Yielding of polycrystals in multi-axial stress states

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The discussion centers on the yielding behavior of polycrystals under multi-axial stress states, with participants seeking clear explanations and resources. Various links to academic papers and lecture series are shared, focusing on polycrystalline models, slip mechanisms, and twinning phenomena. The inquiry emphasizes the need for a mechanistic understanding rather than just theoretical models. Participants express interest in both specific types of polycrystalline yielding and broader approaches. Overall, the conversation highlights the complexity of polycrystalline behavior in materials science.
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Can someone either give me a good explanation of this or link me to a site that can? Thanks.
 
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bill nye scienceguy! said:
Can someone either give me a good explanation of this or link me to a site that can? Thanks.

This may help.

http://www.mech.northwestern.edu/fac/brinson/download/LCB_Gao_IJPpoly.pdf
 
I'm left wondering whether you're after polycrystalline models for yielding (and if so, of what "type and degree" or an overall view of the different approaches available) or mechanistic explanations?
 
the latter, please.
 
Let's see if these are a step in the right direction.

The polycrystalline part of this lecture series:
http://www.poco.phy.cam.ac.uk/teaching/A_Donald/

This has a short intro about polycrystalline slip:
http://www.doitpoms.ac.uk/tlplib/slip/slip_in_poly.php

A pretty interesting one although focuses primarily on twinning:
http://www.mat.ensmp.fr/Personnel/Forest/publi/torino2000.pdf

General topic related stuff:
http://physics.guide.ac/276-Crystalline+Solids.html
http://people.clarkson.edu/~isuni/Chap-8.htm
http://en.wikipedia.org/wiki/Dislocation#Dislocations.2C_slip_and_plasticity
http://www.virginia.edu/bohr/mse209/chapter7.htm
http://web.Earth'sci.unimelb.edu.au/wilson/ice1/dislocation.html
 
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