Elastic properties of large tow 2-D braided composites by numerical and211 analytical methods

摘要

The homogenized extensional and flexural properties of a large tow, two-211u001edimensional, braided carbon-fiber composite lamina were evaluated using 211u001eanalytical and numerical methods. The plane-stress composite lamina was assumed 211u001eto be periodic in its plane and was modeled with a single representative volume 211u001eelement. The homogenized elastic properties were analytically estimated using 211u001ebeam-theory concepts and upper and lower bound techniques as well as using three-211u001edimensional finite element analyses. The homogenized extensional and bending 211u001elamina properties are, in general, distinct properties and are not simply related 211u001eto each other as in monolithic beams and plates or in composites with very fine 211u001eand highly periodic microstructures. The importance and cause of distinct 211u001ehomogenized extensional and flexural elastic properties is briefly discussed.