The components of plane stress on an element of an industrial robot are shown. Determine the…

The components of plane stress on an element of an
industrial robot are shown. Determine the stresses _ and _ (a)
by using Mohr’s circle and (b) by using Eqs. (7.6) and (7.7).

Eq. (7.6)

Eq. (7.7)

For the states of plane stress given in Problems 7.48–7.51,
use Mohr’s circle to determine the principal stresses and the maximum in-plane
shear stress and show them acting on properly oriented elements.

Problems 7.48

_x = 20 MPa, _y
= 10 MPa, _xy = 0.

Problems 7.51

_x = 240 MPa, _y
= 120 MPa, _xy = 240 MPa.