**4.2 Application analysis of modeling composite ship EN AC-AlSi10Mg (b) + SiC\*/15p**

Furthermore with using ANSYS software version 12.0, this research will analyze the application of composite materials EN AC-AlSi10Mg (b) + SiC\*/15p that can use in ship building. Overall composite ship modeling EN AC 43100(AlSi10Mg (b)) + SiC\*/15p), shows that the stress does not exceed the value limit stress 0.2 sigma. It means that this material can actually be applied to the entire body of the ship. But because it is brittle, then the selection of applications on the ship also should look at the nature of this material. Selected applications on top of the building wall (superstructure) that the wall plate height (h) = 2.2 meters and width (b) = 1.5, composite thick ship plate is 5 mm (**Figure 15**) and building applications on the deck plate (superstructure decks) on the size of 1 m x 1 m and thickness of 6 mm (**Figure 16**).

The maximum stress that occurs in ship composite EN AC 43100(AlSi10Mg (b)) + SiC\*/15p) for building walls on the plate thickness 5 mm at 9.43 MPa and the deck superstructure with plate thickness 6 mm to obtain the wave-induced stress conditions maximum 10.7 MPa. Both of these results when compared with aluminum ship for the two applications (on the wall of the building) with the height and width the same, but with a thickness of 5 mm, the maximum stress value will be 9.26 MPa (**Figure 17**) and for the superstructure deck of the same size but the greater thickness of 7 mm is obtained at 10.8 MPa maximum stress (**Figure 18**). It means that the results obtained by the maximum strees between the composite ship


**Table 10.** *Value factor of safety.*

#### **Figure 15.**

*Distribution stress of composite shipEN AC 43100(AlSi10Mg(b)) + SiC\*/15p) in superstructure wall with plate thick 5 mm (max. Stress =9.43 MPa).*

#### **Figure 16.**

*Distribution stress of composite ship EN AC 43100(AlSi10Mg(b)) + SiC\*/15p) on superstructure deck with plate thick 6 mm for induced wave condition (max. Stress = 10.7 MPa).*

with aluminum ship are not a significant difference, in fact it can be said the maximum stress value approaching the same value.

Actually the main core of ship composite EN AC43100(AlSi10Mg(b)) + SiC\*/15p) as an alternative material for building ships with reduced thickness is used in the composite material will impact on the weight loss, heavy displacement ship will be reduced, then for the length, width, and height of the vessel remains, laden vessel will be reduced. With a large reduction in the laden ship, the wetted surface area / WSA of the hull is submerged in water will also be reduced. This will reduce the size of the total water barriers experienced by vessels which in turn thrust (powering) ship engine fixed, it will increase the speed of the ship. Or conversely, if the desired speed of the ship is made permanent, this will lower the powering of the vessel and it will certainly reduce the relatively large ship main engine. So in general can decrease the volume of the cylinder marine engine. Thus the fuel consumption becomes smaller, thus making the vessel operating expenses generally become more efficient.

#### **Figure 17.**

*Distribution stress of ship aluminum EN AC-43100(AlSi10Mg(b)) with plate thick 6 mm (max. Stress = 9.26 MPa).*

#### **Figure 18.**

*Distribution stress of ship aluminum EN AC-43100(AlSi10Mg(b)) on superstructure deck with plate thick 7 mm for induced wave condition (max. Stress = 10.8 MPa).*
