Browse Topic: Coatings, colorants, and finishes
ABSTRACT Military vehicle survivability can be enhanced by implementing Lightweight Fuel Tanks with an Engineered Self-Sealing and Energy Absorbing solution. A thin walled plastic or aluminum fuel tank with an outer self-sealing protection coating and a properly installed ballistic baffle provide increased sealing performance as compared to amour protected fuel tank. Design features include reduced weight penalty, survivability, self-sealing against kinetic energy threats, maximum fuel in space claim, flexible design, and low tooling charges. Citation: Stuck, LW, “Self Sealing Fuel Tanks in Vehicles Without Armor”, In Proceedings of the Ground Vehicle Systems Engineering and Technology Symposium (GVSETS), NDIA, Novi, MI, Aug. 10-12, 2021
ABSTRACT Active thermography has been demonstrated to be an effective tool for detection of near-surface corrosion hidden under paint, as well as hidden material loss due to corrosion. Compared to established point inspection techniques (e.g. ultrasound, eddy current), thermography offers fast, wide-area inspection of flat or curved surfaces that does not require direct contact or coupling. In its simplest form, it can be used to perform qualitative inspection using a heat gun or lamp and an uncooled IR camera. Recent developments in thermographic signal processing, coupled with improved IR camera and thermal excitation technology have resulted in significant advances in resolution, sensitivity and probability of detection of near and far-surface corrosion, and the ability to perform quantitative characterization of corrosion
ABSTRACT Autonomous driving is emerging as the future of transportation recently. For autonomous driving to be safe and reliable the perception sensors need sufficient vision in sometimes challenging operating conditions including dust, dirt, and moisture or during inclement weather. LiDAR perception sensors used in certain autonomous driving solutions require both a clean and dry sensor screen to effectively operate in a safe manner. In this paper, UV durable Hydrophobic (UVH) coatings were developed to improve LiDAR sensing performance. A lab testbed was successfully constructed to evaluate UVH coatings and uncoated control samples for LiDAR sensor under the simulated weathering conditions, including fog, rain, mud, and bug. In addition, a mobile testbed was developed in partnership with North Dakota State University (NDSU) to evaluate the UVH coatings in an autonomous moving vehicle under different weathering conditions. These UV-durable easy-to-clean coatings with high optical
Butterflies can see more of the world than humans, including more colors and the field oscillation direction, or polarization, of light. This special ability enables them to navigate with precision, forage for food, and communicate with one another. Other species, like the mantis shrimp, can sense an even wider spectrum of light, as well as the circular polarization, or spinning states, of light waves. They use this capability to signal a “love code,” which helps them find and be discovered by mates
From televisions to smartphones, organic light-emitting diodes (OLEDs) are finding their way into many everyday devices. For use in displays, blue OLEDs are also required to supplement the primary colors — red and green. Especially in blue OLEDs, impurities give rise to strong electrical losses, which could be partly circumvented by using highly complex and expensive device layouts
This specification covers the requirements for black oxide coatings on parts
Many performance sport passenger vehicles use drilled or grooved cast iron brake rotors for a better braking performance or a cosmetic reason. Such brake rotors would unfortunately cause more brake dust emission, appearing with dirty wheel rims. To better understand the effects of such brake rotors on particle emission, a pin-on-disc tribometer with two particle emission measurement devices was used to monitor and collect the emitted airborne particles. The first device was an aerodynamic particle sizer, which is capable of measuring particles ranging from 0.5 to 20 μm. The second device was a condensation particle counter, which measures and collects particles from 4 nm to 3 μm. The testing samples were scaled-down brake discs (100 mm in diameter) against low-metallic brake pads. Two machined surface conditions (plain and grooved) with uncoated or ceramic-coated friction surfaces were selected for the investigation. The results showed that the grooved friction surface led to a higher
A soft, flexible film senses the presence of nearby objects without physically touching them. The study features the new sensor technology to detect eyelash proximity in blink-tracking glasses
This SAE Aerospace Recommended Practice (ARP) covers the requirements for the types of glass to be utilized in the fabrication of cover glasses and lighting wedges used in aerospace instruments. It defines the maximum extent of physical defects and recommends standard methods of inspection and evaluation. Definitions of terminology used in this document are covered in 2.2
As aerospace engineers push the boundaries of new frontiers, the need for advanced materials that can withstand the rigorous demands of these advanced applications is relentless. These materials go beyond functionality; it is about ensuring reliability in the skies, where failure is not an option. Fluorosilicone can help do exactly that. In the 1960s, the U.S. Air Force noticed that conventional silicone-based sealants, coatings, and other components degraded rapidly when exposed to fuels, de-icing fluids, and other hydrocarbon-based solvents. Dimethyl-based silicones are non-polar and easily absorb hydrocarbon-based solvents, which may result in material swelling, mechanical weakening, and ultimately, failure
This specification covers the requirements for producing a zinc phosphate coating on ferrous alloys and the properties of the coating
This document establishes the requirements for the sequencing of processes relating to parts fabricated from 300M or 4340 modified steel heat treated to, or to be heat treated to, 270,000 psi (1860 MPa) minimum ultimate tensile strength (UTS) and higher
This SAE practice is intended for the sample preparation of test pieces for automotive wheels and wheel trim. The practice provides a consistent scribing method for use on test panels and or component parts with substrate chemical pretreatment and coating systems. Test specimens can then be subjected to various corrosion tests in order to evaluate performance without significant variations of the degree of exposure of the substrate. The scribing is used to create a break in the coating/finishing as can occur in the field through gravel and other damaging conditions. NOTE— Significant variability is attributed to surface contour, coating hardness/softness, operator reproducibility, and the scribing tool and it’s condition
Researchers have created a flexible paper-based sensor that operates like the human brain. They fabricated a photo-electronic artificial synapse device composed of gold electrodes on top of a 10 μm transparent film consisting of zinc oxide (ZnO) nanoparticles and cellulose nanofibers (CNFs
This specification establishes the requirements for a hard anodic coating on aluminum and aluminum alloys
This SAE Aerospace Standard (AS) defines the nomenclature for surface finishes commonly used for sheet and strip in aerospace material specifications. It is applicable to steel and to iron, nickel, cobalt, and titanium base alloys
A durable, copper-based coating developed by a team at Dartmouth University can be integrated into fabric to create responsive, reusable materials such as protective equipment, environmental sensors, and smart filters
This specification establishes requirements for a tape that is used to perform organic coatings adhesion testing
Using dc magnetron sputtering, Al/Si films were made on surfaces made of fused quartz and silicon. It was carefully controlled that the films contained no more than 7 at.% silicon under ideal deposition conditions. This was done by changing the target's structure and adding silicon lines to it. This had to be done to get a good reading on how much silicon was in the plates. After being heated to 800°C and then cooled in very cold water, the thermo-elastic face-centered cubic structure changed into the flat crush test martensite. In Al/Si films with a Si content of 25.6%, this change took place. It looks like the shift in the opposite way was also thermoelastic. The several thermoelastic transitions that happened were caused by changes in temperature. Some Al-36 at.% Si coatings that were scraped off of a quartz substrate showed shape memory qualities when heated after being deformed. The coverings on these things were warped. Before the fabrication process began, a diaphragm-shaped
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