Table of content Abstract Introduction Objectives Theory Apparatus Experimental procedure Data analysis Error analysis Content Result and Discussion Strain gauge paragraphs Conclusion References 2 Page 3 4 4 5 6

7 7 9 9 10 12 12 Abstract: A material usually becomes thinner in the other two directions when it is stretched in one direction. To assist us in evaluating the material property, we need a ratio. The one that did compress is ductile, whereas the one that did not were brittle. Therefore, in this experiment, after determining the various two strains using the blue hell universal machine on two different materials, we will apply the Poisson's ratio (Aluminium and Steel). The main goal of this experiment was to calculate the Poisson's ratio for steel and aluminium. To comprehend the materials' physical states as well as their behaviour (brittle or ductile) as based on the Poisson's ratio. As a result, this experiment will enable us to determine the lateral and axial strain for steel and aluminium. 3 Introduction: Engineering analysis uses a lot of required constants to figure out how much stress and deflection a material can withstand. Poisson's ratio is one of such conditions. For calculating the stress and deflection characteristics of a structure, Poisson's ratio remains constant. Stretching a material causes both its length and cross-sectional area to change. The constant connecting these changes in dimensions is Poisson's ratio (v). As a result, we can define it as the proportion of relative contraction (Lateral or Radial strain) normal to the applied load to relative extension (Axial strain) in the direction of the applied load. In this experiment a sensor will be used called strain gauge. Objectives: Measure the stresses at two distinct locations on the provided stepped mild steel bar for a specific load inside the elastic domain. Learn about the material law. Measure the axial and transverse stresses in the available mild steel plate under elastic loading. Compare the results of the comparison between the two strains with Poisson. Theory: Where: - Longitudinal Strain Poisson's Ratio = Lateral Strain Lateral Strain Lateral Strain Longitudinal Strain Hence, E = 2G (1 + v) v is the poissons ratio E is the modulus elasticity (Pa) G is the shear modulus (Pa) Longitudinal Strain 5 Apparatus: This testing system is fully linked with data collecting. Given the variety of loads It is simply configurable to satisfy any testing requirements in terms of unit, test control, and test options. Software that "Test Works "real-time plotting allows you to view and respond to test events as they happen. Additionally, it has a graphical program that allows you to customize the data display by changing the colours, units, and scales axes, etc. There are other additional options, such as the ability to create your own program or final report. Statistical analysis included. MTS Fig. 1: MTS Universal Testing Machine 6 Fig. 2: Specimen for measuring Poisson's ratio of mild steel