Browse Topic: Metals

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This specification covers a corrosion- and heat-resistant nickel alloy in the form of bars, forgings, flash-welded rings, and stock for forging or flash-welded rings.
AMS F Corrosion and Heat Resistant Alloys Committee
Due to the increasing precision requirements for stainless steel castings in the current industrial field, we take stainless steel as the object, use numerical simulation to analyze the manufacturing process of castings, and explore the mechanism of related defects and preventive measures. The results indicate that in the process optimization of small castings, the maximum shrinkage and porosity of the conventional scheme, the optimization scheme with the addition of cold iron and insulation riser, and the optimization scheme with the improved pouring system combined with the optimal parameters are 1.83%, 1.64%, and 1.42%, respectively. The optimal pouring temperature, pouring speed, and shell preheating temperature of medium- and large-sized castings are: 1620°C, 1.5 kg/s, and 1100°C, respectively. According to the aforementioned findings, the study raises the standard of precision production for stainless steel, and fuel the growth of the precision casting sector.
Huang, JieZhang, Hongshan
This paper investigates the performance of a dissipative material compared to conventional acoustic materials under conditions that simulate real-world vehicle applications with acoustic leakage. Various acoustic materials were evaluated through laboratory experiments, which included acoustic leakage in both the steel panel and the acoustic materials. Acoustic leakages commonly occur in actual vehicle conditions at pass-throughs or fastener mounting locations. The study also presents in-vehicle test results to demonstrate the effectiveness of the dissipative material in managing acoustic leakage.
Yoo, TaewookMaeda, HirotsuguSawamoto, KeisukeAnderson, BrianGan, KimTongHerdtle, Thomas
Basic structures of vehicle frames、aircraft fuselages and ship hulls are made of beams、columns and trusses. If Acoustic Black Holes(ABH) are carefully arranged alongside with the wave propagation paths in those structures, the wave propagation paths could be changed at NVH engineers’ will and the structure vibrations can be reduced. Two kinds of ABHs are used in this paper: one is ABH made of Polyurethane(PU), other one is ABH composed of several steel plate 1D ABH stacked up in parallel. Three structures are used to test the effectiveness of ABHs for vibration reductions: a squared hollow sectional steel commonly used in motorcoach/bus chassis and frame structures, a simple frame for motorcoach airbag suspension and a 12m chassis structure. The attached ABHs show a great vibration attenuation in terms of transfer functions on the basic structure element for a motorcoach. The lateral, vertical and longitudinal transfer functions for steel ABHs were greatly reduced from 13.2~14.7 dB
Xu, ChuanyanWang, JianjunXing, QisenChen, HengbinHuang, Xianli
This specification covers an aluminum alloy in the form of alclad sheet and plate 0.008 to 1.000 inches (0.203 to 25.4 mm) supplied in the -T3/-T351 temper (see 8.5).
AMS D Nonferrous Alloys Committee
This specification covers two methods for determining the percentage of delta ferrite in steels and other iron alloys. When applicable, this specification will be invoked by the material specification.
AMS F Corrosion and Heat Resistant Alloys Committee
This specification covers an arc-cast molybdenum alloy in the form of round bars 0.125 to 4.5 inches (3.00 to 112.50 mm), inclusive (see 8.6).
AMS G Titanium and Refractory Metals Committee
This specification covers an aluminum alloy in the form of extruded bars, rods, wire, profiles, and tubing (see 8.6).
AMS D Nonferrous Alloys Committee
This specification covers an aluminum alloy in the form of sheet 0.009 to 0.126 inch (0.23 to 3.20 mm), inclusive, in nominal thickness, alclad (see 8.5).
AMS D Nonferrous Alloys Committee
This specification covers an aluminum alloy in the form of extruded wide panel profiles (shapes) and rod and bars 0.500 to 1.000 inch (12.7 to 25.4 mm), inclusive, in thickness produced with cross-sectional area of 14 to 30 square inches (90 to 194 cm2) from circumscribing circle diameters (see 2.4.1) of 14 to 22 inches (356 to 559 mm) (see 8.7).
AMS D Nonferrous Alloys Committee
This specification covers a free-machining, corrosion-resistant steel in the form of cold-worked bars and wire up to 1.750 inches (44.45 mm), inclusive, in nominal diameter or least distance between parallel sides (see 8.4).
AMS F Corrosion and Heat Resistant Alloys Committee
This specification covers an aluminum alloy in the form of plate 0.500 to 1.500 inches (12.70 to 38.10 mm), inclusive, in thickness (see 8.5).
AMS D Nonferrous Alloys Committee
This specification covers a corrosion- and heat-resistant nickel alloy in the form of bars and forgings in the solutioned, stabilized, and precipitation heat-treated condition. Stock for forging shall be in the condition ordered.
AMS F Corrosion and Heat Resistant Alloys Committee
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, flash-welded rings, and stock for forging or flash-welded rings.
AMS E Carbon and Low Alloy Steels Committee
This specification covers beryllium in the form of sheet and plate produced by hot rolling beryllium with nominal thicknesses from 0.020 to 1.000 inches (0.51 to 25.4 mm), inclusive (see 8.5).
AMS G Titanium and Refractory Metals Committee
This specification establishes the requirements for chemical-film (conversion) coatings on aluminum alloys.
AMS B Finishes Processes and Fluids Committee
Performing highly representative tests of aircraft equipment is a critical feature for gaining utmost confidence on their ability to perform flawlessly in flight under the entire spectrum of operating conditions. This can also contribute to accelerate the certification process of a new equipment. A research project (E-LISA) was performed in recent years, as part of the European funded Clean Sky 2 framework, with the objective of building an innovative facility for testing an electrically actuated landing gear and brake for a small air transport. The project eventually led to the development and construction of an Iron Bird able to reproduce in a realistic and comprehensive way a full variety of landing test cases consistent with certification specifications and landing histories available in the repository of the airframer. The Iron Bird that was eventually developed is a multi-functional intelligent and easy reconfigurable facility integrating hardware and software allowing to perform
De Martin, AndreaBertolino, AntonioJacazio, Giovanni
The process of producing aircraft parts involves the drilling of aluminum alloys. This creates a large amount of chips, which are removed using air, but sometimes they still remain within the holes. This is checked by inspectors through visual inspection. However, the quality of human inspection varies based on skill level and fatigue. Thus, image-based inspection should be used to stabilize and further improve inspection quality. This study aims to build a framework for chip detection based on image processing. Taking into account on-site implementation, the system must have low installation and running costs and be standalone. Therefore, we adopt the KIZKI algorithm, which satisfies these conditions. KIZKI means awareness in Japanese. This is a model of human peripheral vision and saccades. It does not require training like AI and can achieve high-speed and high-performance detection using a low-performance computer. In other words, there is no need for a computer with an expensive
Iinuma, MarinSato, JunyaTsuji, Masahiko
Researchers from the Disruptive and Sustainable Technologies for Agricultural Precision (DiSTAP) interdisciplinary research group of the Singapore-MIT Alliance for Research and Technology (SMART), MIT’s research enterprise in Singapore, in collaboration with Temasek Life Sciences Laboratory (TLL) and MIT, have developed a groundbreaking near-infrared (NIR) fluorescent nanosensor capable of simultaneously detecting and differentiating between iron forms — Fe(II) and Fe(III) — in living plants.
Machining metal has its challenges as many shops will attest, but machining glass is another matter – one that Dan Bukaty Jr., President of Precision Glass & Optics (PG&O) is well schooled in. Mr. Bukaty and his 35-person shop manufacture high-end precision glass optics for customers such as IMAX, Intuitive Surgical, Boeing and NASA, to name a few. The products PG&O make can range from the ordinary to the extraterrestrial, such as mirrors that it fabricated for the Hobby–Eberly Telescope to measure dark energy in outer space.
This document is a guide to the application of magnesium alloys to aircraft interior components including but not limited to aircraft seats. It provides background information on magnesium, its alloys and readily available forms such as extrusions and plate. It also contains guidelines for “enabling technologies” for the application of magnesium to engineering solutions including: machining, joining, forming, cutting, surface treatment, flammability issues, and designing from aluminum to magnesium.
Aircraft Seat Committee
Phillips, PaulSlattery, KevinCoyne, JenniferHayes, Michael
This specification covers procedures for sampling and testing aircraft-quality, special aircraft-quality, and premium aircraft-quality steels requiring transverse tensile property testing.
AMS E Carbon and Low Alloy Steels Committee
This specification covers a honeycomb core fabricated from a corrosion and heat-resistant steel.
AMS F Corrosion and Heat Resistant Alloys Committee
Naveen Kumar, SubramaniBalasubramanian, V.Malarvizhi, S.Sonar, TusharHafeezur Rahman, A.Balaguru, V.
The study aims to evaluate the transient failure behavior of welding joints that are exposed to sudden tensile loading. The Mohr–Coulomb criterion’s fundamental theories are examined and evaluated. The failure function of Mohr’s envelope is first expanded into a polynomial in terms of the stress components (σp , τxy ) on the failure region up to the third order. Using ANSYS software, the transient failure response of welding joints was simulated. The Runge–Kutta fourth-order computational technique was employed to perform numerical analysis on transient failure response. Python software is used to develop a computer code for the time-dependent failure response of welding joints. The welded joint specimen is tested with the help of a UTM machine. The analytical results are compared with experimental results. A fractography study was carried out on the welded joint of the failure surface. In this context, the main focus is on SEM and EDS methods to determine the exact type of failure
Chavan, ShivajiRaut, D. N.
The objective of this experimental study was to investigate the change of shifting rate of metal V-belt type CVT during speed up/down under quasi-idle loading condition. Changes in the rotational speeds of the driving and driven pulleys were simultaneously measured by the rotational speed sensors installed on the driving and driven shafts during speed up/down shifting, respectively. In addition, the interaxial force applied to the driving and driven pulleys was measured by a load cell. The shifting rate was defined as the ratio of the calculated radial displacement to the tangential displacement of the belt in the pulley groove. This study found that the shifting rate was determined not only by the slippage between the pulley and the belt element, but also by the elastic deformation of the belt element in the pulley groove. The power transmission performance was improved when the elastic deformation was small even though radial slippage between the pulley and the belt element was
Mori, YuichirouOkubo, KazuyaObunai, Kiyotaka
The use of plastic gears has expanded due to their lightweight properties, low noise emission, and cost-effective manufacturing. For instance, in the transportation equipment industry, some metal gears are being replaced with plastic gears. To achieve further size and weight reduction, gears must be able to withstand higher loads without damage. Gears have various modes of damage. Since there are different types of wear, each with different factors, it is important to identify the factors and take appropriate countermeasures. In gear meshing, there are many factors that affect wear, so restricted-factor tests are required to confirm the effectiveness of countermeasures. The purpose of this study is to elucidate the wear regime in high-load gear meshing and then to establish a simplified evaluation method replicating the meshing of gears for wear resistance focusing on the relative sliding between the two surfaces of metal and plastic. In the evaluation, changes in wear morphology over
Yamamoto, JimpeiSuzuki, TakaharuAko, NatsukiIwasaki, ShinyaKurita, Hirotaka
This specification covers an extra high toughness, corrosion-resistant steel in the form of bars, wire, forgings, flash-welded rings, and extrusions up to 12 inches (305 mm) in nominal diameter or least distance between parallel sides (thickness) in the solution heat-treated condition and stock of any size for forging, flash-welded rings, or extrusion.
AMS F Corrosion and Heat Resistant Alloys Committee
This specification covers an aluminum alloy in the form of extruded profiles 0.750 to 1.500 inches (19.05 to 38.10 mm) in nominal thickness with a maximum cross-sectional area of 19 square inches (123 cm2) and a maximum circle size of 11 inches (279 mm) (see 8.6).
AMS D Nonferrous Alloys Committee
This specification covers an aircraft-quality, low-alloy steel in the form of mechanical tubing.
AMS E Carbon and Low Alloy Steels Committee
This specification covers an aluminum alloy in the form of die forgings 4 inches (102 mm) and under in nominal thickness at time of heat treatment, hand forgings up to 6 inches (152 mm), inclusive, in as-forged thickness, rolled rings with wall thickness up to 3.5 inches (89 mm), inclusive, and stock of any size for forging or rolled rings (see 8.6).
AMS D Nonferrous Alloys Committee
This specification covers an aluminum alloy in the form of extruded bars, rods, wire, profiles, and tubing with a nominal diameter or least thickness (wall thickness of tubing) up to 5.000 inches (127 mm), inclusive (see 8.5).
AMS D Nonferrous Alloys Committee
This specification covers discontinuously reinforced aluminum alloy (DRA) metal matrix composites (MMC) made by mechanical alloying of the 2124A powder and SiC particulate, which is then consolidated by hot isostatic pressing (HIP) into shapes less than 62 square inches (0.04 m2) in cross-sectional area (see 8.12).
AMS D Nonferrous Alloys Committee
This specification covers one grade of commercially pure titanium in the form of bars, wire, forgings, and flash-welded rings up to 5.000 inches (127.00 mm), inclusive, in nominal diameter or least distance between parallel sides and stock for forging or flash-welded rings (see 8.6).
AMS G Titanium and Refractory Metals Committee
This specification covers an aluminum alloy in the form of plate 3.001 to 9.000 inches (76 to 229 mm), inclusive, in nominal thickness (see 8.5).
AMS D Nonferrous Alloys Committee
This specification covers a titanium alloy in the form of bars up through 10.000 inches (2540 mm) in nominal diameter or least distance between parallel sides, inclusive, with bars having a maximum cross-sectional area of 79 square inches (509.67 cm2), and stock for forging of any size (see 8.7).
AMS G Titanium and Refractory Metals Committee
This specification covers an aircraft-quality, low-alloy steel in the form of mechanical tubing.
AMS E Carbon and Low Alloy Steels Committee
This specification covers an aluminum alloy in the form of hand forgings up to 6 inches (152 mm), inclusive, in nominal as-forged thickness and having a cross-sectional area of not more than 156 square inches (1006 cm2) (see 8.7).
AMS D Nonferrous Alloys Committee
This specification covers a titanium alloy in the form of sheet and strip 0.125 inch (3.18 mm) and under in nominal thickness (see 8.6).
AMS G Titanium and Refractory Metals Committee
This specification covers an aluminum alloy in the form of extruded bars, rods, wire, profiles, and tubing up through 2.999 inches (76.2 mm) in diameter, least thickness, or wall thickness and 25 square inches (161 cm2) or less in cross-sectional area (see 8.6).
AMS D Nonferrous Alloys Committee
This specification covers an aluminum alloy in the form of extruded bars, rods, and shapes up to 4.000 inches (101.60 mm), inclusive, in nominal diameter or least thickness and having a nominal cross-sectional area up to 20 square inches (129 cm2) (see 8.5).
AMS D Nonferrous Alloys Committee
This specification covers a magnesium alloy in the form of permanent mold castings (see 8.6).
AMS D Nonferrous Alloys Committee
This specification covers an aluminum alloy in the form of plate 1.0 to 6 inches (25.4 to 152.4 mm), inclusive, in nominal thickness (see 8.5).
AMS D Nonferrous Alloys Committee
This specification covers a magnesium alloy in the form of permanent mold castings (see 8.6).
AMS D Nonferrous Alloys Committee
This specification covers an aluminum alloy in the form of seamless drawn tubing from 0.025 to 0.500 inch (0.64 to 12.70 mm), inclusive, in wall thickness (see 8.5).
AMS D Nonferrous Alloys Committee
This specification establishes testing methods and maximum permissible limits for trace elements in nickel alloy castings and powder materials. It shall apply only when required by the material specification.
AMS F Corrosion and Heat Resistant Alloys Committee
This specification covers a corrosion- and heat-resistant cobalt alloy in the form of round wire 0.001 to 0.140 inch (0.025 to 3.56 mm), inclusive, in nominal diameter supplied in straight lengths or coils.
AMS F Corrosion and Heat Resistant Alloys Committee
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