''It is generally more useful to transform the angle at which you are plotting the stress into one that causes the shear components to be zero'', why ? Because as far as I know, ductile materials fail in the direction where the shear stress is maximum. Why do we need to check the max and min principal stresses and their directions for a ductile material?n''That means design parts so that the load path travels axially through the part. Avoid part designs where the load tries to bend the part'', Is this because the magnitudes for max and min principal stresses are going to be greater in the bending case as compare to a axial loading case, since there will also exist an initial shear stress on an element within the structure in the former, while no initial shear stress on the element in the latter.nYou mentioned this, ''Make the part longer to reduce stress'', how will it reduce the stress Sir? Does STIFFNESS and RIGIDITY of a structure has an effect on the stresses observed within the structure? (because we all know stiffness and rigidity has an effect on strains definitely). Because increasing the length of beam will decrease its stiffness which means the displacements would increase, but how would it decrease the stresses experienced by the cantilever beam. Is it because the moment arm has increased (which, by the way, should cause the stresses to soar up), or does it actually have to do with the change in stiffness of the structure?n