15676_pv_lab_report_-_biaxial_stress_in_a_hydraulic_cylinder.pdf

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Strength of Engineering Materials 48642 PV Lab Report Biaxial Stress in a Hydraulic Cylinder Pressurised Cylinder with Open & Closed ends Collaborated by Jason Gravanis 11379322 Josip Crepulja 11441538 Thinkswap Document
10 th Sept, 2014 2 Contents 1. Introduction .............................................................................................................................................. 3 2. Equipment ................................................................................................................................................. 3 3. Method ..................................................................................................................................................... 3 4. Results ....................................................................................................................................................... 4 5. Calculations ............................................................................................................................................... 5 5.1 Open End Condition ............................................................................................................................ 5 5.2 Closed End Condition .......................................................................................................................... 6 ...................................................................................................................................................................... 9 7. Analysis and Interpretation of Results .................................................................................................... 10 8. References .............................................................................................................................................. 12 Thinkswap Document
10 th Sept, 2014 3 1. Introduction This experiment covers and verifies the transformation of strain theory as well as thin walled cylindrical pressure vessel theory. The experiment of a thin walled cylinder placed undergoing biaxial stress demonstrates the application of yield criteria to predict onset of yield. 2. Equipment A mild steel hydraulically pressurised cylinder is used as a thin walled cylinder. This apparatus simulates both open and closed end conditions through a thrust knob, situated on the front of the cylinder (See figure 1). Open end condition is achieved when the thrust knob is “wound in”, the external frame reacts to the force placed on the piston and there is no axial load on the cylinder walls. Closed end condition is achieved when the thrust knob is “wound out”, the pressure from the piston on the cylinder develops an axial stress in the cylinder walls. Foil-type strain gauges have been secured to the cylinder (see figure 2), each placed at a different angle (0°, 15°, 30°, 45°, 75° and 90°). Figure 1 Thin walled cylinder set up Figure 2 Foil-type strain gauges The thin walled cylinder is connected to a hydraulic pump which is used to pressurise the cylinder. Attached to the hydraulic pump is a pressure gauge, used to determine the pressure in the cylinder (MPa). Attached to the cylinder are foil-type strain gauges, the readings display the strain in micrometers (μm ). 3. Method Prior to beginning record both inner and outer diameters of the pressure vessel and ensure strain gauges are bonded appropriately. Open End Condition: 1. Bleed out pressure from hydraulic pump then “wound in” thrust knob to simulate open end condition (see figure 1).

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