EM 324 - EM 324 1 Intro stress strain o definition STE...

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EM 324 05/03/2008 13:07:00 1. Intro stress strain o definition, STE, Mohr’s Circle o Stress-strain relationship (Hooke’s Law) 2. Axial effect sigma = P/A, deformation = PL/AE 3. Pressure Vessel Axial =  4. Today – Torsional Loading definition – twisting of a straight bar when loaded by torques (moments) that  tend to produce rotation about the longitudinal axis. Convention for Torque? o Positive points out of the cut section.  o Use right hand rule to determine direction of internal torque Assumptions o Always a circular shaft (solid or hollow) o Straight; constant diameter o Shearing strains are small o Plane section before twisting remains straight o o QuickTime and a TIFF (LZW) decompressor are needed to see this picture. focus on triangle ABB’  also focus on C (radius), point D (any arbitrary distance between B and  the center No pull in the x-direction Epsilon-x = 0; deformation x = 0
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