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Cellular Automata for Multi-scale Fracture

Submitted by Lee Margetts on
research
3D fracture
brittle fracture
Cellular Automata
computational mechanics
finite elements
application of fracture mechanics

Could cellular automata be used to model mechanisms (for quasi-brittle fracture) that occur at the meso-scale and then feed these mechanisms to a macro-scale finite element model? Is it possible to replace constitutive models with mechanistic models, simulating mechanisms that lead to fracture instead of formulating equations that predict failure? These are typical questions that have motivated my recent collaboration with Dr Anton Shterenlikht at the University of Bristol.

application for a post doc

Submitted by aelmoumen on
research
Dear imechanica members,
 
My name is Ahmed El Moumen and I am posting this blog in searching for postdoctoral positions in Computational Solid Mechanics and heterogeneous materials modelling.
 
I obtained Ph.D. in Computational Mechanics at Lille 1 university/mechanics laboratory of Lille. My thesis work involves developing multiscale method to predect the elastic and plastic behavior of heterogeneous materials using homogenization techniques.
 

Residual Stresses and Poisson’s Effect Drive Shape Formation and Transition of Helical Structures

Submitted by zichen on
research
elasticity
helical ribbon
Poisson's effect
shape transition
residual stress

Strained multilayer structures are extensively investigated because of their applications in microelectromechanical/nano-elecromechanical systems. Here we employ a finite element method (FEM) to study the bending and twisting of multilayer structures subjected to misfit strains or residual stresses. This method is first validated by comparing the simulation results with analytic predictions for the bending radius of a bilayer strip with given misfit strains.

CutExtrude error Abaqus

Submitted by dotsrcool on
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cold-formed steel
ABAQUS

Hi all, 

I'm trying to create a full-scale truss for a static loading simulation using Abaqus.
I wanted to use a Python script to do this, but I am not very experienced with this language or the Abaqus methods.

The members forming the truss are cee sections. However, at the ends of the cee sections I want to create an extruded cut

like so:
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However, when I try to use the CutExtrude command, Abaqus keeps giving me an "Invalid sketch plane" error even though I'm sure that the face I'm putting in the CutExtrude method is correct.

Getting elastic constants using LAMMPS .

Submitted by AKSIL Sara Keltoum on
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Computational Mechanics Forum
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LAMMPS
nanomaterials
elastic constants

Hello everyone , 

LAMMPS suggests a script to calculate C44 , C11 & C12 .The question is : How to calculate the others for a nanomaterial ? Thanks in advance ! 

Summer School on Fatigue and Damage Mechanics of Composite Materials

Submitted by michele.zappal… on
research
damage mechanics
Composites
Fatigue and Fracture

Dear Colleagues,

we are glad to present the Summer School on Fatigue and Damage Mechanics of Composite Materials (13 . 17 July 2015) and the Short Course on Experimental Techniques and Testing of Composite Materials (9 . 10 July 2015) organized by and to be held at The Department of Management and Engineering  - University of Padova in Vicenza - Italy.

Post-doctoral position in Montréal on crystal plasticity in collaboration with the aerospace industry

Submitted by martin.levesque on
research

Hi

I am looking for a 12-15 months post-doctoral fellow to work on crystal plasticity finite element simulation of impacts. This project is parts of a larger collaborative project with Pratt and Whitney, Bell Helicopter, L3 and Héroux Devtek aiming at understanding the effects of shot peening on fatigue life. The project involves 3 other post-doctoral fellows and 4 PhD students.

The starting date is flexible and could be as soon as now, depending on the candidates expertise.

The interested candidates are invited to send me their CV and publication lists.

sound propagation simulation in abaqus challenge

Submitted by shabuK on
research

Dear friends,

           I am simulating sound propagation in mild steel.

frequency=5MHz mesh size=0.5mm

time incriment of wave amplitude=1e-9

instead of giving force at a node i have given boundry displacement

U1=5.8e-10

U2=-8e-10

instead of showing sound propagation, my entire specimen(mild steel with 15 mm thickness) deflecting like a wave.I would like to know 1)what is the reason for that deflection?

2)what may be the possible solution?

Asymmetric flexural behavior from bamboo’s functionally graded hierarchical structure: Underlying mechanisms

Submitted by Yang Lu on
research
biomechanics
nanomechanics
bamboo
cellular materials

As one of the most renewable resources on Earth, bamboo has recently attracted increasing interest for its promising applications in sustainable structural purposes. Its superior mechanical properties arising from the unique functionally-graded (FG) hierarchical structure also make bamboo an excellent candidate for bio-mimicking purposes in advanced material design. However, despite its well-documented, impressive mechanical characteristics, the intriguing asymmetry in flexural behavior of bamboo, alongside its underlying mechanisms, has not yet been fully understood.

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