The principal stress axes for a 2-D geometry are oriented at N45◦ E and N135◦ E, corresponding to principal stresses of −15 and −10 MPa. What are the four components of the 2-D stress tensor in a (x = east, y = north) coordinate system

  The principal stress axes for a 2-D ge
corresponding to principal stresses of
ponents of the 2-D stress tensor in a (ometry are oriented at N45◦ E and N135◦ E,
-15 and -10 MPa. What are the four com
x = east, y = north) coordinate system