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oldcorollas
Forums Junkie

Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: Titanium conrods and cycle fatigue

Tue, 07 September 2004 05:44

the reason you never see the same numbers twice for fatigue related properties is because "it depends".

depends on size of specimen, size of starter notch, load applied, rate of loading, even the time of each loading cycle. to compare data, you would need the EXACT same experimental conditions, and even then, it's difficult to ensure that the starter crack properties are EXACTLY alike...

full title for that article (5) is
TI: Surface engineering of titanium alloys for the motorsports industry
AU: Dong, H; Bell, T; Mynott, A
SO: Sports Engineering. Vol. 2, no. 4, pp. 213-219. 1999

Quote:

AB: Abstract
The ever increasing demands of motorsports has been the main driving force for substituting titanium components for steel in racing cars and engines by virtue of their higher strength to weight ratio. This allows savings in general weight and inertial energy, and allows a more beneficial weight redistribution in the car. However, the poor tribological properties of titanium alloys has restricted such replacement, and the full potential of titanium alloys in racing cars will not be realised until some novel surface engineering technologies have been developed. An innovative surface engineering technique developed by Dong et al. can successfully improve the tribological behaviour of titanium alloys in terms of low friction, high wear resistance and high resistance to scuffing. This has made possible the regular use of titanium components in Formula 1 and Indy cars engines. Furthermore, with the aid of a recently developed predictive contact mechanics model, some novel duplex systems have been designed to meet the challenging demands for the design of high dynamically loaded titanium gears. The duplex treated titanium gears have satisfactorily completed rigorous cam rig tests under a pick-up load of 50 Nm at speeds up to 17000 r.p.m., which could pave the way for the use of titanium alloys in gear boxes. The present paper demonstrates, by way of example, a number of major steps towards titanium designer surfaces. The motorsports industry has recognised the potential of surface engineered titanium components and it is envisaged that the new Millennium will see wide applications of titanium in the motorsports industry. Materials include Ti-6Al-4V.

i should have access, but apparently not from home.
funnily enough i DO have online access to "sports illustrated" tho Laughing

UTS and sydney uni students have access.
Cya, Stewart

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