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UCS-66 and UG-45

UCS-66 and UG-45

UCS-66 and UG-45

(OP)
Hi all,

Can anyone give guidance regarding why UCS-66 uses tr when calculating the MDMT coincident ratio and not tug-45?

I am actually performing a API 579-1 brittle fracture evaluation and I have been using tug-45 for my tmin in the stress ratio calculation.  I just realized that COMPRESS and other packages actually use tr not tug-45 in the MDMT calcs.  I assume API 579 is based off of ASME Section VIII, therefore should be very similar.  I can obviously take a much larger MDMT reduction if tug-45 is used.

Any advice, help, experience???

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