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lab6 - STRAIN GAUGE MEASUREMENT Last updated Dec 11 2007 M...

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S TRAIN G AUGE M EASUREMENT Last updated Dec. 11, 2007, M. Lucas Purposes of the Experiment 1) To familiarize the student with the theory of operation of bridge circuits and strain gauges. 2) To illustrate an application of strain gauges in measuring the deflection of a cantilever beam in free vibration and under static loading. 3) To use National Instruments Virtual Bench for performing linear regression analysis, for better understanding the principle behind calibration. Theory Stress and Strain For the sake of simplicity, materials are often considered to be rigid engineering analysis. However, in the real world, materials experience deformation when placed under load. The term stress refers to the internal forces (per unit area) developed in a material that is under load. Strain , on the other hand, is a dimensionless measure of the deformation of such a loaded member. Consider, for example, a cylindrical bar that is loaded in simple axial tension: F F L 0 L 0 + Δ L Figure 1: Bar in Axial Tension
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