--U- Notch for Charpy impact tests used to be followed DIN standards, back in 1970s. In fact DIN standards used to provide an option for both Notch types. Correlation of impact data was never easy. It's discarded since then.
It's a matter of basic understanding : a V notch generates more stress than an U-Notch, Hence materials exhibiting good impact with V Notched specimens would easily meet the criteria in U-Notch conditions not the other way. Notch toughness is an extremely critical property for engineering design.
Anything good under worse condition(V-Notch) is more reliable that something performed under ideal condition (U-Notch). Engineering codes, material properties have matured and improved leaps and bounds over the. Hence adoption of V-Notch Charpy impact test is an example of that principle.
Hope it clears your doubts.
Thanks.
Pradip Goswami.P.Eng, IWE.
Independent & Consulting Welding & Metallurgical Specialist
Saudi Aramco Approved Designated Welding Engineer(DPWR)
Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/
Email:pgoswami@rogers.com,pradip.goswami@gmail.com
Cell/Whasapp:1-905-9793232
From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Shahil Saini
Sent: December 17, 2020 3:49 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:31868] Subject:- Charpy Impact Testing on weld metal
That I know sir, but I want some more information behind this topic why they discarded U notch and For every material they are not using U notch or for which materials U notch is used?
On Thu 17 Dec, 2020, 9:17 AM George Dilintas, <dilintas@gmail.com> wrote:
V notch simulation is more reliable
Στις Τετ, 16 Δεκ 2020, 06:58 ο χρήστης Shahil Saini <sainishahil98@gmail.com> έγραψε:
Hello everyone,
My question is, Why ASME BPVC and other standard codes discarded the 'U' notch impact testing?
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