PSI - Issue 39

M.R.M. Aliha et al. / Procedia Structural Integrity 39 (2022) 393–402 Author name / Structural Integrity Procedia 00 (2021) 000–000

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Fig. 2. Surface-based cohesive behaviour [18].

4. Finite element (FE) model of BI-SBB specimen 4.1. Based on the J-integral method

It is assumed that the inclined crack is initiated in the adhesive part that behaves as a linear elastic material. Therefore, by using J integral method, the fracture parameters can be calculated in the ABAQUS code [7]. Based on Reference ([7]), the fracture parameters of the BI-SBB specimen are written as equation (6). = √ � � . � . � = I. II (6) In which Y I and Y II are the geometry factors corresponding to K I and K II , respectively. These geometry factors are functions of crack length ratio ( a/W ), loading span ratio ( S/W ) and crack inclination angle (α) in the BI-SBB specimen. In Figure 3, the finite element model of the BI-SBB specimen based on the J-integral method created in the ABAQUS code is shown. 4600 CPE8 (i.e. 8-node biquadratic plane strain quadrilateral) elements were employed in total. It is noteworthy the authors used the same finite element modeling to evaluate homogeneous short bend beam specimen [19-21]. So it is expected framework of Linear elastic fracture mechanics (LEFM) would be relevant and appropriate for evaluating the fracture behavior of the BI-SBB specimen.

Fig. 3. Finite element model of BI-SBB specimen based on J-Integral method.