An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/33162 |
| _version_ | 1811071686770950144 |
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| author | Ames, Nicoli M. (Nicoli Margret), 1978- |
| author2 | Lallit Anand. |
| author_facet | Lallit Anand. Ames, Nicoli M. (Nicoli Margret), 1978- |
| author_sort | Ames, Nicoli M. (Nicoli Margret), 1978- |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003. |
| first_indexed | 2024-09-23T08:55:03Z |
| format | Thesis |
| id | mit-1721.1/33162 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T08:55:03Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/331622022-01-13T07:54:36Z An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids Ames, Nicoli M. (Nicoli Margret), 1978- Lallit Anand. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering Mechanical Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003. This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Includes bibliographical references (leaves 91-92). A significant advance in modeling the plastic deformation of amorphous polymers has been made by Parks, Argon, Boyce, Arruda, and their co-workers (e.g. Parks, Argon, & Bagepalli, 1985; Boyce, Parks, & Argon, 1998; Arruda & Boyce, 1993), and by Wu and Van der Giessen (1993). Although these models phenomenologically capture the large deformation elastic-viscoplastic response of these materials in a reasonably accurate manner, they do not adequately account for the creep response of these materials at stress levels below those causing "macro-yield", as well as the Bauschinger-type reverse yielding phenomena at strain levels less than ~ 30% associated with the macro-yield transient. Anand (2003) has recently generalized the model of Anand and Gurtin (2003) to begin to capture these important aspects of these material's mechanical response. In this work, we summarize Anand's three-dimensional theory and then specialize the constitutive equations to an approximate one-dimensional form. Also, we describe our monotonic, cyclic and creep experiments on the amorphous polymeric solid poly(methyl methacrylate) (PMMA), at ambient temperature and stress states under which this material does not exhibit crazing, and we outline detailed procedures for material parameter determination from these experiments. We have implemented the three-dimensional constitutive equations in the finite-element computer program ABAQUS/Explicit (ABAQUS, Inc., 2002), and using this finite-element program, we show numerical results to some representative problems in microindentation, and compare them against corresponding results from physical experiments. by Nicoli Margret Ames. S.M. 2006-06-20T12:52:16Z 2006-06-20T12:52:16Z 2003 2003 Thesis http://hdl.handle.net/1721.1/33162 54631106 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 92 leaves 6267944 bytes 6273494 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Ames, Nicoli M. (Nicoli Margret), 1978- An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids |
| title | An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids |
| title_full | An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids |
| title_fullStr | An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids |
| title_full_unstemmed | An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids |
| title_short | An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids |
| title_sort | internal variable theory for isotropic visco elastic plastic solids application to indentation of amorphous polymeric solids |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/33162 |
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