PSI - Issue 13

S. Lindqvist et al. / Procedia Structural Integrity 13 (2018) 1195–1200 S. Lindqvist/ Structural Integrity Procedia 00 (2018) 000–000

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Fig. 6. a) Comparison of the tearing resistance of the DMW determined at 1 mm of crack growth, J 1mm , and obtained with SE(T) and SE(B) specimens. The J-R curves have typically a shape determined by J 1mm ∙ Δa m . b ) The m-exponent depends on crack location and appears to be insensitive of constraint.

Fig. 7. a) T-stress as a function of a/W. b) The accuracy of the constraint correction for tearing resistance is of the order of 20 % (Wallin 2011). The yield strength of the HAZ was determined with 1 mm thick specimens. Noticeably, the strength varies drastically in the HAZ and it can be difficult to determine the yield strength of a particular zone (Hänninen et al. 2014). References Graba, M., 2013. Numerical verification of the limit load solutions for single edge notch specimen in tension. Archives of Civil and Mechanical Engineering, 13, 45–56. Huang, Y., Zhou, W., 2015. Numerical investigation of compliance equations used in the R-curve testing for clamped SE(T) specimens. Fatigue and Fracture of Engineering Materials & Structures, 38, 1137–1154. Hänninen, H., Brederholm, A., Sarikka, T., et al., 2014. Structural Integrity of Ni-base Alloy Welds. Espoo. Lindqvist, S., Sarikka, T., Ahonen, M., Hänninen, H., 2018. The effect of crack path on tearing resistance of a narrow-gap Alloy 52 dissimilar metal weld. Engineering Fracture Mechanics. Mathias, L., Sarzosa, D., Ruggieri, C., 2013. Effects of specimen geometry and loading mode on crack growth resistance curves of a high-strength pipeline girth weld. International Journal of Pressure Vessel and Piping, 111–112, 106–119. Wallin, K., 2011. Fracture toughness of engineering materials - estimation and application. EMAS publishing .