Pressure Vessel

Pressure Vessel - Discussion Since the pressure increases...

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LABORATORY EXPERIMENT: Pressure Vessel Frank Bryan Group 5 MAE 244 Sec 4: Nick Wu 04/25/06
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Schematic Pressure Vessel Pressure Indicator Strain Gages
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Analysis of Results t= (in) 0.0675 v= 0.33 D= (in) 3.5 E= (psi) 1.00E+07 Gage Angle 0 -45 67.5 45 90 Channel No. 1 2 3 4 5 Pressure (PSI) µε µε µε µε µε 0 0 0 0 0 0 20 12 25 36 24 37 40 20 46 68 46 72 60 28 67 99 68 106 80 36 88 129 89 140 Values for 80 PSI Gage σ z σ h ε z ε h ε Θ 0 1037.037 2074.074 3.53E-05 0.000173 35.259 -45 1037.037 2074.074 3.53E-05 0.000173 104.222 67.5 1037.037 2074.074 3.53E-05 0.000173 152.986 45 1037.037 2074.074 3.53E-05 0.000173 104.222 90 1037.037 2074.074 3.53E-05 0.000173 173.185 ε Θ (theoretical) ε Θ (experimental) % difference 35.259 36 2.10 104.222 93 10.77 152.986 129 15.68 104.222 89 14.61 173.185 140 19.16 All ε measured in µε. All σ measured in psi.
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Pressure vs Strain #1 -20 0 20 40 60 80 100 120 140 160 0 20 40 60 80 100 Pressure (psi) Strain (µε) 90 Degrees 0 Degrees -45 Degrees Linear (90 Degrees) Linear (0 Degrees) Linear (-45 Degrees) 0 0 0 20 36 24 40 68 46 60 99 68 80 129 89 Series 1 = 67.5 degrees Series 2 = 45 degrees Series 3 = Linear (67.5) Series 4 = Linear (45)
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Unformatted text preview: Discussion Since the pressure increases in a linear fashion, the strain is also expected to increase linearly. The graphs with the trend lines show that the strain does just what it is supposed to do. The values for the strain of the theoretical and the experimental tests match up fairly closely. The highest percent difference was at about 19% and the lowest was about 2%. This shows that the values are not too far off and the tests seem to be a success. The source for error could be accounted for my slight variations in the voltages of when the strain gages were measured. Calculation errors in the theoretical values could have also caused slight differences. References Figure 1 Dynamics and Strengths Laboratory Website http://www2.cemr.wvu.edu/~wu/ mae244/lab0-introduction/syllabus.pdf...
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Pressure Vessel - Discussion Since the pressure increases...

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