PSI - Issue 41

Muhammad Arif Husni Mubarok et al. / Procedia Structural Integrity 41 (2022) 282–289 Mubarok et al. / Structural Integrity Procedia 00 (2022) 000–000

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Solid plates as skin (top and bottom) with 6 mm thickness and cores with structural weight adjustment are joined using an eight-point Continuum-3D solid element with reduced integration (C3D8R). The explosion is also assumed to have occurred from a land mine located at a distance of 0.41 m directly on the surface of the underside of the hull. The mass of TNT that was detonated was 21 kg. In this study, the time period used by the researcher was 0.2 s. In this time, the plate passes through the elastic phase before the plate stabilizes and a permanent response or plastic phase occurs. The simulation was carried out by determining the weight of the TNT payload, the target distance to the center of the explosion, and the geometry of the sandwich panel surface. ConWep explosion simulation code can be used to calculate pressure distribution and impulse loading due to blast loads on sandwich panel surfaces.

Table 2. Comparison of Geometry Variation

Topology

Top View

3D View

Honeycomb

Stiffener

Corrugated

The simulated core compression process is shown in Figure 6, which shows that when a blast wave is applied to the bottom surface, the first buckling occurs on the underside (affected side), and the bevel bends towards the inner side. Figure 7 shows the displacement-time curves of the structure affected by the explosion. The highest deflection is located right in the center of the lower plate structure, which is closest to the blast source. However, the bevel near the top has remained almost in its original state. During the movement of the bottom face sheet, failure occurs at the bottom of the bevel, and the bevel near the top moves outward. Then the core bends from the center to the limit, and the compression gradually reaches a maximum. The dynamic global response of the core is then initiated. When the core reaches maximum deflection, the core will start to vibrate.