PSI - Issue 33

Muhammad Sabiqulkhair Akbar et al. / Procedia Structural Integrity 33 (2021) 67–74 Akbar et al. / Structural Integrity Procedia 00 (2019) 000–000

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The study tested the midship section of a 120-meter container ship with a given static load, such as hydrostatic pressure and deadweight, and a dynamic load, which is hydrodynamic pressure from the sea to the midship structure, in this analysis. The design of the midship geometry uses the Solidworks, with dimensions in Fig 1. (a). The design of the 3D Midship is shown in Fig. 1. (b).

(a)

(b)

Fig. 1. (a) Geometry of the midship section; and (b) 3D model of the midship.

Element-length-to-thickness (ELT) ratio value is obtained by element size divided by the thickness of the geometry. The geometry of midship structure design that has been designed in the SolidWorks and ran the finite element analysis in SolidWorks Simulation, with different ELT ratios for each experiment (see Table 2). The ELT ratios of the simulation are starting from 5 to 11.

Table 2. Mesh size of the designed model. ELT Ratios

Thickness (mm)

Maximum Element Size (mm)

Nodes 138521 93057

Elements

5 6 7 8 9

100 100 100 100 100 100 100

500 600 700 800 900

70667 47686 38009 29184 23890 19191 15065

74016 56612 46044 36946 28757

10 11

1000 1100

It is important to equate the boundary condition and loading in midship structure (including material definition as presented in Table 3) to achieve outcomes that are comparable to benchmarking study. The static load is divided into deadweight 0.0535 MPa, and hydrostatic pressure (bottom shell 0.01 MPa; side shell 0.0075 MPa). The dynamic load is hydrodynamic pressure of 0.005786 MPa. The benchmarking journal used as a comparison has a limit in the form of displacement, strain, and stress (von-Mises). The results of the static structural analysis are the deformation plot, strain plot, and stress plot by Raja and Rajadurai (2018).

Table 3. Applied materials on the model. Material

ε (x 10 -4 )

Δ x (mm)

v-M (MPa)

σ

Titanium Alloy

27.86

6.082

142.9