Mechanics 3

at Universität Duisburg-Essen

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Why here is positive?
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Does anyone know why in exercise (b), even though the angle is the same as the principal direction, they have different readings for the normal and shear stress? Thank you in advance! :)
You read the angle not at the point P, but at the end of the angle (2phi). So approximately it will be principal stress as well as 0 or (0,18 if you'd like to be more exact)
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Hallo, Does anyone have solutions to exercise problem 17 b and c part? Oscillating rod in a box. Thanks in advance :D