Intra-laminar cracking in CFRP laminates: observations and modelling
Matrix cracks in composite laminates are almost invariably the first damage mechanisms in composite laminates and are the precursor to more serious forms of damage. The results presented in this paper include experimental investigations into the occurrence of these cracks in a wide range of laminates containing various angle-plies. Ultrasonic detection of these cracks using polar backscattering is found to be successful and shows promise as a method which could be applied outside the laboratory. Further work includes finite element simulations which lead to an understanding of aspects of the accumulation of damage in composite laminates.
KeywordsComposite Laminate Crack Density Matrix Crack Strain Energy Release Rate CFRP Laminate
We are grateful to the EPSRC and dstl for funding of this work. It is a pleasure to acknowledge useful discussions with our collaborators from dstl, the National Physical Laboratory and QinetiQ.
- 1.Boniface L, Ogin SL, Smith PA (1991) In: O’Brien TK (ed) Composite materials: fatigue and fracture, vol 3. ASTM STP 1110, American Society for Testing and Materials, Philadelphia, p 9Google Scholar
- 3.Varna J, Berglund LA (1992) J Reinforced Plastics Composites 11:709Google Scholar
- 7.Shahid I, Chang F-K (1995) J Compos Mater 29:926Google Scholar
- 8.Sun CT, Chung I, (1993) J Compos Mater 24(8):619Google Scholar
- 9.Prickett AC (2001). Intralaminar cracking of fibre reinforced composites: a fracture mechanics and ToF-SIMS study. PhD thesis, University of SurreyGoogle Scholar
- 10.Bar-Cohen Y, Crane RL (1982), Mater Eval 40:970Google Scholar
- 11.Irwin GR (1958) Handbuch der Physik, Vol V. Springer-VerlagGoogle Scholar
- 13.Crocker LE (1998) Mixed-node intralaminar fracture in glass/epoxy laminates. PhD thesis, University of SurreyGoogle Scholar