Issue 49

H. Chbani et alii, Frattura ed Integrità Strutturale, 49 (2019) 763-774; DOI: 10.3221/IGF-ESIS.49.68 774 [15] Shilang, X., Reinhardt, H.W. (1999) Determination of Double-K Criterion for Crack Propagation in Quasi-Brittle Materials, part I: experimental investigation of crack propagation, International Journal of Fracture, 98(2), pp. 111-149 DOI: 10.1023/A:1018668929989 [16] Shilang, X., Reinhardt, H.W. (1999) Determination of Double-K Criterion for Crack Propagation in Quasi-Brittle Materials, part II: Analytical Evaluating and Practical Measuring Methods for Three-Point Bending Notched Beams, International Journal of Fracture, 98(2), pp. 151-177. DOI: 10.1023/A:1018740728458 [17] ASTM international standard E399-72. Standard method of test for plane strain fracture toughness of metallic materials. (1972). [18] ASTM international standard E399-06. Standard test method for linear elastic method plane strain fracture toughness test KIc of metallic materials. (2006), pp. 1-32. [19] Tada, H., Paris, P.C., Irwin, G., (1985). The stress analysis of cracks handbook. St. Louis, MO, USA: Paris Productions Incorporated; [20] Chen, H.H., Su, R.K.L. (2013) .Tension softening curves of plain concrete, Construction and Building Materials 44, pp. 440-451, DOI: 10.1016/j.conbuildmat.2013.03.040