Mohr’s circle is shown in Figures P12.67 for a point in a physical object that is subjected to plane stress. (a) Determine the stresses x , y , and xy , and show them on a stress element. (b)...

Mohr’s circle is shown in Figures P12.67 for a point in a physical object that is subjected to plane stress.

(a) Determine the stresses

_x,

_y, and

_xy, and show them on a stress element.

(b) Determine the stresses

_n,

_t, and

_nt, and show them on a stress element that is properly rotated with respect to the x–y element. The sketch must include the magnitude of the angle between the x and n axes and an indication of the rotation direction (i.e., either clockwise or counterclockwise).