351Lab5 - Laboratory 5 STRAIN MEASUREMENT Time Aigbe...

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Laboratory 5 STRAIN MEASUREMENT Time Aigbe Partners: Andrew Collins Bryan Hammond ENME 351 Section 0102 Date of Experiments: 10/16/07 and 10/23/07
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Time Aigbe ENME 351 – Sec 0102 Lab 5 – Page 2 OBJECTIVES: The objective of this lab was to observe how strain gauge placement can impact the measuring of strain along a cantilever beam. In addition, this lab presented more about LabVIEW and its capabilities via the signal conditioning module and connector board. INSTRUMENTS: DELL computer LabVIEW 8.0 software NI SCC-68 connector board NI SCC-SG03 2-channel half-bridge signal conditioning module Solid Cantilever Beam Hollow Cantilever Beam Four Strain Gauges (Nominal resistance: 120W ± 0.1%; Gauge factor (GF): 2.1 ± 0.1%) Weight set (10 g to 2000 g) 120 Ω precision resistor Caliper Ruler DESCRIPTION OF EXPERIMENT AND EXPERIMENTAL SETUP: Exercise 5.1 – Quarter Bridge Circuit Strain Measurement (near beam fixed end) For this exercise we set up the LabVIEW VI as can be seen in Figure 1. Only one strain gauge was used for measuring strain and it was placed near the fixed end of the cantilever beam. Figure 1: LabVIEW VI block diagram for Exercises 1, 2, 3, and 4
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Time Aigbe ENME 351 – Sec 0102 Lab 5 – Page 3 In addition to the strain gauge, a 120 Ω precision resistor was employed. Once the circuit and VI were set up properly, calibration took place by unloading the cantilever beam and turning a screw on the top of the conditioning module. The intent was to get the strain as close as possible to 0 (see Figure 3). Soon after, loading of weights occurred and pictures were taken at 500 g and 2000 g. The loads that the beam experienced ranged from 10 g to 2500 g. A picture of the setup can be seen in Figure 2 below. Figure 2: Experimental setup for strain measurement Exercise 5.2 – Half-Bridge Circuit Strain Measurement (near beam fixed end) For this exercise we employed two strain gauges on the edge of the beam that is fixed. Calibration occurred the same way as it did in Exercise 5.1 and pictures of the data were recorded at 500 g and 2000 g loading conditions. Total loading conditions ranged from 10 g up to 2500 g. Exercise 5.3 – Half-Bridge Circuit Strain Measurement (near middle of beam) For this exercise we employed two strain gauges once again except they were placed near the middle of the beam. Calibration occurred the same way as it did in Exercise 5.2 and pictures of the data were recorded at 500 g and 2000 g loading conditions. Total loading conditions ranged from 10 g to 2500 g. Exercise 5.4 – Strain Measurement on Hollow Beam For this exercise we employed a hollow beam instead of a solid one. A half bridge circuit involving two strain gauges was used to measure the strain. Calibration occurred the same way as it did in the first three exercises and pictures of the data were recorded at 500 g and 2000 g loading conditions. Total loading conditions ranged from 10 g to 2500 g.
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Time Aigbe ENME 351 – Sec 0102
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351Lab5 - Laboratory 5 STRAIN MEASUREMENT Time Aigbe...

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