For the bi-axial stress states listed below, draw the stress element. Calculate the principal stresses, and determine the angle from the x axis to the largest principal stress (sigma _(1)). Draw the new stress element at the principal orientation. Don't forget to label all details.
sigma _(x)=-8MPa, sigma _(y)=7MPa, au _(xy)=-6MPa
2. For the bi-axial stress states listed below, draw the stress element. Calculate the principal stresses, and determine the angle from the x axis to the largest principal stress (o). Draw the new stress element at the principal orientation. Don't forget to label all details.
o=-8MPa, y=7MPa, au _(xy)=-6MPa