Browse Topic: Conductivity

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Performance Analysis of Graphene-Coated Heat Pipe Heat Exchangers for Automobile Exhaust Cooling and Purification2025-01-500601/23/2025
This research investigates the development of a heat pipe heat exchanger coated with graphene for cooling and purification of automobile exhausts. The heat exchanger directly affects the performance of the engine because proper heat dissipation and transfer can improve engine performance, reduce fuel consumption, and decrease the emission. Moreover, this effect is much more noticeable on coated heat pipes because of the enhanced thermal conductivity and mechanical properties of the graphene films. A heat null emitted by internal combustion engines was used in the experimental setup to test the thermal performance, cooling efficiency, and purification efficiency of the newly designed in-house exhaust simulation system where the new heat pipes were inserted. The results of the experiment show that the heat pipes have very high thermal performance as the efficiency of the heat pipes was calculated to be around 85%. Furthermore, the temperature decrease over the surfaces of the heat
Karthigairajan, M., Seeniappan, Kaliappan, Balaji, N., Natrayan, L., Sheik, Salman Basha, Ravi, D.
Technical Paper
Analyses of Cold Thermal Energy Storage Systems Using Eutectic Mixtures of Inorganic Hydrated Salts as Phase Change Materials2025-01-500301/23/2025
Cold thermal energy storage using phase changing materials is being researched to find freezing and thawing points. The use of inorganic hydrated salts, a type of phase changing material (PCM) used in cold energy storage systems without the use of existing renewable energy systems, allows for a longer cooling effect and saves energy. A high volumetric storage density and relatively high thermal conductivity make hydrated salts suitable materials for thermal energy storage. They can be used only as inorganic mixtures or else they can also be used as eutectic mixtures, which involve mixtures of inorganic–inorganic salts or simply a combination of two or more inorganic salts. This research deals with eutectic mixtures, which are 4% KNO3 + 96% H2O, 4% NaHCO3 + 96% H2O, and 2% KNO3 + 2% NaHCO3 + 96% H2O. Three different novel eutectic mixtures were examined and found a suitable mixture for a cold thermal energy system. An efficient phase change approach involving 2% KNO3 + 2% NaHCO3 + 96
Vasanthkumar, P., Santhoshkumar, A., Gopika, P., Murali, M., Meera, C.
Technical Paper
Heatable Vehicle Glazing with Antennas 2022-01-014803/29/2022
In this paper, we propose a vehicle antenna system on a conductive heat reflecting window. A slot antenna in a heatable vehicle glazing established between the heating bus bar, bus bar extension and the peripheral edge of an electrically conductive IR reflective coating. The antenna slot may be fed directly by a voltage source, a current source, or a coupled coplanar line at a position to excite both fundamental and higher order modes for multiband antenna applications. The slot antenna can be also established between split heating bus bars or heating bus bar extension to reduces heat loss and improve antenna efficiency. Multiple antennas can be integrated into the heatable glazing for multiband applications and/or diversity antenna systems. Results from simulation on the vehicle are compared with measurements.
Dai, David
Technical Paper
Use of Thermally Conductive Electrically Insulative (TCEI) Materials in E-motor Slot Liner Applications2022-01-022403/29/2022
Slot liners are commonly used in electric motors to electrically insulate the motor windings from the laminated core. However, thermal conductivity of materials commonly used as slot liners is very low compared to other components in the motor thus creating a barrier for heat transfer. This thermal barrier affects overall motor performance and efficiency. Also, slot liners typically lack intimate contact with the laminated core resulting in air gaps which further increase thermal resistance in the system. Slot liners are traditionally made from high temperature films/papers that are cut and slid into slots of motors. The proposed work looks at developing an injection moldable slot liner to minimize air gaps. Additionally, use of TECI materials further lowers thermal resistance. A thermal finite element model has been developed to evaluate effects of slot liner thermal properties and air gaps on temperature distribution within the motor. The model incorporates varying material
Sundararaman, Saikrishna, Szparagowski, Ray
Technical Paper
Delamination Failure on High-Output Diesel Engine Thermal Barrier Coatings 2022-01-053903/29/2022
An analytical mechanics model was employed to predict the delamination of several thermal-barrier-coated pistons that had been previously tested in a high-output, single-cylinder diesel engine. Some of the coatings delaminated during engine operation. Results are presented for two thicknesses of the same coating material, and for two similar coatings with different levels of stiffness. All the coating thermomechanical properties such as thermal conductivity, density, volumetric heat capacity, thickness, elastic modulus, coefficient of thermal expansion, Poisson ratio and toughness, were measured prior to engine testing. Previous measurements of the piston transient heat flux, based on fast-response surface temperature data, in the same engine were used as an input to calculate the multilayer wall temperature distribution. A theoretical methodology was employed to evaluate and predict the coating durability. The method considers the release rate of elastic strain energy stored in the
Koutsakis, Georgios, Saputo, John, Gingrich, Eric, Tess, Michael, Sampath, Sanjay, Ghandhi, J.
Technical Paper
A Molecular Dynamics Study of Tribological Properties of Silicon Carbide as a Metal-Free Friction Material2021-01-128410/11/2021
Friction materials containing metal ingredients used in automotive industry can cause unfavorable environmental impacts. Existing laws and regulations require phase out of heavy metals in brake pads. Substitutions for metals in friction materials, however, may introduce operational safety issues. In the current study, a molecular dynamics model based on LAMMPS has been developed to study the effect of material composition, density and geometric configurations on the tribological, mechanical and thermal properties of silicon carbide under various contact conditions at the atomic level. Successful simulations are performed to predict the elastic modulus, thermal conductivity, wear rate and coefficient of friction, with the incorporation of interfacial contact between surface asperities. The predicted properties can help enhance the performance of engineered metal free friction materials against thermal-mechanical failures. The following factors have been taken into consideration in the
Zhang, Yizhan, LeNeave, Cortney, Yi, Yun-Bo
Technical Paper
Effect of Single Layer Thin Film Thermal Barrier Coatings on Mechanical, Thermal and Tribological Characterization of Cast Iron (GJL 300)2021-28-028510/01/2021
Thermal Barrier Coatings (TBCs) are one of the most promising technologies for reducing heat dissipation through the combustion chamber in internal combustion engines. In this paper, Gadolinium Zirconate (GZ) was chosen as coating material and prepared using a solid-state synthesis process. Cast iron (GJL 300) was selected as substrate, which is predominantly used as the cylinder head material, and GZ was deposited using Electron Beam Physical Vapor Deposition Technique (EB-PVD). The mechanical, thermal, and tribological properties were evaluated as per the ASTM standards. Improved hardness and wear resistance is noted on coated substrates. The thermal conductivity and Coefficient of Thermal Expansion (CTE) of the coated substrates were decreased by 2.43% and 6.15% respectively when compared to uncoated substrates. Hence, it is confirmed that thin-film TBCs will also be helpful in retaining some heat inside the combustion chamber of IC engines.
Velusamy, Raja, Swaminathan, Mangudi Rangaswamy, Periyana Pillai, Hariharan, Annamalai, Suresh Babu, Ganapathy, Sakthinathan, Sathishkumar, Dhanalakshmi, Annamalai, Kumarasamy, Venkat, Natarajan, Radhakrishnan PhD, Vignesh, Kumaran, Naveen Kumar, Sharma, Gnanaeshwar
Technical Paper
Comparing and analysing the static and thermal characteristics of brake disc for three different materials2021-28-025310/01/2021
In automobiles, the most commonly used braking system is disc brake. In the brake disc, rotor is the rotating part of a wheel's disc brake assembly, against which the brake pads are applied by the driver through mechanical action. So, the disk is the important component in either slowing down or stopping the vehicle. These discs were commonly made of cast iron conventionally. But the limitations with respect to cast iron are that they have less corrosion resistance and heavy in weight. In order to overcome the above-said complications, alternate materials for disc have to be found. The main objective of this paper is to analyze the characteristics of three different materials and compare their results and suggest a suitable material that highly influences the conventional material and has better performance under on-road rigorous braking conditions. In order to find an alternative material for Cast Iron (CI), EN31, Ti-6Al-4V(Ti alloy) acts as a potential candidate in offering great
K, Kaviyarasan, R, Soundararajan, Richter R, Abhisheak, K, Siva, Purusothaman, S, S, Shiva Gurunathan
Technical Paper
Machinability Studies on Wire Electrical Discharge Machining (WEDM) of AA2014 alloy using Taguchi Grey Approach2021-28-026410/01/2021
AA 2014 is a copper based aluminium alloy which is having exceptional mechanical characteristics such as better strength, ductility and lesser fatigue. AA 2014 is most generally employed in various engineering applications such as fabrication of structural components, defense applications and manufacturing of aerospace components. Also, this material possess better resistant to corrosion which makes this material best suitable for numerous engineering applications. Unconventional methods of machining have been evolved for producing intricate shapes in electrically conductive components. Wire Electrical Discharge Machining (WEDM) is one among the unconventional machining method which is used for making intricate shape on any electrically conductive work material. In this work, an experimentation has been carried out on WEDM of AA 2014 alloy, employing Taguchi’s technique. The experimental runs have been conducted by taking into account, the process variables such as pulse-on-time, pulse
Navya, C., Chandra Sekhara Reddy PhD, M
Technical Paper
Tribological Behavior of Thermal and Mechanical Composite Reinforced Sisal Characteristics and Influence SiC Filling Material2021-28-027710/01/2021
In order to investigate the possible use of normal capital, we have tried by hand to manufacture sisal fibre polymer composites. Natural fibre composites are reusable, low-cost and biodegradable. Simple source, lesser compactness, superior basic property, lower quality, acceptable physical and mechanical properties, non acidic in environment, make them a good-looking biological substitute for glass, carbon or other artificial fibres. The outcome of SiC on the physical and mechanical properties of organic sisal composite materials is studied in this work. The composite was manufactured with and without SiC, mixing natural sisal fibre with polyester as a reinforcement medium. The investigational results showed that the tensile force of the mixture with 12 % SiC was 2.52 times better than that of the composite devoid of SiC. The collision strength of the 12% SiC merged is 1.72 times higher than that of the SiC pure polyester composite. The physical properties deliberate include thermal
RAJU, GANESAMOORTHY, NATARAJAN, Balaji, Chakaravarthy, Ezilarasan, Samikannu, Poovaragan, R, Soundararajan
Technical Paper
Inspection and Test Quality Systems, Requirements for Aviation, Space, and Defense OrganizationsAS9003B09/30/2021
Price increases in effect for this document as of January 2017 reflect a new copyright agreement for use of ISO 9001:2009. This standard includes selected quality system requirements from ISO 9001:2008[1] and AS9100:2009 applicable to noncomplex products and associated manufacturing processes. ISO 9001 text incorporated into this standard appears in standard font; while aviation, space, and defense industry additional requirements, definitions, and notes are presented in bold, italic text. The requirements of this standard are intended to be applied in whole, without any exclusions. Compliance with all corresponding AS9100 requirements is considered to meet/exceed compliance with the requirements of this standard. The requirements specified in this standard are complementary (not alternative) to contractual and applicable statutory and regulatory requirements. Should there be a conflict between the requirements of this standard and applicable statutory or regulatory requirements, the
G-14 Americas Aerospace Quality Standards Committee (AAQSC)
Technical Paper
A Holistic Approach of Developing New High Strength Cast Iron for Weight Optimization2021-26-024409/22/2021
Cast Iron is being used in various Industries like Automotive, Agriculture, Construction etc., for many decades. Metal casting processes have its unique advantages like ease of heavy weight castings, intricate shapes, higher productivity. Commercially viable (low cost) etc., using wide range of materials like Gray cast iron, Spheroidal cast iron, Malleable cast iron ,cast steel etc., Cast iron have an excellent properties like high dampening capacity, higher thermal conductivity, wear resistance required by many critical applications. These unique combinations will be chosen to serve the purposes both functionally and commercially. However, in last one-decade automotive and agriculture industries are facing issue of fuel economy which directly influenced by the weight of the vehicle. For off-road vehicle like tractors, One of the major contributor in vehicle weight is cast iron. Many material grades and strengthening mechanisms are recently being evolved to optimize the cast iron
Gunalan, Magendran, Anandeswaran, V.A
Technical Paper
Aluminum Alloy, Plate, 7.9Zn - 1.8Cu - 2.0Mg - 0.10Zr (7099-T7651) Solution Heat Treated, Stress Relieved, and OveragedAMS4364A-TEST-REC (Historical)09/15/2021
This specification covers an aluminum alloy in the form of plate from 1.000 to 6.000 inches (25.40 to 152.40 mm) in thickness (see 8.6).
AMS D Nonferrous Alloys Committee
Material Specification
Aluminum Alloy, Plate, 7.9Zn - 1.8Cu - 2.0Mg - 0.10Zr (7099-T7651) Solution Heat Treated, Stress Relieved, and OveragedAMS4364A (Current)09/15/2021
This specification covers an aluminum alloy in the form of plate from 1.000 to 6.000 inches (25.40 to 152.40 mm) in thickness (see 8.6).
AMS D Nonferrous Alloys Committee
Material Specification
5 Ws of Puncture-Proof Soft ElectronicsTBMG-3978809/01/2021
The durable soft electronics could be used in wearable electronics and soft robotics and could someday be part of a stretchable smartphone.
Magazine Article
Reduced Heat Leakage Improves Wearable Health DeviceTBMG-3961708/01/2021
Researchers have enhanced a flexible body heat harvester by preventing heat leakage. The harvesters use heat energy from the human body to power wearable technologies. The technology relies on the same principles governing rigid thermoelectric harvesters that convert heat to electrical energy.
Magazine Article
CONNECTOR ACCESSORIES, ELECTRICAL BACKSHELL, 90 DEGREE, SELF LOCKING AND NON-SELF LOCKING, PRE-ATTACHED SHIELD TERMINATION (RFI/EMI), BOOT ACCOMODATION, CATEGORY 3B FOR MIL-DTL-38999 SERIES III AND IV CONNECTORSAS85049/117D (Current)07/30/2021
AE-8C1 Connectors Committee
Technical Standard
CONNECTOR ACCESSORIES, ELECTRICAL BACKSHELL, STRAIGHT, NON-SELF LOCKING AND SELF LOCKING, PRE-ATTACHED SHIELD TERMINATION (RFI/EMI), BOOT ACCOMMODATION, CATEGORY 3B (FOR MIL-DTL-83723 SERIES III, AS50151 CRIMP, AS95234, AS81703 SERIES III, AND MIL-DTL-26482 SERIES II CONNECTORS)AS85049/109D (Current)07/30/2021
AE-8C1 Connectors Committee
Technical Standard
CONNECTOR ACCESSORIES, ELECTRICAL BACKSHELL, 90 DEGREE, SELF-LOCKING AND NON-SELF LOCKING, PRE-ATTACHED SHIELD TERMINATION (RFI/EMI), BOOT ACCOMMODATION, CATEGORY 3B (FOR MIL-DTL-38999 SERIES I AND II CONNECTORS)AS85049/114D (Current)07/30/2021
AE-8C1 Connectors Committee
Technical Standard
CONNECTOR ACCESSORIES, ELECTRICAL BACKSHELL, STRAIGHT, SELF LOCKING AND NON-SELF LOCKING, PRE-ATTACHED SHIELD TERMINATION (RFI/EMI), BOOT ACCOMMODATION, CATEGORY 3B (FOR MIL-DTL-38999 SERIES III AND IV CONNECTORS)AS85049/115D (Current)06/22/2021
AE-8C1 Connectors Committee
Technical Standard
CONNECTOR ACCESSORIES, ELECTRICAL BACKSHELL, STRAIGHT, SELF LOCKING AND NON-SELF LOCKING, PRE-ATTACHED SHIELD TERMINATION (RFI/EMI), BOOT ACCOMMODATION, CATEGORY 3B (FOR MIL-DTL-38999 SERIES I AND II CONNECTORS)AS85049/112D (Current)06/22/2021
AE-8C1 Connectors Committee
Technical Standard
CONNECTOR ACCESSORIES, ELECTRICAL BACKSHELL, 90 DEGREE, SELF LOCKING AND NON-SELF LOCKING, PRE-ATTACHED SHIELD TERMINATION (RFI/EMI), BOOT ACCOMMODATION, CATEGORY 3B (FOR MIL-DTL-83723 SERIES III, AS50151 CRIMP, AS95234, AS81703 SERIES III, AND MIL-DTL-26482 SERIES II CONNECTORS)AS85049/111D (Current)06/22/2021
AE-8C1 Connectors Committee
Technical Standard
Hose Characteristics and Selection ChartAIR797F (Current)04/30/2021
This document lists military and industry specifications and standards which are used in aerospace systems and for ground servicing equipment. The characteristic limitations of the hose, which are of major importance to designers, and the sizes in which the hoses are standard are shown. Revisions and amendments, which are current for these specifications and standards, are not listed.
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Information Report
Hose Characteristics and Selection ChartAIR797F-TEST-REC (Historical)04/30/2021
This document lists military and industry specifications and standards which are used in aerospace systems and for ground servicing equipment. The characteristic limitations of the hose, which are of major importance to designers, and the sizes in which the hoses are standard are shown. Revisions and amendments, which are current for these specifications and standards, are not listed.
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Information Report
Aluminum Alloy, Plate 6.2Zn - 2.3Cu - 2.2Mg - 0.12Zr (7050-T7451) Solution Heat Treated, Stress Relieved, and OveragedAMS4050K-TEST-REC (Historical)04/22/2021
This specification covers an aluminum alloy in the form of plate.
AMS D Nonferrous Alloys Committee
Material Specification
Copper-Beryllium Alloy, Bars and Rods 98Cu - 1.9Be Solution Heat Treated, Cold Worked, and Precipitation Heat Treated (TH04, formerly HT)AMS4534E-TEST-REC (Historical)04/22/2021
This specification covers a copper-beryllium alloy in the form of bars and rods up to 3.000 inches (76.20 mm), inclusive, in nominal diameter or least distance between parallel sides (see 8.7).
AMS D Nonferrous Alloys Committee
Material Specification
Copper-Beryllium Alloy, Bars and Rods 98Cu - 1.9Be Solution Heat Treated, Cold Worked, and Precipitation Heat Treated (TH04, formerly HT)AMS4534E (Current)04/22/2021
This specification covers a copper-beryllium alloy in the form of bars and rods up to 3.000 inches (76.20 mm), inclusive, in nominal diameter or least distance between parallel sides (see 8.7).
AMS D Nonferrous Alloys Committee
Material Specification
Aluminum Alloy, Plate 6.2Zn - 2.3Cu - 2.2Mg - 0.12Zr (7050-T7451) Solution Heat Treated, Stress Relieved, and OveragedAMS4050K (Current)04/22/2021
This specification covers an aluminum alloy in the form of plate.
AMS D Nonferrous Alloys Committee
Material Specification
TERMINALS, LUG AND SPLICES, CONDUCTOR, CRIMP STYLE, SPLICE, ELECTRIC (PERMANENT, TYPE II, CLASS 1) FOR 105 °C TOTAL CONDUCTOR TEMPERATUREAS7928/5C (Historical)03/01/2021
AE-8C2 Terminating Devices and Tooling Committee
Technical Standard
Ultra-Thin, Battery-Free Strain Sensors for Industrial Robotic ArmsTBMG-3849202/01/2021
Fabricated using flexible, stretchable, and electrically conductive nanomaterials called MXenes, novel strain sensors were developed that are ultra-thin, battery-free, and can transmit data wirelessly. By controlling the surface textures of MXenes, researchers were able to control the sensing performance of strain sensors for various soft exoskeletons. The sensor design principles developed will significantly enhance the performance of electronic skins and soft robots.
Magazine Article
Microstrip Circuit and Material Characterization SystemTBMG-3836101/01/2021
Characterizing microstrip superconducting film at millimeter-wave frequencies is difficult without undergoing a complex thin film fabrication process. This characterization includes measuring the ohmic loss at a resolution of 10100 parts per million (ppm).
Magazine Article
Supercool Mini-ThermometerTBMG-3833501/01/2021
Researchers have developed a miniature superconducting thermometer that measures temperatures below 1 kelvin (-272.15 °C or -457.87 °F), down to 50 millikelvin (mK) and potentially 5 mK. It is smaller, faster, and more convenient than conventional cryogenic thermometers for chip-scale devices and could be mass-produced.
Magazine Article
New Method Makes Computer Memory from Titanium OxideTBMG-3834001/01/2021
A team has developed a method to imbue computer chips that power machine-learning applications with more processing power by using a common material found in house paint in an analog memory device that enables highly energy-efficient machine inference operations. The material, titanium oxide, is a commonly made material used in house paint. It is an oxide, which means it already contains oxygen. Subtracting some of the oxygen creates oxygen vacancies that make the material electrically conductive. Those oxygen vacancies can now store electrical data, giving almost any device more computing power.
Magazine Article
ASSEMBLED COUPLING ENVELOPE, THREADLESS - FLEXIBLE, FIXED CAVITY, CURRENT CARRYING, SELF BONDING, ENVELOPE DIMENSIONSAS7511B (Current)12/22/2020
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Technical Standard
Aluminum Alloy, Extruded Rod, Bar, and Profiles (7055-T76511) 8.0Zn - 2.3Cu - 2.0Mg - 0.16Zr Solution Heat Treated, Stress-Relieved, and OveragedAMS4336C (Current)12/10/2020
This specification covers an aluminum alloy procured in the form of extruded bars, rods, and profiles (shapes) with nominal thickness up to 3.000 inch (76.20 mm), inclusive, and having a cross-sectional area of 26.3 square inches (170 cm2) maximum and circle size of 15.3 inches (389 mm) maximum (see 8.7).
AMS D Nonferrous Alloys Committee
Material Specification
High-Performance, Lightweight, Easy-to-Fabricate Heat ExchangerTBMG-3819412/01/2020
Thermoelectric generator systems require high-performance hot-side and cold-side heat exchangers to provide the temperature differential needed to transfer thermal energy while withstanding temperatures up to 650 °C. Because the hot-side heat exchangers must have a high heat flux, they are often made of metals such as stainless steel or Inconel alloys.
Magazine Article
Ambient Light Alters Refraction in 2D MaterialTBMG-3801411/01/2020
Microscopic crystals in tantalum disulfide have a starring role in what could become a hit for 3D displays, virtual reality and even self-driving vehicles. A two-dimensional array of the material has unique optical characteristics that can be controlled in ambient conditions and under general illumination.
Magazine Article
Driver Drowsiness and Fatigue in the Safe Operation of Vehicles - Definition of Terms and ConceptsJ3198_202010 (Current)10/26/2020
This SAE Information Report provides definitions and discussions of key terms concerning driver drowsiness and fatigue, and basic information on measuring drowsiness and fatigue. It also includes information and concepts for driver drowsiness as they relate to the safe operation of a vehicle. The key driver drowsiness and fatigue causal factors include the following: (1) sleep quality and quantity, (2) time of day, (3) time awake, (4) time on task (modulated by characteristics of the driving task), (5) task-related fatigue (variations of arousal levels related to task underload and overload), and (6) combinations of these factors. Medical conditions, medication, alcohol, or drugs exacerbate drowsiness; however, the discussion in this report is limited to fatigue concepts. This report has two primary outputs: (1) definitions and discussions of key terms concerning driver drowsiness and fatigue, and (2) basic information on measuring drowsiness and fatigue and its effects on the safe
Driver Metrics, Performance, Behaviors and States Committee
Information Report
Wearable Sensors Printed on Natural Materials Analyze Substances Present in SweatTBMG-3783910/01/2020
A wearable sensor printed on microbial nanocellulose, a natural polymer, has been created in Brazil by researchers at the University of São Paulo (USP) in São Carlos in collaboration with colleagues at São Paulo State University (UNESP) in Araraquara, the University of Araraquara (UNIARA), the University of Campinas (UNICAMP), and the Brazilian National Nanotechnology Laboratory (LNNano).
Magazine Article
3D-Printed Soft, Rubbery Brain ImplantsTBMG-3780210/01/2020
Brain implants are typically made from metal and other rigid materials that over time can cause inflammation and the buildup of scar tissue. Engineers are developing soft, flexible neural implants that can gently conform to the brain's contours and monitor activity over longer periods without aggravating surrounding tissue. Such flexible electronics could be softer alternatives to existing metal-based electrodes designed to monitor brain activity and may also be useful in brain implants that stimulate neural regions to ease symptoms of epilepsy, Parkinson's disease, and severe depression.
Magazine Article
Possible Significant Response Speedup from Detuning a Resonator BolometerTBMG-3778810/01/2020
Kinetic inductance bolometers and calorimeters, each consisting of a kinetic inductance device (KID) suspended on a membrane and embedded in a resonant circuit, are being developed for applications such as planetary science, climate science, and X-ray spectroscopy. Arrays of these resonator-bolometers, each with a unique resonant frequency, are coupled to a single feedline, allowing many bolometers or calorimeters to be multiplexed using microwave readout. These devices potentially offer a combination of high sensitivity, large arrays, and broadband response not available from competing technologies.
Magazine Article
Aftermarket Composite Wheels Made of Matrix Material and Fiber Reinforcement Intended for Normal Highway Use - Test Procedures and Performance RequirementsJ3204_202009 (Current)09/09/2020
This SAE Recommended Practice provides minimum performance requirements and uniform procedures for fatigue and impact testing, electrical resistance, and maximum operating temperature (MOT) of wheels intended for normal highway use on passenger cars, light trucks, and multipurpose vehicles.
Wheel Standards Committee
Recommended Practice
Aftermarket Composite Wheels Made of Matrix Material and Fiber Reinforcement Intended for Normal Highway Use - Test Procedures and Performance RequirementsJ3204_202009-TEST-REC (Historical)09/09/2020
This SAE Recommended Practice provides minimum performance requirements and uniform procedures for fatigue and impact testing, electrical resistance, and maximum operating temperature (MOT) of wheels intended for normal highway use on passenger cars, light trucks, and multipurpose vehicles.
Wheel Standards Committee
Recommended Practice
Thermally Conductive, Stretchable Rubber MaterialTBMG-3764909/01/2020
A thermally conductive rubber material was developed that represents a breakthrough for creating soft, stretchable machines and electronics. The new material, nicknamed “thubber,” is an electrically insulating composite that exhibits a combination of metal-like thermal conductivity and elasticity similar to soft, biological tissue that can stretch more than six times its initial length.
Magazine Article
3D-Printed Glucose BiosensorsTBMG-3745408/01/2020
People with diabetes most commonly monitor their disease with glucose meters that require constant fingerpricking. Continuous glucose monitoring systems are an alternative but they are not cost-effective. Researchers have been working to develop wearable, flexible electronics that can conform to patients’ skin and monitor the glucose in body fluids such as sweat. To build such sensors, manufacturers have used traditional manufacturing strategies such as photolithography or screen printing. While these methods work, they have several drawbacks including requiring the use of harmful chemicals and expensive cleanroom processing. They also create a lot of waste.
Magazine Article
Process for Producing High-Quality, Lightweight MirrorsTBMG-3701806/01/2020
Virtually all conventional lightweight mirrors are made by optically grinding and polishing an already lightweighted blank. Mirrors made this way always risk print-through to the optical surface. In some cases, this can be removed by a zero-pressure process, such as ion-beam polishing, although these processes tend to be slow and costly. Lightweighting after optical polishing is not an option for conventional materials as their inhomogeneous qualities and internal stresses cause the lightweighting to distort the optical surface.
Magazine Article
Wearable Device Monitors HealthTBMG-3703606/01/2020
Engineers have demonstrated a flexible device that harvests the heat energy from the human body to monitor health. The device surpasses other flexible harvesters that use body heat as the sole energy source.
Magazine Article
Soft Tactile Logic Distributes Decision-Making Throughout Stretchable MaterialTBMG-3704706/01/2020
Soft tactile logic was developed that can make decisions at the material level where the sensor is receiving input, rather than relying on a centralized, semiconductor-based logic system. The resulting device is not quite a robot and not quite a computer but has characteristics of both.
Magazine Article
Nano-Infused Ceramic Can Report its own HealthTBMG-3683005/01/2020
A ceramic was developed that becomes more electrically conductive under elastic strain and less conductive under plastic strain. The material could lead to a new generation of sensors embedded into structures like buildings, bridges, and aircraft able to monitor their own health.
Magazine Article
Method Enables Conductive Gels to Stick When WetTBMG-3685505/01/2020
Polymers that are good conductors of electricity could be useful in biomedical devices to help with sensing or electrostimulation, for example. But there has been a sticking point preventing their widespread use: their inability to adhere to a surface such as a sensor or microchip and stay put despite moisture from the body.
Magazine Article
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