On the Behavior of Composite Laminates After Initial Failures

Bilinear stress-strain relation of symmetric, [0/90] composite laminates is shown to be associated with gradual, not complete, degradation of 90° layers. Difference between the complete failure model and gradual failure model is discussed, complemented by pertinent experimental evidences. Experimental data on glass/epoxy and graphite/epoxy cross-ply laminates are compared with the theoretical predictions. The effect of strain biaxiality on failure of 90° layers is shown to be negligible when the laminate is subjected only to a uniaxial tension.

[1]  G. Sendeckyj,et al.  Fracture Behavior of Thornel 300/5208 Graphite-Epoxy Laminates—Part 1: Unnotched Laminates , 1975 .

[2]  S. Tsai,et al.  An Alternate Graphical Representation of Failure Surface. , 1974 .

[3]  R. Sandhu.  Nonlinear response of unidirectional and angle ply laminates , 1974 .

[4]  D. Adams.  Elastoplastic Crack Propagation in a Transversely Loaded Unidirectional Composite , 1974 .

[5]  Raymond L. Foye,et al.  Theoretical Post-Yielding Behavior of Composite Laminates Part II-Inelastic Macromechanics , 1973 .

[6]  R. Foye.  Theoretical Post-Yielding Behavior of Composite Laminates Part I—Inelastic Micromechanics , 1973 .

[7]  H. T. Hahn,et al.  Nonlinear Behavior of Laminated Composites , 1973 .

[8]  Stephen W. Tsai,et al.  Nonlinear Elastic Behavior of Unidirectional Composite Laminae , 1973 .

[9]  Edward M. Wu,et al.  Optimal Experimental Measurements of Anisotropic Failure Tensors , 1972 .

[10]  G. K. Wolfe,et al.  An Experimental Investigation of the Stress Levels at Which Significant Damage Occurs in Graphite Fiber Plastic Composites. , 1972 .

[11]  John C. Halpin,et al.  Structure-Property Relations and Reliability Concepts , 1972 .

[12]  I. Kalnin.  Evaluation of Unidirectional Glass-Graphite Fiber/Epoxy Resin Composites , 1972 .

[13]  R. Sandhu,et al.  A Survey of Failure Theories of Isotropic and Anisotropic Materials , 1972 .

[14]  R. Crane,et al.  A Graphical Representation of the Failure Surface of a Composite , 1971 .

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

[16]  Donald F. Adams,et al.  Inelastic Analysis of a Unidirectional Composite Subjected to Transverse Normal Loading , 1970 .

[17]  M. E. Waddoups,et al.  A Method of Predicting the Nonlinear Behavior of Laminated Composites , 1969 .

[18]  R. Shlitsa.  Deformation characteristics of glass-reinforced plastics in tension , 1969 .

[19]  Stephen W. Tsai,et al.  Strength Characteristics of Composite Materials. , 1965 .

[20]  G. F. Smith.  On the yield condition for anisotropic materials , 1962 .