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L. Marsavina et alii, Frattura ed Integrità Strutturale, 34 (2015) 387-396; DOI: 10.3221/IGF-ESIS.34.43 396 [10] Burman, M., Fatigue crack initiation and propagation in sandwich structures, Report No.98-29, Stockholm (1998). [11] Poapongsakorn, P., Carlsson, L.A., Fracture toughness of closed-cell PVC foams: effect of loading configuation and cell size, Compos. Struct., 102 (2013) 1-8. [12] Hallstrom, S., Grenestedt, J.L., Mixed mode fracture of cracks and wedge shaped notches in expanded PVC foam, Int. J. Fract, 88 (1997) 343-358. [13] Noury, P.M., Shenoi R.A., Sinclair, I., On mixed-mode fracture of PVC foam, I J Fracture, 92 (1998) 131-151. [14] Marsavina, L., Constantinescu, D.M., Linul, E., Apostol, D.A., Voiconi, T., Sadowski, T., Refinements on fracture toughness of PUR foams, Eng. Fract. Mech., 129 (2014) 54-66. [15] Marsavina, L., Constantinescu, D.M., Linul, E., Voiconi, T., Apostol, D.A., Sadowski, T., Evaluation of mixed mode fracture for PUR foams, Procedia Materials Science, 3 (2014) 1342-1352. DOI:10.1016/j.mspro.2014.06.217. [16] Linul, E., Voiconi, T., Marsavina, L., Determination of mixed mode fracture toughness of PUR foams, Structural Integrity and Life, 14 (2014) 87-92. [17] Erdogan F., Sih G. C., On the crack extension in plates under plane loading and transverse shear, J Basic Engng, 85 (1963) 519-525. [18] Sih G. C., Strain-energy-density factor applied to mixed mode crack problems, I J Fract, 10 (1974) 305-321. [19] Hussain M. A., Pu S. L., Underwood J., Strain energy release rate for a crack under combined mode I and mode II. In: Fracture analysis, P.C. Paris, G.R. Irwin (Edts), ASTM STP560, Philadelphia, (1974) 2-28. [20] Richard H. A., Bruchvorhersagen bei uberlagreter normal- und schubbeanspruchung von rissen, VDI-Verlag, Dusseldorf, (1985). [21] Richard H. A., Fulland M., Sander M., Theoretical crack path prediction, Fatigue Fract Engng. Mater. Struct., 28 (2005) 3-12. [22] http://necumer.com/index.php/en/produkte-2/board-materials/modelling, (2014). [23] ASTM D1622-03 Test Method for Apparent Density of Rigid Cellular Plastics.

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