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ME345_Lecture_28

# ME345_Lecture_28 - M E 345 Spring 2008 Professor John M...

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M E 345 Spring 2008 Professor John M. Cimbala Lecture 28 03/26/2008 Today, we will : Finish review the pdf module: Stress, Strain, and Strain Gages Discuss an additional item not in the pdf notes: Transverse strain, strain gage rosettes Do some example problems – stress, strain, transverse strain, and strain gages

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Example Given : A round steel rod is hung vertically, and weight is attached at the bottom to provide tension (positive axial strain), as sketched. L 1 = original length = 0.50 m D 1 = original diameter = 12.0 mm E = modulus of elasticity = 10 × 10 10 N/m 2 ν = Poisson’s ratio = 0.300 m = mass of the weight = 1000 kg To do : Calculate δ L = L 1 L 2 and D = D 1 D 2 . Solution : L 1 L 2 D 2 D 1 Weight, W

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Example Given : A quarter-bridge strain gage circuit is constructed using R 3 as the strain gage, as sketched. The beam being measured is located a short distance from the bridge circuit. Unfortunately, the temperature at the location of the experiment fluctuates a lot, and the
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ME345_Lecture_28 - M E 345 Spring 2008 Professor John M...

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