Materials Literature
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Summary of results for (a) Young’s modulus and (b) tensile strength.Theerrorbarsindicatestandarddeviations. strength.Thissetofexperimentshighlightsthemaincharacteristics ofthefishscale’scomponents:thebonylayerisstiff,hardandbrittle becauseofitshigh mineral content, while theunderlyingcollagen cross-plyissofterandmoredef…
NO₂ is much more toxic than NO. The average proportion of NO₂ in exhaust gases of vehicles increases significantly due to the use of oxidation catalysts and catalytic coatings in the exhaust gas systems during the last decades combined with generalization of using low sulfur fuels. Diesel oxidation catalysts (DOC) and…
In this project, phenomena in a SCR catalyst, such as heat transfer and catalytic reactions, are modeled numerically. The model is simplified to be integrated on an electronic control unit. The calibration process for this model has been developed, which is performed on gas bench and validated on a vehicle equipped wi…
The successful design and especially the control of the SCR system is a challenging process that can be supported by the application of simulation tools. As a first step, we employ physico-chemically informed ‘off-line’ models that are calibrated with the help of targeted small- and full-scale tests. Despite their hig…
We characterize the cyclic behavior of an AM30 extruded magnesium alloy. The micromechanisms of cyclic damage were studied by means of strain controlled experiments in both the extruded and transverse directions. A scanning electron microscope (SEM) analysis of the microstructure revealed that second phase particles w…
A widely tunable optical filter was designed and demonstrated by configuring two spatially distributed cholesteric liquid crystals (LCs) in a reflection mode, in which the incident light was first reflected by one cholesteric LC and then by the other. The spatially distributed cholesteric LCs were fabricated by inject…
Abstract Polymers are being applied increasingly in the field as more environmentally acceptable alternatives to phosphonates for inhibition of common mineral scales. However, the systematic design and optimization of these compounds by traditional experimental methodologies can be complicated by several factors. The…
The presented work describes how numerical modeling techniques were extended to simulate a full Selective Catalytic Reduction (SCR) NOx aftertreatement system. Besides predicting ammonia-to-NOX ratio (ANR) and uniformity index (UI) at the SCR inlet, the developed numerical model was able to predict NOx reduction and a…
With forthcoming 2014 EPA GHG legislation capping methane emissions at 0.10 g/bhp-hr for heavy-duty engines, development of a thermally stable and sulfur-tolerant methane oxidation catalyst becomes more critical. This is particularly true for natural gas-powered engines where methane slip is a significant contributor…
Flexible aluminum‐doped silicon carbide ( S i C ( A l)) fibrous mats were synthesized by combining electrospinning and polymer‐derived ceramic techniques. The mats consist of three‐dimensional network structure with randomly distributed fibers of approximately 1.5 μm diameter. The obtained mats exhibited simultaneous…
Advanced high strength steels (AHSS) are widely used in the automotive industry for various applications especially for structural and safety parts. One of the concerns for AHSS in stamping operations is edge fracture originating from sheared blanked edges. This type of failure cannot be predicted by computer simulati…
The regeneration process of a Diesel Particulate Filter (DPF) consists of an increase in the engine exhaust gas temperature by using post injections and/or exhaust fuel injection during a period of time in order to burn previously trapped soot. The DPF regeneration is usually performed during a real drive cycle, with…
Worldwide emissions standards are becoming increasingly rigorous, and this leads to more complex engine demands. Several new PCU (Power Cell Unit) technologies are being applied to cope with these demands. This means engine parameters are changing, e.g. higher EGR (Exhaust Gas Recirculation) rates, higher PCP (Peak Cy…
Abstract pH is one of the most important parameters for evaluating the scale and corrosion potential of the water during oil and gas production. The effectiveness of chemical treatment can also be influenced by pH in the production tubing and reservoir. Unfortunately, pH is not a conservative parameter that can be det…
This article aims to demonstrate the effects of using different boundary conditions and different computational volume dimensions in numerical simulations of periodic metamaterial arrays. A double band metamaterial unit cell design will be utilized to show that use of different boundary conditions may result in simula…
A typical diesel exhaust emission control system for meeting the US EPA 2010 regulations includes one or more platinum-group metal (PGM)-containing catalysts, located upstream of an SCR unit. However, as was previously reported in literature, under certain operating conditions PGM elements can get transferred onto the…
To meet the stringent emission regulations on diesel engines, engine-out emissions have been lowered by adapting new combustion concepts such as low-temperature combustion and after-treatment systems have also been used to reduce tailpipe emissions. To optimize the control of both in-cylinder combustion and the effici…
Titanium alloys are widely used in the aerospace and power generation industries due to their high specific strength and corrosion resistance. Titanium alloys like the modern (α +β) titanium alloy Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) are difficult to machine due to the formation of long chips which hinders automated manufactu…
Using ab-initio simulations, we investigated the effects of ferroelectric polarization on the magnetic anisotropy of FePt/BaTiO3 heterojunctions. The changed electronic structure at the interface of FePt and BaTiO3 reduced the magnetic anisotropy energy (MAE) under ferroelectric polarization. Through the electronic de…
Despite drastic reduction of sulfur content in diesel fuel in the recent years, especially with the introduction of Ultra-Low Sulfur Diesel (ULSD), sulfur poisoning remains one of the most significant factors impacting performance of various catalysts in diesel aftertreatment systems. This is because even with ULSD, c…