Examples of Mohr's Circles in Plane Strain
engineering fundamentals Plane Strain: Mohr's Circle Examples
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Case 1:   exy > 0 and ex > ey
The principal axes are counterclockwise to the current axes (because exy > 0) and no more than 45º away (because ex > ey).

Case 2:   exy < 0 and ex > ey
The principal axes are clockwise to the current axes (because exy < 0) and no more than 45º away (because ex > ey).

Case 3:   exy > 0 and ex < ey
The principal axes are counterclockwise to the current axes (because exy > 0) and between 45º and 90º away (because ex < ey).

Case 4:   exy < 0 and ex < ey
The principal axes are clockwise to the current axes (because exy < 0) and between 45º and 90º away (because ex < ey).

Case 5:   exy = 0 and ex > ey
The principal axes are aligned with the current axes (because ex > ey and exy = 0).

Case 6:   exy = 0 and ex < ey
The principal axes are exactly 90° from the current axes (because ex < ey and exy = 0).

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