Issues of Calculating of Beams With Various Cross - Sections in the Case of Complex ElasticPlastic Deformations

In the case of elastic - plastic deformations the real process is considered for the beam of rectangular cross section, that is, a nonlinear dependence between stress and deformation at pure bend. When 𝐸 = 0, proportions 𝑀 𝐼𝑛 = 𝐹 𝑅𝑛 = 𝜎 𝑦𝑛 were obtained, which express a real picture of bending. The calculated equation of deflection is derived, and a concrete example with its use has been resolved. On the example of a triangular cross section, the effect of the form of the cross section on the given calculations is shown. The task is considered when the beam at the same time has a cross section of a complex shape and be in conditions of complex deformation. At the oblique bending, an expression of the full plastic moment is given and its direction is established by the centroid focuses.