**3.6 Drawing of ship models**

Modeling a ship made in conditions of calm water (still wet) and wavy (waves), then modeling the behavior of water (calm and wavy water) by considering water

*Finite Element Method for Ship Composite-Based on Aluminum DOI: http://dx.doi.org/10.5772/intechopen.94973*


#### **Table 4.**

*Force weight on composite ship.*




*Finite Element Method for Ship Composite-Based on Aluminum DOI: http://dx.doi.org/10.5772/intechopen.94973*

**Table 5.**

*Force/weight on composite composite.*

as a series of linear-elastic springs (springs) that are not related to one another. In the depiction of this model ship, the number of springs 'fixed' is placed on the entire hull as shown in **Figure 5**. In the figure, the distance between the ivory (frame) with symbols **h** and **a** is the width of each section. So that the water surface area (wáter plan are/**Awl**) can be calculated by Eq. 4. The overall volume is the surface area of the water multiplied by the displacement / displacement of the water which is analogous to the distance (x) spring motion, shown in Eq. 4

$$Awl = h.a \tag{3}$$

$$V = Awl.a.x \tag{4}$$

So that the value of the spring constant (k) can be obtained from the spring force (Fs) shown in Eq. (5)

**Figure 5.** *Modeling of a series of springs on the hull.*

$$F\mathbf{s} = \mathbf{k}.\mathbf{x}\tag{5}$$

$$m\_{\mathbf{g}} = k \,\mathrm{x} \tag{6}$$

Given the density equation (ρ), is:

$$
\rho = \frac{m}{V} \tag{7}
$$

so that with the substitution of Eqs. (4), (5) and (6), the value of the spring constant is shown in Eq. (8):

$$k = Awl.\rho\_{\text{g}} \tag{8}$$

Information:


#### **3.7 Properties of material**

Determining the properties of the materials to be used is taken from all the composite stress mechanical test results data (EN AC-43100 (AlSi10Mg (b)) + SiC\*/15p) as numerical input modeling vessel, which are summarized in **Table 6**.


#### **Table 6.**

*Data for composite ship (EN AC-43100 (AlSi10Mg (b)) + SiC \*/15p).*
