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Technical Paper

Analysis, processing and addressing of data flows of process-integrated 3D-measurements of magnesium workpieces for car body construction

2021-04-06
2021-01-0241
The aim of a research project was to develop a system for the analysis, processing and addressing of data flows of process-integrated 3D-measurements of magnesium workpieces for car body construction and its prototypical application. By applying optical measuring methods for quality control and using object-specific measurement for process control, considerable savings of energy and other resources can be achieved in automotive engineering. The QM standards for measuring systems for forming processes in the automotive sector place high demands on accuracy and measuring speed. By using multi-camera systems, clock rates of less than 10 seconds and accuracies of 30-40 µm over the entire measuring range can be guaranteed. The modular design of a system facilitates process integration due to the relatively low effort required for different manufacturing tasks. The performance analysis of the measuring system and the process landscape design were carried out.
Technical Paper

Thermodynamic Analysis Of An Aeroderivative Gas Turbine Engine System With Ceramic Matrix Composite Rotating Blades

2021-03-02
2021-01-0033
The quest for achieving more efficient gas turbine engine systems (GTESs) has led the researchers to try getting into many new dimensions of research. Simple Brayton Cycle based plants were coupled with recuperators, regenerators and reheaters to avoid heat energy wastage and this formed Complex GTESs. Multistage compression in axial compressors and multistage expansions in turbines paved the path to optimize the plant design for greater thrust to weight ratio and greater efficiency of the GTESs. Since the increase in efficiency of any power plant is directly or indirectly related to temperatures at which the plant cycle is being operated, this thermodynamic constraint had led to the development of high temperature bearing materials such as single crystal Nickel based superalloys.
Technical Paper

Use of Cavitation Abrasive Surface Finishing to Improve the Fatigue Properties of Additive Manufactured Titanium Alloy Ti6Al4V

2021-03-02
2021-01-0024
Additive manufactured AM metals are attractive materials, as shape is directly formed from Computer aided design CAD data with less leading time. However, weak fatigue properties are big problem for practical applications. In order to improve fatigue life and strength, a novel mechanical surface treatment using cavitation and abrasive impact is developed. Whereas cavitation normally causes severe damage in hydro-machineries, cavitation impact is utilized for introduction of compressive residual stress into metallic materials by peening. The peening method using cavitation impact is named as “cavitation peening”. Although cavitation is produced by injecting a high-speed water jet into a water-filled chamber during cavitation peening, “cavitation peening” is different from “water jet peening”, in which water column impact is used. The other advantage of the proposed treatment is smoothing of the surface of AM metals.
Technical Paper

High Strength Corrosion Resistant Steel for Aircraft Landing Gears and Structures

2021-03-02
2021-01-0028
Aircraft landing gears and structures have stringent performance requirements. They are subjected to severe loads, corrosion, and adverse environmental conditions, and have complex shapes which vary in thickness. 300M steel is widely used for high stress aircraft landing gears and structures. This steel is not corrosion-resistant and requires protective coatings. Recently, a new non-toxic zinc-nickel coating is being developed; however, neither zinc-nickel coating nor toxic cadmium coatings do not solve the corrosion problem if it cracks. Ultimately, the use of stainless steel delivers a more robust solution, reducing maintenance time and cost of repairs caused by corrosion. Cobalt-free, quenched and tempered high strength corrosion resistant steel alloy (“HSCR steel”) provides the same strength, ductility, and toughness as the 300M steel and while it possesses corrosion resistance in salt spray test.
Standard

Aircraft Humidification

2021-01-14
CURRENT
AIR1609B
This SAE Aerospace Information Report (AIR) covers the design parameters for various methods of humidification applicable to aircraft, the physiological aspects of low humidities, the possible benefits of controlling cabin humidity, the penalties associated with humidification, and the problems which must be solved for practical aircraft humidification systems. The design information is applicable to commercial and military aircraft. The physiological aspects cover all aircraft environmental control applications.
Standard

Wrench, Spanner

2021-01-13
WIP
AS6018A
This SAE Aerospace Standard (AS) covers adjustable and non-adjustable spanner wrenches generally used for aerospace machinery maintenance and for tightening and loosening hose couplings and hydrant caps. Inclusion of dimensional data in this document is not intended to imply all of the products described therein are stock production sizes. Consumers are requested to consult with manufacturers concerning lists of stock production sizes.
Standard

Paint Stripping of Commercial Aircraft - Evaluation of Materials and Process

2021-01-12
WIP
MA4872B
This document details the technical requirements to be used in the evaluation of materials and processes developed for use in stripping organic finishes from fixed wing commercial aircraft. The requirements herein are intended to ensure that the materials and processes used are not detrimental to the commercial aircraft when used as specified. These requirements are not intended to judge performance of the stripping method.
Standard

Guide for the Design of Threaded Screw or Stud Type Electrical Equipment Terminations

2021-01-11
WIP
AIR38C

To establish design recommendations that will provide a basis for safe and reliable connections to threaded screw- or stud-type electrical equipment terminations. These recommendations are directed primarily, but not solely, to the aerospace and ground support equipment industries.

Since individual design criteria may alter the details as outlined, it is therefore important that this Aerospace Information Report (AIR) not be considered mandatory, but be used only as a design guide.

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