Final report for Pressure vessel

Topics: Safety, Approximation, Autodesk Pages: 13 (552 words) Published: March 8, 2015

Using Ansys and Inventor | Yatharth Vora (11005909)

Contents
1.Problem Description3
2.Solution:3
3.RESULTS11

Table of figures:
Figure 1:CAD DRAWING3
Figure 2: VESSEL HEAD WITH HOLE3
Figure 3: 3D VESEEL4
Figure 4:VESSEL HEAD WITHOUT HOLE4
Figure 5: ANSYS WORKBENCH VIEW4
Figure 6: GEOMERTY IN ANSYS4
Figure 7: ANSYS MESH VIEW5
Figure 8: INLET AND OUTLET VALUES6
Figure 9:CFX SOLUTION6
Figure 10: MATERIALS SELECTION IN INVENTOR7
Figure 12: MESH VIEW IN INVENTOR8
Figure 11: PRESSURE APPLIED7
Figure 13: INITAL ANALYSIS8
Figure 14: PARAMETRIC ANALYSIS9
Figure 15: PARAMETRIC TABLE9
Figure 16: PARAMETRIC TABLE WITH RESULTS10
Figure 17: VALE OF FACTOR OF SAFTEY BELOW LIMIT10

1.Problem Description
Do the Stress Analysis using FEM and Fluid flow analysis using Ansys (Multi-physics flow) of a pressure vessel with given dimensions and initial thickness and find the optimized thickness with lowest acceptable factor of safety to make the design economic.

Figure 1:CAD DRAWING
2.Solution:
1. The geometry was created in Autodesk Inventor and the details can be seen in the following figure and user defined dimensions were chosen.

2. A solid was sculpted from the interior surface of the vessel to feed into Ansys as seen in following figures.

3. The sculpted solid was imported in Ansys as a .stp (step) file and meshing was done was per requirement.

Figure 7: ANSYS MESH VIEW
4. Boundary conditions were defined and solution output and control was decided and inlet outlet values were given. INLET :- 3.5 bar and OULET: 3 bar

5. Ansys solves the problem and gives the maximum pressure to be approximately equal to 0.339 MPa.

Figure 9:CFX SOLUTION
6. This value of pressure is noted and used in inventor. In stress analysis tool of the inventor a static single point solution was selected along with other conditions and materials and pressure values were given.

Figure 10: MATERIALS SELECTION IN INVENTOR

7. Meshing was done and inventor solved the problem to give an minimum factor of safety to be 4.92. Figure 12: MESH VIEW IN INVENTOR

Figure 13: INITAL ANALYSIS
8. Now the optimization of the design to be achieved by changing the thickness so that the factor of safety reduces until a acceptable value is reached and the design is more economic. Inventor is asked to do iterations for optimization using Parametric solution now in a new copied simulation from the previous one and different set of values for thickness :- 1.1,1.2,1.5,2 are given.

Figure 14: PARAMETRIC ANALYSIS
Figure 15: PARAMETRIC TABLE

9. Inventor finds the optimum value of thickness which is, thickness to be equal to 1.2mm instead of 2mm and new Factor of safety is 1.6. Figure 16: PARAMETRIC TABLE WITH RESULTS

Figure 17: VALE OF FACTOR OF SAFTEY BELOW LIMIT
10. Minimum acceptable factor of safety is achieved and design is SAFE and ECONOMICALLY optimized. 3. RESULTS
Table 1: FINAL RESULTS
ITERATIONS
THICKNESS
FACTOR OF SAFTEY
1
2
4.92
2
1.5
2.56
3
1.2
1.60
4
1.1
1.12

Thus to conclude, the final optimized thickness, giving an acceptable factor of safety of 1.60 is achieved at 1.2mm. So the final design is with 1.2mm thickness which was automatically changed by inventor after accepting the optimized result.
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