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Microstructure design of a two phase composite using two-point correlation functions
This work has been funded under the AFOSR Grant no. F49620-03-1-0011 and Army Research Lab contract no. DAAD17-02-P-0398 and DAAD 19-01-1-0742. Two-point distribution functions are used here as to introduce "Microstructure Sensitive Design" in...
Institutional Repository

Spectral Integration of Microstructure and Design
Support of the Army Research Office is greatly appreciated. Mechanical design can be conducted in a framework where consideration of microstructure as a continuous design variable is facilitated by the use of a Fourier space. Selection of the...
Institutional Repository

Advances in Experimental Method and Analysis for Estimation of Geometrically-Necessary Dislocations
The authors wish to thank The Alcoa Technical Research Center for supplying the specimens and performing the compression tests. This work was supported by the MRSEC program of the National Science Foundation under DMR-0079996 as well as Lawrence...
Institutional Repository

A texture evolution model in cubic-orthotropic polycrystalline system
This work has been funded under the AFOSR Grant # F49620-03-1-0011 and Army Research Lab Contract # DAAD17-02-P-0398 and DAAD 19-01-1-0742. B.L. Adams acknowledges support of Army Research Office, Proposal No. 42566-MS. The authors express their...
Institutional Repository

Effects of Friction Stir Welding on Polymer Microstructure
friction stir welding, polymer structure, plastic welding, plastic joining, polymer microstructure, microstructure,
This work establishes the relationships between several key Friction Stir Welding process parameters and the resulting microstructural and flexural properties of the welded joint. A series of four single parameter experiments were run. The...
ETD

Statistical Continuum Theory for Inelastic Behavior of a Two-Phase Medium
This work was supported in part (B.L. Adams) by the MRSEC Program of the National Science Foundation under Award no. DMR-9632556. Further support was provided by the Center for Materials Research and Technology (MARTECH at FSU) and Center for...
Institutional Repository

Effects of Friction Stir Processing on the Microstructure and Mechanical Properties of Fusion Welded 304L Stainless Steel
friction stir welding, friction stir processing, austenitic stainless steel, microstructure, sigma, fatigue, corrosion, stress corrosion cracking
Friction stir processing (FSP) has been utilized to locally process regions of arc weldments in 304L stainless steel to improve the microstructure and mechanical performance. The cast microstructure and coarse delta-ferrite has been replaced with...
ETD

Object Oriented CAE Software for the Exploration and Design of Microstructures
mechanical behavior, MSD, microstructure, mechanical design, turbine
Through the use of generalized spherical harmonic basis functions a spectral representation is used to model the microstructure of cubic materials. This model is then used to predict the macroscopic elastic and plastic properties of materials with...
ETD

Bounding Elastic Constants of an Orthotropic Polycrystal using Measurements of the Microstructure
We show how information about the elastic stiffness and compliance of an orthotropic polycrystal may be obtained from measurements of the statistical properties of the microstructure. We begin by discussing the statistical properties of the...
Institutional Repository

Microstructure-sensitive design of a compliant beam
BA acknowledges financial support provided by the MRSEC Program of the National Science Foundation under Award Number DMR-9632556. SK acknowledges financial support from National Science Foundation under Award Number CMS-9732699. BA, SK and HG also...
Institutional Repository

Investigation of Heterogeneity of FSW Inconel 718 Coupled with Welding Thermal Cycle
Friction Stir Welding (FSW), 3D Strain Model, Inconel 718, FSW thermal history, microstructure, and FSW properties
In order to develop a better understanding of the property, microstructure evolution and thermal history of FSW Inconel 718’s, the strain, strain rate and thermal cycles need to be determined. In order to estimate the strain field of a deformed...
ETD

Microstructure sensitive design of an orthotropic plate subjected to tensile load
Financial support for this work was provided by the Army Research Office, Proposal No. 42566-MS, Dr. David Stepp, Program Director and Army Research Lab, Dr. Scott Schoenfeld, Point of Contact. Microstructure Sensitive Design (MSD) is a newly...
Institutional Repository

Microstructure and Transport Properties of Porous Li-ion Electrodes
electrochemistry, monte carlo, structure reconstruction, FIB imaging
The goal of this work is to understand the relationships between electrode microstructure and mass transport resistances. One can use this information to predict cell performance from fundamental principles. This work includes new types of...
ETD

Microstructure Evolution in 304L Stainless Steel Subjected to Hot Torsion at Elevated Temperature
Jian Lu, friction stir welding FSW, 304L stainless steel, hot torsion, dynamic recovery DRV, continuous dynamic recrystallization CDRX, dislocation structures DSs, low angle boundaries LABs, high angle boundaries HABs
The current study focus on investigating a relationship between processing variables and microstructure evolution mechanism in 304L stainless steel subjected to hot torsion. The Gleeble 3800 with Mobile Torsion Unit (MTU) is utilized in the current...
ETD

Mapping the Mesoscale Interface Structure in Polycrystalline Materials
This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Numbers DMR-9632556 and DMR-0079996. A new experimental approach to the quantitative characterization of polycrystalline microstructure by...
Institutional Repository

Incorporating Functionally Graded Materials and Precipitation Hardening into Microstructure Sensitive Design
microstructure, microstructure sensitive design, MSD, compliant derailleur, Taylor yield theory, Hill elastic bounds, precipitation hardening, optimization, design, elastic, plastic, crystalline
The methods of MSD are applied to the design of functionally graded materials. Analysis models are presented to allow the design of compliant derailleur for a case study and constraints are placed on the design. Several methods are presented for...
ETD

$Using Design of Experiments and Electron Backscatter Diffraction to Model Extended Plasticity...$
Using Design of Experiments and Electron Backscatter Diffraction to Model Extended Plasticity Mechanisms In Friction Stir Welded AISI 304L Stainless Steel
Benjamin Nelson, FSW, 304L, EBSD, recovery, recrystallization, DRV, CDRX, DDRX, DOE
Extended plasticity mechanisms (EPM) allow a metal to undergo extended plastic deformation without failure. These mechanisms are responsible for the extended plastic deformation characteristic of hot working processes. In this thesis it is shown...
ETD

Elasticity in Microstructure Sensitive Design Through the use of Hill Bounds
microstructure sensitive design, elastic properties, Hill bounds, design properties, microstructures, hyper-surfaces, fourier space
In engineering, materials are often assumed to be homogeneous and isotropic; in actuality, material properties do change with sample direction and location. This variation is due to the anisotropy of the individual grains and their spatial...
ETD

Finite approximations to the second-order properties closure in single phase polycrystals
This work was supported at Brigham Young University and Drexel University by a grant from the US Army Research Office, through the Metallurgy Program headed by Dr. David Stepp. Extension of the first-order theory of microstructure design to...
Institutional Repository

Grain-Boundary Structure Effects on Intergranular Stress Corrosion Cracking of Alloy X-750
This work was supported by the Department of Energy under Grant No. DE-FG02-88ER 45355. TO was supported by the National Science Foundation during her 1993-94 stay at the Institute for Advanced Studies (Princeton) under grant DMS-9304580. The...
Institutional Repository

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