User login

Navigation

You are here

# Finite Element modeling

Pai Wang's picture

Fully funded positions at ALL levels - computational research

We are looking for candidates to join the Utah Waves and Architected Materials Group (w.mech.utah.edu). We have fully funded openings at all levels, including, undergrads, MS, PhD, and postdocs. Both full-time and part-time researchers are needed.

Emilio Martínez Pañeda's picture

Phase field fracture modelling using quasi-Newton methods and a new adaptive step scheme

Dear iMechanicians,

I hope this paper is of interest to you. We show that quasi-Newton methods make monolithic phase field fracture implementations very robust. Convergence and computations times orders of magnitude smaller than the usual staggered approaches are demonstrated in complex problems such as unstable cracking, fatigue or dynamic crack branching.

Kmomeni's picture

PhD Position in Multiscale Modeling of Materials

An immediate Ph.D. position is available in the Advanced Hierarchical Materials by Design Lab at Louisiana Tech University on multiscale modeling of materials synthesis. The candidates must have earned a degree in Mechanical Engineering, Chemical Engineering, or related fields (applicants with an MSc will be given priority) and have a solid background in theoretical and computational mechanics. Having knowledge of continuum mechanics, finite element modeling, and a programming language is a plus. 

 

Parag Tandaiya's picture

On the mechanism and the length scales involved in the ductile fracture of a bulk metallic glass

A few years ago we published a paper in Acta Materialia elucidating the mechanism and length scales in the ductile fracture of bulk metallic glass through experiments and finite element simulations.

The link to the paper is here: 'On the mechanism and the length scales involved in the ductile fracture of a bulk metallic glass'.

I hope you enjoy reading the paper and find it useful in your research.

Parag Tandaiya's picture

Fracture of notched ductile bulk metallic glass bars subjected to tension-torsion: experiments and simulations

There is a shortage of literature on mode III fracture behaviour of bulk metallic glasses.

In our following research paper published in Acta Materialia, we report our experiments and three-dimensional elasto-plastic finite element simulations of tension-torsion loading on notched ductile bulk metallic glass bars.

It is found that fracture toughness of this BMG is lowest in mode II among all three fracture modes.

Parag Tandaiya's picture

Mechanisms of compressive deformation and failure of porous bulk metallic glasses

Porous Bulk Metallic Glasses have been invented by researchers to mitigate catastrophic failure in monolithic Bulk Metallic Glasses which are susceptible to intense strain localization into shear bands.

emadmoeen1's picture

Industrial UCL PhD Studentship in the Design of Novel Microfluidic Devices

PhD Studentship

Department of Mechanical Engineering

University College London

UCL-EPSRC DTP-CASE PhD Studentship expression of interest

Computational and experimental design of new microfluidic devices for isolating circulating tumour cells

Winners & Finalists of the 31th Edition of the Annual Robert J. Melosh Competition at Duke University

The winner of the 2019 Robert J. Melosh Medal is Dewen Yushu (University of Notre Dame), who presented the paper "The data-driven multiscale multigrid solver, preconditioner and reduced-order model."

Congratulations also to the other finalists! They are listed below, with their respective papers:

Siddhant Kumar, California Institute of Technology and ETH Zurich "Enhanced local maximum-entropy approximation for stable meshfree simulations;"

sp435's picture

High strain rate liver tissue compression

Check out our latest publication on porcine liver biomechanics under high strain rate conditions -

"Mechanical Response of Porcine Liver Tissue under High Strain Rate Compression", Bioengineering, 2019, 6(2), 49; https://doi.org/10.3390/bioengineering6020049

https://www.mdpi.com/2306-5354/6/2/49

Emilio Martínez Pañeda's picture

Phase field modelling of crack propagation in functionally graded materials

Dear imechanicians

I hope that this paper is of interest to you. The phase field fracture code developed in FEniCS is available at www.empaneda.com/codes

Phase field modelling of crack propagation in functionally graded materials

Hirshikesh, S. Natarajana, R.K. Annabattula, E. Martínez-Pañeda

Composites Part B: Engineering 169, pp 239-248 (2019)

When to use equation of state models in modeling high velocity impacts?

Equation of state models (Mie-Gruneisen equation of state etc) have been widely used to study hydrodynamic response of material during explosive deformation, ballistic impacts for a long time. As far as I understand, a hydrodynamic response is required to be incorporated in a model if the pressure of impact leads to an increase volumetric strength. That is the stress wave speed in the material exceeds the speed of sound in the material (v = sqrt(elastic modulus/density)).  Ballistic impacts occur at strain rates close to 10^9 to 10^12/s.

yann.charles's picture

PhD position / La Rochelle - France

A PhD position is available at LaSie (La Rochelle University, France), until oct. 2019.

The work will be dedicated to the caracterisation (numercial and experimental) of the effect of grains boundary on the Hydrogen diffusion in Nickel polycrystals.

Please send your resume and application letter to:

J. Bouhattate (Jamaa.bouhattate@univ-lr.fr)

Postdoctoral Scholar Position in Computational and Experimental Biomechanics at East Carolina University

The Postdoctoral Scholar is responsible for independent and collaborative development, implementation, and analysis of scientific research in the discipline of computational and experimental biomechanics. Responsibilities include management of all aspects of research related to biomechanical characterization and computer modeling of biological tissue and implants in Vahdati Lab. The research projects include investigation of mechanopathologies of soft and calcified tissue and design of personalized medical devices.

MMSLab-CNR's picture

Modal analysis performed by NOSA-ITACA code

The following picture shows a screenshot of the NOSA-ITACA desktop enviroment during a modal analysis. In particular the first and the third mode shape of the San Frediano bell Tower in Lucca (Italy) are shown. The structure is discretized into 45641 eight-node brick elements (element no. 8, NOSA-ITACA element library) with 136923 degrees of freedom. For more details sees: R.M. Azzara, G. De Roeck, E. Reynders, M. Girardi, C. Padovani and D.

A PhD position at the University of Western Ontario, Canada

We are looking for a talented, self-motivated, and enthusiastic student with a BSc or MSc degree in mechanical or materials engineering. Students with strong background in crystal plasticity and computational mechanics are recommended to apply.

 

Prospective candidates will be assessed based on how well they meet the following criteria:

Solving incompressible finite elasticity without tears

Solving incompressible elasticity has been quite challenging numerically. The conventional approach for handling incompressibility is the so-called penalty method. A volumetric energy term enters into the strain energy and penalizes the volumetric deformation. One straightforward issue is that the penalty parameter goes directly into the tangent matrix. The bigger the penalty parameter, the worse the condition number of the matrix. This is really a manifestation of the ill-posedness of theories based on the Helmholtz free energy, in my opinion [3].

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. 

Pages

Subscribe to RSS - # Finite Element modeling

Recent comments

More comments

Syndicate

Subscribe to Syndicate