Bending Behavior of Plain-Woven Fabric Air Beams: Fluid-Structure Interaction Approach
NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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A swatch of plain-woven fabric was subjected to biaxial tests to determine its material characteristics. The stress-strain relationships of the fabric were determined and used directly in finite element models of an air beam that was assumed to be constructed of the same fabric and subjected to inflation and bending events. The structural responses to these events were obtained using the ABAQUSExplicit finite element solver for a range of pressures, including those considered to be typical in safe operations of air-inflated structures. The models accounted for the fluid-structure interactions between the air and the fabric. The air was treated as a compressible fluid in accordance with the Ideal Gas Law and was subjected to adiabatic constraints during bending. The fabric was represented with membrane elements. Several constitutive cases, including linear elasticity and hyperelasticity, were studied. The bending behavior for each constitutive case is presented, followed by a discussion of the use and limitations of the cases.
- Numerical Mathematics