Scratch tests : a new way of evaluating the fracture toughness of materials
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2011
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| Online Access: | http://hdl.handle.net/1721.1/64571 |
| _version_ | 1811083252109148160 |
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| author | Akono, Ange-Therese |
| author2 | Franz-Josef Ulm. |
| author_facet | Franz-Josef Ulm. Akono, Ange-Therese |
| author_sort | Akono, Ange-Therese |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011. |
| first_indexed | 2024-09-23T12:29:39Z |
| format | Thesis |
| id | mit-1721.1/64571 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T12:29:39Z |
| publishDate | 2011 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/645712019-04-12T13:25:26Z Scratch tests : a new way of evaluating the fracture toughness of materials New way of evaluating the fracture toughness of materials Akono, Ange-Therese Franz-Josef Ulm. Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. Civil and Environmental Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011. Cataloged from PDF version of thesis. Includes bibliographical references (p. 126-130). This thesis develops, validates and implements a fracture mechanics model for the assessment of the fracture toughness of materials from scratch tests. Dimensional Analysis highlights two major processes at work during scratch tests: plastic yielding and fracture dissipation. An original set-up of controlled laboratory tests on paraffin wax allows us to identify fracture processes as predominant. An analytical model for scratch tests with a rectangular blade and a back-rake angle is then developed. This model applies to linear elastic isotropic brittle materials and links the fracture toughness to the average horizontal and vertical forces recorded in the scratch test, and to the width and depth of the scratch. Finite Element simulation show that the model is highly accurate for back-rake angles smaller than 25'. From the model, an inverse technique to predict the fracture toughness is developed and implemented. This technique is validated for scratch tests on cement paste, Jurassic limestone, red sandstone and Vosges sandstone. and applied to oil cements hydrated at high temperature and pressure. The application shows that the scratch tests is highly reproducible. almost non-destructive, and not more sophisticated than classical strength-of-materials tests; which makes this *old' technique highly attractive for both materials research and industrial applications. by Ange-Therese Akono. S.M. 2011-06-20T15:53:11Z 2011-06-20T15:53:11Z 2011 2011 Thesis http://hdl.handle.net/1721.1/64571 727033228 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 130 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Civil and Environmental Engineering. Akono, Ange-Therese Scratch tests : a new way of evaluating the fracture toughness of materials |
| title | Scratch tests : a new way of evaluating the fracture toughness of materials |
| title_full | Scratch tests : a new way of evaluating the fracture toughness of materials |
| title_fullStr | Scratch tests : a new way of evaluating the fracture toughness of materials |
| title_full_unstemmed | Scratch tests : a new way of evaluating the fracture toughness of materials |
| title_short | Scratch tests : a new way of evaluating the fracture toughness of materials |
| title_sort | scratch tests a new way of evaluating the fracture toughness of materials |
| topic | Civil and Environmental Engineering. |
| url | http://hdl.handle.net/1721.1/64571 |
| work_keys_str_mv | AT akonoangetherese scratchtestsanewwayofevaluatingthefracturetoughnessofmaterials AT akonoangetherese newwayofevaluatingthefracturetoughnessofmaterials |