PSI - Issue 14

Shashidhar Naik H. G. et al. / Procedia Structural Integrity 14 (2019) 900–906 Shashidhar Naik H. G. et.al./ Structural Integrity Procedia 00 (2018) 000–000

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Figure 1. Meshing pattern of the specimen

2.1. Finite Element Modelling

The specimen was modelled as two separate plates, the Top and the Bottom. Delamination of varying diameters (from 10 mm to 100 mm) was introduced between the GFRP – Aluminium interface, such that thickness of the top plate is 0.65 mm and the bottom plate is 1.05 mm. Meshing was carried out to avoid triangular elements and the mesh size was finer at the delamination front to obtain accurate results. Circular delamination was introduced between the two plates using BNODES (Bond nodes), a special bonding node available in ABAQUS Standard. The interaction between the two plates was simulated by creating master and slave arrangements.

2.2. Loads and Constraints

The far end was fixed, and a compressive load in terms of initial displacement was applied at the near end. The remaining free edges were also constrained as shown in Figure 2. The load was kept constant, and the diameter of delamination was varied to study the initiation of crack propagation. A non-linear static analysis was carried out to compute SERR for all the diameters of delamination, considering B-K law as the decisive rule where the value of η was taken as 1.75 [Shubha et. al., (2018)].

Figure 2. Loads on boundary conditions applied