Issue 11

D. Taylor, Frattura ed Integrità Strutturale, 11 (2009) 3-9; DOI: 10.3221/IGF-ESIS.11.01 9 2) We can, however, expect that L will change with notch size and other aspects of specimen geometry, if this causes changes in constraint or if the process zone size is a significant proportion of the remaining ligament. 3) Despite these changes, the assumption of a constant value of L leads to only small errors in the prediction of fracture stress in long-fibre composite laminate materials, so this approach is recommended for engineering applications. R EFERENCES [1] H. Neuber, Theory of notch stresses: principles for exact calculation of strength with reference to structural form and material, 2 ed., Springer Verlag, Berlin, (1958) 292. [2] R. E.Peterson, in: Metal Fatigue, edited by G. Sines and J. L. Waisman McGraw Hill, New York, (1959) 293. [3] J.M. Whitney, Nuismer, R. J., "Stress fracture criteria for laminated composites containing stress concentrations," Journal of Composite Materials, Vol. 8, 1974, pp. 253-265. [4] D. Leguillon, European Journal of Mechanics A/Solids, 21 (2002) 61. [5] P. Cornetti, N. Pugno, A. Carpinteri, D. Taylor, Engineering Fracture Mechanics, 73(14) (2006) 2021. [6] D. Taylor, Engineering Fracture Mechanics, 75 (2008) 1696. [7] D. Taylor, The Theory of Critical Distances: A New Perspective in Fracture Mechanics, Elsevier, Oxford, UK, (2007). [8] J.M. Whitney, I.M. Daniel, R.B. Pipes, Experimental Mechanics of Fiber Reinforced Composite Materials, Society for Experimental Stress Analysis, Connecticut (1982). [9] J. Awerbuch, M.S. Madhukar, Journal of Reinforced Plastics and Composites, 4 (1985) 3. [10] R.C. Wetherhold, M.A. Mahmoud, Materials Science and Engineering, 79 (1986) pp. 55. [11] R.F. Karlak, in: Proceedings of failure modes in composites IV, The metallurgical society of AIME, Chicago (1977) 105. [12] R.B. Pipes, R.C. Wetherhold, J.W. Gillespie, Journal of Composite Materials, 12 (1979) 148. [13] T.C. Kennedy, M.H. Cho, M.E. Kassner, Composites Part A, 33 (2002) 583. [14] D. Taylor, Structural Integrity and Durability, 1 (2006) 145.