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Dynamic neck formation can "ignore" a deep grove in a tensile specimen.....

D.Rittel's picture

In this movie taken at 1 Mfps using our new Kirana camera (courtesy Y. Rotbaum), one can see a dynamic tension test of a grroved specimen in a tensile Hopkinson bar. The groove is relatively sharp and 10% of the diameter in depth.

It so happens that the dynamic neck inception occurs outside the notch area, in other words a strong geometrical flaw does not dictate the failure locus. We have performed over a hundred of such experiments. This is a very interesting and challenging observation.... 

 

http://youtu.be/retgxK96I_g  

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That's an amazing video!  What is your explanation ?

-- Biswajit

D.Rittel's picture

D. Rittel

merittel@technion.ac.il

rittel.net.technion.ac.il

Why then is the strain localized away from the groove?  Do you think the groove is acting as a boundary and reflecting waves?

I have added this question to the list in Stack Exchange.  If you find it difficult to reply on iMechanica you can post a comment on Stack Exchange.  The link is http://area51.stackexchange.com/proposals/67726/theoretical-and-applied-mechanics/68904#68904 .

-- Biswajit

D.Rittel's picture

D. Rittel

merittel@technion.ac.il

rittel.net.technion.ac.il

What was the material tested ?

Was the location of the "extra"-neck approximately the same ? 

Matt Lewis's picture

I am curious about the test conditions, namely the velocity imposed and the dimensions of the specimen.

Matt Lewis
Los Alamos, New Mexico

D.Rittel's picture

www.rittel.net.technion.ac.il :=)

D. Rittel

merittel@technion.ac.il

rittel.net.technion.ac.il

D.Rittel's picture

D. Rittel

merittel@technion.ac.il

rittel.net.technion.ac.il

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