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THE maximum advantage from the use of titanium in a reciprocating engine should come from the substitution of alloys equal in strength to present steels for crankshafts and connecting rods. Titanium alloys are in use which have tensile properties at the temperatures involved equal to those of alloy steels used in the engine considered for example. On this engine the weight‐saving would be about 77 lb. Full scale testing is necessary before the effects of titanium's tendency to cold welding, and low elastic modulus, can be evaluated. Laboratory research into wear‐resisting properties of surface‐hardened titanium has not gone far enough to be conclusive and its use for crankshaft centres and gears should be deferred.

Unconventional machining processes, particularly ultrasonic vibration cutting (UVC), can overcome such technical bottlenecks. However, the precise mechanism through which UVC affects the in-service functional performance of advanced aerospace materials remains obscure. This limits their industrial application and requires a deeper understanding.

The surface integrity and in-service functional performance of advanced aerospace materials are important guarantees for safety and stability in the aerospace industry. For advanced aerospace materials, which are difficult-to-machine, conventional machining processes cannot meet the requirements of high in-service functional performance owing to rapid tool wear, low processing efficiency and high cutting forces and temperatures in the cutting area during machining.

To address this literature gap, this study is focused on the quantitative evaluation of the in-service functional performance (fatigue performance, wear resistance and corrosion resistance) of advanced aerospace materials. First, the characteristics and usage background of advanced aerospace materials are elaborated in detail. Second, the improved effect of UVC on in-service functional performance is summarized. We have also explored the unique advantages of UVC during the processing of advanced aerospace materials. Finally, in response to some of the limitations of UVC, future development directions are proposed, including improvements in ultrasound systems, upgrades in ultrasound processing objects and theoretical breakthroughs in in-service functional performance.

This study provides insights into the optimization of machining processes to improve the in-service functional performance of advanced aviation materials, particularly the use of UVC and its unique process advantages.

The use of high quality or exotic materials such as heat resistant alloys, high strength steels, stainless and aluminium alloys provide many answers to designers requiring solutions to specific problems, especially in the aerospace industry. However, the downside is that they are often difficult and costly to machine and can pose tremendous problems to production engineers due to their machining characteristics. Machineability, swarf control, work‐hardening and surface finish are a few of the prime headaches facing the production people with drawn‐out cycle times, high tooling bills, low machine utilisation and constant attention geneate concern for management.

Under this heading arc published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Council, Reports and Technical Memoranda of the United States National Advisory Committee for Aeronautics and publications of other similar Research Bodies as issued

Accles & Pollock Ltd. of Oldbury, Worcestershire, a TI Steel Tube Division company, will be exhibiting a comprehensive range of precision steel tube and tubular products, including plain, annularly convoluted and thin wall tube, at Farnborough.

It was a good Farnborough Show … for those who went to see the flying displays and the weather was a great consolation. But it was an unusual Farnborough in some respects, first because of the good weather and this does bear repetition, and it does make such a difference to setting up the Show to its progress through the week and to the mood of the people there.

TITANIUM, with a melting point of 1,660 deg. C, higher than that of nickel or iron, a density little more than one‐half that of steel, and a corrosion resistance in certain environments superior to stainless steel, is evidently a metal of significance to aeronautics. In the last few years remarkable advances have been made in both the production technology and the basic physical metallurgy of the titanium alloys, and it would be fair to say that aeronautics generally has not exploited the possibilities of these alloys to the extent that might have been expected. This is in part due to economic factors, as titanium is still relatively expensive, and in part due to a lack of conviction in the relative advantages which the alloys can offer. It is obvious that as more titanium is brought into use in aeronautics, so the economic aspect will improve, and the more experience will designers and materials engineers generally gain in its utilization. The purpose of the present article is to survey some of the basic metallurgical considerations which enter into the development of the titanium alloys, and relate these to the specific engineering factors of interest in aeronautics. This will lead to a discussion of the ways in which the titanium alloys are being introduced into aircraft structures and engines. The subject is clearly a very large one to attempt in a single article, and many quite important topics have necessarily been abridged or omitted altogether. The references should, however, make it possible to follow up individual subjects in more detail.

AEM will be exhibiting in Hall 4, Stand G1. The exhibit will illustrate AEM's comprehensive range of accessory repair and overhaul services for electrical, hydraulic, avionic and safety equipment. Farnborough will also be used as the official launch of AEM's Boeing 737 Landing Gear Total Support Pro‐gramme, which encompasses a complete exchange and overhaul service. Copies of Aviation Accessory News will be available on the stand.

On show for the first time, a new and unique super lightweight headset to be known as the Minilite will be the main feature of the Amplivox Communications stand at the Paris Salon.