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Technical Paper

Enhancing Mechanical Behavior of As-Built Polyamide 6+Glass Fiber Produced with Fused Filament Fabrication via Varying Infill Pattern

2024-03-15
2024-01-5035
Additive manufacturing is currently being investigated for the production of components aiming for near net shape. The presence of chopped glass fibers with PA6 increases the melt viscosity and also changes the coefficients of thermal expansion and increase the heat resistance. The great dimensional stability obtained with the fusion of the PA6 with the fiber results in an extremely durable material even in adverse environments for many other materials used in 3D printing. PA6 is a material oriented for users who need to make structural parts and exposed to high mechanical stresses. The impact, test tensile, and flexural results for as-built PA6 with various infill patterns, including grid, triangle, trihexagon, and cubic, are tested.
Standard

Nickel-Iron Alloy, Corrosion- and Heat-Resistant, Bars, Forgings, Rings and Stock for Forging or Flash-Welded Rings 42.5Ni - 12.5Cr - 5.8Mo - 2.9Ti - 0.015B - 35Fe (Alloy 901) Consumable Electrode Remelted or Vacuum Induction Melted Solution Heat Treated, Stabilized, and Precipitation Heat Treated

2024-03-12
CURRENT
AMS5661H
This specification covers a corrosion- and heat-resistant nickel-iron alloy in the form of bars, forgings, and flash-welded rings 5.0 inches (127 mm) and under in nominal diameter, or maximum cross-sectional distance between parallel sides (thickness), and stock of any size for forging or flash-welded rings.
Standard

Aerospace Vehicle Wiring, Lessons Learned

2024-03-04
CURRENT
AIR6808A
This AIR is limited to the requirements of AS50881 and examines these requirements, providing rationale behind them. AS50881 is only applicable to the aircraft EWIS. Pods and other devices that can be attached to an aircraft are considered as part of the aircraft equipment design. Its scope does not include wiring inside of airborne electronic equipment but does apply to wiring externally attached to such equipment. The AS50881 scope does not include attached devices but does include the interface between the pod/equipment and aircraft wiring. Section 3.3.5 addresses components such as antennas and other similar equipment that were once supplied as Government Furnished Aeronautical/Aerospace Equipment (GFAE).
Technical Paper

Irradiation with High Energy Electron Beams Increases the Hardness of Metamorphic Copper-Based Alloys

2024-02-23
2023-01-5131
This study delves into the innovative realm of synthesizing surface alloyed materials by utilizing copper-based metamorphic powders subjected to high-intensity electron beam irradiation. The process involves depositing metamorphic particles onto a stainless-steel substrate, and subsequently exposing the assembly to a powerful electron beam, resulting in the development of distinct surface alloyed layers. A notable advancement was achieved by introducing a second layer of metamorphic powders over the existing alloyed layer, followed by further treatment with the electron beam. The alloyed layers, characterized by a volumetric concentration ranging from 60 to 67%, exhibited a fascinating phenomenon— the formation of abundant borate crystals with the chemical formula Al2.56Fe1.75Ni0.84. This crystal presence significantly elevated the hardness of the surface alloyed layers, showcasing an impressive five to sevenfold increase compared to the substrates.
Standard

Nut, Self-Locking, 0.7500 thru 1.5000 Thread Sizes, UNS S66286, 160,000 psi, 800 °F, UNJ Thread – Procurement Specification

2024-02-06
CURRENT
AS5377A
This specification establishes the requirements for self-locking wrenchable nuts with thread sizes 0.7500 thru 1.5000 inches. The nuts are made of corrosion and heat resistant precipitation hardenable iron base alloy of the type identified under the Unified Numbering System as UNS S66286 and of 160,000 psi axial tensile strength at room temperature, with maximum conditioning temperature of parts at 800 °F.
Technical Paper

Research on the Forming Process of Bimetal Composite Pipe by Hydroforming

2024-01-15
2024-01-5001
Bimetal composite pipe has higher strength and is more corrosion and high temperature resistant compared to single metal pipe, making it a new type of pipe that is being gradually applied to important industrial fields such as aviation and aerospace manufacturing. To study the hydraulic forming mechanism of bimetal composite pipes, the forming process is divided into three stages: liner pipe elastic–plastic deformation, base pipe loading, and unloading. The stress and strain relation between the liner and base pipe during the gradual increase in hydraulic pressure is analyzed, and the range of selected internal pressure required for composite pipe formation and the relation between residual contact pressure and internal pressure for the liner–base pipe interface are obtained.
Standard

Nickel Alloy, Corrosion- and Heat-Resistant, Bars, Forgings, Rings and Stock for Forging 41.5Ni - 16Cr - 37Fe - 2.9Cb (Nb) - 1.8Ti Consumable Electrode Remelted or Vacuum Induction Melted 1750 °F (954 °C) Solution Heat Treated

2023-12-13
CURRENT
AMS5702F
This specification covers a corrosion- and heat-resistant nickel alloy in the form of bars, forgings, and flash-welded rings up to 4.00 inches (101.6 mm), inclusive, in nominal thickness or distance between parallel sides and having a maximum cross-sectional area of less than 12.6 square inches (81 cm2). Stock for forging or flash-welded rings may be of any size and condition as ordered.
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