Lab Report 5

Lab Report 5 - Laboratory 5 STRAIN MEASUREMENT James King...

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Laboratory 5 STRAIN MEASUREMENT James King Daniel Hegarty James Maresco ENME 351 Section 0103 Date: 10/28/09
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Objectives The objectives of this lab are to understand how strain gauges work, and also use them in experiments using Labview. We are going to use strain gauges to measure the static strain of cantilever and hollow beams, and measure these results in Labview. Instruments Used PC with National Instruments DAQ card Labview NI SCC-68 connector board NI SCC-SG03 2-channel half bridge signal conditioning module Solid and hollow cantilever beams Four strain gauges mounted to the cantilever beam o Nominal resistance: 120 Ω ± 0.1% o Gauge factor (GF): 2.1 ± 0.1% Weight set (10 g to 2000 g) 120 precision resistor for quarter bridge completion Caliper, ruler Set-up Exercise 5.1 For this exercise, we will make a quarter bridge circuit using a strain gauge on the cantilever beam, and a 120Ω resistor. Labview can measure both strain and voltage, so this is ideal for this experiment. We constructed the Block Diagram below to measure both the voltage and strain due to an applied load at the free end of the beam.
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We configured the strain channel of the DAQ with the following parameters: The voltage channel was also configured in a similar manner: After all this was setup, we had to calibrate the SCC-SG03 module. We had to use a screwdriver to twist a screw in the X-channel. This part was very hard because the screw was extremely sensitive and even just touching it would cause the voltage to jump drastically. We could not calibrate the module exactly, but once we got it close, then we recorded the values of the stain and voltage so that we know how much the measurements would be off by. We now ran our VI and measured the voltage and strain
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for different values between 10g and 1500g. We recorded these values in a table for future use. Load (gram) Strain (μStrain) Voltage (μV) Calculated Strain (μStrain) 0 -23.25 29.01 0.952380952 10 -14.51 17.36 0.569918419 30 2.72 -5.21 -0.171041184 50 20.5 -28.58 -0.93826431 100 61.86 -82.82 -2.718931075 200 147.46 -195.2 -6.408299273
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This note was uploaded on 02/13/2011 for the course ENME 351 taught by Professor Smela during the Spring '08 term at Maryland.

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Lab Report 5 - Laboratory 5 STRAIN MEASUREMENT James King...

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