The ideal test should provide a region of pure, uniform shear stress within the test sample.
The most simple test is the tension test on the (+/-45°)ns sample, where n is greater than one.

The specimen width is usually between 13 and 25 mm and strain gauges are bonded to the sample at 0° and 90°.
It can be shown that the shear stress in the sample, τ12,


Where σx is the stress in the longitudinal direction (=P/A).

The shear modulus, G₁₂, is determined by plotting the shear stress against the shear strain and measuring the slope of the resulting curve. 

Posted Date: 8/27/2012 7:56:49 AM | Location : United States

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