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# Finite Element modeling

Emilio Martínez Pañeda's picture

Steady-state fracture toughness of elastic-plastic solids: Isotropic versus kinematic hardening

I hope some of you may find this work interesting. We show that kinematic hardening effects play a significant role in monotonic/static fracture.

Steady-state fracture toughness of elastic-plastic solids: Isotropic versus kinematic hardening

K.J.Juul, E.Martínez-Pañeda, K.L.Nielsen, C.F.Niordson

Engineering Fracture Mechanics, 207, pp. 254-268 (2019)

Volume 207, 15 February 2019, Pages 254-268

Kmomeni's picture

PhD position in Multiscale Modeling Materials Under extreme conditions

An immediate fully-funded Ph.D. position is open in Advanced Hierarchical Materials by Design Lab at Louisiana Tech University on multiscale modeling of materials under extreme conditions. The project involves collaboration with the computational research groups at national labs, as well as experimental researchers from MIT and Georgia Tech to test and validate the models and codes.

Emilio Martínez Pañeda's picture

A phase field formulation for hydrogen assisted cracking [code included]

I hope some of you may find this work interesting, the finite element code developed (Abaqus UEL subroutine) can be downloaded from www.empaneda.com/codes

 

A phase field formulation for hydrogen assisted cracking

 

Emilio Martínez-Pañeda, Alireza Golahmar, Christian F. Niordson

 

Computer Methods in Applied Mechanics and Engineering, 342, pp. 742-761 (2018)

 

Emilio Martínez Pañeda's picture

Size effects in elastic-plastic functionally graded materials

I hope some of you may find this work interesting:

Size effects in elastic-plastic functionally graded materials

Tittu V. Mathew, Sundararajan Natarajan, Emilio Martínez-Pañeda

Composite Structures, 204, pp. 43-51 (2018)

https://www.sciencedirect.com/science/article/pii/S0263822318313928

A post-print is available at www.empaneda.com

Early Stage Researcher position, Biomedical simulations, Cardiff University

Cardiff University invites applications for an Early Stage Researcher position (Doctoral Candidate) as part of the Rapid Biomechanics and Simulation for Personalised Clinical Design (RAINBOW) MCSA European Training Network. RAINBOW is funded under the European Union’s Horizon 2020 research and innovation programme. The post holder will undertake research on “Meta Modelling for Soft Tissue Contact and Cutting Simulation” leading to a PhD degree award. The post holder will develop numerical methods to simulate the deformations of soft-tissues in the context of computer-aided surgery.

Emilio Martínez Pañeda's picture

Crack Growth Resistance in Metallic Alloys: The Role of Isotropic Versus Kinematic Hardening

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. 

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

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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.

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