| This week you will
be given strips of transparency film. Each strip has four
printed squares, with each rotated a different amount,
representing four coordinate systems. You will measure the
size and orientation of each square, stretch the strip in one
direction, and then remeasure. Between your calipers, a protractor, and
some averaging you should be able to
calculate the normal and shear strains for each square.
You will then check whether the squares provide the same
principals, max shear, and θp....which they should.
This will hopefully demystify the topic of strain transformation, because we can visually see the deformation (unlike with a strain gage) and measure it by hand. The logic is simple enough for everyone to get an intuitive feel for the different strain concepts. We will also look at photoelasticity, which will hopefully help us visualize how force flows through a few basic shapes. |
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Video Lecture (17 minutes) Notes Assignment |
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