Direct Shear, Torsion Testing

This week we'll be running elastic-inelastic torsion and direct-shear tests.  You will collect torsion data until the bar becomes fully plastic and use that data to calculate G and the shear yield strength.  While we're waiting for the torsion specimen to fracture, we'll also run a double-shear test.  You'll compare the torsion and direct shear results with your tension results from earlier in the semester.

Video Lecture (20 minutes) Direct Shear Notes Shear Stress Double Shear Test Video ASTM Standards Torsion Notes Objectives Torsion Test Video Equipment Fracture Geometry crankshafts half-shafts Theory short version full version ASTM Standards Assignment

photos by Jeff Thomas, 2004 & 2000

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