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Subject: Fracture Ductile Area in DWTT Specimens Showing Separations/Splitting

Date: 05/22/00 at 6:07 PM
Posted by: Antonio Augusto Gorni
E-mail: agorni@iron.com.br
Message Posted:

Hi!

A very common way to determine the toughness of API microalloyed plates for pipelines is the DWTT (Drop Weight Tear Test). Toughness can be assessed from the energy absorbed during the break of the specimen and/or by the percentage of ductile area in the fracture surface of the broken specimens.

However, eventually the fracture of microalloyed controlled rolled steels shows separations or splitting, due to the preferential propagation of the fracture along crystallographic planes or inclusions. In this case, fracture surface becomes very irregular, rough, with peaks and valleys. The determination of ductile fracture fraction from this surface is somewhat difficult and can present significative variations according to the methodology adopted for this measurement.

So, if possible, I would like to know if someone could tell me please if there is some specific and reliable procedure for the determination of this ductile fracture fraction in the fracture surface when it shows separations/splitting.

Thank you very much in advance!


All the best,

Antonio

----
Antonio Augusto Gorni, Mat. Eng., M. Eng.
COSIPA Steelworks, Brazil
E-Mail: agorni@iron.com.br | agorni@ig.com.br
Home Page: http://www.gorni.eng.br
São Vicente SP, Brazil



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