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# Finite Element modeling

GTN model

I have 2 questions regarding GTN model.

1) What does q1, q2, q3 signify in GTN damage model? What are their physical meanings. I know only their numerical values.
2) How to deal with the problem of GTN in Compression? It is working fine with tension but while in compression it is unable to converge.

yann.charles's picture

2 years PostDoctoral Position - Universities Lille & Paris 13 , Paris, France

A 2 years post Doctoral position is avalaible in France, on material science numerical modeling fields. This is a join project between Univ. Lille (UMET lab), Paris 13 (LSPM lab), CEA (IRFM lab) and Marseille univ. (PIIM lab).

The present postdoc subject is focused on the modeling of the interactions between impurities (H, He...) and tungsten. 

Emilio Martínez Pañeda's picture

Non-local plasticity effects on notch fracture mechanics (code included)

I hope some of you find this work interesting, the code with the control algorithm (Segurado and Llorca, 2004) to avoid convergence problems in cohesive zone model analyses of crack propagation can be downloaded from empaneda.com/codes (documentation and Abaqus input files are provided).

Non-local plasticity effects on notch fracture mechanics

Emilio Martínez-Pañeda, Susana del Busto, Covadonga Betegón 

Theoretical and Applied Fracture Mechanics (2017)

claudiosaul.lopes's picture

PhD position: multiscale computational mechanics of advanced composites

The Composites Materials Group (http://www.materials.imdea.org/groups/cm/) at IMDEA Materials, led by Dr. Carlos González and Dr. Cláudio S. Lopes, invites applications for a PhD student position in the field of multiscale computational mechanics of advanced composites. Candidates with interest and knowledge on computational damage mechanics, model development, numerical simulation and optimization methods for advanced composite materials and structures are strongly encouraged to apply.

PhD positions in the area of materials modelling and characterization: Western University, Canada

PhD positions are available:

I am looking for talented, self-motivated, and enthusiastic students with MSc degree in mechanical or materials engineering. Students with a background in any of the following areas are recommended to apply:

Flavio Stochino's picture

A simplified model for railway catenary wire dynamics

In this paper, a simplified analytic model for the dynamic behaviour of railway catenary wire is presented. The model is discussed and validated with the help of numerical results obtained by a finite element code, for the case of a typical Italian railway installation. The simplified model is convenient from the computational point of view and is useful for sensitivity analysis. Some parametric studies have been developed by considering as free parameters the velocity and the distance of the train pantographs and looking at their effect on catenary dynamics.

Noel ODowd's picture

Fellowships (3 year) available in computational mechanics of composite materials

Expressions of interest are invited for applicants interested in applying for a 3 year post-doctoral fellowship in the area of computational mechanics of composite materials.

rajan_prithivi's picture

Local mesh refinement using Gmsh

Hello All,

I am using Gmsh for creating a finite element mesh. After I create the volume mesh, Is there a way to do a local mesh refinement around a particular point (say x,y,z) and within a sphere of given radius.

Kindly help !

 

-Prithivi

Michael A. McCarthy's picture

Marie Curie Early Stage Researcher (PhD student), Improving the crashworthiness of composite transportation structures

Applications are invited for a PhD position at the University of Limerick, Ireland, funded through the EU Marie Curie Early Stage Researcher Programme.

SALARY: €37,903 p.a. (plus family allowance of €4,589 p.a. where appropriate in accordance with Marie Skłodowska-Curie programme rules).

Topic: Development of discrete fastener-less joining technologies for impact protection devices

PhD position in multi-scale modelling of materials- Queen’s and Western University, Canada

A PhD position is available in the area of mechanics of materials. Applicants with a strong background in finite element modelling, crystal plasticity finite element, and materials characterization are recommended to apply.

How to use non-dimensional form in open source codes instead of Units

Choose a channel featured in the header of iMechanica: 

I am using an open source FEM platform, which requires you to convert your equation system to non-dimensional form. So, there are no units specified for the parameters in the problem. If you use compatible input units, you should expect the output in matching unit - just like one would do in a normal python or C++ code for solving physical problems. I have an elasto-plastic dynamic problem to solve, and these are the parameters for the Drucker-Prager Soil Model for soft clay.

E = 5000000;                 // Young's Modulus in N/m^2 or Pa

How to use non-dimensional form in open source codes instead of Units

I am using an open source FEM platform, which requires you to convert your equation system to non-dimensional form. So, there are no units specified for the parameters in the problem. If you use compatible input units, you should expect the output in matching unit - just like one would do in a normal python or C++ code for solving physical problems. I have an elasto-plastic dynamic problem to solve, and these are the parameters for the Drucker-Prager Soil Model for soft clay.

E = 5000000;                 // Young's Modulus in N/m^2 or Pa

Cant solve "too many attempts made for this increment"-issue on some models

Choose a channel featured in the header of iMechanica: 

Hello at all,

 

I have some serious issues with some of my models in Abaqus 6.14. I need to simulate shear failure to investigate the influence of concrete strength and fracture energy on the size effect. So far, everything went good. I calculated almost 100 models without any problem with exactly the same model (only materials changed). But: For the combination of concrete strength fck=50MPa and a fracture energy of Gf=60N/m or Gf=80N/m, the calculations will stop after a short time although the .odb file shows only some minor bending cracks in the beam

Looking for a PhD position in Bio/Biomedical Engineering

Hello

I am actively looking for a PhD in Bio/Biomedical engineering. I am interested in multidisciplinary applied research, and would prefer to work in a research group of multiple expertise.

Opening for a Sr Computational Modeling Engineer at Medtronic !

This exciting position is posted today.  We are looking for someone who has strong theoretical background in material constitutive modeling and has the ability to do user material coding and simulation automation through python/R/Matlab scripting.  Experience with shape-memory alloys is desired.  Below is the link:

 https://medtronic.taleo.net/careersection/2/jobdetail.ftl?job=160000ZQ&lang=en

 

LS DYNA ADDING A BEAM

How do i add a reinforcement beam to a door of a car at the front using the ls dyna contact card CONSTRAINED_RIGID_BODY ?

LS DYNA ADDING A BEAM

How do i add a reinforcement beam to a door of a car at the front using the ls dyna contact card CONSTRAINED_RIGID_BODY ?

Job position in numerical biomechanics

DECATHLON is a French company which designs and sells sports goods. With about 900 shops all around the world, DECATHLON has more than 60000 employees, all passionate about sports, and generates a 7 billion euros turnover.

 

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