**4.1 Result loads of wave induced** *(Quasi Static)*

Summary results of the calculation of wave loads induced (quasi static) in **Table 8** while the chart figure of wave induce in condition hogging and sagging shown in **Figure 6** condition S.F.W.V, **Figure 7** for B.M.W.V and **Figure 8** condition for wave induced stress.

**Figures 9** and **10** show the distribution of stress in the composite ship numerical model EN AC43100 (AlSi10Mg(b) + SiC\*/15p) for water and wave condition induced for the entire ship body, and the plate thickness of 6 mm was used.The maximum stress occurring in composite ship numeric models is 7.24 MPa. While the maximum stress that occurs in numerical composite ship models for the conditions induced by the wave is 14.1 MPa.

Ship numerical model for base (bottom) construction, shown in **Figure 11** for still water condition and **Figure 12** for wave-induced condition. The maximum stress in numerical composite ship models, when still water conditions are 7.24 MPa. While the maximum stress that occurs in numerical composite ship models reaches 19.1 MPa for the wave induced conditions.

Distribution of stress in main deck on **Figure 13** for still water condition and **Figure 14** for wave induced condition. The maximum stress that occurs in numerical models of composite ship when conditions still water is 6.67 MPa. While for the


#### **Table 8.**

*The calculation of wave loads induced (quasi static).*

**Figure 6.** *Condition S.F.W.V.*

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

**Figure 7.** *Condition M.B.W.V.*

**Figure 8.** *Condition for wave induced stress.*

#### **Figure 9.**

*Distribution of stress in model of numerical of ship composite EN AC-43100 (AlSi10Mg (b)) + SiC\*/15p for the full ship body for condition still water (maximum stress = 7,24 MPa).*

wave induced conditions, the maximum stress that occurs in numerical models of composite ship of 16.8 MPa.

Overall the above results are summarized in **Table 9**. From the results of the stress distribution shows that the maximum stress that occurs in induced wave conditions have higher value compared to still water conditions. This is because the load is included in the wave induced more numerous and complex than a given load on the still water. Composite ship (EN AC-43100 (AlSi10Mg (b)) + SiC\*/15p), more weight than aluminum ship because in composite ship there have SiC as reinforcement, which causes the composite more heavier than the aluminum ship (for the same thickness = 6 mm). Conversely, aluminum ship lighter, so it automatically receives the maximum stress is greater than that received by a composite ship, for input the same load and the plate of the same thickness.

#### **Figure 10.**

*Distribution of stress in model of numerical of shicomposite EN AC-43100 (AlSi10Mg (b)) + SiC\*/15p for full ship body for wave induced condition (maximum stress = 14,1 MPa).*

#### **Figure 11.**

*Distribution of stress in model of numerical of ship composite EN AC-43100 (AlSi10Mg (b)) + SiC\*/15p for the hull and construction of the base (bottom) for still wave condition (maximum stress = 7,42 MPa).*

#### **Figure 12.**

*Distribution of stress in model of numerical of ship composite EN AC-43100 (AlSi10Mg (b)) + SiC\*/15p for the hull and construction of the base (bottom) for wave induced condition (maximum stress = 19,1 MPa).*

**Table 9** shows the maximum stress that occurs in composite ship more smaller than the ship of aluminum, this happens because the weight of ship of composite is heavier than ship of aluminum. So that when receiving weight distribution uniform, ship of composite are stronger hold so the impact on the value of the stress maximum is smaller. It seems that all the results obtained showed the maximum stress

#### **Figure 13.**

*Distribution of stress in model of numerical of ship composite EN AC-43100 (AlSi10Mg (b) + SiC\*/15p for* main deck *for still water condition (maximum stress = 6.67 MPa).*

#### **Figure 14.**

*Distribution of stress in model of numerical of ship composite EN AC-43100 (AlSi10Mg (b)) + SiC\*/15p for* main deck *for wave induced condition (maximum stress = 16.8 MPa).*


#### **Table 9.**

*Value of máximum stress of model of numerical of aluminum ships and the ship of composite.*

does not exceed the value of the stress permits (0.2 sigma = 59.30 MPa) for composite materials. This means that composite materials EN AC-43100 (AlSi10Mg (b)) + SiC \*/15p) can be used throughout the full of body ship. This condition is amplified by a factor of safety which is the ratio between the material strength with strength design, where material strength is the stress permits (sigma 0.2) and the design strength is the maximum stress from the program ANSYS (FEM calculation). Factor of safety more than to 1. Factor of safety values are shown in **Table 10** indicated that the factor of safety for all conditions in still water and wave induced, has value above 1.00, so the overall material composite EN AC-43100 (AlSi10Mg (b) + SiC\*/15p is safe to use.
