PSI - Issue 47

Sergio Arrieta et al. / Procedia Structural Integrity 47 (2023) 13–21 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 4. Experimental setup of one of the experiments. U-notch, notch radius 0.9 mm, thickness 10 mm.

Once σ max is obtained, the external load causing this maximum stress at the notch tip may be easily derived by using analytical expressions of the stress field, such as the Creager-Paris equation (Creager and Paris (1967)): =   √ ∙     / (9) with K I being the applied stress intensity factor, r being the distance from the notch tip and ρ being the notch radius. Given that σ max takes place at r=0:   = ·   (10) Equation (10) provides the K I value at fracture conditions. Finally, using the recognized analytical solution of K I for single edge notched tensile (SENT) panel (equation (11), Anderson (2012)), the values of the predicted critical loads (P ASED ) can be derived:   =   √  ∙  2· 2    2    0.752 + 2.02     +0.37  1− 2     3  (11) where a, B, and W denote the defect length, the specimen thickness and the specimen width, respectively.