# Plasticity

## Postdoctoral Position in Mesoscale Plasticity

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## Fatigue crack propagation

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Hi, I'm trying to perform a supposedly-simple experiment on fatigue crack propagation of UHMWPE. I use a compact-tension specimen on a servopulser hidraulic testing machine. I will try to do the experiment on a fix Pmax with a varied force ratio (R) from 0.1 to 0.5. I'm having trouble in deciding the maximum force Pmax. How does one decide the amount of force applied for FCP testing? Calculation steps and so on.

## Plasticity model in Abaqus to capture the continues plastic strain of granular material under triaxial cyclic loading?

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I am working on modelling ballast aggregates under triaxial loading. Confining pressure applied in the intermediate and minor principal direction and cyclic compression load applied in the major principal axis direction. I wanted to capture the continues plastic strain (PS) with cycles (N). My test results show that the PS increase with N up to about 10,000 cycles and the rate of strain slowly diminish for later cycles and almost stay constant after N=100,000. What available model in Abaqus can be used to get this behaviour. I have to run my analysis at least for 10,000 cycles.

## Multi-scale modeling of plastic deformations in nano-scale materials; Transition to plastic limit

Despite the controversial debates concerning a unified theory, the continuum plasticity has evolved during the last few decades and an uncountable number of articles has been published on the subject. The proposal of Lee to decompose the deformation gradient, F, into elastic part Fe and plastic part Fp (i.e. F=FeFp) combined with the principle of maximum plastic dissipation is used in many publications to formulate the ensuing developments.

## Polycrystal plasticity in Abaqus/Explicit

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Hello everyone!

My goal is to model large plastic deformations of polycrystalline metals using crystal plasticity and ALE adaptive meshing. In order to do that I want to use VUMAT subroutine in Abaqus/Explicit, since as far as I understand Abaqus/Standard is not good for large deformations and it doesn't support ALE adaptive meshing for that purpose.

## Please suggest self study book for continuum plasticity theory

Hello, I am new to theory of plasicity and need to learn it by myself. Please suggest a good book for self study for continuum plasticity theory. I am specially interested in metal plasticity theories, in analytical and numerical aspects.

## Implementation of JH-2(Johnson holmquist) constitutive equation in explicit FEM

Dear professionals,

I'm self-developing explicit 3-D hybrid FEM/DEM code using GPGPU for my research regarding Penetration of projectile into rock.

In the code, I'm incorporating JH-2(Johnson holmquist) constitutive model.

Although this constitutive mode has been implemented in LS-DYNA and Abacus Explicit, some implementation detail has not been geven in exsisting literature. I mean, I reviewed several literature but I only found a flowchart of implementation of JH2 from Table 1 in

## Potential surface and yield surface

Hello,

Would you please tell me the basic difference between potential plastic surface and yield surface with a physical meaning, if possible. I know that if both the surfaces match, then it is associated flow-rule, otherwise it is a non-associative flow rule.

I know that this is a very basic question, but I am facing difficulty in completely understanding it.

-Shivani

## Post-doctoral Position in Theoretical and Computational Solid Mechanics at Los Alamos National Laboratory

The Fluid Dynamics and Solid Mechanics Group (T-3) at Los Alamos National Laboratory is currently seeking outstanding candidates for a post-doctoral research position in the areas of solid mechanics, constitutive modeling, computational methods, and multi-scale modeling and simulation techniques. The prospective candidate is expected to take part in theory and computational method development for the effective representation of plasticity, damage and failure in solid materials.

## Looking for MS-PhD in Multiscale Mechanics of Metallic Materials

Dear All,   I have done B.Sc in "Metallurgical & Materials Engineering" from Institute of Advanced Materials, BZU Multan, Pakistan.