I. Abstract: This experiment tests two parameters‚ deflection and strain‚ associated with a simple truss subjected to a loading at its bottom end as would be the case if a constructed bridge was subjected to loadings by cars‚ trucks‚ trailers‚ pedestrians‚ etc. The set up contained an instrumented truss mounted in a test frame with strain gauges attached to the center of each truss member and a linear potentiometer displacement transducer (LPDT) placed underneath the truss assembly to measure displacement
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material on the outside of the curve experiences tension. In pure bending‚ the transverse planes in the material remain plane and parallel during bending. Objectives 1. To measure deflections and strains in a simply supported steel beam. 2. To compare the analytical and experimental values of strains in the beam. 3. To use measured deflections and theory to evaluate the Young’s modulus of the material. 4. To note the source of errors in a typical simply supported beam experiment. Theory
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(length of the beam) =18.4 in I= (bf*D3 – h3 (bf – tw))/12= 57.6 in4; E (Referenced value of Young’s modulus) = 29X106 psi Theoretical Strain: ε= σ/E= (M*y)/(E*I) P = load a = distance from support to the applied load (48 in) y = distance from neutral axis to the extreme element in y-direction The sing in the theoretical strain (±) determines if the strain is in compression or tension. * For P = 2000lbs: ε = (2000*48*±4)/( 29X106 *57.6) = ± 230 x 10-6. * For P = 4000lbs: ε = (4000*48*±4)/(
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STRENGTH OF MATERIAL TENSILE TESTING OF METALS STRENGTH OF MATERIAL TENSILE TESTING OF METALS OBJECTIVE : Tension test is carried out; to obtain the stress-strain diagram‚ to determine the tensile properties and hence to get valuable information about the mechanical behavior and the engineering performance of the material… INTRODUCTION: A tensile test‚ also known as a tension test‚ tests a material’s strength. It’s a mechanical
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1. Advantages of photodiode: Select one: a. It is Very small b. Voltage generating characteristic c. It has fast time response d. It has slow response 2. Advantages of PLCs than Hard wired Relay: Select one: a. easily programmable b. Highly reliable c. None of these d. both Highly reliable and easily programmable 3. Approximately 400nm to 760 nm range is for Select one: a. Visible light band b. Far Infrared c. Ultraviolet d. Microwave 4. Discrete state process control
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Results and Calculations Figure 1: Stress-Strain Curve – Steel 1045 Figure 2: Stress-Strain Curve – Mild Steel Figure 3: Stress-Strain Curve – Aluminium Table 1: Physical Properties of Specimens Material Initial Gauge Thickness (mm) Final Gauge Thickness (mm) Initial Gauge Width (mm) Final Gauge Width (mm) Initial Gauge Length (mm) Final Gauge Length (mm) Initial Cross-Sectional Area (mm2) Final Cross-Sectional Area (mm2) Steel 1045 6.0 5.8 12.3 11.7 50.2 57.9 73.8 67.9 Mild Steel 6
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City University of Hong Kong Dept. of Physics & Materials Science AP2104 Mechanics of Solids Laboratory Manual Experiment 1 Pure Bending of a Beam Experiment 2 Torsional Deformations Experiment 3 Yield Criteria for Ductile Materials under Plane Stresses Experiment 1 Pure Bending of a Beam Objective 1. To examine the stresses at various positions of the beam under a constant load of pure bending. 2. To determine the curvature of deflection of the beam. Introduction
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loading conditions and record how the force and strain vary to different loads. The frame represented a simple roof trusses and the loading conditions are similar to what a typical roof would undergo. In this experiment a universal fame was used with load cells to provide the load and digital force and strain instruments to record the data. As the load was increased the strain went up linear showing a linear relationship between loading and strain. After analysing results it was found that the results
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to observe how a beam behaves under loading is crucial to understanding its key aspects. For example‚ aspects that could be explored are the threshold stress and strain above which a beam begins to behave in an unsafe and unpredictable manner. If extensive tests are carried out on a beam of a particular specimen then its behavioral
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slope of the linear portion of the stress-strain curve‚ it is usually specific to each material; a constant‚ known value. Yield Strength: This is the value of stress at the yield point‚ calculated by plotting young’s modulus at a specified percent of offset (usually offset = 0.2%). Ultimate Tensile Strength: This is the highest value of stress on the stress-strain curve. Percent Elongation: This is the change in gauge length divided by the original gauge length. Load - The force applied to a
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