Residual Stresses in Carbon Fibre-Thermoplastic Matrix Laminates

Residual stresses in composite laminates depend on thermoelastic properties of the material and processing temperatures. Their distribution in the various laminae is a func tion of stacking sequence and ply orientation. In this work residual stresses in APC-2 cross-ply laminates have been investigated. Predictions based on classical laminate theory are compared to measured levels of residual stress obtained from a number of experimen tal techniques. The analysis of the results shows that accurate predictions can be made pro vided that the changes in thermoelastic properties of the materials with temperature are taken into account.

[1]  J. E. Bailey,et al.  Constrained cracking in glass fibre-reinforced epoxy cross-ply laminates , 1978 .

[2]  A. Maradudin,et al.  An Introduction To Applied Anisotropic Elasticity , 1961 .

[3]  J. E. Bailey,et al.  Multiple transverse fracture in 90° cross-ply laminates of a glass fibre-reinforced polyester , 1977 .

[4]  I. Daniel,et al.  MEASUREMENT OF LAMINATION RESIDUAL STRAINS IN GRAPHITE FIBER LAMINATES. , 1976 .

[5]  D. J. Blundell,et al.  Crystalline morphology of the matrix of PEEK-carbon fiber aromatic polymer composites. II. Crystallization behavior , 1985 .

[6]  Isaac M Daniel,et al.  Effect of laminate construction on residual stresses in graphite/polyimide composites , 1977 .

[7]  N. Pagano,et al.  Curing Stresses in Composite Laminates , 1975 .

[8]  Michael W. Hyer,et al.  The Room-Temperature Shapes of Four-Layer Unsymmetric Cross-Ply Laminates , 1982 .

[9]  F. Cogswell,et al.  Environmental resistance of carbon fibre-reinforced polyether etherketone , 1983 .

[10]  Richard Schapery.  Thermal Expansion Coefficients of Composite Materials Based on Energy Principles , 1968 .

[11]  H. Thomas Hahn,et al.  Residual Stresses in Polymer Matrix Composite Laminates , 1976 .

[12]  F. Cogswell.  Continuous Fibre Reinforced Thermoplastics , 1986 .

[13]  H. Hahn,et al.  Effect of Curing Stresses on the First Ply-failure in Composite Laminates , 1979 .

[14]  M. Kural,et al.  Experimental Determination of the In Situ Transverse Lamina Strength in Graphite/Epoxy Laminates , 1982 .

[15]  Michael W. Hyer,et al.  Calculations of the Room-Temperature Shapes of Unsymmetric Laminatestwo , 1981 .

[16]  T. Liber,et al.  Lamination residual stresses in fiber composites , 1973 .

[17]  J. Nairn,et al.  The Development of Residual Thermal Stresses in Amorphous and Semicrystalline Thermoplastic Matrix Composites , 1987 .