Bending Deformation Of Tie Rod

Tie rods are combined for pre-tightening. The structural form of the tie rods, the selection of pre-tightening force, and the arrangement of shoulders will have a great impact on the overall dynamic characteristics of the rotor. A structure that often appears on building materials, and many building structures or materials will be built as tie rods. Such as single-layer cylindrical reticulated shell, diffraction grating marking machine, etc.
At static time, there is an installation gap between the gas turbine tie rod shoulder and the wheel tie rod hole. When working in a high-speed environment, the tie rod is bent and deformed by the centrifugal force, and the shoulders are in contact with the hole of the tie rod. The tie rods in between are regarded as statically indeterminate simply supported beams. From the approximate differential equation 41 of the deflection line of the beam in classical mechanics of materials and the boundary conditions of the simply supported beam model in this paper, the maximum deflection of the tie rod between the two shoulders is obtained, and the deformation of the tie rod is proportional to the fourth power of the span Z, It is inversely proportional to the fourth power of the rod diameter d. The main purpose of improving the tie rod structure from the perspective of strength is to effectively reduce the deformation and stress of the tie rod. Since the method of increasing the diameter d of the tie rod is limited by the radial and circumferential space of the wheel disc, reasonably increasing the number of shoulders to reduce the span Z of the tie rod shoulder should be to improve the structure of the tie rod, reduce the deformation of the tie rod and Optimal direction of stress.