Dear Colleagues,
We would like to cordially invite you to the Computational Geomechanics mini-symposium in EMI 2019, which will be held on June 18–21, 2019 at Caltech, Pasadena, CA, USA. The abstract submission is now open at emi2019.exordo.com until January 30, 2019. The mini-symposium description is given below:
EMI 2019, June 18–21, 2019. Caltech, Pasadena, CA, USA.
(Joint conference with Geo-Institute)
A demonstration through an example is given of how the Volterra dislocation formulation in linear elasticity can be viewed as a (formal) limit of a problem in plasticity theory. Interestingly, from this point of view the Volterra dislocation formulation with discontinuous displacement, and non-square-integrable energy appears as a large-length scale limit of a smoother microscopic problem. This is in contrast to other formulations using SBV functions as well as the theory of Structured deformations where the microscopic problem is viewed as discontinuous and the smoother plasticity formulation appears as a homogenized large length-scale limit.
The attached poster page has a self explanatory introduction of the Unified Mechanics Theory.
We have always modelled crack propagation under monotonic/static loading in metals assuming isotropic hardening. However, we show that anisotropic/kinematic hardening effects play a significant role due to non-proportional straining with crack advance; the isotropic hardening idealization leads to steady state fracture toughness predictions that could be 50% lower. I hope that some of you find this work interesting.
Emilio Martínez-Pañeda, Norman A. Fleck. Crack Growth Resistance in Metallic Alloys: The Role of Isotropic Versus Kinematic Hardening.
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This video gives a basic overview of the most fundamental hardening models of plasticity, which are the isotropic and kinematic hardening
Hope this helps!
- Prithivi
Title of the project: Ab initio modelling of interactions between dislocations and solutes in body-centered cubic metals
Research area: Solid State Physics, Materials Science
Summary of the project:
G'day all
Having a metal element with a notch like crack (assume sharp one, exhibits plasticity), what are the actual fracture mechanism (the phases the crack goes through) in the total fatigue-life.
please comment on these scenarios:
1- crack initiation life calculated from the (S-N, e-N), then using LEFM/EPFM to determine the cycles for the crack propagation to failure...
Q/ how to find the crack length between the two phases, I mean from which stresses and at which crack length we start the crack propagation life estimation.
