The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material
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/1721.1/66868 |
| _version_ | 1811091685530140672 |
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| author | Morgan, Stephen Philip |
| author2 | Herbert H. Einstein. |
| author_facet | Herbert H. Einstein. Morgan, Stephen Philip |
| author_sort | Morgan, Stephen Philip |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011. |
| first_indexed | 2024-09-23T15:06:19Z |
| format | Thesis |
| id | mit-1721.1/66868 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T15:06:19Z |
| publishDate | 2011 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/668682019-04-11T10:30:20Z The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material Morgan, Stephen Philip Herbert H. Einstein. 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. 139-143). This research study investigates the cracking processes in a brittle material associated with inclusions of varying shape, orientation and materials. Specifically, this study summarizes a series of uniaxial compression tests on gypsum specimens with varying inclusion materials, shapes and pair configurations using high speed imagery to determine cracking behavior. The inclusions in the study consisted of differing materials, of contrasting Young's Modulus (higher and lower than the matrix), shapes (hexagon, diamond, ellipse), and relative pair orientations (bridging angle). In addition, single ellipse inclusions were tested to investigate the cracking behavior associated with an ellipse inclusion in a brittle material. Similar to previous research regarding the coalescence of cracks propagating from inclusion pairs, the inclusion material did not affect the coalescence patterns. The coalescence behavior trended from indirect or no coalescence, to direct shear coalescence, to combined direct tensile-shear coalescence as the inclusion bridging angle was increased, similar to past studies on circular and square inclusion pairs, as well as flaw pairs. An analogy was proposed relating the debonded inclusion interfaces to corresponding flaw pairs to compare coalescence behavior. Although the general coalescence trends regarding the effect of bridging angle on inclusion pairs were comparable to those of flaw pairs, the coalescence based on a debonded interface representation did not appear to be similar to that of corresponding flaw pairs. Along with previous work conducted by the MIT rock mechanics group, this research provides detailed experimental observations regarding both the cracking and coalescence behaviors of inclusions in a brittle material. by Stephen Philip Morgan. S.M. 2011-11-01T19:55:20Z 2011-11-01T19:55:20Z 2011 2011 Thesis http://hdl.handle.net/1721.1/66868 758167481 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 339 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Civil and Environmental Engineering. Morgan, Stephen Philip The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material |
| title | The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material |
| title_full | The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material |
| title_fullStr | The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material |
| title_full_unstemmed | The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material |
| title_short | The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material |
| title_sort | effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material |
| topic | Civil and Environmental Engineering. |
| url | http://hdl.handle.net/1721.1/66868 |
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