Reference no: EM132456335

Question 1. Measure the distance from the center line of the rosette to the loading point on the free end of the beam (L).

Question 2. Finally, use a protractor to measure the counterclockwise angles between Gage 1 axis and lateral and longitudinal beam axes.

Question 3. Using the cantilever beam flexure formulae , calculate the load P, to be applied at the free end of the beam for a stress value of σ = 15000 psi.

Question 4. Back the calibrated loading screw and insert the beam into the Flexor with the gaged end in the clamp, and with the gage on the top surface.

Question 5. Connect the lead wires from the rosette to the binding posts of the flexor as per the wiring diagram given in the handout. Be careful when handling the wires.

Question 6. Connect one of the common leads from the flexor (#1) to the S- binding post of the strain indicator.

Question 7. Connect the other common lead from the flexor (#2) to the D-120 binding post of the strain indicator.

Question 8. Connect the independent lead from Gage Element 1 (#3) to the P+ binding post of the strain indicator.

Question 9. After balancing the strain indicator amplifier, set the gage factor to the value given on the strain gauge.

Question 10. With the beam unloaded set the instrument to RUN.

Question 11. Adjust the balance control of the strain indicator until the digital readout indicates precisely zero (there may be some fluctuation; if so, note the average reading). Do not adjust the balance control again during the experiment.

Question 12. The initial reading for the strain Gage Element 1 should now be recorded on the worksheet as 0με (or the averaged reading from the step above).

Question 13. Turn the strain indicator off, and disconnect the independent Gage Element 1 (#3) lead from the P+ binding post; leave the common leads connected.

Question 14. Now, connect the cable lead from Gage Element 2 (#4) to the P+ binding post and then turn the instrument on.

Question 15. Without adjusting the balance controls, note the reading on the indicator display.

Question 16. This is the initial reading for Gage 2, and should be recorded on the worksheet.

Question 17. Turn the strain indicator off, and disconnect the independent Gage Element 2 (#4) lead from the P+ binding post, leaving the common leads connected.

Question 18. Connect the cable lead from Gage Element 3 (#5) to the P+ binding post and turn the instrument on.

Question 19. Without adjusting the balance controls, note the reading on the indicator display.

Question 20. This is the initial reading for Gage 3, and should be recorded on the worksheet.

Question 21. After recording the initial reading for Gage Element 3, leave the gage connected and apply the previously calculated load ‘P'; Hang the weights on the free end of the beam.

Question 22. Record the exact weight ‘P' on the work sheet and record the indicated strain for Gage Element 3 in the table.

Question 23. With the load on the beam, turn the strain indicator off and remove the Gage Element 3 (#5) and replace it with the Gage Element 2 (#4) to the P+ binding post.

Question 24. Turn the strain indicator on and record the indicated strain for Gage Element 2 in the table.

Question 25. With the load on the beam, turn off the strain indicator and remove the Gage Element 2 (#4) and replace it with Gage Element 1 (#3) to the P+ binding post.

Question 26. Turn the strain indicator on and record the indicated strain for Gage Element 1 in the table.

Question 27. With the last gage still connected to the instrument, remove the load from the beam. The strain indicator readout should now indicate the same (within a few με) as the initial reading for this gage.