Frictional half-plane contacts in partial slip in the steady-state
<p>This thesis aims to understand how a number of real contact problems respond to local contact loads during cyclic loading and which combination of loads will give rise to a state of partial slip. At the core of this thesis lies a family of partial slip solutions for half-plane contact probl...
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| Format: | Abschlussarbeit |
| Sprache: | English |
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2020
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| _version_ | 1826291744486981632 |
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| author | Andresen, HN |
| author2 | Hills, D |
| author_facet | Hills, D Andresen, HN |
| author_sort | Andresen, HN |
| collection | OXFORD |
| description | <p>This thesis aims to understand how a number of real contact problems respond to local contact loads during cyclic loading and which combination of loads will give rise to a state of partial slip. At the core of this thesis lies a family of partial slip solutions for half-plane contact problems subject to different forms of periodic loading. This collection of partial slip solutions allows engineers and researchers alike to assess rapidly the contact behaviour, namely the position and extent of the zones of relative cyclic motion along the interface. While knowing the slip stick pattern, by itself, does not answer the question of whether an assembly is prone to fretting fatigue or not, it enables the user to set up simple laboratory experiments in order to determine the fretting fatigue strength of the design under consideration. </p>
<p>The thesis begins with a taxonomy of the different classes of contacts that can arise in mechanical assemblies. In many fretting fatigue problems, we encounter one particular contact class, the so-called incomplete contact, which is suited for being represented by half-planes. After exploring the properties and limitations of plane elasticity and half-plane theory, we look at half-plane partial slip contact problems under different types of loading. We will make use of three different solution approaches (a) an analytical description using a superposition of full sliding shear tractions, (b) an analytical description using glide dislocations starting from a fully adhered state, and (c) an asymptotic description of the contact edge behaviour. Where suitable, the research results are applied to example geometries in order to familiarise the reader with the methodologies presented. The thesis concludes with the proposal of a generalised approach to fretting fatigue strength utilising experimental results published in the literature. The test data is reinterpreted by applying the outlined asymptotic methods in order to provide generality and comparability across different geometries and loading scenarios. </p> |
| first_indexed | 2024-03-07T03:04:02Z |
| format | Thesis |
| id | oxford-uuid:b1e8b1f2-bef4-44b8-93fb-87c4ff7134ae |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:04:02Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | oxford-uuid:b1e8b1f2-bef4-44b8-93fb-87c4ff7134ae2022-03-27T04:07:42ZFrictional half-plane contacts in partial slip in the steady-stateThesishttp://purl.org/coar/resource_type/c_db06uuid:b1e8b1f2-bef4-44b8-93fb-87c4ff7134aeaerospeace engineeringapplied mechanicscontact mechanicsEnglishHyrax Deposit2020Andresen, HNHills, D<p>This thesis aims to understand how a number of real contact problems respond to local contact loads during cyclic loading and which combination of loads will give rise to a state of partial slip. At the core of this thesis lies a family of partial slip solutions for half-plane contact problems subject to different forms of periodic loading. This collection of partial slip solutions allows engineers and researchers alike to assess rapidly the contact behaviour, namely the position and extent of the zones of relative cyclic motion along the interface. While knowing the slip stick pattern, by itself, does not answer the question of whether an assembly is prone to fretting fatigue or not, it enables the user to set up simple laboratory experiments in order to determine the fretting fatigue strength of the design under consideration. </p> <p>The thesis begins with a taxonomy of the different classes of contacts that can arise in mechanical assemblies. In many fretting fatigue problems, we encounter one particular contact class, the so-called incomplete contact, which is suited for being represented by half-planes. After exploring the properties and limitations of plane elasticity and half-plane theory, we look at half-plane partial slip contact problems under different types of loading. We will make use of three different solution approaches (a) an analytical description using a superposition of full sliding shear tractions, (b) an analytical description using glide dislocations starting from a fully adhered state, and (c) an asymptotic description of the contact edge behaviour. Where suitable, the research results are applied to example geometries in order to familiarise the reader with the methodologies presented. The thesis concludes with the proposal of a generalised approach to fretting fatigue strength utilising experimental results published in the literature. The test data is reinterpreted by applying the outlined asymptotic methods in order to provide generality and comparability across different geometries and loading scenarios. </p> |
| spellingShingle | aerospeace engineering applied mechanics contact mechanics Andresen, HN Frictional half-plane contacts in partial slip in the steady-state |
| title | Frictional half-plane contacts in partial slip in the steady-state |
| title_full | Frictional half-plane contacts in partial slip in the steady-state |
| title_fullStr | Frictional half-plane contacts in partial slip in the steady-state |
| title_full_unstemmed | Frictional half-plane contacts in partial slip in the steady-state |
| title_short | Frictional half-plane contacts in partial slip in the steady-state |
| title_sort | frictional half plane contacts in partial slip in the steady state |
| topic | aerospeace engineering applied mechanics contact mechanics |
| work_keys_str_mv | AT andresenhn frictionalhalfplanecontactsinpartialslipinthesteadystate |