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Unformatted text preview: clockwise. Normal Stresses, (j Positive: Negative: Shear Stresses, 't Positive o o Negative o o Orientation .of Planes  The Pole Point, Op I aa 't a 0 + ... ab 'tb Procedure for finding Op: 1. Draw a Mohr's circle. ·2. Draw a line through the point aa, 't a parallel to plane a (Plane a is the plane on which aa and 't a act). 3. The pole point is the point, Op, where the line intersects (or in special cases is tangent to) the Mohr's circle. 4. If the stresses, ab and 't'b on another plane (Plane b) are known, draw a line parallel to plane b; this line should also intersect the circle at Op. Note: The planes, e. g. lIa" and "b n do not have to be horizontal or vertical; the planes can be inclined at any angle. Example: ('5v = ('51 = 2000 pst ('5h = ('53 = 1 000 pst Find orientation ot 't max • " " Planes of 't max Suppose instead we have: Consider another example: l ...
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 Spring '11
 Rosenblad
 Force, Geotechnical Engineering, Shear Stress, Euclidean geometry

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