PSI - Issue 47

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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Figure 8. Results of the laboratory testing: deformation on the sandwich specimen.

Figure 9. Results of the numerical simulation: stress contours.

5.2. Mesh convergence study. A mesh convergence study was conducted to determine an appropriate configuration when performing numerical simulation. This step is important to know the optimal configuration when performing numerical analysis. Mesh convergent is done by changing the mesh configuration on the facing part. By changing the mesh configuration Maximum point load will also change. After conducting nine numerical simulations with different mesh configurations ranging between 2.5 mm to 0.5 mm, a logarithmic curve was obtained as presented in Figure 10. It can be seen that the greater the number of elements, the smaller the maximum point load. At seed sizes of 2.5 mm to 1 mm, there is a significant change in yield at the maximum point load result, when the seed size touches the number of 1 mm to 0.5 mm the curve begins to flatten from this result, and it can be seen that convergent has been obtained. From this study, we conclude that the best mesh configuration that is good to use in the next study is 1 mm with a total of 6350 elements. This size was chosen because the results obtained are quite accurate, when compared to the size of 0.5 or 0.75 mm, the results are not significantly different. In addition, a size of 1 mm has the least number of elements among the three sizes. The number of elements becomes important when doing numerical simulation because the greater the number of elements, the longer it will take to complete numerical simulation