Bending response of 3D woven and braided preform composite materials
Abstract
Three dimensional textile carbonepoxy composites exhibit general anisotropy. Further, these materials may possess different modulus in uniaxial tension than that in compression. In an earlier material characterization effort, the tension, compression, and shear properties of these composites were determined. In this paper, theoretical modeling of flexure of the textile composites and experimental correlation are presented. Four point bending tests were conducted according to STM D709 standards to determine the load to midspan deflection relationships for typical textile composites. The results of experimental analysis are compared with classical beam theory, theory of elasticity solutions considering material orthotropy and shear deflection, and finite element analysis considering material orthotropy and finite deformation/rotations. The derivation of a harmonic function, required for the theory of elasticity solution, is described in the paper. Homogeneous orthotropic elastic properties are assumed for the 3D textile composites, which is a reasonable approximation for specimens considerably larger than the repeated geometric unit of the fiber preform. The so called ``flex modulus`` is determined from the experimental data.
 Authors:

 Univ. of Delaware, Newark, DE (United States)
 Lockheed Aeronautical Systems Company, Marietta, GA (United States)
 Publication Date:
 OSTI Identifier:
 89897
 Report Number(s):
 CONF9409291
ISBN 1566762200; TRN: IM9536%%327
 Resource Type:
 Book
 Resource Relation:
 Conference: 9. technical conference of the American Society for Composites, Newark, DE (United States), 2022 Sep 1994; Other Information: PBD: 1994; Related Information: Is Part Of Proceedings of the American Society for Composites: Ninth technical conference; PB: 1319 p.
 Country of Publication:
 United States
 Language:
 English
 Subject:
 36 MATERIALS SCIENCE; COMPOSITE MATERIALS; FLEXURAL STRENGTH; CARBON FIBERS; EPOXIDES; TEXTILES; MATHEMATICAL MODELS; ELASTICITY; STRUCTURAL BEAMS; FINITE ELEMENT METHOD; STRESSES; STRAINS; EXPERIMENTAL DATA; CORRELATIONS
Citation Formats
Pochiraju, K, ParviziMajidi, A, Chou, T W, and Shah, B. Bending response of 3D woven and braided preform composite materials. United States: N. p., 1994.
Web.
Pochiraju, K, ParviziMajidi, A, Chou, T W, & Shah, B. Bending response of 3D woven and braided preform composite materials. United States.
Pochiraju, K, ParviziMajidi, A, Chou, T W, and Shah, B. Sat .
"Bending response of 3D woven and braided preform composite materials". United States.
@article{osti_89897,
title = {Bending response of 3D woven and braided preform composite materials},
author = {Pochiraju, K and ParviziMajidi, A and Chou, T W and Shah, B},
abstractNote = {Three dimensional textile carbonepoxy composites exhibit general anisotropy. Further, these materials may possess different modulus in uniaxial tension than that in compression. In an earlier material characterization effort, the tension, compression, and shear properties of these composites were determined. In this paper, theoretical modeling of flexure of the textile composites and experimental correlation are presented. Four point bending tests were conducted according to STM D709 standards to determine the load to midspan deflection relationships for typical textile composites. The results of experimental analysis are compared with classical beam theory, theory of elasticity solutions considering material orthotropy and shear deflection, and finite element analysis considering material orthotropy and finite deformation/rotations. The derivation of a harmonic function, required for the theory of elasticity solution, is described in the paper. Homogeneous orthotropic elastic properties are assumed for the 3D textile composites, which is a reasonable approximation for specimens considerably larger than the repeated geometric unit of the fiber preform. The so called ``flex modulus`` is determined from the experimental data.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {12}
}