Localized Fiber Waviness and Implications for Failure in Unidirectional Composites

Finite element models with wavy material-orientation are used to represent periodic wavy fiber defects in composites. The homogenized material parameters in material coordinates (straight fiber properties) are determined originally by micromechanics modeling at the constituent level based on hexagonal fiber packing. To study the effects of local waviness, wavy material-orientation regions of material with different amplitude/wavelength ratios are embedded within regions of straight fiber material. A failure study has been performed for various types of localized fiber waviness. The modeling approach provides a systematic procedure to investigate the effects of fiber waviness defects on properties of unidirectional fiber composites.

[1]  H. Hoersch,et al.  Composite Materials: Fatigue and Fracture , 1986 .

[2]  Terry Gotch.  Composite materials — testing and design , 1990 .

[3]  Piggott,et al.  Fatigue failure processes in aligned carbon-epoxy laminates , 1991 .

[4]  B. BIJUIANSKY,et al.  COMPRESSIVE FAILURE OF FIBRE COMPOSITES , 2002 .

[5]  Daniel O. Adams,et al.  Interlaminar Strains and Compressive Strength Reductions Due to Nested Layer Waviness in Composite Laminates , 1998 .

[6]  Peter Joyce,et al.  A Technique for Characterizing Process-Induced Fiber Waviness in Unidirectional Composite Laminates-Using Optical Microscopy , 1997 .

[7]  Dimitris C. Lagoudas,et al.  Compressive Failure due to Kinking of Fibrous Composites , 1993 .

[8]  Andrew C. Hansen,et al.  Multicontinuum Failure Analysis of Composite Structural Laminates , 2001 .

[9]  Stephen W. Tsai,et al.  A General Theory of Strength for Anisotropic Materials , 1971 .

[10]  J. G. Davis,et al.  Compressive Strength of Fiber-Reinforced Composite Materials , 1975 .

[11]  A. Marques,et al.  A Micromechanical Model for the Prediction of the Lamina Longitudinal Compression Strength of Composite Laminates , 1997 .

[12]  Daniel O. Adams,et al.  Effects of layer waviness on the compression fatigue performance of thermoplastic composite laminates , 1994 .

[13]  Michael R Wisnom,et al.  Fibre Waviness Generation and Measurement and Its Effect on Compressive Strength , 2000 .

[14]  Howard M. Adelman,et al.  Evaluation of the Tensor Polynomial and Hoffman Strength Theories for Composite Materials , 1977 .

[15]  Z. Hashin.  Failure Criteria for Unidirectional Fiber Composites , 1980 .

[16]  T. Moon,et al.  Investigation of the Effect of Part Length on Process-Induced Fiber-Wrinkled Regions in Composite Laminates , 1997 .

[17]  Isaac M Daniel,et al.  EFFECT OF FIBER WAVINESS ON STIFFNESS AND STRENGTH REDUCTION OF UNIDIRECTIONAL COMPOSITES UNDER COMPRESSIVE LOADING , 1996 .

[18]  Frank T. Fisher,et al.  Fiber waviness in nanotube-reinforced polymer composites-I: Modulus predictions using effective nanotube properties , 2003 .

[19]  N. Fleck,et al.  Prediction of Kink Width in Compressed Fiber Composites , 1995 .

[20]  B. Harris,et al.  Compression strength of carbon, glass and Kevlar-49 fibre reinforced polyester resins , 1980 .

[21]  Isaac M Daniel,et al.  Effects of material and geometric nonlinearities on the tensile and compressive behavior of composite materials with fiber waviness , 2001 .

[22]  Alton L. Highsmith,et al.  The influence of fiber waviness on the compressive behavior of unidirectional continuous fiber composites , 1992 .

[23]  Ghodrat Karami,et al.  Finite Element Micromechanics for Stiffness and Strength of Wavy Fiber Composites , 2004 .

[24]  C. R. Chaplin,et al.  Compressive fracture in undirectional glass-reinforced plastics , 1977 .

[25]  Stelios Kyriakides,et al.  On the compressive failure of fiber reinforced composites , 1995 .

[26]  Ghodrat Karami,et al.  Effective moduli and failure considerations for composites with periodic fiber waviness , 2005 .

[27]  M. Piggott,et al.  Fiber Waviness and Other Mesostructures in Filament Wound Materials , 1997 .

[28]  John W. Gillespie,et al.  Influence of Ply Waviness on the Stiffness and Strength Reduction on Composite Laminates , 1992 .

[29]  M. Piggott,et al.  The effect of fibre waviness on the mechanical properties of unidirectional fibre composites: A review , 1995 .

[30]  Isaac M Daniel,et al.  Nonlinear Elastic Behavior of Unidirectional Composites With Fiber Waviness Under Compressive Loading , 1996 .