40TH ANNIVERSARY higher the closer a ply was located to the centreline of the 2.C.KASTRITSEAS,P.A. SMITH andJ.A.YEOMANS,in face under investigation. At the same time, cracks in "Ceramic Matrix Composites: Microstructure-Property Relationship plies multiplied in number but remained surface features (Woodhead Publishing Ltd, ISBN 1 855735 9429,2006) while cracks in 90 plies increased moderately in length 3.Y. KAGAWA, N. KUROSAWA and T. KISHI, Mater Sci. (1993)735 M. J. BLISSETT, P. A. SMITH and J. A. YEOMANS, ibid. The effect that material dimensions have on the onset 32(1997)317. of thermal shock cracking and the extent of damage at 5.A.R. BOCCACCINI, D. H. PEARCE, J. JANCZAK, increasing shock severity were also highlighted. Thinner w. BEIER and C. B. PONTON, Mar Sci Tech. 13(1997)852. laminates exhibit higher resistance to thermal shock and 6. A. R. BOCCACCINI, J. JANCZAK-RUSCH, D. PEARCE and H. KERN, Comp. Sci Tech 59(1999)105 lower accumulation of thermal shock damage 7. A.R. BOCCACCINI, Scripta Mater. 38(8)(1998)1211 8. A.R. BOCCACCINI, H. KERN and I. DLOUHY, Mater. Sci. Eng.A308(1/2)(2001)111 YEOMANS financial support from the Engineering and Physical Sc 37(1)(2003)73 ences Research Council (UK)and the 'Alexander S Onas- 11. H. WANG, R. N. SINGH and R.A. LoWDEN,.Am. ceram is' Public Benefit Foundation. The help of Mr. Mike Soc.79(7)(1996)1783 Parker and Mr Nick Ludford with specimen preparation 12. J. E. WEBB,R. N. SINGH and R. A LOWDEN, ibid. 79(m) is gratefully acknowledged (1996)2857 13. Y. KAGAWA, Comp. Sci Tech 57(1997)607. 14. M. J. BLISSETT, P. A. SMITH and J. A. YEOMANS, J Mater.Sci.33(198)4181 References 15. H. WANG, R. N. SINGH andR. A. LOWDEN, ibid. 32(1997) L H. WANG and R. N. SINGH, Int. Mat. Rev. 39(1994) 3305 16. A. W. PRYCE and P. A. SMITH, ibid. 27(1992)2695.40TH ANNIVERSARY higher the closer a ply was located to the centreline of the face under investigation. At the same time, cracks in 0◦ plies multiplied in number but remained surface features while cracks in 90◦ plies increased moderately in length but significantly in depth. The effect that material dimensions have on the onset of thermal shock cracking and the extent of damage at increasing shock severity were also highlighted. Thinner laminates exhibit higher resistance to thermal shock and lower accumulation of thermal shock damage. Acknowledgments The authors would like to thank Rolls-Royce plc. for the provision of experimental materials. CK acknowledges financial support from the Engineering and Physical Sci￾ences Research Council (UK) and the ‘Alexander S. Onas￾sis’ Public Benefit Foundation. The help of Mr. Mike Parker and Mr. Nick Ludford with specimen preparation is gratefully acknowledged. References 1. H. WANG and R. N. SINGH, Int. Mat. Rev. 39 (1994) 228. 2. C. KASTRITSEAS , P. A. SMITH and J. A. YEOMANS , in “Ceramic Matrix Composites: Microstructure-Property Relationship” (Woodhead Publishing Ltd., ISBN 1 85573 942 9, 2006). 3. Y. KAGAWA, N. KUROSAWA and T. KISHI, J. Mater. Sci. 28 (1993) 735. 4. M. J. BLISSETT, P. A. SMITH and J. A. YEOMANS , ibid. 32 (1997) 317. 5. A. R. BOCCACCINI, D. H. PEARCE, J. JANCZAK, W. BEIER and C. B. PONTON, Mat. Sci. Tech. 13 (1997) 852. 6. A. R. BOCCACCINI, J. JANCZAK-RUSCH, D. H. PEARCE and H. KERN, Comp. Sci. Tech. 59 (1999) 105. 7. A. R. BOCCACCINI, Scripta Mater. 38(8) (1998) 1211. 8. A. R. BOCCACCINI, H. KERN and I. DLOUHY, Mater. Sci. Eng. A308 (1/2) (2001) 111. 9. C. KASTRITSEAS , P. A. SMITH and J. A. YEOMANS , Comp. Sci. Eng. 65(11/12) (2005) 1880. 10. S . GRAHAM, D. L. MCDOWELL, E. LARA-CURZIO, R. B. DINWIDDIE, H. WANG and W. PORTER, J. Comp. Mater. 37(1) (2003) 73. 11. H. WANG, R. N. SINGH and R. A. LOWDEN, J. Am. Ceram. Soc. 79(7) (1996) 1783. 12. J. E. WEBB, R. N. SINGH and R. A. LOWDEN, ibid. 79(11) (1996) 2857. 13. Y. KAGAWA, Comp. Sci. Tech. 57 (1997) 607. 14. M. J. BLISSETT, P. A. SMITH and J. A. YEOMANS , J. Mater. Sci. 33 (1998) 4181. 15. H. WANG, R. N. SINGH and R. A. LOWDEN, ibid. 32 (1997) 3305. 16. A. W. PRYCE and P. A. SMITH, ibid. 27 (1992) 2695. 962