Abstract:The generalized cumulative model of wear is employed to solve the tribocontact problem for plain bearings where journals have small lobing (ovality, trilobing, tetralobing). The case of mixed-area contact interaction between the shaft and bush is examined. The study investigates the effect of lobing both on variations in the maximum contact pressures during a full revolution of the shaft and on bearing durability. Regularities concerning this effect are determined. It was found that lobing causes a significant… Show more
“…The solution method consists of determining the maximum contact pressure, the contact angle and distribution of pressures in the contact sphere. The equation of contact pressures p in the case of symmetric contact against the external loading of the components in the layout shall be in the form [11][12][13]:…”
Section: Solution Methodsmentioning
confidence: 99%
“…The approximate solution of the equation ( 1) is achieved by the collocation method. The function of contact pressures p is presented in the form of [12][13][14][15][16]:…”
Section: Solution Methodsmentioning
confidence: 99%
“…In this dissertation, the results of numerical analysis of hip endoprosthesis using the original method are presented. Such methods as the solution method of contact in theory of resilience was used in order to assess the parameters of contact between the circular bodies of similar diameters occurring in an internal contact point [10][11][12][13].…”
Total hip arthroplasty is a complex procedure. The achievements of implantology enabled the development of a faithful representation of hip joint physiology as well as the production of materials that can successfully replace damaged natural tissues. A very important issue is the correct selection of the geometry of the endoprosthesis adequate to the load of the joint. Materials used for endoprosthesis are a metal head and a polymer cup (e.g. PE-UHMW). The main interactions in the endoprosthesis are friction and surface pressure, which must be limited, exceeding them causes the destruction of the biomechanical system - plastic deformation of the polymer and the formation of too large and unacceptable radial clearances. Based on the author's developed calculation method of hip joint endoprosthesis contact parameters, the impact on maximum contact pressure and the angle of contact of the joint load was estimated depending on the diameter of the endoprosthesis and radial clearance. The correctness of changing the values of maximum contact pressure from the mentioned parameters was determined. Correspondingly: an increase in joint load causes a linear increase in the maximum contact pressure; increasing the diameter of the endoprosthesis head - their non-linear decrease, and increasing radial clearance - their increase
“…The solution method consists of determining the maximum contact pressure, the contact angle and distribution of pressures in the contact sphere. The equation of contact pressures p in the case of symmetric contact against the external loading of the components in the layout shall be in the form [11][12][13]:…”
Section: Solution Methodsmentioning
confidence: 99%
“…The approximate solution of the equation ( 1) is achieved by the collocation method. The function of contact pressures p is presented in the form of [12][13][14][15][16]:…”
Section: Solution Methodsmentioning
confidence: 99%
“…In this dissertation, the results of numerical analysis of hip endoprosthesis using the original method are presented. Such methods as the solution method of contact in theory of resilience was used in order to assess the parameters of contact between the circular bodies of similar diameters occurring in an internal contact point [10][11][12][13].…”
Total hip arthroplasty is a complex procedure. The achievements of implantology enabled the development of a faithful representation of hip joint physiology as well as the production of materials that can successfully replace damaged natural tissues. A very important issue is the correct selection of the geometry of the endoprosthesis adequate to the load of the joint. Materials used for endoprosthesis are a metal head and a polymer cup (e.g. PE-UHMW). The main interactions in the endoprosthesis are friction and surface pressure, which must be limited, exceeding them causes the destruction of the biomechanical system - plastic deformation of the polymer and the formation of too large and unacceptable radial clearances. Based on the author's developed calculation method of hip joint endoprosthesis contact parameters, the impact on maximum contact pressure and the angle of contact of the joint load was estimated depending on the diameter of the endoprosthesis and radial clearance. The correctness of changing the values of maximum contact pressure from the mentioned parameters was determined. Correspondingly: an increase in joint load causes a linear increase in the maximum contact pressure; increasing the diameter of the endoprosthesis head - their non-linear decrease, and increasing radial clearance - their increase
“…The influence of cylindricity on the performance of journal bearings has been investigated considerably. 3–5 However, the effect of cylindricity on the performance of interference fitted assemblies does not appear to have been studied in detail, and this paper is an attempt in that direction. Figure 1.Illustration of cylindricity deviation.…”
Interference fits are commonly used in engineering for various applications. While the effect of many factors on the load-carrying ability of interference fits has been studied extensively, the combined effect of cylindricity, roundness and roughness does not appear to have been considered to that extent, and this paper is an attempt to remedy the situation. As a first step, finite element method was used to verify that there will be a reduction in the load-carrying ability due to the introduction of perfect geometrical deviations on the shaft. Thereafter, a detailed experimental investigation was carried out to study the effect of cylindricity and their joint effect with various other factors on the axial load-carrying ability of shaft–bearing interference fitted assemblies. A number of shafts of C40 steel of nominal diameter 20 mm were manufactured with varying cylindricity values and selectively assembled with standard deep grove ball bearings, thereby achieving interference fits with a grade of H7/u6 between them. The assembled specimens were tested on a Universal Testing Machine with a specially made fixture and the maximum extraction load determined. The effect of the various factors on the extraction load was examined using statistical methods. It was found that shaft cylindricity error did reduce the load-carrying ability of interference fits. The combination of interference, cylindricity and surface roughness was found to give the best prediction for extraction load. Certain other parameters were also examined, but they were not found significant.
“…In the contemporary stage of engineering the optimal design of the friction pair, details providing an increase of efficiency of friction pairs are of great value [7–31]. The theoretical analysis on the determination of interference of the jointed cylinder, providing minimization of the abrasive wear of the friction unit, was carried out by Gadzhiev and Mirsalimov [7].…”
Methods of fracture mechanics enable a new approach to the design of structures, ensuring prevention of crack development. The plane problem of mechanics of contact fracture for the hub of a friction pair during operation is studied. It is accepted that near the rough friction surface, the hub has a rectilinear crack. A criterion and a method for solving the inverse problem of the mechanics of contact fracture on definition of the function of displacements of external contour points of the hub of a friction pair with regard to temperature drop and inequalities of the contact surface in friction pair components is given. The found function of displacements of the external contour points of the hub provides an increase of the load-bearing capacity of the hub of a friction pair. The problem of prevention of the fracture of the hub of a friction pair with allowance for the real friction surface was first posed and then solved.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
