User login

Navigation

You are here

Emilio Martínez Pañeda's blog

Emilio Martínez Pañeda's picture

Cracking predictions of lithium-ion battery electrodes by X-ray computed tomography and modelling


Dear iMechanicians,

I hope that the following work is of interest. We conduct the first multi-physics fracture simulation of Li-Ion battery electrodes. Phase field was combined with advanced X-ray CT imaging to predict degradation of realistic microstructures. 

Emilio Martínez Pañeda's picture

Postdoc position at Imperial College London on hydrogen assisted fracture

The Mechanics of Infrastructure Materials research group are looking to hire a Postdoctoral Research Associate (PDRA) to work in the prediction of hydrogen embrittlement using computational methods. The Research Associate will work under the supervision of Dr Emilio Martínez-Pañeda and the project is supported by TENARIS. 

 

Emilio Martínez Pañeda's picture

Phase field fracture predictions of microscopic bridging behaviour of composite materials

Dear iMechanicians,

I hope that you find the following paper of interest. We conducted 3D (phase field) fracture simulations that explicitly resolve the microstructure of composites, predicting the role of key mechanisms such as fibre bridging (i.e., an output of the model, not an input!). 

Emilio Martínez Pañeda's picture

Postdoc position at Imperial College London on predicting hydrogen embrittlement

The Mechanics of Infrastructure Materials research group are looking to hire a Postdoctoral Research Associate (PDRA) to work in the prediction of hydrogen-assisted failures using computational methods. The Research Associate will work under the supervision of Dr Emilio Martínez-Pañeda and the project is supported by the Electric Power Research Institute (EPRI).

Emilio Martínez Pañeda's picture

Postdoc on hydrogen embrittlement and corrosion at Imperial College London: experimental

The Mechanics of Infrastructure Materials research group are looking to hire a Postdoctoral Research Associate (PDRA) to work in the UKRI Future Leaders Fellowship grant NEWPHASE. The project, led by Dr Emilio Martínez-Pañeda, aims at tackling pressing material degradation challenges at the interface between mechanics and chemistry. 

Emilio Martínez Pañeda's picture

A phase field model for hydrogen-assisted fatigue

Dear iMechanicians. I hope that you find the below work interesting - we have developed the first phase field formulation for hydrogen assisted fatigue. Fatigue crack nucleation and growth is predicted for arbitrary geometries, loading histories, and H contents. Virtual S–N curves are also obtained. You can check it here: https://doi.org/10.1016/j.ijfatigue.2021.106521

Emilio Martínez Pañeda's picture

Postdoc position at Imperial College London on phase field modelling of corrosion

The Mechanics of Infrastructure Materials research group are looking to hire a Postdoctoral Research Associate (PDRA) to work in the development of new phase field-based models for predicting localised corrosion (pitting and stress corrosion cracking). The work is part of a wider project, led by Dr Emilio Martínez-Pañeda, that builds upon our recent JMPS work (https://doi.org/10.1016/j.jmps.2020.104254).

Emilio Martínez Pañeda's picture

An assessment of phase field fracture: crack initiation and growth

Dear iMechanicians,

We have contributed to the Special Issue organised by the Royal Society on occasion of the centenary of Griffith's seminal paper with a paper revisiting phase field fracture methods and their connection with conventional fracture mechanics theory. I hope that you find it of interest. (https://royalsocietypublishing.org/doi/10.1098/rsta.2021.0021)

Image

Emilio Martínez Pañeda's picture

Postdoc position at Imperial College London on multi-physics modelling

The Mechanics of Infrastructure Materials research group are looking to hire a Postdoctoral Research Associate (PDRA) to work in the EPSRC project NEXTGEM. The project, led by Dr Emilio Martínez-Pañeda, aims at combining phase field methods and electro-chemo-mechanics modelling to resolve the scientific challenges holding back the applicability of hydrogen embrittlement models.

Emilio Martínez Pañeda's picture

Phase field predictions of microscopic fracture and R-curve behaviour of fibre-reinforced composites

Dear iMechanicians,

I hope that the following work is of interest to you. We combine the phase field method with cohesive zone modelling to predict the fracture behaviour of fibre-reinforced composites across scales.

Emilio Martínez Pañeda's picture

A phase field formulation for dissolution-driven stress corrosion cracking

Dear iMechanicians, I hope that our latest JMPS paper is of interest to you. We show how the phase field paradigm can be extended to model localised corrosion (aqueous electrolyte-solid interface) and the associated damage mechanisms. 

C. Cui, R. Ma, E. Martínez-Pañeda. A phase field formulation for dissolution-driven stress corrosion cracking. Journal of the Mechanics and Physics of Solids 147, 104254 (2021)

https://www.sciencedirect.com/science/article/pii/S0022509620304622

Emilio Martínez Pañeda's picture

Postdoc position at Imperial College London on hydrogen embrittlement testing

The Mechanics of Infrastructure Materials research group are looking to hire a Postdoctoral Research Associate (PDRA) to work in the EPSRC New Horizons project NanoHMAT. The project, led by Dr Emilio Martínez-Pañeda, aims at exploring high-risk high-gain approaches for developing a new generation of hydrogen embrittlement-resistant materials.

Emilio Martínez Pañeda's picture

Phase field modelling of fracture and fatigue in Shape Memory Alloys

Dear iMechanicians. I hope that the following paper is of interest to you. We develop the first phase field formulation for fracture (and fatigue) in Shape Memory Alloys. Its potential is demonstrated by solving a variety of paradigmatic 2D and 3D boundary value problems, from R-curves to fatigue cracking of a NiTi biomedical stent.

M. Simoes, E. Martínez-Pañeda. Phase field modelling of fracture and fatigue in Shape Memory Alloys. Computer Methods in Applied Mechanics and Engineering 373 (2021) 113504

Emilio Martínez Pañeda's picture

Analysis of the influence of microstructural traps on hydrogen assisted fatigue

Dear iMechanicians,

I hope some of you find of interest our latest Acta Mat. paper. We show that the concept of "beneficial traps" can enlarge by an order of magnitude the range of "safe loading frequencies" at which hydrogen embrittlement is not observed. 

Analysis of the influence of microstructural traps on hydrogen assisted fatigue

Rebeca Fernández-Sousa, Covadonga Betegón, Emilio Martínez-Pañeda

Acta Materialia 199, 253-265 (2020). Link

Emilio Martínez Pañeda's picture

Fracture in distortion gradient plasticity

Dear iMechanicians,

I hope that the following paper is of interest to you. We use for the first time Gurtin (2004) gradient plasticity theory to investigate crack tip mechanics, revealing the existence of an elastic core adjacent to the crack tip, resembling a dislocation-free zone. Also, we show that the combination of strain gradient hardening and dislocation blockage can rationalise brittle fracture in elastic-plastic material interfaces.

Emilio Martínez Pañeda's picture

A phase field model for elastic-gradient-plastic solids undergoing hydrogen embrittlement

Dear iMechanicians,

I hope some of you find our recent JMPS paper interesting. We combine phase field fracture, hydrogen transport and strain gradient plasticity to provide a modern rationale to the mechanism of hydrogen enhanced decohesion. 

A phase field model for elastic-gradient-plastic solids undergoing hydrogen embrittlement

Philip K. Kristensen, Christian F. Niordson, Emilio Martínez-Pañeda

Journal of the Mechanics and Physics of Solids, 143, 104093 (2020)

Emilio Martínez Pañeda's picture

Generalised boundary conditions for hydrogen transport at crack tips

Dear iMechanicians,

I hope the present work is of interest to you. We present a new formulation for resolving the electrochemical-diffusion interface in hydrogen embrittlement modelling 

E. Martínez-Pañeda, A. Díaz, L. Wright, A. Turnbull

Generalised boundary conditions for hydrogen transport at crack tips

Corrosion Science 173, 108698 (2020)

https://www.sciencedirect.com/science/article/pii/S0010938X20305345

Emilio Martínez Pañeda's picture

Analysis of hydrogen permeation tests considering two different modelling approaches for grain boundary trapping in iron

Dear iMechanicians,

I hope the present work on two-scale modelling of hydrogen permeation is of interest to you. A post-print is available at www.empaneda.com

A. Díaz, I. I. Cuesta, E. Martinez-Pañeda, J. M. Alegre
Analysis of hydrogen permeation tests considering two different modelling approaches for grain boundary trapping in iron
International Journal of Fracture 223, 17-35 (2020)

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.

Emilio Martínez Pañeda's picture

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

I hope that some of you will find this work interesting. We show that early cracking occurs in slow strain rate tensile testing (SSRT), which compromises the capabilities of this popular experiment for measuring hydrogen embrittlement susceptibility.

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

E. Martínez-Pañeda, Z. D. Harris, S. Fuentes-Alonso, J. R. Scully, J. T. Burns

Corrosion Science 163, 108291 (2020)

Emilio Martínez Pañeda's picture

2 Research Assistant/Associate positions in CFD modelling of dust explosions (2 years)

Applications are invited for two Research Assistant (PhD candidates) or Research Associates (post-docs) positions at the University of Oviedo, in close collaboration with Imperial College London. Research Assistants will be appointed for 2 years while Research Associates will be appointed initially for one year, with the possibility of extending one more year. Conditional upon satisfactory progress, the researchers will have the opportunity to divide their time between the University of Oviedo and Imperial College upon their convenience.

Emilio Martínez Pañeda's picture

Mode II fracture of an elastic-plastic sandwich layer

Dear iMechanicians,

Please find below a paper, co-authored with Ivan Cuesta and Norman Fleck, on the mode II fracture of elastic-plastic sandwich layers. The paper is part of the special issue in the Journal of Applied Mechanics dedicated to John Hutchinson's 80th anniversary and the Century Fracture Mechanics Summit.

Emilio Martínez Pañeda's picture

PhD position in Computational Fracture Mechanics of porous media at Imperial College London (UK applicants only)

Applications are invited for a PhD scholarship at Imperial College London. The work will be conducted in close collaboration with the University of Cambridge, with the student being supervised by Dr ​​​​Emilio Martínez Pañeda (main supervisor), Prof Catherine O'Sullivan (Imperial College) and Prof Norman Fleck FRS FREng (University of Cambridge). 

The project aims at developing new theoretical and computational micromechanics-based models for rocks and porous media. More details of the project are given here:

Pages

Subscribe to RSS - Emilio Martínez Pañeda's blog

Recent comments

More comments

Syndicate

Subscribe to Syndicate