Issue 35

M. Bozkurt et alii, Frattura ed Integrità Strutturale, 35 (2016) 350-359; DOI: 10.3221/IGF-ESIS.35.40 358 Specimen No Crack Length (mm) Fracture Load P Q (N) KI KII KIII (MPa.m 1/2 ) (MPa.m 1/2 ) (MPa.m 1/2 ) Kv [1] (MPa.m 1/2 ) Kv [9] (MPa.m 1/2 ) P critical Predicted [1], (N) SIF values taken near free-surfaces 1 26.76 23384 11.52 4.39 6.77 16.00 15.99 18124 2 26.60 23816 11.48 4.25 6.77 15.89 15.88 18252 SIF values taken from midpoint 1 26.76 23384 12.07 0.00 7.74 15.85 15.85 18292 2 26.60 23816 12.02 0.00 7.72 15.79 15.79 18367 Maximum SIF values taken along the crack front 1 26.76 23384 12.07 4.39 7.74 17.09 17.09 16966 2 26.60 23816 12.02 4.25 7.72 16.96 16.95 17101 Table 3 : Comparisons with existing criteria for Mode-I/III test -  = 45 o , t = 25 mm. Specimen No Crack Length (mm) Fracture Load P Q (N) KI KII KIII (MPa.m 1/2 ) (MPa.m 1/2 ) (MPa.m 1/2 ) Kv [1] (MPa.m 1/2 ) Kv [9] (MPa.m 1/2 ) P critical Predicted [1], (N) SIF values taken near free-surfaces 3 25.66 10.957 21.77 12.99 15.31 34.32 34.29 8451 4 25.66 10879 21.77 12.99 15.31 34.32 34.29 8451 SIF values taken from midpoint 3 25.66 10.957 22.34 0.00 17.51 17.51 31.94 9079 4 25.66 10879 22.34 0.00 17.51 17.51 31.94 9079 Maximum SIF values taken along the crack front 3 25.66 10.957 22.34 12.97 17.51 36.81 36.78 7879 4 25.66 10879 22.34 12.97 17.51 36.81 36.78 7879 Table 4 : Comparisons with existing criteria for Mode-I/III test -  = 45 o , t = 12.5 mm. C ONCLUSIONS umerical and experimental studies for mode-I/III fracture were performed in this study. Numerical analyses of the mixed mode test system, which involved apparatus and a Compact Tension Tearing specimen, and mode- I/III fracture experiments were done. The computed stress intensity factors are used to compare predicted fracture loads with experiments using some of the existing criteria. Results showed that predicted fracture loads are somewhat reasonably close to experimental measurements, but opportunities exist to further refine the predictions in terms of modeling and criteria development. A CKNOWLEDGEMENTS he financial support by The Scientific and Technological Research Council of Turkey (TÜBİTAK) for this study under project no 113M407 is gratefully acknowledged. N T