SailNet Community - View Single Post - Chain plate metal bad
View Single Post
  #4  
Old 10-25-2011
RichH's Avatar
RichH RichH is online now
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,695
Thanks: 9
Thanked 56 Times in 50 Posts
Rep Power: 15
RichH will become famous soon enough
Quote:
Originally Posted by davidpm View Post
I have read that too Rich but Pacific Seacraft is known for building a good blue water boat and I believe there hardware is oversized.

I'm not sure I can really explain or know what to do with this knowledge.
If you pull a chain plate and it looks like it is in perfect condition but it is junk and there is no non-destructive way to tell what do you do?
Fatigue is characterized by microscopic fractures in the 'grain' or surface of the base metal. Fatigue is evaluated by microscope, by magnetic or dye-penetrant methods such a 'magnafluxing' or other metallurgical analysis.

No one is stating that PSC built lousy boats ... ALL metals in cyclically loaded applications that exceed their 'endurance limits' will FAIL (sometimes catastrophically) by fatigue FAILURE.
Reply With Quote Share with Facebook