PSI - Issue 2_B

L. Pittarello et al. / Procedia Structural Integrity 2 (2016) 1829–1836 Author name / Structural Integrity Procedia 00 (2016) 000 – 000

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mode loading. The second method, presented by Treifi and Oyadiji, overcomes this problem considering the strain energy density averaged within two control volumes (semi-circular sector) centred at the notch tip. Then a method based on the evaluation of the total and deviatoric strain energy density has been proposed. The described methods have been applied to plates subjected to mixed mode I+II loading and weakened by different V-notch geometries. The values of the NSIFs derived according to Gross and Mendelson have been compared with those obtained by means of the approximate methods taking into consideration three different values of the control radius 0 (0.1, 0.01 and 0.001 mm) and by using coarse FE meshes. The comparison of the results show that the new proposed method provides the best combination between the degree of approximation and the level of applicability, so it could be useful for rapid calculation of the NSIFs. References Atzori, B., Meneghetti, G. , 2001. Fatigue strength of fillet welded structural steels: Finite elements, strain gauges and reality. International Journal of Fatigue, 23(8), 713 – 721. Berto, F., Campagnolo, A., Gallo, P. , 2015. Brittle Failure of Graphite Weakened by V-Notches: A Review of Some Recent Results Under Different Loading Modes. Strength of Materials, 47(3), 488 – 506. Berto, F., Lazzarin, P. , 2014. Recent developments in brittle and quasi-brittle failure assessment of engineering materials by means of local approaches. Materials Science & Engineering R, 75(1), 1 – 48. Berto, F., Campagnolo, A., Chebat, F., Cincera, M., Santini, M. , 2016. Fatigue strength of steel rollers with failure occurring at the weld root based on the local strain energy values: modelling and fatigue assessment. International Journal of Fatigue, 82, 643 – 657. Boukharouba, T., Tamine, T., Niu, L., Chehimi, C., Pluvinage, G. , 1995. The use of notch stress intensity factor as a fatigue crack initiation parameter. Engineering Fracture Mechanics, 52(3), 503 – 512. Campagnolo, A., Berto, F., Leguillon, D. , 2016. Fracture assessment of sharp V-notched components under Mode II loading: a comparison among some recent criteria. Theoretical and Applied Fracture Mechanics. doi:10.1016/j.tafmec.2016.02.001 Campagnolo, A., Berto, F., Pittarello, L. , 2016. Strain energy density-based evaluation of the NSIFs under mixed mode I+II loading. Structural Durability and Health Monitoring. (in press) Gross, B., Mendelson, A. , 1972. Plane elastostatic analysis of V-notched plates. International Journal of Fracture Mechanics, 8(3), 267 – 276. Lazzarin, P., Tovo, R. , 1998. A notch intensity factor approach to the stress analysis of welds. Fatigue and Fracture of Engineering Materials and Structures, 21(9), 1089 – 1103. Lazzarin, P., Zambardi, R. , 2001. A finite-volume-energy based approach to predict the static and fatigue behavior of components with sharp V-shaped notches. International Journal of Fracture, 112(3), 275 – 298. Lazzarin, P., Berto, F., Zappalorto, M. , 2010. Rapid calculations of notch stress intensity factors based on averaged strain energy density from coarse meshes: Theoretical bases and applications. International Journal of Fatigue, 32(10), 1559 – 1567. Livieri, P., Lazzarin, P. , 2005. Fatigue strength of steel and aluminium welded joints based on generalised stress intensity factors and local strain energy values. International Journal of Fracture, 133(3), 247 – 276. Seweryn, A. , 1994. Brittle fracture criterion for structures with sharp notches. Engineering Fracture Mechanics, 47(5), 673 – 681. Torabi, A. R., Campagnolo, A., Berto, F. , 2015. Tensile fracture analysis of V-notches with end holes by means of the local energy. Physical Mesomechanics, 18(3), 194 – 202. Treifi, M., Oyadiji, S. O. , 2013. Strain energy approach to compute stress intensity factors for isotropic homogeneous and bi-material V-notches. International Journal of Solids and Structures, 50(14-15), 2196 – 2212. Williams, M. L. , 1952. Stress singularities resulting from various boundary conditions in angular corners on plates in extension. Journal of Applied Mechanics, 19, 526 – 528.