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Technical Paper

The irrotational intensity: an efficient tool to understand the vibration energy propagation in complex structures using an FE Model.

2024-06-12
2024-01-2942
Although structural intensity was introduced in the 80's, this concept never found practical applications, neither for numerical nor experimental approaches. Quickly, it has been pointed out that only the irrotational component of the intensity offers an easy interpretation of the dynamic behavior of structures by visualizing the vibration energy flow. This is especially valuable at mid and high frequency where the structure response understanding can be challenging. A new methodolodgy is proposed in order to extract this irrotational intensity field from the Finite Element Model of assembled structures such as Bodies In White. This methodology is hybrid in the sense that it employs two distinct solvers: a dynamic solver to compute the structural dynamic response and a thermal solver to address a diffusion equation analogous to the thermal conduction built from the previous dynamic response.
Standard

Vacuum Gauge Calibration

2024-05-17
CURRENT
ARP7446A
This SAE Aerospace Recommended Practice (ARP) addresses the general procedure for the best practices for minimizing uncertainty when calibrating thermal conductivity and cold cathode vacuum gauges, which includes the vacuum sensor(s) and accompanying electronics necessary for a pressure measurement to be made. It also includes the best practices for an in-process verification where limitations make it impossible to follow the best practices for minimizing uncertainty. Verifying the accuracy and operation of vacuum gauges is critical to ensure the maintenance of processes while under vacuum.
Standard

Laser Beam Machining

2024-05-16
WIP
B24AA
This specification covers the engineering requirements for laser beam machining such as cutting and drilling.
Standard

Sheet and Strip Surface Finish Nomenclature

2024-05-16
CURRENT
AS4194B
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.
Technical Paper

Surface Properties of Shot-Peened and Plasma Sprayed Powder-Coated Alpha-Beta Titanium Alloy Implants

2024-05-15
2024-01-5060
The paramount importance of titanium alloy in implant materials stems from its exceptional qualities, yet the optimization of bone integration and mitigation of wear and corrosion necessitate advanced technologies. Consequently, there has been a surge in research efforts focusing on surface modification of biomaterials to meet these challenges. This project is dedicated to enhancing the surface of titanium alloys by employing shot peening and powder coatings of titanium oxide and zinc oxide. Comparative analyses were meticulously conducted on the mechanical and wear properties of both treated and untreated specimens, ensuring uniformity in pressure, distance, and time parameters across all experiments. The outcomes underscore the efficacy of both methods in modifying the surface of the titanium alloy, leading to substantial alterations in surface properties.
Standard

Reaffirm E 2024 - spring

2024-05-13
WIP
REFIRM-E-S2024
The following document were been proposed by the sponsor or by committee E for Reaffirmation at the Spring meeting 2024.
Standard

Reaffirmation Ballot - F 2024 Spring

2024-05-13
WIP
REFIRM-F-S2024
The following document has been proposed by the sponsor or by committee F for Reaffirmation at the Spring meeting 2024.
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