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Yongle Sun's picture

Dynamic compressive behaviour of cellular materials: a review of phenomenon, mechanism and modelling

Dynamic compressive behaviour of cellular materials is crucial to their applications in energy absorption, ballistic mitigation and blast/impact protection. The recent research progress in this subject has led to an improved understanding of the experimental, analytical and numerical observations. This review focuses on the aspects ofphenomena, mechanisms and modelling on the concerned subject.

Ramathasan Thevamaran's picture

A few experimental studies on the dynamic behavior of foam-like aligned carbon nanotubes

I'm posting a few experimental studies we have conducted on the dynamic behavior of hierarchical fibrous materials, using vertically aligned carbon nanotubes as a model material. I hope these will be useful to those who are interested in buckle-instabilities, multiscale behavior, and energy absorption mechanisms.

An overview:

PhD in Biomaterials for Aerospace Composites

Applications are invited for a fully funded PhD studentship at the University of Manchester to help develop the next generation of simulation tools. These will be used to evaluate the structural integrity of novel aerospace composites under a wide range of operational conditions.

Yuli Chen's picture

A novel self-locked energy absorbing system

http://dx.doi.org/10.1016/j.jmps.2015.11.008  Metallic thin-walled round tubes are widely used as energy absorption elements.  However, lateral splash of the round tubes under impact loadings reduces the energy absorption efficiency and may cause secondary damages.  Therefore, it is necessary to assemble and fasten round tubes together by boundary constraints and/or fasteners between tubes, which increases the time and labor cost and affects the mechanical performance

Iriene Elok's picture

Error about Degree of Freedom 11 in Abaqus

Hi friends, I'm new here and also new using abaqus.

I need to do my final project about bird strike analysis using abaqus. But for now, I try to follow the tutorial from youtube about impact bullet first. For some trial sometimes i found errors and never succeed to solve it. Included the impact bullet trial. This is what i've got:

errors:

Degree of freedom 11 and at least one of degrees of freedom 1 thru 6 must be active in the model for *dynamic temp-disp. Check the procedure and element types used in this model.

warnings:

Looking for a postdoc position in US

Hi, all,

I am Kun Luan, a doctoral graduate from China. I am now looking for a postdoc position in damage tolerance, failure analysis, and fracture mechanics for composite materials, and advanced numerical methods for structural analysis. I already got my PhD degree of engineering in March 26,2014.  

drgaurav's picture

call for abstracts - Composite Armor and Ballistic Impact/Failure Dynamics

Dear colleagues,

I am organizing sessions related to “Composite Armor” and “Impact Dynamics” at the following conferences in 2014. I would like to personally invite you and your research group to submit an abstract.

ANSYS , LS-DYNA: simulation of full penetration impact

Is
there any one here who could help me through the step-by-step creating and analyzing
a 3D simulation of ballistic, full penetration impact of a steel, rigid
projectile into the 3D composite plate?

note1: as i know,
available HASHIN damage model in ABAQUS isn't an appropriate tool to do
that. because it has an important restriction that confined you in the
"2D" damage analysis of composites and using 2D planar elements only.

CliveSiviour's picture

Doctoral Studentship in high strain rate properties of Nickel Alloys

The Department of Engineering Science at Oxford University has recently obtained an iCASE studentship funded by EPSRC and Rolls-Royce plc to perform research into the mechanical behaviour of metals at high temperatures and high strain rates. The studentship provides full funding (fees and stipend) at the home / EU level for 3.5 years.

Ettore Barbieri's picture

DPhil Studentship at University of Oxford - funded by Rolls-Royce

Dear All,

we have a DPhil studentship available in the Solid Mechanics and Materials Engineering Group, within the Impact Engineering Laboratory led by Prof Nik Petrinic.

Simulation of composite delamination caused by impact

Hi All,

While using LS-DYNA to simulate the impact damage of composites, I have a question about modeling.

I plan to create the model by solid element. Each ply has one element in the thickness direction. The contact between plies is *contact_automatic_surface_to_surface_tiebreak. My question is how to create separate ply models while using this contact. It is clear that common nodes are not allowed. So there might be two possibilities.

jason Zhu's picture

New paper on impact behaviour of GLARE(Fibre-metal Laminates) is available on line.

Dear all, 

 A paper on the Low-Velocity Impact Response and failure characteriztion of Fibre-Metal Laminates – Experimental and Finite Element Analysis, has been issued by

Composites Science and Technology

error in lsprepost file

Hi there,

 

I'm using LS-DYNA as a tool in my study. Currently, i'm facing this problem:

 

Run-time check failure#3 - the variable 'count_ntime' is being used without being initialized

 

Please...help me...I've done so many new models, yet the same error keep occurring...

 

Thanks... 

 

p/s: i can be reached by this e-mail: man@ppinang.uitm.edu.my 

International Conference on Fatigue Damage of Structural Materials IX, 16-21 September 2012

Register today to book your place at this prestigious conference, which has attracted over 290 abstracts. This is a significant opportunity for you to join leading researchers to exchange and discuss new ideas and findings. http://www.fatiguedamageconference.com/conference-register.html

Tissue strain-rate independence

Choose a channel featured in the header of iMechanica: 

I have two basic questions for the experts in the soft tissue biomechanics community. 

a) I am interested in the biomechanics of a specific tendon in a specific high-speed deformation. How plausible is it for me to assume strain-rate independence, and therefore, the existence of a strain energy function? In other words, how accurate is the assumption of pseudoelasticity for tendons under high strain-rate? I feel comfortable with the assumption (evidence would help a lot, however) for tissues such as mesentery, skin and, I guess, even muscle. 

v.tagarielli's picture

PhD opportunities @ Oxford (for EU / UK nationals)

Dear iMechanica commmunity,

we are looking for 3 PhD students at Oxford, starting from the 1st of October 2010 or as soon as possible thereafter. The closing date for the application is the 26th of July. The 3 students are required for two different research projects, namely:

 

1) Underwater blast on composite structures - open only to EU nationals; 2 PhD students are required. The studentships are advertised here

Henry Tan's picture

lecture note

Lecture note for the course (28 Sept - 2 Oct, 2009) at the International Centre for Mechanical Sciences (CISM), Udine, Italy.

Henry Tan's picture

Journal Club Theme of December 2009: Impact Behaviour of Materials with Cellular Structures

Choose a channel featured in the header of iMechanica: 

Welcome to the forum! Discussion topics were suggested initially as follow:

Metal foams, cell deformation (bending, buckling, plasticity and fracture), constitutive stress-strain behaviour of cellular materials, energy absorption, hypervelocity impact, shock wave behaviour, 1D shock modelling, shock attenuation, shock enhancement, Material Point Method (MPM) simulation and microscopic tomography experimental observation;

and later were extended to many related:

Henry Tan's picture

Impact of cellular materials

As the title suggests, there are two focuses of this discussion theme: impact and cellular materials.

Impact protection can be very practical problems in safety, fires and explosions, oil and gas industry, subsea structures, car manufacturing, nuclear industry, rocket space engineering, etc.

Three postdoctoral positions at Lawrence Livermore National Laboratory

The Computational Physics group in the Atmospheric, Earth, and Energy Division at the Lawrence Livermore National Laboratory (LLNL) is solicitating applications for three postdoctoral appointments in the following areas. To access the full description and application instructions, please visit http://jobs.llnl.gov and search for the job numbers below:

008351: geomechanics of fluid-induced fault activation

008374: dynamic impacts into granular materials

008375: mechanics of dynamic impact and penetration into ceramics

Impact in Composites

Hello,

I'm doing some research in aircraft protection against impact, mainly refering to UAV's protection of the payload (avionics,etc..) during crash.

Does anyone knows where I can get some info about related topics (impact in composites, collision protection, reinforcement of structures, etc..)?

 

Thanks, Ivo Pires

Material model of Kevar composite for Impact problem

I am looking for material model of Kevlar composite for Ballistic impact simulation. Presently i am using ANSYS. Can any body suggest material model for kevlar composite for fracture and penetration phenomina.

Henry Tan's picture

Industrial Placement & Individual Projects (2007/2008)

Industrial Placement (2007/2008)
Supervisor: Henry Tan
School of Mechanical, Aerospace and Civil Engineering
The University of Manchester

Material Point Method for impact, fracture, fragmentation and explosion
Mr. Jayveer Thakoor

Industrial Placement: Optimising superplastic form die shape for next generation aero engine production, a design project from Rolls-Royce plc.
Mr. Waqas Ahmad

 

Henry Tan's picture

Experiment 2: Mechanical Testing- Impact & Hardness Testing

The mechanical properties of materials are ascertained by performing carefully designed laboratory experiments that replicate, as nearly as practical, the service conditions.

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