Lab Report - Faculty of Engineering and Industrial Sciences...

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Faculty of Engineering and Industrial Sciences HES 5320 - SOLID MECHANICS LAB. 1 - Flat Circular Pressure Plate - 2009 STUDENT NAMES & No.s Matthew DeBrincat, 6164811 Lab. Date & Time / Demonstrator : 3-9-09, 12.30 / Yakubu Ibrahim INTRODUCTION : The aim of this Experiment is to measure the behaviour of a thin flat aluminium circular plate with clamped edges ( GUNT item FL 120 - see Fig. 1 below) due to a series of pressure steps ( Δ p) and then to compare these experimental readings with theoretical calculations. Two different types of measurements will be taken at a number of radial locations – vertical deflection and strain. The experimental and theoretical deflections can be compared directly. However, the experimental strains must be first converted to experimental stresses before they can be compared with the theoretical stresses (see Appendix and References for further details ). Strain is measured at a number of locations (see Fig. 2 , page 3) using strain gauges bonded to the top surface of the thin aluminium plate. Readings from these strain gauges are monitored on an FL 151 Data Logger directly as microstrain ( 10 -6 m/m or μm/m ). IMPORTANT NOTES : 1) RETAIN a COPY of your Results for use with the FEM Assignment . 2) This experimental report may be written in a GROUP with a Maximum of Two (2) people. 3) DO NOT exceed 0.6 Bar Total Pressure. [ 1 Bar = 10 5 Pascals ]
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Fig. 1 - Flat Circular Pressure Plate Experiment PROCEDURE and RESULTS – DEFLECTION : Vertical upwards plate deflection (‘Z’ direction) is measured using the dial gauge (4) – in Fig. 1 , which has units of 0.01 mm. The dial gauge is mounted on a calibrated slide (5) and secured with a thumb screw, Tighten thumb screw prior to taking each measurement, record results in TABLE 1 , start measurements in centre. Pressure is applied to bottom surface of plate by rotating the oil reservoir knob (2). 1. Move dial gauge to centre and initially zero by rotating the face - subsequently do not change. Set starting pressure to ZERO and measure vertical ‘Z’ deflection at all noted locations. (This starting profile will be used as a Reference.) 2. Increase pressure to 0.2 and 0.4 Bar and repeat measurements of vertical ‘Z’ deflection at all locations noted for each pressure These readings are the raw deflection measurements. 3. From raw deflection measurements taken in Step 2 , subtract dial gauge readings at starting ZERO pressure ( Step 1 ), at corresponding locations. This will produce a set of corrected deflection readings for pressure steps Δ p of 0.2 and 0.4 Bar . Use these corrected exp’tal deflection readings when comparing with theory. 4.
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