undergoing large displacements and rotations. The theory fully accounts for geometric nonlinearities, general initial curvatures, and extensionality by using Jaumann stress and strain measures, an exact coordinate transformation, and orthogonal virtual rotations. Moreover, transverse shear deformations are accounted for by using a first-order shear deformation theory with shear correction factors obtained by matching the shear strain energy and stress resultants with those of a general layerwise higher-order shear deformation theory. Large static deformations of several different plates and shells under different loading and boundary conditions are obtained. Comparison with available results in the literature reveals that the finite-element model is accurate in predicting large deformations of highly flexible two-dimensional structures.

Total-Lagrangian Formulation and Finite-Element Analysis of Highly Flexible Plates and Shells

NASA’s recent space programs require the use of many ultra-lightweight deployable/inflatable structures, but there are many modeling, analysis and testing problems. This paper presents a new modeling technique that uses Jaumann strains and stresses and new concepts of local displacements and orthogonal virtual rotations to derive geometrically exact structural theories for such Highly Flexible Structures (HFSs). Moreover, a total-Lagrangian finite element code GESA (Geometrically Exact Structural Analysis) is being developed by implementing these new structural theories for the modeling, analysis, and fast prototyping of HFSs. The modeling technique is described, and finite element results from GESA and numerically exact solutions from the use of a multiple shooting method are used to demonstrate nonlinear mechanics of HFSs. The use of buckling, self-locking, and other nonlinear phenomena in the design of mechanism-free deployable/inflatable structures is presented. Moreover, experimental verifications of nonlinear statics and dynamics of HFSs using a Polytec PI PSV-200 scanning laser vibrometer and a 3D motion analysis system are shown. Other challenging issues and applications of HFSs are also discussed.

Modeling, Analysis and Testing of some Deployable/Inflatable Structures

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Numerical and Experimental Dynamic Characteristics of Thin-Film Membranes

This paper describes the development and use of a balloon cross tailoring method for providing a cost effective solution for balloon construction. The relevance of this method, particularly in developing countries where the raw material costs are high and labour costs are low, is discussed. How optimisation instead of standardisation of shell and cap thickness combination has resulted in reduction in the balloon volume and consequently the weight without compromising the maximum altitude and payload capability is presented.

Development of cost effective balloon design and fabrication methods

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Development of cost effective balloon design and fabrication methods