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Stubbins, James F. Pan, Xiao 2015-09-28T14:51:09Z 2015-09-28T14:51:09Z 10000-01-01 2008 2008 X-ray measurements and analysis not only support the hypothesis of the association between critical stress and critical interfacial strength, but also offer a new method to determine the true strain/stress behavior during deformation. This method is called the Universal Micro-structural Geometry-corrected Model (UMGM) in this dissertation. Due to the development of tri-axial stress and severe distortion of grain structure in the necking region, it is a challenge to determine the true strain/stress curve, a critical input in finite element modeling (FEM) analysis. Previous scholars have developed several analytical methods to characterize true strain/stress behavior after necking merely based on geometry correction or direct linear extrapolation. Grounded with experimental data, the UMGM provides empirical validation for these existing methods. Made available in DSpace on 2015-09-28T14:51:09Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3347494.pdf: 3117124 bytes, checksum: 65f967b824674c9132fe6554e80d5b51 (MD5) Previous issue date: 2008 Embargo set by: Seth Robbins for item 87201 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 178 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008. http://hdl.handle.net/2142/85920 (MiAaPQ)AAI3347494 eng Engineering, Materials Science Tensile Fracture Mechanisms of Ferritic/martensitic Structural Materials text Nuclear Engineering Nuclear Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.