An investigation on the Bauschinger effect in titanium alloys for aerospace applications: strain rate and pressure dependence
<p>A comprehensive study of the reverse loading in Ti-6Al-4V hereafter, Ti64 alloys including strain rate and pressure effects (strength differential), is conducted in order to improve the understanding of the deformation mechanisms in Ti64 and characterise its Bauschinger effect.</p> &l...
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| Другие авторы: | |
| Формат: | Диссертация |
| Язык: | English |
| Опубликовано: |
2021
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| _version_ | 1826306987729616896 |
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| author | Constans solé, N |
| author2 | Petrinic, N |
| author_facet | Petrinic, N Constans solé, N |
| author_sort | Constans solé, N |
| collection | OXFORD |
| description | <p>A comprehensive study of the reverse loading in Ti-6Al-4V hereafter, Ti64 alloys including strain rate and pressure effects (strength differential), is conducted in order to improve the understanding of the deformation mechanisms in Ti64 and characterise its Bauschinger effect.</p>
<p>Strain controlled quasi-static, and high strain rate reverse loading tests are performed, providing novel data to conduct a series of explicit finite element (FEA) simulations with the objective to determine the capabilities of widely used constitutive models to predict the material response under cyclic loading.</p>
<p>The analysis of the experimental data shows that the Bauschinger effect (B.E.) in the material is manifested principally as the loss of a distinct transition between elastic and plastic dominated deformation regions (transient softening), leading to the lowering of the plastic work expended during the straining of the material.</p>
<p>The analysis of the strain rate effects on the cyclic response of the material, allows to identify an inversely proportional relationship between strain rate and B.E. as well as a higher prominence of the aforementioned drop in the plastic work when the loading is conducted in the opposite direction to the pre-strain.</p>
<p>The numerical study conducted shows that general, widely used constitutive models calibrated with monotonic data are not able to accurately predict the cyclic loading response of Ti-6Al-4V alloys, proving the importance of the Bauschinger effect as factor to consider in order to obtain reliable models of the material’s response to complex loading.</p> |
| first_indexed | 2024-03-07T06:56:16Z |
| format | Thesis |
| id | oxford-uuid:fe3d9b21-895b-4764-8f10-39c6bc8d5425 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:56:16Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | oxford-uuid:fe3d9b21-895b-4764-8f10-39c6bc8d54252022-03-27T13:34:48ZAn investigation on the Bauschinger effect in titanium alloys for aerospace applications: strain rate and pressure dependenceThesishttp://purl.org/coar/resource_type/c_bdccuuid:fe3d9b21-895b-4764-8f10-39c6bc8d5425Solid mechanicsAerospace engineeringMaterials scienceImpact engineeringEnglishHyrax Deposit2021Constans solé, NPetrinic, NPellegrino, A<p>A comprehensive study of the reverse loading in Ti-6Al-4V hereafter, Ti64 alloys including strain rate and pressure effects (strength differential), is conducted in order to improve the understanding of the deformation mechanisms in Ti64 and characterise its Bauschinger effect.</p> <p>Strain controlled quasi-static, and high strain rate reverse loading tests are performed, providing novel data to conduct a series of explicit finite element (FEA) simulations with the objective to determine the capabilities of widely used constitutive models to predict the material response under cyclic loading.</p> <p>The analysis of the experimental data shows that the Bauschinger effect (B.E.) in the material is manifested principally as the loss of a distinct transition between elastic and plastic dominated deformation regions (transient softening), leading to the lowering of the plastic work expended during the straining of the material.</p> <p>The analysis of the strain rate effects on the cyclic response of the material, allows to identify an inversely proportional relationship between strain rate and B.E. as well as a higher prominence of the aforementioned drop in the plastic work when the loading is conducted in the opposite direction to the pre-strain.</p> <p>The numerical study conducted shows that general, widely used constitutive models calibrated with monotonic data are not able to accurately predict the cyclic loading response of Ti-6Al-4V alloys, proving the importance of the Bauschinger effect as factor to consider in order to obtain reliable models of the material’s response to complex loading.</p> |
| spellingShingle | Solid mechanics Aerospace engineering Materials science Impact engineering Constans solé, N An investigation on the Bauschinger effect in titanium alloys for aerospace applications: strain rate and pressure dependence |
| title | An investigation on the Bauschinger effect in titanium alloys for aerospace applications: strain rate and pressure dependence |
| title_full | An investigation on the Bauschinger effect in titanium alloys for aerospace applications: strain rate and pressure dependence |
| title_fullStr | An investigation on the Bauschinger effect in titanium alloys for aerospace applications: strain rate and pressure dependence |
| title_full_unstemmed | An investigation on the Bauschinger effect in titanium alloys for aerospace applications: strain rate and pressure dependence |
| title_short | An investigation on the Bauschinger effect in titanium alloys for aerospace applications: strain rate and pressure dependence |
| title_sort | investigation on the bauschinger effect in titanium alloys for aerospace applications strain rate and pressure dependence |
| topic | Solid mechanics Aerospace engineering Materials science Impact engineering |
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