Tensile Fracture Mechanisms of Ferritic/martensitic Structural Materials

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Nuclear Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Pan, Xiao

Contributors dc:contributor

• Stubbins, James F.

• Engineering, Materials Science

Language dc:language

eng

Identifier

(MiAaPQ)AAI3347494

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/85920