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Emilio Martínez Pañeda's blog

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PhD position in Computational Mechanics for porous media at the University of Oviedo, Spain

Applications are invited for a PhD scholarship at the University of Oviedo (Spain). The work will be conducted in close collaboration with Imperial College London. The PhD studentship is part of the MICROROCK project, which aims at developing a new generation of micromechanics-based models for predicting rock fracture. A competitive salary is offered and the position is open to international candidates. Further details are provided below and in the attached PDF.

PhD post in Computational Mechanics for porous media at the University of Oviedo, Spain

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PhD position in Computational Fracture Mechanics at Imperial College London

 Applications are invited for a PhD scholarship at Imperial College London. The project will involve the development of novel computational tools to unravel fracture mechanics challenges across disciplines. The student will join the Mechanics of Infrastructure Materials Lab, led by Dr Emilio Martínez-Pañeda.

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Gradient-enhanced statistical analysis of cleavage fracture

I hope some of you will find this work interesting. We present a new Weibull framework for cleavage fracture that incorporates strain gradient plasticity and can estimate the three parameters of Weibull-type models without any prior assumptions. A post-print is available at www.empaneda.com

Gradient-enhanced statistical analysis of cleavage fracture

Emilio Martínez-Pañeda, Sandra Fuentes-Alonso, CovadongaBetegón

European Journal of Mechanics - A/Solids 77, 103785 (2019)

 

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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)

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Mode I crack tip fields: strain gradient plasticity theory versus J2 flow theory

I hope some of you may find this work interesting. We show, analytically and numerically, that strain gradient plasticity predicts the existence of an inner elastic field adjacent to the crack tip, reminiscent of a dislocation-free zone. The fact that elastic strains dominate plastic strains near the crack tip implies a paradigm-shift with respect to previous crack tip asymptotic studies in plasticity and gradient plasticity, which neglect elastic strains. 

 

Emilio Martínez-Pañeda, Norman A. Fleck

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The role of plastic strain gradients in the crack growth resistance of metals [code included]

I hope some of you will find our recent paper in the Journal of the Mechanics and Physics of Solids interesting. The Abaqus user element (UEL) subroutine developed to implement strain gradient plasticity theories with energetic and dissipative higher order stresses (Gudmundson 2004, Fleck and Willis 2009) can be downloaded from www.empaneda.com/codes

The role of plastic strain gradients in the crack growth resistance of metals

Emilio Martínez-Pañeda, Vikram S. Deshpande, Christian F. Niordson, Norman A. Fleck

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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

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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)

 

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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

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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. 

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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)

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New release of Abaqus2Matlab: GUI, reading .odb and much more!

A2M GUI interface 

Dear imechanicians,

A new version of Abaqus2Matlab has just been released and I hope that it is of interest to you.

This new release constitutes a very significant step forward in the development of this well-known software to connect Abaqus and Matlab.

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A cohesive zone framework for environmentally assisted fatigue (code included)

I hope some of you find this work interesting, the code with the cohesive zone model for fatigue can be downloaded as a user element (UEL) subroutine for Abaqus from empaneda.com/codes

A cohesive zone framework for environmentally assisted fatigue

Susana del Busto, Covadonga Betegón, Emilio Martínez Pañeda

Engineering Fracture Mechanics (2017)

http://www.sciencedirect.com/science/article/pii/S001379441730098X

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Gradient plasticity crack tip characterization by means of the extended finite element method (MATLAB code included)

I hope some of you may find this work interesting, the X-FEM non-linear code developed (incorporating linear elasticity, J2 plasticity, and Strain Gradient Plasticity) can be downloaded from www.empaneda.com/codes

Gradient plasticity crack tip characterization by means of the extended finite element method

Emilio Martínez-Pañeda, Sundararajan Natarajan, Stéphane Bordas

Computational Mechanics (2017)

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Abaqus2Matlab: A suitable tool for finite element post-processing

A new piece of software has been presented that connects the well-known FE code Abaqus with Matlab. The source code, detailed documentation and a large number of tutorials can be freely downloaded from www.abaqus2matlab.com 

Some interesting applications are addressed in the associated journal article:

http://www.sciencedirect.com/science/article/pii/S0965997816306512 (a pre-print is available at www.empaneda.com)

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Damage modeling in Small Punch Test specimens

I hope some of you may find this work interesting:

Damage modeling in Small Punch Test specimens

E. Martínez-Pañeda, I.I. Cuesta, I. Peñuelas, A. Díaz, J.M. Alegre

Theoretical and Applied Fracture Mechanics, 86A, pp. 51-60

http://www.sciencedirect.com/science/article/pii/S0167844216301616

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

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Strain gradient plasticity-based modeling of hydrogen environment assisted cracking

I hope some of you may find this work interesting:

Strain gradient plasticity-based modeling of hydrogen environment assisted cracking

Emilio Martínez-Pañeda, Christian F. Niordson, Richard P. Gangloff

Acta Materialia, 117, pp. 321-332

http://www.sciencedirect.com/science/article/pii/S1359645416305183

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

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A finite element framework for distortion gradient plasticity with applications to bending of thin foils

A finite element framework for distortion gradient plasticity with applications to bending of thin foils

Emilio Martínez-Pañeda, Christian F. Niordson, Lorenzo Bardella

International Journal of Solids and Structures

http://www.sciencedirect.com/science/article/pii/S0020768316301081

(A pre-print version is available at www.empaneda.com)

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XVIII ICMFM - Deadline for abstract submission extended and journal publication

Dear Colleagues

 

We kindly inform you that the Abstract Submission Deadline of the XVIII International Colloquium on Mechanical Fatigue of Metals (XVIII ICMFM) to be held in Gijón, Spain, has been extended until the 20th of February of 2016. Moreover, the registration is already open.

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Fracture toughness characterization through notched small punch test specimens

I hope some of you may find this work interesting.

Fracture toughness characterization through notched small punch test specimens

http://www.sciencedirect.com/science/article/pii/S0921509316300740

(A preprint version is available at www.empaneda.com)

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XVIII International Colloquium on Mechanical Fatigue of Metals (ICMFM XVIII) - Abstract submission open

Dear Colleagues,


It is a great pleasure to contact you again to give you some new details about the XVIII International Colloquium on Mechanical Properties of Metals (ICMFM18), to be held in Gijón (Spain), from September 5th to 7th of 2016.

 

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On fracture in finite strain gradient plasticity

I hope some of you - particularly those working on strain gradient plasticity or damage and fracture modeling - find this work interesting. 

On fracture in finite strain gradient plasticity

http://www.sciencedirect.com/science/article/pii/S074964191500162X

(A pre-print version is available at www.empaneda.com)

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XVIII International Colloquium on Mechanical Fatigue of Metals (ICMFM XVIII) - First announcement

Dear Colleagues,

It is our great pleasure to announce the XVIII International Colloquium on Mechanical Fatigue of Metals (ICMFM XVIII), which will take place at the Universidad Laboral in Gijón (Spain), the 5th, 6th and 7th of September of 2016. The event will be organized by the Engineering School of the University of Oviedo.

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