Dear Colleagues,
The new deadline for abstract (plain text, 400 word limit) submission is now January 28, 2013.
The 4th conference "Nonlinear Dynamics -2013" will be held from 19 until 22 June, 2013 in Sevastopol (Ukraine).
Conference web-site: https://sites.google.com/site/ndkhpi2013/home
Amit Acharya and Robin J. Knops
(to appear in Journal of Elasticity)
The common practice of ignoring the elastic strain gradient in measurements of geometrically necessary dislocation (GND) density is critically examined. It is concluded that the practice may result in substantial errors. Our analysis points to the importance of spatial variations of the elastic strain field in relation to its magnitude in inferring estimates of dislocation density from measurements.
In this paper, dislocation climb is incorporated in a two-dimensional discrete dislocation dynamics model. Calculations are carried out for polycrystalline thin films, passivated on one or both surfaces. Climb allows dislocations to escape from dislocation pile-ups and reduces the strain-hardening rate, especially for fully passivated films. Within the framework of this model, climb modifies the dislocation structures that develop during plastic deformation and results in the formation of pile-ups on slip planes that do not contain any dislocation sources.
European Commission' s JRC (Joint Research Centre) is organizing the 2nd workshop on physics based modeling of material properties and experimental observations in collaboration with TOBB University of Economics and Technology. The workshop will be held in Antalya/Turkey on 15-17 May 2013, and the special focus will be fracture and damage mechanics.
Dear Colleagues,
The Organizing Committee of the 4th conference ND-2013 is pleased to invite you to participate at the Nonlinear Dynamics Conference to be held from 19 until 22 June, 2013 in Sevastopol (UKRAINE).
Conference web-site: https://sites.google.com/site/ndkhpi2013/home
Now I am doing some work about nanotwinned copper, and don't understand what's the nature of "detwinning".
Could any disappearance of the original nanotwin structure and the formation of a single grain or a new twin structure with TBs in a different orientation and/or with different TB spacing be called detwinning?
While reading the article
"An alternative approach to finite plasticity based on material isomorphisms " (1999) by Prof. Bertram, the first thing that attracted my attention was the quote [by Prof. Naghdi (late)]:
“there is some degree of disagreements on nearly all of the main constitutive ingredients and features of plasticity in the presence of finite deformation... Some of the issues of disagreements are of basic and fundamental importance.”
Hi,
I'm presently working on implementing anisotropic yield criteria in LSDYNA as UMAT.
I understand from the LSDYNA documents that effective plastic strain is a default history variable. So when we code, can we omit the update of effective plastic strain as a history variable? If so, where is it stored and how is it retrieved during post-processing ?
