|
Aluminium Foam Sandwich
Aluminium foam sandwich (AFS) is a sandwich panel product which is made of two metallic dense face sheets and a metal foam core made of an aluminium alloy. AFS is an engineering structural material owing to its stiffness-to-mass ratio and energy absorption capacity ideal for application such as the shell of a high-speed train. Production and materials In terms of the bonding between face sheets and foam core the processing of AFS is categorised into two ways – ex-situ and in-situ bonding.J Banhart, H-W Seeliger, Aluminium foam sandwich panels: manufacture, metallurgy and applications, Advanced Engineering Materials, 2008, 10:793-802. Ex-situ bonded AFS Ex-situ bonding is achieved by gluing face sheets with an aluminium foam by adhesive bonding, brazing or diffusion bonding. Foams used in this method are either closed-cell or open-cell. When a closed-cell foam is used then it is produced from aluminium alloys either by liquid metal route (e.g. Alporas, Cymat) or by powder m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandwich Panel
A sandwich panel is any structure made of three layers: a low-density core ( PIR, mineral wool, XPS), and a thin skin-layer bonded to each side. Sandwich panels are used in applications where a combination of high structural rigidity and low weight is required. The structural functionality of a sandwich panel is similar to the classic I-beam, where two face sheets primarily resist the in-plane and lateral bending loads (similar to flanges of an I- beam), while the core material mainly resists the shear loads (similar to the web of an I-beam). The idea is to use a light/soft but thick layer for the core and strong but thin layers for face sheets. This results in increasing the overall thickness of the panel, which often improves the structural attributes, like bending stiffness, and maintains or even reduces the weight. Sandwich panels are an example of a sandwich-structured composite: the strength and lightness of this technology makes it popular and widespread. Its versatil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metal Foam
Regular foamed aluminium In materials science, a metal foam is a material or structure consisting of a solid metal (frequently aluminium) with gas-filled pores comprising a large portion of the volume. The pores can be sealed (closed-cell foam) or interconnected (open-cell foam). The defining characteristic of metal foams is a high porosity: typically only 5–25% of the volume is the base metal. The strength of the material is due to the square–cube law. Metal foams typically retain some physical properties of their base material. Foam made from non-flammable metal remains non-flammable and can generally be recycled as the base material. Its coefficient of thermal expansion is similar while thermal conductivity is likely reduced. Definitions Open-cell Open-celled metal foam, also called metal sponge, can be used in heat exchangers (compact electronics cooling, cryogen tanks, PCM heat exchangers), energy absorption, flow diffusion, scrubbers, flame arrestors, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-speed Rail
High-speed rail (HSR) is a type of rail transport network utilising trains that run significantly faster than those of traditional rail, using an integrated system of specialised rolling stock and dedicated railway track, tracks. While there is no single definition or standard that applies worldwide, lines built to handle speeds of at least or upgraded lines of at least are generally considered to be high-speed. The first high-speed rail system, the Tōkaidō Shinkansen, began operations in Honshu, Japan, in 1964. Due to the streamlined spitzer (bullet), spitzer-shaped nose cone of the 0 Series Shinkansen, trains, the system also became known by its English nickname bullet train. Japan's example was followed by several European countries, initially in High-speed rail in Italy, Italy with the Florence–Rome high-speed railway, Direttissima line, followed shortly thereafter by High-speed rail in France, France, High-speed rail in Germany, Germany, and High-speed rail in Spain, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TWiT
TWiT.tv is a podcast network that broadcasts technology-focused podcasts, founded by broadcaster and author Leo Laporte in 2005, and run by his wife and company CEO Lisa Laporte. The network began operation in April 2005 with the launch of '' This Week in Tech''. '' Security Now'' was the second podcast on the network, debuting in August of that year. As of January 2024, the network hosts 14 podcasts; however, due to declining advertisement sales, some are being discontinued, or are only available with a Club TWiT subscription and the TWiT studio was closed in August 2024. Podcasts include ''This Week in Tech,'' ''Security Now'', and '' MacBreak Weekly''. TWiT founder and owner Leo Laporte, in an October 2009 speech, stated that it grossed revenues of $1.5 million per year, while costs were around $350,000. In November 2014, during an interview with American Public Media's ''Marketplace'' Leo Laporte stated that TWiT makes $6 million in ad revenue a year from 5 million ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cymat Technologies
Cymat Technologies is a materials technology company based out of Mississauga, Ontario, Canada, and involved in the production of stabilized aluminum foam. Business Cymat Technologies has the worldwide rights, through patents and licenses, to manufacture Stabilized Aluminum Foam (SAF). Cymat is focused on producing SAF for architecture, blast mitigation and automotive industries. The company markets architectural SAF under the Alusion trademark and automotive and blast mitigation SAF under the SmartMetal trademark. Cymat Technologies operates out of its manufacturing plant in Toronto, Canada. The plant can manufacture approximately $50 million in stabilized aluminum foam annually. Process As described in the patent originally created by Alcan with parallel patents created by Norsk Hydro, "Stabilized Aluminum Foam" is generated in a continuous casting process via direct shop air injection into a Metal Matrix Composite (MMC) melt. The MMC comprises an Al-Si cast alloy with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Powder Metallurgy
Powder metallurgy (PM) is a term covering a wide range of ways in which materials or components are made from metal powders. PM processes are sometimes used to reduce or eliminate the need for subtractive manufacturing, subtractive processes in manufacturing, lowering material losses and reducing the cost of the final product. This occurs especially often with small metal parts, like gears for small machines. Some porous products, allowing liquid or gas to permeate them, are produced in this way. They are also used when melting a material is impractical, due to it having a high melting point, or an alloy of two mutually insoluble materials, such as a mixture of copper and graphite. In this way, powder metallurgy can be used to make unique materials impossible to get from melting or forming in other ways. A very important product of this type is tungsten carbide. Tungsten carbide is used to cut and form other metals and is made from tungsten carbide particles bonded with cobalt. Tu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Age Hardening
Precipitation hardening, also called age hardening or particle hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel, titanium, and some steels, stainless steels, and duplex stainless steel. In superalloys, it is known to cause yield strength anomaly providing excellent high-temperature strength. Precipitation hardening relies on changes in solid solubility with temperature to produce fine particles of an impurity phase, which impede the movement of dislocations, or defects in a crystal's lattice. Since dislocations are often the dominant carriers of plasticity, this serves to harden the material. The impurities play the same role as the particle substances in particle-reinforced composite materials. Just as the formation of ice in air can produce clouds, snow, or hail, depending upon the thermal history of a given portion of the atmosphere, precipitation in soli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser Welding
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word ''laser'' originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow and the optical amplifier patented by Gordon Gould. A laser differs from other sources of light in that it emits light that is ''coherent''. Spatial coherence allows a laser to be focused to a tight spot, enabling uses such as optical communication, laser cutting, and lithography. It also allows a laser beam to stay narrow over great distances ( collimation), used in laser pointers, lidar, and free-space optical communication. Lasers can also have high temporal coherence, which permits them to emit light with a very narrow frequency spectrum. Temporal coherence can al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TIG Welding
Gas tungsten arc welding (GTAW, also known as tungsten inert gas welding or TIG, tungsten argon gas welding or TAG, and heliarc welding when helium is used) is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area and electrode are protected from oxidation or other atmospheric contamination by an inert shielding gas (argon or helium). A filler metal is normally used, though some welds, known as ' autogenous welds', or ' fusion welds' do not require it. A constant-current welding power supply produces electrical energy, which is conducted across the arc through a column of highly ionized gas and metal vapors known as a plasma. The process grants the operator greater control over the weld than competing processes such as shielded metal arc welding and gas metal arc welding, allowing stronger, higher-quality welds. However, TIG welding is comparatively more complex and difficult to master, and furthermore, it is significantly slo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MIG Welding
Mig, MiG, or MIG may refer to: Business * MiG, a Russian aircraft corporation **Any of the MiG aircraft *Marfin Investment Group MIG Holdings S.A. (also known as MIG) is a Greece, Greek investment company. It has acquired several companies and has changed name several times since. In 2004 it took the name ''Marfin Financial Group'' following the triple merger of ''Comm G ..., Greek private equity company * Atlas Arteria, formerly Macquarie Infrastructure Group, toll roads company * Mortgage indemnity guarantee Other uses * Mig33 mobile social networking, Australian digital media company * Luton Town MIGs, English football hooligans * Monokine Induced by Gamma interferon, or CXCL9 * IATA code for Mianyang Nanjiao Airport, China * Mig Ayesa, an Australian singer-songwriter ** ''MiG'' (album), a 2007 album by Mig Ayesa * Metal inert gas welding or MIG welding {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riveting
A rivet is a permanent mechanical fastener. Before being installed, a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the ''tail''. On installation, the deformed end is called the ''shop head'' or buck-tail. Because there is effectively a head on each end of an installed rivet, it can support tension loads. However, it is much more capable of supporting shear loads (loads perpendicular to the axis of the shaft). Fastenings used in traditional wooden boat building, such as copper nails and clinch bolts, work on the same principle as the rivet but were in use long before the term ''rivet'' was introduced and, where they are remembered, are usually classified among nails and bolts respectively. History Solid rivets are one of the oldest and most reliable types of fasteners, having been found in archaeological findings dating back to the Bronze Age. Rivet holes have been found in Egyptian spearheads dating back to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
