Designing Safer Vehicles with Realistic Simulation of Airbag Deployment

Airbags are one of the major protection systems used in a car crash. They play one of the most important roles in preventing severe injuries and fatalities during vehicle crashes. The advancement of new technology and airbag regulations necessitates that airbags be tested for safety in all kinds of scenarios, including situations where the occupant interacts with the airbag before it is fully deployed.

Understanding the gas flow of the airbag is critical to understanding airbag performance. The Coupled Eulerian-Lagrangian Method in Abaqus/Explicit offers a sophisticated technique that can be used to simulate the dynamic gas flow in the airbag and realistically predict the shape of the airbag and pressure distribution during all stages of deployment.

Markus J. Buehler's picture

Post-­‐doctoral research fellowship: Molecular mechanics of bone

Top candidates are sought for a collaborative research project between Dr. Sandra Shefelbine (Department of Bioengineering, Imperial College London) and Dr. Markus Buehler (Department of Civil and Environmental Engineering, Massachusetts Institute of Technology).  This project will use molecular modelling techniques and associated experimental methods to explore the collagen-apatite interface in bone. 

Shefelbine’s research group experimentally examines the structure and mechanics of bones (  Buehler’s research group focuses on computational materials science of structural protein materials (

Stress Field near a crack tip with different crack fibre orientations of an orthotropic lamina

I was going through these papers:

1.P.K. Sarkar and S.K. Maiti, 'Prediction of mode-1 fracture toughness of unidirectional fibre composites with arbitrary crack fibre orientation from its lowest or matrix fracture toughness'. int. J. Fracture, vol. 40. pp. R91-R96, (1989).


2.S.K. Maiti and P.K. Sarkar, 'A method of calculation of total strain energy release rate and its layer-wise distribution for an arbitrary through the thickness crack extension in a composite laminate', Engg. Fracture Mechanics, vol. 36, pp. 639-646,(1990).



barbarossapao's picture

Postdoc position available on atomistic simulations of water/graphene interface

A postdoc position is available next January at Research Center for Applied Sciences, Academia Sinica in Taiwan on the molecular simulation of the water/graphene interface.

For those who are interested, please contact Chun-Wei Pao ( or Jer-Lai Kuo (


How to model the composite slab (PSSDB system) in order to study the diaphragm behaviour of system

I am going to study the diaphragm behaviour of the composite slab (PSSDB system) under the lateral loading. the PSSDB system comprise of profiled steel sheeting and dry board that are attached by screws. Concrete could be used as a infill material to improve the insulation of the system. having the concrete would improve the structural behaviour of the system.

I am going to simulate the system using FEM package (such as ANSYS or ABAQUS). the obtained results from FEM package would then be verified by experimental results that must be done by myself.

I need your help to know how to model the system in FEM.

deformable bodies

Applications of deformable bodies and their simulations?

Hao Meng's picture

Mechanics of porous material

Hi all,

I am going simulate a plate of porous material (SiC) to evaluate its strengh.

Would someone share some knowledge on the mechanics of the porous materials.



Liu Jinxing's picture

A question on UMAT implementation of non-local theory


Hi, friends,

Now, I am implementing the non-local continuum theory in ABAQUS through UMAT programming.

Unfortunately, I have been obstacled by the following question:

On one hand, in non-local continuum theory, the non-local strain of every particular integration point is determined by the global strain field all over the specimen.

looking for heat engine simulation software


I am wondering if anyone here knows of a generic heat engine simulator. I.e. something that can simulate the behavior of reciprocating engines, Stirling engines, and so forth.

The outputs I'm interested in include things like power and efficiency. The input variables that I would play around with include engine dimensions and material properties.

The approaches I've found tend to be CFD type simulations, but I'm not particularly concerned with fuel flow or combustion. In fact, for my purpose I could abstract the heat source as a simple heat flow. The heat transfer parts are what concerns me, mostly.

Tensile coupon test - simulation of tensile coupons (after necking)

I have carried out several coupon tests (rectangular coupons similar to
those of ASTM E8). Some of these tests have kind of weird behavior. The
problem arises when I simulate results with ABAQUS. It goes pretty well
until a few steps after necking. Test and ABAQUS results match exactly
until several steps before fracture. After this point, there is a
discrepancy between results and my attempts in capturing the observed
behavior was unsuccessful. (around 10% or more plastic strain).

Stephane Bordas's picture

UK Newton Post-Doc Fellowship in Computational Mechanics

Dear All,

A new multi-million pound initiative to fund research collaborations and improve links between UK and overseas researchers has been launched.

The Newton International Fellowships aim to attract the most promising, early stage, post-doctoral researchers working overseas, who do not hold UK citizenship, in the fields of humanities, engineering, natural
and social sciences.

The scheme provides funding to successful candidates for up to 2 years to work with research groups at a UK research Institution and to establish long term international collaborations.

nafemsNA's picture

NAFEMS NA 2008 Regional Summit: NAFEMS 2020 Vision of Engineering Analysis and Simulation (Hampton, VA - Oct. 29-31, 2008)

Hi everyone,

I just wanted to let everyone know about the upcoming NAFEMS North American 2008 Regional Summit: NAFEMS 2020 Vision of Engineering Analysis and Simulation. This is an excellent opportunity for academic researchers, industrial practitioners and software developers to meet for mutual benefit.

For those of who you not familiar with NAFEMS, it is a non-profit, vendor neutral, engineering analyis community.

At this moment, we have an excellent keynote line-up, including the following individuals: Prof. Ahmed Noor (Old Dominion University), Dr. Takeshi Abe (Ford Motor Company), Prof. Tom Hughes (Univ. of Texas-Austin), Prof. Mary Boyce (M.I.T.), and Dr. Joel Orr (Cyon Research).

Stephane Bordas's picture

A Ph.D.+MSc Position on Brain Surgery Simulation by XFEM and FleXFEM

High Performance Computing MSc+Ph.D. position available at the University of Glasgow on Massively Parallel Brain Surgery Simulation with the extended finite element method (XFEM and FleXFEM)  (University of Glasgow) -- funding body is EPSRC.

One year MSc in HPC in Edinburgh (all costs covered by funding) + 3 year Ph.D.  and access to HecToR, one of the world's largest super-computer, including training with experts in massively parallel simulation (10,000+ processors).

Supervisor: Dr Stephane Bordas,Dr Lee Margetts (Manchester)

Collaborators: Prof. Ray Ogden and Prof. Gerhard Holzapfel

Markus J. Buehler's picture

Postdoc position available at MIT / Hierarchical nanomechanics of amyloid protein materials

A postdoctoral associate position at MIT is available immediately, focused on elucidating the fundamental material science concepts that control the formation, behavior and in particular mechanical failure and fracture of fibrous amyloid protein materials. Amyloids form pathogens in diseases (Alzheimer’s, Parkinson’s), play a role in defining the properties of spider silk, and are found in many natural adhesives. These beta-sheet rich protein structures constitute an intriguing class of protein materials that self-assemble at room temperature to form characteristic hierarchical nanostructures and fibers, which combine exceptional strength and sturdiness, elasticity with bioactivity and the ability to self-heal. 

Abaqus / polymer simulation

Hi all,

I'm trying to model a peel T test on a composite material composed of steel and polymer (polypropylen) on Abaqus 6.7. Between these parts, there are cohesive elements COH3D8.
I have a problem with my model and I don't understand it. You can visualize my results in attachs files.
For understand this draw, a few precisions:
The elements in white has just here to guide the materials.
In B (cf attachs files), the nodes are embedded.
In A I applied a velocity.
In C I applied rotation constraints and coupling constraints on all rotations and displacements.
My structure present a strange evolution in the red circle. I don't understand this.

jcliao's picture

Call for Papers: Multiscale Modeling and Simulation: from Molecules to Cells to Organisms

Dear Colleague,

We want to draw your attention to and encourage your participation in a special session on Multiscale Modeling and Simulation of the thirteenth Pacific Symposium on Biocomputing (PSB), to be held January 4-8, 2008, on the Big Island of Hawaii. PSB is an international, multidisciplinary conference with high impact on the theory and application of computational methods in problems of biological significance. 

Mahdi Kazemzadeh's picture

crack instabilities around tips in Molecular Modellings

Considering the MD (molecualr dynamics) simulation programs, they enable us to define the initial crack and then using different theories they propagate the crack. This process is actually a dynamic feature at least when the sample is going to fail. Here is the question that present in the most modellers assumptions, which will limit the simulation or maybe it is not possible to simulate the process with out these assumptions. One of them which I would like to know your ideas about is the linear velocity which come into conclusions before the simulations start. Actually is this linear velocity remains constant or increase with definite constant acceleration (rate) as crack propagates? I think the answer is No, so why we assume that this theory is accurate?

Cai Wei's picture

New Book: Computer Simulations of Dislocations, by Vasily V. Bulatov and Wei Cai

Companion web site ISBN:0-19-852614-8, Hard cover, 304 pages, Nov. 2006, US $74.50.

This book presents a broad collection of models and computational methods - from atomistic to continuum - applied to crystal dislocations. Its purpose is to help students and researchers in computational materials sciences to acquire practical knowledge of relevant simulation methods. Because their behavior spans multiple length and time scales, crystal dislocations present a common ground for an in-depth discussion of a variety of computational approaches, including their relative strengths, weaknesses and inter-connections. The details of the covered methods are presented in the form of "numerical recipes" and illustrated by case studies. A suite of simulation codes and data files is made available on the book's website to help the reader "to learn-by-doing" through solving the exercise problems offered in the book. This book is part of an Oxford Series on Materials Modelling.

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