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Chapter and Conference Paper
Creep, Fatigue, and Oxidation Interactions During High and Very High Cycle Fatigue at Elevated Temperature of Nickel-Based Single Crystal Superalloys
High-temperature of Ni-based single crystal is studied at 1000 °C in a wide range of loading conditions (−1 ≤ R ≤ 0.8) and number of cycles (103 − 109). Under fully reversed conditions, a competition between ...
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Article
Alloy Design and Processing Design of Magnesium Alloys Using 2nd Phases
Two phases dominate the performance of commercial Mg alloys: (1) β Mg17Al12 and (2) porosity. Alloy design and process design to optimize the morphology of the first and to minimize the second are discussed. Sec...
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Article
PRISMS: An Integrated, Open-Source Framework for Accelerating Predictive Structural Materials Science
The Center for Predictive Integrated Structural Materials Science (PRISMS Center) is creating a unique framework for accelerated predictive materials science and rapid insertion of the latest scientific knowle...
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Article
Phylogenetic and taxonomic assessment of the endangered Cumberland bean, Villosa trabalis and purple bean, Villosa perpurpurea (Bivalvia: Unionidae)
Inadequate understanding of the phylogeography, taxonomy, and historical distribution of two critically imperiled freshwater mussels, Cumberland bean, Villosa trabalis, and purple bean, Villosa perpurpurea, has h...
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Article
Open AccessEngineering solutions for food-energy-water systems: it is more than engineering
Food, energy, and water systems interact extensively, giving rise to the term “food-energy-water (FEW) nexus,” with the term “nexus” signifying connectedness and interrelationships. A systems approach involvin...
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Chapter
Solidification and Microstructure of Mg — Al — (Ca, Sr, Ce, La) Ternary Alloys
Solidification behavior and as-cast microstructure have been analyzed in a series of ternary Mg alloys consisting of Mg — Al — X: (Ca, Sr, Ce, La). Thermodynamic calculations of the Mg — Al — Ca, Mg — Al -Sr, ...
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Chapter
Microstructure Characterization of Weakly Textured and Fine Grained AZ61 Sheet
Formability in magnesium alloy sheet is strongly limited by a strong basal texture in the as-rolled material, which is difficulty to remove by thermal processing. We introduce a new process to the control of t...
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Chapter
Microstructure Modification and Deformation Behavior of Fine Grained AZ61L Sheet Produced by Thixomolding® and Thermomechanical Processing
X-ray diffraction and hardness measurements are used to study recrystallization in fine-grained AZ61L sheet produced by warm-rolling of Thixomolded® material. The as-rolled sheet is partially dynamically-recry...
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Chapter
Microstructure Evolution in AZ61L During TTMP and Subsequent Annealing Treatments
Microstructure evolution is studied in Thixomolded® Thermomechanical Processed (TTMP) AZ61L sheet at various stages of processing. Transmission electron microscopy (TEM) is utilized to examine (1) grain refine...
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Chapter
Effect of Microstructure on Deformation and Fracture of Thixomolded and Thermomechanically Processed AZ61
This paper investigates the deformation, damage accumulation and fracture behavior of fine-grained AZ61 sheet produced by combined Thixomolding and Thermomechanical (TTMP) processing. In the TTMP process, warm...
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Chapter
Fatigue Behavior of Thixomolded® Magnesium AZ91D Using Ultrasonic Techniques
The fatigue behavior of the Thixomolded® magnesium alloy AZ91D has been examined using ultrasonic fatigue testing techniques at frequencies of approximately 20 kHz and for lifetimes as long as 109 cycles. An appa...
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Article
Nitrogen and phosphorus fertilization with crop residue retention enhances crop productivity, soil organic carbon, and total soil nitrogen concentrations in sandy-loam soils in Ghana
Sustainable management practices are needed to enhance soil organic carbon (SOC) in degraded soils in semi-arid West Africa. We studied the effects of three amounts of nitrogen (N) (0, 60 and 120 kg N ha−1) and t...
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Article
Erratum to: Modeling organic carbon and carbon-mediated soil processes in DSSAT v4.5
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Article
Uncertainty in simulating wheat yields under climate change
Large standardized model intercomparison projects enable the quantification of uncertainty in projecting the impacts of climate change. One of the largest studies so far indicates that individual crop models a...
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Article
Design optimisation using computational fluid dynamics applied to a land–based supersonic vehicle, the BLOODHOUND SSC
This paper details the computational design optimisation strategy employed to achieve an engineering solution to the problem of excessive supersonic lift at the rear of the BLOODHOUND SSC (SuperSonic Car) duri...
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Article
The Role of Local Microstructure on Small Fatigue Crack Propagation in an α + β Titanium Alloy, Ti-6Al-2Sn-4Zr-6Mo
Microstructural origins of the variability in fatigue lifetime observed in the high- and very-high-cycle fatigue regimes in titanium alloys were explored by examining the role of microstructural heterogeneity ...
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Article
Modeling organic carbon and carbon-mediated soil processes in DSSAT v4.5
Crop** systems models have evolved over the last four decades in response to the demand for modeling to address more complex questions, including issues on sustainable production, climate change, and environ...
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Article
Open AccessMicrostructural Influences on Very-High-Cycle Fatigue-Crack Initiation in Ti-6246
The fatigue behavior of an alpha + beta titanium alloy, Ti-6Al-2Sn-4Zr-6Mo, has been characterized in the very-high-cycle fatigue (VHCF) regime using ultrasonic-fatigue (20 kHz) techniques. Stress levels (σ ...
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Article
Effect of Frequency, Environment, and Temperature on Fatigue Behavior of E319 Cast Aluminum Alloy: Stress-Controlled Fatigue Life Response
The fatigue stress-life (S-N) behavior of E319 cast aluminum alloy was studied by using both ultrasonic and conventional fatigue techniques in order to understand the potential effect of frequency on fatigue b...
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Article
Open AccessEffect of Frequency, Environment, and Temperature on Fatigue Behavior of E319 Cast-Aluminum Alloy: Small-Crack Propagation
The influence of test frequency on fatigue-crack propagation behavior of small cracks in E319 cast-aluminum alloy was studied using ultrasonic and conventional test techniques. It was observed that fatigue cra...
