Effect of Various Parameters on Effective Engineering Properties of 2 × 2 Braided Composites

Abstract Textile composites can be tailored to meet specific thermomechanical requirements for structural applications. Textile composites have good stiffness and strength properties; moreover, they have potentially better impact and fatigue resistance than laminated composites. Along with good properties, they have reduced manufacturing cost because much of the fabrication can be automated. To exploit these benefits, thorough understanding of the effect of various factors on their material behavior is necessary. Dominant forms of textiles are weaves, braids, and knits. The focus of this research is on 2 × 2 biaxial braided composites, which are considered a potential material for lightweight aircraft and have a wide variety of applications in the recreational, medical, and aerospace industries. Obtaining effective mechanical properties is the first order of concern in any structural analysis. This work presents an investigation of the effect of various parameters such as braid angle, waviness ratio, material properties, and cross-sectional shape on the effective engineering properties of the 2 × 2 braids. To achieve this goal, three-dimensional finite element micromechanics models were developed. Extensive parametric studies were conducted for two material systems: (1) glass fiber/epoxy matrix (S2/SC-15) and (2) carbon fiber/epoxy matrix (AS4/411-350). Equivalent laminated materials with angle plies and a resin layer were also analyzed to compare the difference in predictions from full three-dimensional finite element analyses of the 2 × 2 braided composites. The predictions are also compared with experimental results for a carbon/epoxy material system.

[1]  Adrian P. Mouritz,et al.  Review of applications for advanced three-dimensional fibre textile composites , 1999 .

[2]  Christopher M. Pastore,et al.  Mechanical properties of triaxially braided composites: experimental and analytical results , 1993 .

[3]  Joon-Hyung Byun,et al.  The analytical characterization of 2-D braided textile composites , 2000 .

[4]  A. Dasgupta,et al.  Orthotropic Thermal Conductivity of Plain-Weave Fabric Composites Using a Homogenization Technique , 1992 .

[5]  Grant P. Steven,et al.  Modelling for predicting the mechanical properties of textile composites : A review , 1997 .

[6]  P. Shembekar,et al.  Elastic Behavior of Woven Fabric Composites: I—Lamina Analysis , 1992 .

[7]  T. Chou,et al.  Elastic Stiffness of Three-Dimensional Braided Textile Structural Composites , 1986 .

[8]  C. Sun,et al.  Three-Dimensional Effective Elastic Constants for Thick Laminates , 1988 .

[9]  J. Whitcomb,et al.  Concise Derivation of Formulas for 3D Sublaminate Homogenization , 2000 .

[10]  Enrico D'Amato,et al.  Finite element modeling of textile composites , 2001 .

[11]  PERFORMANCE EVALUATION AND MODELING OF BRAIDED COMPOSITES , 2003 .

[12]  Donald M. Blackketter,et al.  Modeling Damage in a Plain Weave Fabric-Reinforced Composite Material , 1993 .

[13]  Johan Byström,et al.  An evaluation of different models for prediction of elastic properties of woven composites , 2000 .

[14]  Tsu-Wei Chou,et al.  Stiffness and strength behaviour of woven fabric composites , 1982 .

[15]  John D. Whitcomb,et al.  NASA National Aeronautics and , 1989 .

[16]  Xiaodong Tang,et al.  Effective Moduli of Woven Composites , 2001 .

[17]  John D. Whitcomb,et al.  General Techniques for Exploiting Periodicity and Symmetries in Micromechanics Analysis of Textile Composites , 2003 .

[18]  John D. Whitcomb,et al.  Derivation of Boundary Conditions for Micromechanics Analyses of Plain and Satin Weave Composites , 2000 .

[19]  Rajiv A. Naik,et al.  Failure Analysis of Woven and Braided Fabric Reinforced Composites , 1995 .

[20]  Tsu-Wei Chou,et al.  Fiber Inclination Model of Three-Dimensional Textile Structural Composites , 1986 .

[21]  P. Ifju,et al.  Effect of Fiber Architecture Parameters on Deformation Fields and Elastic Moduli of 2-D Braided Composites , 1994 .

[22]  B. N. Cox,et al.  Handbook of Analytical Methods for Textile Composites , 1997 .