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post #5 of Old 11-17-2010
RichH
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Quote:
Originally Posted by atlanticcruiser View Post
how do you get comfortable with the integrity of the plates when you can't see them? Any info would be greatly appreciated!
Chainplates should be 'visualized' for fatigue cracking either by 'dye penetrant' techniques or by 'magnetic flux' analysis via specialized equipment. Therefore the plates must be removed to inspect. Xray is only 'incidental' in such analysis as it cannot define the small micro-cracks, etc. that are a stark 'forewarning' of imminent catastrophic failure. Cyclically loaded 300 series stainless steel that goes beyond 1 million load cycles of loading at beyond 30% of maximum design strength .... will usually be 'ready' for sudden catastrophic brittle/fatigue failure .... well beyond 'worn out' and 'exhausted/tired' metal'.

Those chainplates 'must' be removed and visualized, etc. ... for 'safety sake'.
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