PSI - Issue 27

Aknaf Sam Dabit et al. / Procedia Structural Integrity 27 (2020) 163–170 Dabit et al. / Structural Integrity Procedia 00 (2019) 000 – 000

167

5

Table 1. Characteristics of balsa wood.

Property

Value 2999.9 2999.9 159.9 0.29

Units

Elastic Modulus Poisson’s Ratio Shear Modulus Mass Density Yield Strength

N/mm 2

N/A

N/mm 2 kg/m 3 N/mm 2

19.9

From the above data, the simulation is carried out using the Finite Element Analysis (FEA) method with static loading. Meshing is a form of a grid or just the density between each material that forms material, the smaller the meshing value, the shape of the content on the part to be simulated will be better. In mathematics, grid or meshing is called the discretization process. We use the meshing method in the 3D mechanical design application by entering the mesh density parameter at a standard value (in the middle of the coarse and fine values). The grid forms an equilateral triangle, with a global size of 36.39 mm, and a tolerance value of 1.82 mm. The grid form can be seen in Fig. 5. This parameter is the minimum value to declare whether the results of static loading are safe or not. Meshing type in the simulation uses Solid Mesh type with the meshing value of the hull material will be shown in Table 2. Table 2. Meshing data from the catamaran hull.

Mesh type Mesher used Jacobian points Element size Tolerance Mesh quality Total nodes Total elements

Solid Mesh

Standard Mesh

4 point

36.3852 mm 1.81926 mm

High 18909 9840 79.103 0.0711

Maximum Aspect Ratio

Percentage of elements with Aspect Ratio < 3 Percentage of elements with Aspect Ratio > 10

80.4

% of distorted elements (Jacobian)

0

Fig. 5 shows the applied meshing on the catamaran hull. The catamaran hull meshing has 18909 nodes and 9840 elements, which also indicates the 79.103 maximum aspect ratio.

Fig. 5. Applied meshing on the catamaran hull.

4. Results and discussion The results of simulations on hulls and boat without crew for fish feeders with an autonomous system are stress, strain, and displacement values.