Issue34

S. Keck et alii, Frattura ed Integrità Strutturale, 34 (2015) 371-378; DOI: 10.3221/IGF-ESIS.34.41 378 contained, the faster the crack path tends to grow in fibre direction. Here the ratio of the elasticity mismatch plays an important role. Also, as a first approach a formula for calculating the geometry correction factors for compact tension specimens where the fibre direction is perpendicular to the loading direction was described. The geometry correction factor functions for further fibre directions need to be developed. Therefore, it is necessary to consider the possibility to only modify the parameter concerning the length of the ligament. A CKNOWLEDGEMENT his publication has been partially funded with support from the European Union, the European Social Fund (ESF) and the Free State of Saxony. R EFERENCES [1] Dicker, M.P.M., Duckworth, P.F., Baker, A.A., Francois, G., Hazzard, M.K., Weaver, P.M., Green composites: A review of material attributes and complementary applications, Composites: Part A: Applied Science and Manufacturing, 56 (2014) 280–289. [2] ASTM Standard E647-13, Standard Test Method for Measurement of Fatigue Crack Growth Rates. American Society for Testing and Material, West Conshohocken, PA, (2013). [3] Richard, H.A., Fulland, M., Sander, M., Theoretical crack path prediction, Fatigue & Fracture of Engineering Materials and Structures, 28 (2015) 3–12. [4] Fulland, M., Steigemann, M., Richard, H.A., Specovius-Neugebauer, M., Development of stress intensities for cracks in FGMs with orientation perpendicular and parallel to the gradiation, Engineering Fracture Mechanics, 95 (2012) 37– 44. [5] Kuna, M., Finite Elements in Fracture Mechanics. Theory-Numerics-Applications, Springer, Heidelberg, (2013). DOI: 10.1007/978-94-007-6680-8. [6] Srawley, J.E., Wide range stress intensity factor expressions for ASTM E399 standard fracture toughness specimens, International Journal of Fracture, 12 (1976) 475. T