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Crystal plasticity

VUMAT implementation of crystal plasticity

I am new to crystal plasticity simulations and have been studying the concepts from "Introduction to Crystal Plasticity" in Mechanics of Microstructured Materials book. Additionally, I have been going through the publicly available UMAT for crystal plasticity (Huang 1991). I have also come across a paper titled "Comparison of the implicit and explicit finite element methods using crystal plasticity (2007)," where the authors have implemented the model in Abaqus/Explicit environment.

Input file for the Single crystal plasticity subroutine Nonlinear Finite Elements for Continua and Structures by Ted Belytschko

Can anyone provide me with the input file for the example shown in the book Nonlinear Finite Elements for Continua and Structures by Ted Belytschko et al? The poly-slip, rate-dependent, single crystal plasticity VUMAT subroutine that is available publicly is attached in the following link. I have been trying to reproduce the results in Fig. 13.11 to Fig. 13.13. in the book, but am not successful in doing so. Can anyone please provide me with a working example input file for the problem?

https://gofile.io/d/xI9QSV

Input file for the CPFE VUMAT in Nonlinear finite elements for continua and structure

I am learning crystal plasticity and its implementation as VUMAT subroutine from the book Nonlinear finite elements for continua and structure. I am aiming to gain more insight about the implementation by studying the poly-slip, rate-dependent, single crystal plasticity subroutine provided in the solution manual.

However, I couldn't reproduce the example in the book successfully, as I believe I have made errors in defining the material properties in the Abaqus input file. So, can someone please provide the input file for the associated VUMAT subroutine?

How to include temperature effects on the shear rates in Dr. Huang's crystal plasticity code

I am using Dr. Huang's crystal plasticity code for an adiabatic process where temperature increase due to deformation need to be calculated. Dr. Huang's CP UMAT code does not consider the temperature effect of shear rate or hardening. Is there a way to include temperature effects in the current UMAT code?

http://www.columbia.edu/~jk2079/Kysar_Research_Laboratory/Single_Crystal...

Jason Mayeur's picture

Research Assistantship Positions Available in Multiscale Materials Modeling at the University of Alabama in Huntsville

Positions are available in Dr. Jason Mayeur's research group in the Department of Mechanical and Aerospace Engineering at the University of Alabama in Huntsville. Preferred candidates will have earned an MSc degree in Mechanical Engineering or a closely related field, and have a solid background in theoretical and computational mechanics. Ideal candidates will also have prior experience in finite element modeling and computer programming.

Applicants should directly contact Dr. Mayeur:
jason.mayeur at uah.edu    

Timothy Truster's picture

Two open PhD positions in multi-physics process and performance modeling of alloys at the University of Tennessee

We have two open PhD position starting in the Fall semester 2020 at the Computational Laboratory for the Mechanics of Interfaces at the University of Tennessee - Knoxville (http://clmi.utk.edu). First research topic centers upon the modeling of texture evolution during processing (e.g. cogging and rolling) of titanium alloys using crystal plasticity and Fast Fourier Transform methods to couple the mesoscale and specimen scale.

Open Position at A*STAR in Singapore: Research Scientist (IHPC)

The Institute of High Performance Computing, part of A*STAR in Singapore, is seeking a talented, motivated researcher to hire with extensive experience in computational mechanics:

WaiChing Sun's picture

Postdoc position available at Columbia University in the City of New York

We have one or more postdoc positions available, to be filled immediately, in my research group. We are looking for postdocs in the broad area of computational mechanics.  Candidates should have expertise in modeling dynamic responses of path-dependent materials. Our project is specifically focused on the development and validation of multiscale models for energetic/porous/polycrystalline materials across length scales. More details will be provided to interested candidates. 

rajan_prithivi's picture

Critical porosity in the fatigue of additively manufactured IN718 via crystal plasticity modeling

https://doi.org/10.1016/j.matdes.2018.04.022

Highlights

1. Critical porosity is estimated in additively manufactured IN718 via crystal plasticity.

2. Porosity is characterized using high resolution tomography.

3. Non-local damage indicator parameters identify the location of fatigue crack initiation.

Shailendra's picture

Void growth and coalescence in hexagonal close-packed (HCP) single crystals

I am pleased to share our recent paper on the growth and coalescence of voids in HCP single crystals (Balaji Selvarajou, Shailendra P. Joshi, Amine Benzerga). 

https://www.sciencedirect.com/science/article/pii/S0022509618307300 

Abstract

 

Timothy Truster's picture

Open PhD position in multi-scale process modeling of titanium alloys at the University of Tennessee

We have an open PhD position starting in the Fall semester 2019 at the Computational Laboratory for the Mechanics of Interfaces at the University of Tennessee - Knoxville (http://clmi.utk.edu). The research topic centers upon the modeling of texture evolution during processing conditions of titanium alloys using dislocation density based crystal plasticity. Efficient computational algorithms will be pursued to couple the specimen/part scale and the mesoscale.

jsegurado's picture

PhD position in Multiscale mechanical modeling of metals , IMDEA-Materials Institute

IMDEA Materials Institute is non-profit research organization located in Madrid, Spain, to carry out research activities in Materials Science and Engineering. More information can be found 

jsegurado's picture

PhD and Postdoct positions in Crystal Plasticity, IMDEA-Materials Institute

Searching for PhD (thesis) candidate and Postdoctoral research associate, to work in Multiscale Materials Modeling, with special emphasis in crystal plasticity modelling with the finite element method.

Effect of Loading on Slipping of Crystal Planes

We know when a metal is subjected to proper loading, there exists plastic strain. A great part of plastic strain is developed from the slipping of the crystal planes of that metal in microstructure level. Now, when the load is uniaxial, it is simple to calculate the amount of shear strain acts on that plane. But, when the load is not uniaxial, the life is harder. It is very hard to calculate which slip plane feels how much shear strain.

WaiChing Sun's picture

Postdoc Position on computational mechanics of polycrystaline rocks

Dear colleagues, 

A postdoc position is immediately available in my research group. Experience on derivation, implementation, validation and verification of crystal plasticity model at finite strain is required. Knowledge on meshless method and/or phase field modeling is a plus but not required. 

For further information, please visit our research group webpage listed below. 

http://poromechanics.weebly.com/

mesarovic's picture

deadline for financial aid for the CISM summer course on Mesoscale models

This is a reminder that the deadline to apply for the financial aid for the summer course in Udine is approaching:  March 22. 

 

Short course at Centre International de Sciences Mechanique (CISM), Udine.

May 22-26, 2017

Lecturers:  S Forest, I Groma, D McDowell, S Mesarovic, J-N Roux, H Zbib

The flyer is attached.  Register at:   http://www.cism.it/courses/C1703/ 

mesarovic's picture

Short course: Mesoscale models: From micro-physics to macro-interpretation

Short course at Centre International de Sciences Mechanique (CISM), Udine.

May 22-26, 2017

Lecturers:  S Forest, I Groma, D McDowell, S Mesarovic, J-N Roux, H Zbib

The flyer is attached.  Register at:   http://www.cism.it/courses/C1703/ 

Summary 

JRF position at IIT Ropar

Job title: JRF

Minimum qualification: MTech in Mechanical/ Applied Mechanics or Equivalent.

or

Graduate degree (B.Tech.) in Mechanical/ Applied Mechanics with a valid GATE score.

Research area: Crystal Platicity, FEM

Salary: Rs 25000 per month + 10% HRA

Timothy Truster's picture

Two PhD positions in computational mechanics of materials at the University of Tennessee

Two PhD positions are currently available in the Computational Laboratory for the Mechanics of Interfaces at the University of Tennessee - Knoxville (http://clmi.utk.edu). Research topics are in the following areas:

1. Modeling of titanium alloys using dislocation density based crystal plasticity finite element method.

S. Beretta's picture

Simulation of crack growth in Ni-based single crystals

In a cooperative research between PoliMi and UIUC we have analyzed the crack growth in Ni-based single crystals:

http://www.sciencedirect.com/science/article/pii/S0142112316000840

 Crack growth experiments analyzed with DIC had shown relatively low closure levels respect to polycrystals. Crystal plasticity simulations with WARP3D have been able to simulate closure levels consistent with the experimental ones.

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