Dear Colleagues, This problem causes me a headache - any suggestions? I have a truncated cone under bending on two axes. I take a section where I have two acting side forces - Qx & Qy I want to find shear stresses acting in the point A which is on a circumstance of the section 45° between axes X and Y. I independently calculate sheer stress from force Qx -> τx and Qy -> τy. The resultant shear force will be τxy. On the other hand, I can in the begging take the resultant side force of Qx & Qy -> Qxy. The direction of this force will be 45° to axes X and Y. In this case there will be no shear stress at point A So which assumption is correct? Why are these different?