Strain heterogeneity during creep of Carrara marble
Thesis: Ph. D. in Geophysics, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2015
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| Online Access: | http://hdl.handle.net/1721.1/95556 |
| _version_ | 1826217239992336384 |
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| author | Quintanilla Terminel, Alejandra |
| author2 | J. Brian Evans. |
| author_facet | J. Brian Evans. Quintanilla Terminel, Alejandra |
| author_sort | Quintanilla Terminel, Alejandra |
| collection | MIT |
| description | Thesis: Ph. D. in Geophysics, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014. |
| first_indexed | 2024-09-23T17:00:12Z |
| format | Thesis |
| id | mit-1721.1/95556 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T17:00:12Z |
| publishDate | 2015 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/955562019-04-10T14:48:33Z Strain heterogeneity during creep of Carrara marble Quintanilla Terminel, Alejandra J. Brian Evans. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Earth, Atmospheric, and Planetary Sciences. Thesis: Ph. D. in Geophysics, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014. Cataloged from PDF version of thesis. Includes bibliographical references (pages 217-226). Creep processes in calcite have been extensively studied, leading to the establishment of deformation mechanism maps. However, flow laws assuming a steady-state and homogeneous creep deformation cannot describe the strain localization and evolving structure described in numerous experimental and field studies. The micromechanical models need therefore to be revisited, and more experimental work and alternative methods to describe strain evolution are necessary. This work focused on the development of experimental and computational tools to describe strain at a micrometric scale, and their application to creep of Carrara marble. Two experimental series, one varying temperature (T), the other varying strain were performed in compression in a conventional triaxial apparatus (Paterson Instruments) at 300 MPa, T=400-700°C strain rate of 3 x 10 5 s- 1 and strains of 0.11, 0.22 and 0.36. Chapters 2 and 3 describe the microfabrication and computation technique developed for mapping deformation at a microscale. Chapter 4 describes the development of strain heterogeneity in the experimental series and Chapter 5 provides a complementary crystallographic analysis and preliminary work regarding modeling of the strain field. The experiments document a progressive transition as temperature increases from 400°C to 700°C , from a regime where twinning is an important mechanism of strain accommodation towards an increasing activity of intracrystalline slip systems. This transition is accompanied by a change in length scale of strain heterogeneity. At low T, strain is localized in bands spanning several grains. At high T, strain is more localized along grain boundaries. Furthermore, the wavelength of heterogeneities decreases to a quarter of the grain size, in parallel with an increase in their amplitude. This evolution is also seen at a grain scale and is accompanied by a greater change in crystallographic preferred orientation with respect to the undeformed natural sample, both at the low T and high T end-members of the series. The wavelengths of heterogeneities decrease with strain, suggesting the microstructure has not reached steady state despite a trend towards a local homogenization. This work provides a quantitative analysis of the evolution of intra- and intergranular strain partition, and gives a first insight into the adequate formulation of the evolving parameters in a constitutive law of creep deformation. by Alejandra Quintanilla Terminel. Ph. D. in Geophysics 2015-02-25T17:09:50Z 2015-02-25T17:09:50Z 2014 2014 Thesis http://hdl.handle.net/1721.1/95556 903533172 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 226 pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Earth, Atmospheric, and Planetary Sciences. Quintanilla Terminel, Alejandra Strain heterogeneity during creep of Carrara marble |
| title | Strain heterogeneity during creep of Carrara marble |
| title_full | Strain heterogeneity during creep of Carrara marble |
| title_fullStr | Strain heterogeneity during creep of Carrara marble |
| title_full_unstemmed | Strain heterogeneity during creep of Carrara marble |
| title_short | Strain heterogeneity during creep of Carrara marble |
| title_sort | strain heterogeneity during creep of carrara marble |
| topic | Earth, Atmospheric, and Planetary Sciences. |
| url | http://hdl.handle.net/1721.1/95556 |
| work_keys_str_mv | AT quintanillaterminelalejandra strainheterogeneityduringcreepofcarraramarble |