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Directional and oscillating residual stress on the mesoscale in additively manufactured Ti-6Al-4V

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In this work, we were able to improve existing residual stress measurement capabilities so that we could measure smaller length scales. We were able to measure residual stresses that oscillated from build layer to build layer (0.5 mm thick) in an additively manufactured part. The oscillations persisted over nearly 30 layers!

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Amplified effect of mild plastic anisotropy on residual stress and strain anisotropy

A few of you might find this interesting. We indented a disk of aluminum in order to make a specimen with residual stress. The loading was axisymmetric. The aluminum had plastic anisotropy of about 10%. Because of that mild anisotropy, the residual stresses were anisotropic by about 40% and the residual strains were anisotropic by 100%.

The paper is free until July 31 at https://authors.elsevier.com/a/1VCA54kE0BEFT

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Forensics: residual stress of fractured part

I’ll present this below without the answer, in case you want to enjoy a little brain teaser. It is a solid and experimental mechanics problem that, while not terribly practical, I found very interesting:

A part fractures cleanly in two by brittle fracture (no plasticity) under the action of residual and applied stresses. You only have the broken part in front of you, no prior information.

 What were the original residual stresses on the fracture plane?

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Residual Stress Summit 2013 - discounted registration until September 6

The 2013 Residual Stress Summit will take place October 8 - 10,
2013 at the Hilton Garden Inn Idaho Falls, in Idaho Falls, Idaho, USA. You can get more information at http://www.rssummit.org

Conisdering recommending this event to your industrial colleagues.

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Residual Stress Summit 2013

The 2013 Residual Stress Summit will take place October 8 - 10, 2013 at the Hilton Garden Inn Idaho Falls, in Idaho Falls, Idaho, USA. The meeting follows the successful format of the four previous RS Summits held in Los Alamos in 2003, Vancouver in 2005, Oak Ridge in 2007, and Lake Tahoe in 2010.  You can get more information at http://www.rssummit.org

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History of Bueckner’s principle?

I am hoping someone has some historical knowledge of some
interesting mechanics, or just an interest to discuss it. A superposition principle is widely used to solve crack problems, with illustrations like these:

http://ars.sciencedirect.com/content/image/1-s2.0-S0142112308002211-gr1.jpg

http://ars.els-cdn.com/content/image/1-s2.0-S0142112399000778-gr2.gif

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Iain Finnie passed away

Iain Finnie passed away in December. At the time he was the James Fife Professor Emeritus U.C. Berkeley Dept. of Mechanical Engineering.

Iain had an amazing number of contributions spanning diverse area of mechanics. To the best of my recollection:

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