An experimental and numerical study of 3-D braided structural textile composites
It has been reported in literature that isostrain models (also known as Fabric Geometry Models) provide good predictions of the elastic moduli of three-dimensional textile composites. This study reports a critical evaluation of the accuracy of the isostrain models by comparing the predictions against experimental measurements as well as finite element simulations of representative unit cells of the 3-D braided composites, over a range of braid angles and volume fractions. The accuracy of the isostrain model is found to be highly sensitive to the braid angles and the fraction of lay-in axial fibers in the composite system. Good correlations between isostrain model predictions of elastic moduli and measurements were observed when the loading direction is oriented along one of the fiber directions and is significantly away from the other fiber systems in the unit cell. In other situations, however, the isostrain model predictions were in significant errors. This study also reports on the influence of various modeling parameters in the development of finite element models for the simulation of the 3-D textile composite unit cells.
- Drexel Univ., Philadelphia, PA (United States). Materials Engineering Dept.
- Martin-Marietta, East Windsor, NJ (United States)
- Publication Date:
- OSTI Identifier:
- Report Number(s):
ISBN 1-56676-220-0; TRN: IM9536%%325
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- Resource Relation:
- Conference: 9. technical conference of the American Society for Composites, Newark, DE (United States), 20-22 Sep 1994; Other Information: PBD: 1994; Related Information: Is Part Of Proceedings of the American Society for Composites: Ninth technical conference; PB: 1319 p.
- Technomic Publishing Co., Inc., Lancaster, PA (United States)
- Country of Publication:
- United States
- 36 MATERIALS SCIENCE; COMPOSITE MATERIALS; COMPRESSION STRENGTH; GRAPHITE; EPOXIDES; TEXTILES; MATHEMATICAL MODELS; STRESSES; STRAINS; STRAIN GAGES; YOUNG MODULUS; MICROSTRUCTURE; OPTICAL MICROSCOPY; SIMULATION; FINITE ELEMENT METHOD; EXPERIMENTAL DATA