MECH2300 Beam Bending Pracs - Report Template

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The University of Queensland *

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2300

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Mechanical Engineering

Date

Apr 3, 2024

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docx

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Uploaded by ProfessorGullMaster1021

MECH2300 — Structures & Materials Report on Bending of Beams Experiments Students Details: For on-campus students, up to four students, only submit one report . First Name Family Name Student Email Studen t # 1 Hamid Pourasiabi Lighvan h.pourasiabilighvan@uq.net. au 444444 44 2 3 4

1. Sample Characteristics 2.1. Young’s modulus: E = GPa 2.2. Geometry: Position 1 Position 2 Position 3 Average Beam thickness (mm) Beam width (mm) 2. Uncertainties Source * Value (unit) Micrometre – instrument resolution Micrometre – human error Vernier caliper – resolution Vernier caliper – human error Dial gauge – instrument resolution (deflection) Dial gauge position – human error (axial position) Balance – resolution Mass position – human error (axial position) * Important: See Section 5 of Description of Bending of Beams Practical. [Discuss the uncertainty analysis] 3. Module 1a – Deflection at One Location 3.1. Dial gauge location: [Select and report an appropriate location for the dial gauge. Fix the dial gauge at the selected location before starting with the measurements.] 3.2. Location of mass: [Select and report an appropriate location for the mass. You will need to select several various weights to measure its effect on the beam deflections.] 3.3. Location of strain gauge: [Measure and report location of the strain gauge. Be careful not to damage it!] MECH2300 – Structures & Materials Report on Bending of Beams Experiments 1 On-campus students Last update: February 2024

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Note: All the locations are measured from the fixed end of the beam. 3.4. Measurements: No. Mass (kg) Deflection (mm) Stress (MPa) 1 2 3 4 5 6 7 8 3.5. Charts: [Insert the relevant charts (for Figure 1 and Figure 2) from the software exported report. Make sure that in the software and during your experiments you have activated ‘Theoretical Curves’. For this you will have to enter the required parameters in the software.] [Labels: If you have not labelled your graphs in the interface software of the test rig, describe the axis labels and their units in the figure captions.] MECH2300 – Structures & Materials Report on Bending of Beams Experiments 2 On-campus students Last update: February 2024 Delete this rectangular and the text inside it. Place your graph in its place (centred, in line with text, single-line paragraphing). In order to maintain the quality of the image, please do not change its ‘aspect ratio’.

Figure 1. Deflection versus Load. Figure 2. Bending Stress versus Load. 3.6. Second moment of area: [Calculate the second moment of area of the beam and explain how it contributes to determining the theoretical curve(s) and to the measurement uncertainty.] 3.7. Conversion factor: [Calculate the conversion factor (see Section 4 of Description of Bending of Beams Practical) and explain how it is used to determine the theoretical curve(s).] 3.8. Discussion: [Critically discuss the results. Explain the reason(s) for the difference between experimental measurements and theoretical predictions. In your discussion, include an uncertainty analysis based on the data provided and other factors mentioned in ‘Hints & Tips’.] MECH2300 – Structures & Materials Report on Bending of Beams Experiments 3 On-campus students Last update: February 2024 Delete this rectangular and the text inside it. Place your graph in its place (centred, in line with text, single-line paragraphing). In order to maintain the quality of the image, please do not change its ‘aspect ratio’.

4. Module 1b - Cantilever Shape 4.1. Location of mass: [Select and report an appropriate location for the mass. You will need to measure the beam shape using the selected mass weight at this fixed location.] 4.2. Mass: [Select and report an appropriate mass for this module. For this, make sure that the mass weight is sufficient to create accurately measurable deflection throughout the beam. Also make sure that the created deflection is not out of the measurement range of the dial gauge.] [Now you will need to measure the amount of the beam deflection at various locations. This way, you will be able to plot the beam shape. Enter and report your measurements in the below table.] No. Distance (mm) Deflection (mm) 1 2 3 4 5 6 7 8 4.3. Charts: [Copy and insert the deflection vs distance (from fixed end of the beam) chart from the software exported report. Make sure that in the software and during your experiment you have activated ‘Theoretical Curves’. For this you will have to enter the required parameters in the software.] [Labels: If you have not labelled your graphs in the interface software of the test rig, describe the axis labels and their units in the figure caption.] MECH2300 – Structures & Materials Report on Bending of Beams Experiments 4 On-campus students Last update: February 2024

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Figure 3. Deflection versus Distance. 4.4. Discussion: [Critically discuss the results. Identify possible sources of uncertainty to explain the discrepancy between experimental measurement and theoretical prediction.] MECH2300 – Structures & Materials Report on Bending of Beams Experiments 5 On-campus students Last update: February 2024 Delete this rectangular and the text inside it. Place your graph in its place (centred, in line with text, single-line paragraphing). In order to maintain the quality of the image, please do not change its ‘aspect ratio’.

5. Module 2a - Superposition 5.1. Dial gauge positions: [Select and report three different position for the dial gauge. You will need to validate ‘superposition principles’ in this module using two different masses at these selected dial gauge positions.] Position 1 = Position 2 = Position 3 = 5.2. Masses: [Select and report two different mass weights. Applying either and/or both masses, you will need to measure the beam deflection at the selected dial gauge position to validate ‘superposition principle’.] Mass 1 = Mass 2 = 5.3. Measurements: Dial Gauge Position (mm) D1 (mm) D2 (mm) Measured D1 + D2 (mm) Calculated D1 + D2 (mm) D1: deflection due to mass 1 D2: deflection due to mass 2 D1+D2: deflection due to combined loading 5.4. Discussion: [Critically discuss the results.] MECH2300 – Structures & Materials Report on Bending of Beams Experiments 6 On-campus students Last update: February 2024