### UDC:

539.3

### DOI:

10.23968/1999-5571-2018-15-1-53-56

### Pages:

53-56

### Annotation:

The author formulates and gives a proof of the following theorem of the elementary bending-moment theory: the stress state described by the formulas of Navier, Zhuravsky and Grashof, at a certain value of the Poisson factor (depending on the kind of section and the direction of cross-section force), is the exact solution of the theory of elasticity problem. Examples are provided.