FINAL Pressurised Cylinder with Open & Closed Ends - 2016...

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48642 Strength of Engineering Materials: Biaxial Stress in a Hydraulic Cylinder Laboratory Report Pressurised Cylinder with Open & Closed Ends2016Student: Duong,Dennis ID: 11980974 Student: Enriquez, Marlowe ID: 12071686 Student: Ngo,David ID: 12049918
I Table of Contents Table of Contents .......................................................................................................................................IList of Figures ...........................................................................................................................................IIList of Tables ............................................................................................................................................II1Introduction .......................................................................................................................................11.1Objectives .................................................................................................................................................12Methodology ......................................................................................................................................12.1Equipment .................................................................................................................................................12.2Procedure ..................................................................................................................................................23Results ...............................................................................................................................................33.1Open End Condition .................................................................................................................................33.2Closed End Condition ...............................................................................................................................34Discussion ..........................................................................................................................................44.1Calculations from Results .........................................................................................................................44.1.1 Open Ended Condition .....................................................................................................................4 4.1.2 Close-End Condition .........................................................................................................................5 4.2Further Analysis and Interpretation of Results .........................................................................................74.2.1 Comparison of Test Results ..............................................................................................................7 4.2.2 Comparison of Calculated Strains .....................................................................................................7 4.2.3 Explanation of Procedures ................................................................................................................8 4.2.4 Predicted Pressures ..........................................................................................................................8 5Appendices ......................................................................................................................................105.1Calculations ............................................................................................................................................10
II List of FiguresFigure 1 Objectives, Lab Notes (2016) ......................................................................................................................1 Figure 2 Open and Closed Ends Setup, Lab Notes (2016) ........................................................................................1 Figure 3 Foil type Strain Gauge Configurations, Lab Notes (2016) ..........................................................................1 Figure 4 Procedure, Lab Notes (2016) ......................................................................................................................2 Figure 5 Open End Strain vs Pressure Graph ............................................................................................................4 Figure 6 Closed End Strain vs Pressure Graph ..........................................................................................................5 Figure 7 Mohr's Circle for Strain of the Pressurised Cylinder ..................................................................................6 List of Tables Table 1 Open End Strain Results ...............................................................................................................................3 Table 2 Closed End Strain Results .............................................................................................................................3 Table 3 2.5MPa strain approximations .....................................................................................................................5 Table 4 Calculated values from Mohr's Circle ..........................................................................................................5 Table 5 Comparison of test results ...........................................................................................................................7 Table 6 Comparison of Strain Values ........................................................................................................................7
1 1Introduction The purpose of this report is to further investigate the results of the pressure vessel testing that we have recently undertaken. Through this investigation, we strive to deepen our understanding of the transformation of strain, onset of yield as well as the theory of open and closed thin walled pressure vessels. 1.1Objectives 2Methodology 2.1Equipment The thin walled cylinder apparatus is a mild steel hydraulically pressurised cylinder. Open and closed end conditions are controlled by a thrust knob on the front of the cylinder. As shown in Figure 2, when the thrust knob is “wound in” against the piston, the pressure force on the piston is reacted by the external frame and there is no axial load on the cylinder walls. This is known as open end conditions. When the thrust knob is “wound out”, the pressure force on the piston is reacted by the cylinder and an axial stress is developed in the cylinder walls. This is known as closed end conditions. Foil type strain gauges are bonded to the cylinders as shown in figure 3. For all gauges, the gauge factor is 2.00 and the gauge length is 6mm. The cylinder dimensions are OD 86.43mm and ID 79.98mm. Figure 1 Objectives, Lab Notes (2016)Figure 2 Open and Closed Ends Setup, Lab Notes (2016) Figure 3 Foil type Strain Gauge Configurations, Lab Notes (2016)

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