The components of plane stress on an element of an
industrial robot are shown. Determine the stresses _ and _ (a)
by using Mohrs circle and (b) by using Eqs. (7.6) and (7.7).
For the states of plane stress given in Problems 7.487.51,
use Mohrs circle to determine the principal stresses and the maximum in-plane
shear stress and show them acting on properly oriented elements.
_x = 20 MPa, _y
= 10 MPa, _xy = 0.
_x = 240 MPa, _y
= 120 MPa, _xy = 240 MPa.