Specific Strength Under Combined Loading

The work is devoted to the application of the concept of specific strength for the analysis of the degree of utilization of mechanical properties of beam material under combined loading. The beam is studied and force diagrams are constructed for various types of loads, such as pure bending with tension, pure bending with tension and torsion, pure bending with torsion, and the strength utilization factor of a beam with an arbitrary cross-section is obtained. The research method is based on the superposition of stress states with the determination of the difference between the resistance diagrams. The concept of material resistance to fracture in the form of ultimate stresses distributed over the body volume is introduced. The method of calculating the specific strength for a beam under combined stress, as well as for thick-walled pipes loaded with internal pressure, is given. The relationship between the beam cross-section of the beam and the specific strength is presented, followed by a conclusion for the optimal application of the beam with the cross-section used.