High modulus carbon fibre composites: Correlation between transverse tensile and mode I interlaminar fracture properties

This paper presents test results from mode I interlaminar fracture and transverse tensile tests on unidirectional carbon/epoxy composites used in racing yacht construction. Fibre modulus has been varied from 380 to 640 GPa. PAN fibre reinforced composite properties, delamination resistance (GIc and GIp) and transverse strain to failure, decrease as fibre modulus increases. Composites based on the highest modulus pitch fibres show higher transverse failure strains than the highest modulus PAN fibre composites. A distinct failure mechanism, crack propagation within the fibres, was observed for the pitch based reinforcement. The transverse tensile tests allowed transverse fibre modulus to be estimated as 11.5 GPa for the PAN and 9 GPa for the pitch fibres. These results indicate that more detailed study is needed if pitch based composites are to be optimised.

[1]  Tove Jacobsen,et al.  Large scale bridging in compos-ites: R-curve and bridging laws , 1998 .

[2]  John B. Shoven,et al.  I , Edinburgh Medical and Surgical Journal.

[3]  T. Peijs,et al.  Deformation, yield and fracture of unidirectional composites in transverse loading: 2. Influence of fibre–matrix adhesion , 1999 .

[4]  Andrei A. Gusev,et al.  Fiber packing and elastic properties of a transversely random unidirectional glass/epoxy composite , 2000 .

[5]  J. P. Berry.  Determination of Fracture Surface Energies by the Cleavage Technique , 1963 .

[6]  C. Sato,et al.  Comparison of experimental and theoretical transverse elastic modulus of carbon fibers , 2006 .

[7]  Measurement of transverse Young's modulus of fibers by angular characteristics of ultrasonic scattering , 1991 .

[8]  K. Benzarti,et al.  Transverse properties of unidirectional glass/epoxy composites: influence of fibre surface treatments , 2001 .

[9]  Naoki Yamada,et al.  j soc mater sci jpn , 1975 .

[10]  T. Peijs,et al.  Characterization of interphase conditions in composite materials , 1996 .

[11]  S. Keusch,et al.  Influence of surface treatment of glass fibres on the dynamic mechanical properties of epoxy resin composites , 1999 .

[12]  Klaus Friedrich,et al.  Application of fracture mechanics to composite materials , 1989 .

[13]  L. P. Kobets,et al.  Carbon fibres: structure and mechanical properties , 1998 .

[14]  J. C. H. Affdl,et al.  The Halpin-Tsai Equations: A Review , 1976 .

[15]  M. Chiang,et al.  (Polymer Engineering and Science, 45(12):1615-1621)Fabrication and characterization of biodegradable poly(lactic acid)/layered silicate nanocomposites , 2005 .