Talk:Flow plasticity theory

references to rock and need for references
Thanks for working so hard on this page Bbanerje. Please continue to try to make this page more general. There are many other materials besides rock that have pressure dependent plasticity. I changed a few references from 'rock' to 'material', but I think a one or two more difficult to change examples remain. I edited the definition of loading to make the definition more general and to remove mention of unnecessary assumptions. Similar work could be done to clean up other parts of the article. This page needs more in-line references! Thanks again. Blkutter (talk) 23:39, 26 November 2018 (UTC)
 * Thank you. There are some other corrections and several clarifications that are needed but I'm leaving it to the community to do that. Bbanerje (talk) 02:29, 6 December 2018 (UTC)

flow rule justification unclear in case of perfect plasticity
Hello there,

I really can't understand the justification for the flow rule in case of perfect plasticity. Please make it clearer. As I understand it so far we are saying that d_sigma = 0 if plasticity starts. I agree with this. But now I don't understand where the co-directionality comes from. You cannot state from something like  = 0 and  = 0 that v and w are co-directional. For this u must be nonzero. But as I understand it, this argument is used here... I would be glad if someone updates this to explain it better.

Thanks,

Adrian


 * The statement d_sigma = 0 should be an outcome of that result rather than a cause. Will correct when I get the time. Thanks for pointing it out. Bbanerje (talk) 01:03, 17 July 2018 (UTC)