Von Mises plane stress

Calculates Tresca equivalent stress for plane stress with the third principal stress set to zero.

Calculates the maximum in-plane shear stress of a plane stress state.

Transforms sigma_x, sigma_y, and tau_xy for a specified axis angle theta.

Finds the two perpendicular principal directions of a plane stress state.

Calculates the two principal stresses, maximum in-plane shear, and principal-axis direction for a plane stress state.

Calculates allowable stress as yield strength divided by safety factor.