Set up the FBD required to develop the stress transformation equations. Using the FBD, develop the stress transformation equations . Use the correct signs in the transformation equations with regard to . . . The definition of normal stress . . . Tension is positive.
Compression is negative.
The definition of shear stress . . . The definition of the angle . . . Counterclockwise is positive. Measured from the vertical plane to the n-t plane. Be able to use the stress transformation equations to obtain the normal and shearing stresses on any plane .