Abstract
Number of important engineering components and elements such as gears, rollers, bearings operate in conditions of rolling-sliding contact loading. Determination of fatigue lives of such components and elements is very important for engineering practice but remains quite chalenging task due to complex states of stress and strain in the material in the vicinity of contact (multiaxiality, non-proportionality, rotation of principal axes, mean compressive stress) as well as complex contact conditions such as loading amplitude, complex geometry of bodies in contact, type of lubrication, value of coefficient of friction, etc. Proposed fatigue life calculation model for cases of rolling-sliding contact is based on critical plane approach in the form of Fatemi-Socie crack initiation criterion. Developed model was implemented in the case of gears teeth flanks in mesh and compared with results and fatigue lives of gears reported in literature. Good agreement was determined confirming validity of developed model. Further advantage of presented approach and developed model is obtained information on critical location(s) and critical plane(s) orientation which can subsequently be used for estimation of crack shapes in initial phases of their growth and later damage type into which they can be expected to develop.
Highlights
Rolling-sliding contact loading and fatigue, remain significant problems and relevant research topics since a number of important components and elements such as gears, rollers, bearings operate in these conditions
Main factor that additionaly contributes to the complexity is variable and difficult to determine loading cycle which is further influenced by significant number of conditions and parameters such as variable loading amplitude, complex geometry of bodies in contact, type of lubrication and value of coefficient of friction
One of the main chalenges for determination of load capacity and fatigue lives and aleviation or avoidance of fatigue damage of components and elements operating in rolling-sliding contact conditions, is precise and correct characterization and calculations of stresses and strains and their evolutions during cycle(s) of rolling-sliding contact loading and properly taking into account numerous external and internal influences that affect it
Summary
Rolling-sliding contact loading and fatigue, remain significant problems and relevant research topics since a number of important components and elements such as gears, rollers, bearings operate in these conditions. These components are highly loaded and due to cyclic transmission of motion and loading/power are prone to damage caused by material fatigue, especially in the surface layer close to the area of contact. Determination of fatigue life of these components is still quite a chalenging task since this particular type of loading causes complex states of stress and strain in the material in the vicinity of area of contact featuring multiaxiality, non-proportionality, rotation of. In order to extend their durability and fatigue life, further highly variable factors such as material properties and their variability due to different heat and surface treatments need to be taken into account. [1, 3, 4, 5]
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