Model Structural Support SCENARIO 1

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5.3 LIMITATION OF THE RAPID PROTOTYPING MACHINE

The machine which is used to produce the product is the Fused Deposition Modeling FDM machine. Material that used on this machine is Acrylonitrile Butadiene Styrene ABS. A plastic filament is unwound from a coil and supplies material to an extrusion nozzle. The nozzle is heated to melt the plastic and has a mechanism which allows the flow of the melted plastic to be turned on and off. The nozzle is mounted to a mechanical stage which can be moved in both horizontal and vertical directions. Besides, this machine also have some limitation when produces the product. The machines only can produces the product with the size is about 10 inch length and 10 inch width. It also limited on the material of the product. The time to produce one part of the product also takes about 10 hours to be done. However, the PE has ability to float in the water due to density 950 kgm 3 is less than density water 1000 kgm 3 .

5.4 SCENARIO 1

5.4.1 Model

This scenario shows the mass and the volume of the part which is get from the ANSYS CFX10 analysis. This analysis is form based on the fixed support analysis.  The bounding box for the model measures 0.2 by 0.2 by 0.13 m along the global x, y and z axes, respectively. 76  The model has a total mass of 1.92 kg.  The model has a total volume of 2.02×10 -3 m³. Table 5.2: Bodies Name Material Nonlinear Material Effects Bounding Boxm Mass kg Volume m³ Nodes Elements pump holder Polyethylene Yes 0.2, 0.2, 0.13 1.92 2.02×10 - 3 22128 12387

5.4.2 Structural Support

This is the fixed support used to analyze the structural of the part. The reaction moment of the part when the force 220 N is applied on it is about 0.17 N.m. This shows that the part has a few displacements even though the fixed surface is applied. Table 5.3: Structural Supports Name Type Reaction Force Reaction Force Vector Reaction Moment Reaction Moment Vector Fixed Support Fixed Surface 220.0 N [0.0 N x, 0.0 N y, 220.0 N z] 0.17 N·m [-8.43×10 -3 N·m x, 0.17 N·m y, 0.0 N·m z] 77

5.5 Structural Load