Question: A plane stress element has x = - 4 MPa, y = 1 2 MPa, and x y = 7 MPacw, as shown in Figure

A plane stress element has x=-4MPa,y=12MPa, and xy=7MPacw, as
shown in Figure Q1.
(a) Using Mohr's circle, find the principal stresses and directions, and show these on
a stress element correctly aligned with respect to the xy coordinates. Draw another
stress element to show 1 and 2, find the corresponding normal stresses, and label
the drawing completely.
Figure Q1
A plane stress element has x = - 4 MPa, y = 1 2

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