Laboratory Experiment Bending Stress This laboratory experiment contributes 30% towards the coursework component in Part II of the module. Carry out the experiment detailed in this handout. You are required to complete a logbook comprising the recorded data from the experiment, the calculation details, the comparison of experimental and calculation results, and comments on the results and sources of error. The logbook will be assessed according to the guidelines given during laboratory session(s). Completed work should be submitted electronically via the Blackboard, before the deadline specified on the Blackboard CW submission folder. You must attend the lab session. 1. Objective To measure the direct stress due to bending in a loaded beam and compare it with the calculated value. 2. Apparatus Strain gauged beam. Loading rig, weight carrier and weights. Strain gauge bridge. Vernier calliper. 3. Procedure (1) Measure the cross-sectional dimensions of the beam provided. Measure the beam span and note the Young's modulus for the beam material. (2) Connect the gauges to a strain gauge bridge in half bridge configuration and set the gauge factor. (3) Set up the loading and measurement positions as instructed. Zero the bridge with weight carrier in place. (4) Adding incremental mass up to 5 kg. Measure the strain. follow the calculation procedures mentioned in the lab slides. (5) Plot strain (ordinate) against load (abscissa). Calculate the bending stress for the beam configuration and loading conditions and plot bending stresses vs the load. (6) Compare the measured stresses in the lab versus the theoretical calculated stress. 4. Computation (1) Compute the I value of the beam using the cross-sectional dimensions. (2) Compute reactions as a function of the applied load, P. (3) Compute bending moment at the strain gauge measurement position. You must show your working. (4) Compute bending stress at the surface of the measurement position for each load applied. (5) Compute the theoretical bending stress and clearly discuss the difference between the measured and calculated stresses. 4. Logbook Record all experimental data Show computation details, step by step Plot strain (ordinate) against load (abscissa) from both measured results and calculated results, on the same graph. Compare the calculated and measured results. . Comment on the results and sources of error. TTT 4mm 25mm Load (Kg) AVexp (V) AR (0) Strain () r (mm) M (Nmm) exp (MPa) cal (MPa) 0 1 0.27 2 0.53 3 0.77 4 5 1 1.22