phunguyen's blog

Dr. Alban de Vaucorbeil from Deakin University (Victoria, Australia) has a tax-free PhD Scholarship available from November 2023. Funding to conduct research and stipend is provided. The student will be located in Geelong, Australia, close to the city of Melbourne and the famous Bells Beach, Torquay.

Research Topic

Hello all,

In the spirit of Timoshenko's of one contributes what one can, I am sharing with young students my note on mathematics. 

The link is:

https://www.researchgate.net/publication/360324957_MINIMUM_MATHEMATICS_for_future_scientists_and_engineers_An_inspiring_self-study_note

To students and junior researchers,

Together with Stephane Bordas (Luxembourg University) and Alban de Vaucorbeil (Deakin University, Australia), we have assembled a PDF (https://imechanica.org/files/how-to-write-paper_29_Nov_2021.pdf) outlining our our approach to writing articles on the field of computational mechanics. Also discussed are softwares used. We hope that it will be of help to students and junior researchers.

The Journal Club for April 2021 presents a concise review of the so-called variational phase-field fracture theory for brittle and cohesive fracture. Topics include the pioneering work of Griffith on brittle fracture in 1920, Barenblatt's cohesive zone model in 1959, to Marigo/Francfort's variational formulation of Griffith's brittle fracture 78 years later and the Bourdin's phase-field regularisation of MF's model. Also discussed is recent models for cohesive fracture, the role of the length scale parameter, solver for the coupled PDEs and some applications.

Please find attached two recent papers on the use of high order B-splines/NURBS cohesive interface elements for an efficient modeling of delamination of composite laminates.  

Dear all,

Cardiff institute of Mechanics and Advanced Materials is organising the first UK Summer School on Meshless Methods in Mechanics on the 29th and 30th of July 2013. The schedule is below.

Dear all,

Please find enclosed our paper which is published on Journal of Multiscale Modelling
Vol. 3, No. 4 (2011) 1–42 which gives an overview of state of the art multiscale techniques for material modeling. 

The paper discusses the following topics: homogenization, Representative volume element, computational homogenization (Fe2 methods) for both both bulk materials and strong discontinuities. 

I hope the paper is useful for beginners to the field.

All the bests, 

Hello all,

Last year when I started implementing interface elements to model material failure, I realized that the formulation is easy except how to generate a mesh with interface elements. I did a googling to search for such a free program. Amazingly, I did not find any although there are many researchers working on the fracture mechanics field.

So, I wrote a small object-oriented C++ program which reads a FE mesh, duplicates nodes and insert interface elements where asked. The program is able to

(1) insert 1D/2D interface elements everywhere in a FE mesh

Hello,

My name is Nguyen Vinh Phu, a PhD student at Delft University of Technology, the Netherlands. I have been working with Prof. Bert Sluys on a project named "Coarse graining of failure in heterogeneous solids" since July 2007. I am finishing my work and therefore seeking for a postdoctoral position starting after July 2011.

My expertise in computational solid mechanics includes

(1) Finite elements, extended finite elements and meshless methods.

Hi all,

I am conducting some cohesive crack simulations within the framework of XFEM. The cohesive model is an initially rigid traction-separation law for mode I.  In order to deal with negative values of the normal sepration/jump, I use a penalty stiffness K.

Multiscale Methods for Fracture

We
are looking for a Postdoctoral Fellow for a Research Project on
multiscale modeling of material failure. The Postdoctoral Fellow should
have done his/her PhD preferably in Computational Material Science or
otherwise in Computational Mechanics. A strong background in Molecular
Dynamics, multiscale methods such as the bridging domain or bridging
scale method and finite element methods is required.

Hello all

I have spent a large amount of time trying to undertstand the multiscale aggregating method (MAD) of Prof. Belytschko. Unfortunately, I still can not compltely understand the method. 

If there is anyone here in the forum already gets clear about the method, please help me.

 Phu

Dear All,

Could somebody indicate me some literature about the topic "2D
approximation of heterogeneous 3D media"?

In particular I am interested to address following issues:

1) Under which conditions averaging thermal conductivity and young
modulus (or more general, mechanical behaviour) on multiple 2D crossections of an heterogeneous "random"
material can be a good approximation for the behaviour of the real 3D
microstructure

Hello everybody,

I am solving a FE problem on a hetereogeneous medium consisting of rigid phase (Young modulus of about 100 000 N/mm2), a softer phase (Young modulus of 20 000 N/mm2) and pore (Young modulus of 1 N/mm2). The reason that I have to mesh the pore is that there are some elements of rigid phase hanging out in the pores. So, if I do not mesh the pore, then my FE matrix is singular.