Analytical Elastostatic Contact Mechanics of Highly-Loaded Contacts of Varying Conformity
| Autor: | P.M. Johns-Rahnejat, Nader Dolatabadi, Homer Rahnejat |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
conformal contacts
H100 Materials science concentrated counterformal contacts media_common.quotation_subject 02 engineering and technology Conformity sub-surface stresses contact fatigue 0203 mechanical engineering Arthroplasty replacement lcsh:Science micro-pitting media_common business.industry Mechanical Engineering Fatigue testing Structural engineering 021001 nanoscience & nanotechnology Ellipsoid Surfaces Coatings and Films Micro pitting Contact fatigue 020303 mechanical engineering & transports Contact mechanics Shear (geology) inelastic deformation lcsh:Q 0210 nano-technology business |
| Zdroj: | Lubricants Volume 8 Issue 9 Lubricants, Vol 8, Iss 89, p 89 (2020) |
| ISSN: | 2075-4442 |
| DOI: | 10.3390/lubricants8090089 |
| Popis: | In applications requiring high load carrying capacity, conforming contacting pairs with a relatively large contact footprint are used. These include circular arc, Novikov, and Wildhaber gears found, for example, in helicopter rotors. Closely conforming contacts also occur in many natural endo-articular joints, such as hips, or their replacement arthroplasty. The main determining factors in contact fatigue are the sub-surface shear stresses. For highly loaded contacts, classical Hertzian contact mechanics is used for many gears, bearings, and joints. However, the theory is essentially for concentrated counterforming contacts, where the problem is reduced to a rigid ellipsoidal solid penetrating an equivalent semi-infinite elastic half-space. Applicability is limited though, and the theory is often used inappropriately for contacts of varying degrees of conformity. This paper presents a generic contact mechanics approach for the determination of sub-surface stresses, which is applicable to both highly conforming as well as concentrated counterforming contacts. It is shown that sub-surface shear stresses alter in magnitude and disposition according to contact conformity, and lead to the different modes of fatigue failure noted in practice. |
| Databáze: | OpenAIRE |
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