PSI - Issue 47

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Andreal Muhammad Naufal et al. / Procedia Structural Integrity 47 (2023) 133–141 Naufal et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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4. 1. Boundary condition Three-point bending modeling uses 3 cylinders arranged according to the position of the jig and load (Figure 5). The jig is illustrated using a cylinder with a finger of 3 mm (ASTM, 2007). In Fig. 6, cylinders marked with the letter (B) represent the jig, while the upper cylinder marked with the letter (A) is a stroke that puts pressure on the specimen. The boundary condition setting in letter B is given the ENCASTRE setting, which is U 1 = U 2 = U 3 = U R 1 = U R 2 = U R 3 =0. While cylinders marked with the letter A are given a displacement setting. The simulation environment is set so that the displacement occurs at 15 mm in the U 2 direction. The contact jig-specimen and stroke-specimen areas are given contact settings with a friction coefficient of 0.2.

Figure 5. Modeling of the boundary conditions.

4. 2. Configurations of the element discretization Meshing on two parts of the sandwich uses different seed sizes, in the facing section it has 6350 elements with a seed size of 1 mm (see Figure 6). Furthermore, the core uses a seed size of 2.25 mm with a total of 1630 elements. This mesh configuration is obtained from repeated experiments with various configurations and mesh convergence. The selection of this configuration is also based on the simulation time if it is too many elements it will take too much time to complete the simulation.

Figure 6. Mesh configuration in numerical simulation.