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  #21  
Old 05-29-2013
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Re: Rigging Math

Thats all well and good but you have to realize that there's damn little in-service history of titanium being used in 'sailboat rigging' applications. All anyone can claim or offer at this point is 'a maybe'; but, we'll have to, or should, wait and see to get the full metallurgical story for such a specific 'niche' application. ;-)
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Old 05-29-2013
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Re: Rigging Math

As best as I can see Stainless issues are mostly from badly installed or maintained leaking chainplates

I do not see any track record of them breaking without crevice corrosion issues causing 100% of the weak spot ?
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Old 05-29-2013
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Re: Rigging Math

I am using titanium chainplates in the 62' SLIVER now under construction. I am not concerned at all. We chose titanium becaise the builder had never done carbon fiber chainplates before. I would have preferred carbon fiber chainplates. I have done many.
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Old 05-29-2013
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Re: Rigging Math

BobP -
have you experienced etc. any long term 'creep-strain' anomalies/failure with carbon-fiber composites as chainplates? .... assuming 90/0° fiber orientation.
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Old 05-29-2013
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Re: Rigging Math

Rich:
No I have not. Mind you our practice has been to engineer with a good safety factor, then double that. It's so light there is just no point in going conservative.
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Old 05-29-2013
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Re: Rigging Math

Quoting Corrosion-Doctors.org -
Quote:
The (passive) oxide film formed on titanium is more protective than that on stainless steel, and it often performs well in media that cause pitting and crevice corrosion in the latter (e.g., seawater, wet chlorine, organic chlorides). While titanium is resistant to these media, it is not immune and can be susceptible to pitting and crevice attack at elevated temperatures. It is, for example, not immune to seawater corrosion if the temperature is greater than about 110C
Better corrosion resistance than stainless. Corrosion resistance extremely high in seawater below 110C; should be better than stainless in a marine application.
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Old 05-30-2013
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Re: Rigging Math

Quote:
Originally Posted by bobperry View Post
Rich:
No I have not. Mind you our practice has been to engineer with a good safety factor, then double that. It's so light there is just no point in going conservative.
:-) I have absolutely no experience in carbon fiber; hence the question.

Ive 'back-calculated' some of your 'early' work and simply stand in awe as your safety factors are seemingly equivalent of what those in the 'super critical' disciplines would use, .... such as cranes, nuclear, steel mill stuff, etc. ..... makes me feel quite secure when in F8 & F9+ when sailing my 'Perryboat'.

Besides that, you do have 'a wonderful artistic eye' as all your 'lines' are indeed graceful.
I find myself often 'pouring over' that 'concept drawing' you released to me - its an absolute true work of art.

;-)
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Old 05-30-2013
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Re: Rigging Math

Thanks Jeff. I appreciate your kind words.
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