Calculation of the t-shaped shank of the steam turbine rotor blade

The broad possibilities of the developed approach [8, 9, 11, 12] are illustrated by the solution of a new practically important task related to specific design developments. The most important load-bearing elements of the rotors of steam turbines are the blade shanks. This paper presents the calculation of the T-shaped shank, which is affected by the forces caused by the rotation of the rotor. They consist of the surface load blade distributed over the area of the root section of the blade and mass forces distributed over the volume of the shank. but along some of its central parts. This leads to an uneven distribution of contact forces along the axis along the shank. The results of the calculation allow us to draw the following conclusions that in the case of a uniform load, the determination of stresses can be carried out within the framework of a flat setting, since this leads to a relatively small (five, eight percent) error compared to the spatial setting. Taking into account the uneven nature of the load distribution along the length of the shelf allows you to significantly clarify the level of maximum stresses in comparison with a flat problem. Thus, the value of the intensity of tangential stresses increased by more than thirty percent and exceeded the yield strength of the material. The results of the calculation of the shank beyond the elastic properties of the material are presented in this work and reflect the development of the zone of plastic deformations in the plane Z3'=0. By studying the influence of the geometric parameters of the shank, it was found that a decrease in the level of plastic deformations can be achieved by simultaneously increasingthe radiusthe gap and the width of the shelf.