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Technical Paper

Effect of Fatigue Loads on Behavior of 2024-T351 Aluminum Conduits for Aircraft Hydraulic Applications

2024-06-01
2024-26-0431
Abstract: Hydraulic systems in aircrafts largely comprise of metallic components with high strength to weight ratios which comprise of 2024 Aluminum and Titanium Ti-6AL-4V. The selection of material is based on low and high pressure applications respectively. For aircraft fluid conveyance products, hydraulic conduits are fabricated by axisymmetric turning to support flow conditions. The hydraulic conduits further carries groves within for placement of elastomeric sealing components. This article presents a systematic study carried out on common loads experienced by fluid carrying conduits and the failure modes induced. The critical failure locations on fluid carrying conduits of 2024-T351 Aluminum was identified, and the Scanning Electron Microscope (SEM) analysis was carried out to identify the characteristic footprints of failure surfaces and crack initiation. Through this analysis, a load to failure mode correlation is established.
Standard

Vehicle Management Systems - Flight Control Function, Design, Installation and Test of Piloted Military Aircraft, General Specification For

2024-04-16
WIP
AS94900B
This SAE Aerospace Standard (AS) provides the general performance, design, installation, test, development, and quality assurance requirements for the flight control related functions of the Vehicle Management Systems (VMS) of military piloted aircraft. It also provides specification guidance for the flight control interfaces with other systems and subsystems of the aircraft.
Standard

Aerospace - Accumulator, Hydraulic, Cylindrical, Piston Separated

2024-04-15
CURRENT
ARP4379B
This SAE Aerospace Recommended Practice (ARP) is a guide for defining the requirements for aerospace piston hydraulic accumulators, including details pertinent to the design, fabrication, performance and testing of the accumulator. This type of accumulator contains a piston which separates pressurized gas and fluid.
Standard

Current: Accumulator, Hydraulic, Welded Bellows, Factory Pre-Charged Change to: Recommended Design and Test Requirements for Factory Precharged, Bellows Separated, Hydraulic Accumulators

2024-03-20
WIP
ARP4378D
Current: This SAE Aerospace Recommended Practice (ARP) provides design and test requirements for high pressure, factory pre-charged, welded bellows hydraulic accumulators. Only proposed change to scope is to change "pre-charged" to "precharged" to align with ARP4386. "Precharge" is one word and non-hyphenated in ARP4386.
Standard

Bellmouth Tube End, Welding

2024-03-19
WIP
AS1578B
This bellmouth tube end is intended for orbiting arc welding of corrosion resistant steel hydraulic tubing per AS 1576.
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