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oai:www.ideals.illinois.edu:2142/18223 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Sofronis, Petros Schebler, Gregory J. 2011-01-14T22:40:27Z 2011-01-14T22:40:27Z 2013-02-10T11:00:16Z 2011-01-14T22:40:27Z This thesis presents a model to simulate the effects of hydrogen on the mechanical behavior of single crystals. A macroscopic crystal plasticity model is formulated based on the fundamentals of the hydrogen-dislocation interactions. Various hardening evolution equations are investigated and employed in a physically-based model. The presence of hydrogen is incorporated into the constitutive relations through basic equations to simulate its effects on dislocation activation, multiplication, and annihilation. The crystal plasticity model is then implemented in a computationally realizable solution to the single crystal uniaxial tension problem. The present model is designed within a crystal plasticity framework for an FCC single crystal. Features that incorporate the hydrogen effect into the constitutive model have been designed to directly capture observed effects in single crystals. Experimental data available in uniaxial tension for single crystal nickel specimens are used to calibrate the model. The sensitivities of the model are investigated through varying the magnitudes of the parameters controlling the mechanical behavior and how it is influenced by the presence of hydrogen. Through this study, a constitutive theory on how hydrogen affects the deformation is proposed and areas of further research are discussed. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-09-02T15:18:36Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Schebler_Gregory.doc: 2220544 bytes, checksum: 587f44e4e2c38ea7d5c6b8a9e8482c38 (MD5) Schebler_Gregory.pdf: 995914 bytes, checksum: 328febafd6aaccdf4ec6599ba623d5f0 (MD5) Made available in DSpace on 2011-01-14T22:40:27Z (GMT). No. of bitstreams: 3 Schebler_Gregory.pdf: 995914 bytes, checksum: 328febafd6aaccdf4ec6599ba623d5f0 (MD5) license.txt: 4071 bytes, checksum: 4f683c635f60be9fc648456a879d35a8 (MD5) Schebler_Gregory.doc: 2220544 bytes, checksum: 587f44e4e2c38ea7d5c6b8a9e8482c38 (MD5) Item marked as restricted to the 'Administrator' Group (id=1) by Sarah Shreeves (sshreeve@illinois.edu) on 2011-02-09T15:20:46Z Item is restricted until 2013-02-09T15:20:46Z Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2013-02-10T11:00:15Z Item was in collections: University of Illinois Dissertations and Theses (ID: 204) Dissertations and Theses - Mechanical Science and Engineering (ID: 675) No. of bitstreams: 4 Schebler_Gregory.pdf: 995914 bytes, checksum: 328febafd6aaccdf4ec6599ba623d5f0 (MD5) license.txt: 4071 bytes, checksum: 4f683c635f60be9fc648456a879d35a8 (MD5) Schebler_Gregory.doc: 2220544 bytes, checksum: 587f44e4e2c38ea7d5c6b8a9e8482c38 (MD5) Schebler_Gregory.pdf.txt: 105406 bytes, checksum: 82d9f1cd16e0798f2ab0498371e508d8 (MD5) Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2013-02-10T11:00:16Z http://hdl.handle.net/2142/18223 en Copyright 2010 Gregory J. Schebler hydrogen crystal plasticity dislocation nickel tension On the mechanics of the hydrogen interaction with single crystal plasticity 2010-12 Mechanical Sci & Engineering 1917 Theoretical & Applied Mechans 0242 University of Illinois at Urbana-Champaign Thesis M.S. MS:Theor&Appl Mechanics -UIUC 10KS0242MS