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Why? Because most ferritic materials used in pressure vessel construction exhibit notch toughness sensitivity to low temperatures. This means that if steel does not possess sufficient notch toughness behavior, existing cracks or fabrication flaws can result in sudden (catastrophic) failure from brittle fracture.why should we do Impact testing?
By doing the test what the resullt has to do with MDMT
i couldnt relate what impact testing is to do with mdmt?
Impact tests are used to determine your MDMT of the vessel.
the impact test is to prove material chosen is suitable for the temperature./That is exactly true. And if the tests fail, then your MDMT is incorrect.
Let me go back to my original post. The question was, how does impact testing relate to the MDMT, and not how is MDMT determined. OK??