![]() ![]() Bowie first solved the plane problem of elasticity corresponding to an infinite region containing radial cracks at the boundary of an internal circular hole however, the models had difficulties in finding the accurate polynomial mapping. įor the cracks in the holes, many researchers have studied for many years. At present, SIFs are mainly solved by using an experimental method, weight function method, and finite element method. The stress intensity factor (SIF) can reflect the strength of the stress field at the crack tip and is the key to studying crack growth and fatigue life. If the cracks are not found in time, they will cause fracture failure in the thick-walled cylinders and possibly even damage mechanical equipment therefore, inner surface cracks on the interface of MRWCs need to be studied. The cracks propagate gradually under tangential stress, which is produced by the contact pressure of interference fits or additional applied loads. As a result of material defects, microspores in the manufacturing process, or defects in the assembly process, the inner surfaces of thick-walled cylinders are prone to produce micro-cracks that are difficult to detect. ![]() In this structure, the inner surface of the external layer of the thick cylinder, which matches the internal layer of the cylinder, is the inner surface of the interface. MRWCs have a nested connection with several thick-walled cylinders with different diameters through an interference fit. Multi-layered, rotating, thick-walled cylinders (MRWCs) are widely used in engineering applications, such as mechanical shafts, multi-barrel rotary guns in weapons, automobile hubs, and revolving pipeline equipment in the petrochemical industry. Finally, 2D finite element models of the four-layer cylinder with a crack are established to verify the equation. Next, the weight function is used to calculate the stress intensity factor for radial penetrating cracks on the inner surface of the cylinder’s interface. Then, the equation of the stress intensity factor is fitted with the parameters of contact pressure, crack depth, and wall thickness ratio. First, finite element software is used to calculate the stress intensity factors of two thick-walled cylinders under an interference fit with a crack on the interface. The parameters included in the equation are the rotation speed, the wall thickness ratio, and the interference. Considering that no relatively accurate model exists for the cracks on the interface of multi-layered, rotating, thick-walled cylinders, in this paper, the stress intensity factor is established for a radial penetrating crack on the interface of a multi-layered, rotating, thick-walled cylinder. Cracks often appear on the inner surface of metal thick-walled cylinders with multiple interference fits. ![]()
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