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Jamie Guest's picture

Journal Club Theme of January 2015: Topology Optimization for Materials Design

Processing technologies are rapidly advancing and manufacturers now have the ability to control material architecture, or topology, at unprecedented length scales. This opens up the design space and provides exciting opportunities for tailoring material properties through design of the material’s topology. But as seen many times in history with advancements in materials and processing technologies, the natural default is to rely on familiar shapes and structure topologies.

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How to model random dispersion of MWCNTs in epoxy resin

Dear All,

I want to start some research on the Multi walled Carbon nano - tubes/ Epoxy resin.

In the begining I need to model a random dispersion of MWCNTs in epoxy resin in  the ABAQUS.

 

Can any help me in this problem.

 

Thank you in advance.

want to start some research on the Carbon nano - tubes. In the begining I need to model a CNT in the ABAQUS.

Leon Mishnaevsky's picture

Symposium on Nanoengineered composites: 15-17.7.2015, Denmark

International Symposium on

NANOENGINEERED COMPOSITES: Properties, modelling and applications

July 15-17, 2015, Roskilde, Denmark

Concrete block under thermal load

Dear all,

I am new to abaqus and trying to analyze the thermal analysis on a concrete block of size 0.15 x 0.15 x 0.15.

The surface heat flux of magnitude 100 that I am giving is only from one side and NOT having any boundary conditions.

If I choose steady state condition then I get an error as "Time increment required is less than the minimum specified".

Also I cannot define time period. I want the nodal temperature of concrete subjected to thermal load from one side for 24 hours of heating at 100oC.

Please help!

Using different types of stress rates in ABAQUS UMAT

Dear friends,

As you maybe know, ABAQUS uses the Jaumann or Green-Naghdi stress rate for large deformation analysis. Recently i found some refrences that show these stress rates leads to major errors for some special cases. Now my question is, how can I change the stress rate used  in analysis process using ABAQUS UMAT?

Julian J. Rimoli's picture

Call for Abstracts: "Advances in Computational Methods for Heterogeneous Materials"

As part of the 13th US National Congress on Computational Mechanics to be held in San Diego, CA, on July 26-30 2015, it is our pleasure to invite you to submit an abstract to the Symposium “Advances in Computational Methods for Heterogeneous Materials”.

Zezo7790's picture

What is the Mechanical properties of Spandex?

   Hello everyone I'm new here, Hope you can help me!

I was looking for an elastic material and I found a material called Spandex or Lycra(its trade name) I tried to find its mechanical properties on internet, but could not find specific calculation such as its Yielding stress and its modulus of elastisity(E), the most important thing i need is to find the maximum force or stress that it can stand.

Thank you.

 

Postdoc position on multi-scale modelling of composites vibration response @ Ghent University (Belgium)

Nowadays, there is an increasing interest to use composite materials in automotive applications, in particular the use of fibre-reinforced plastics (carbon or glass fibres in a polymer matrix) is widely considered. The use of lighter materials, and hence a reduced fuel consumption, can be one of the possible solutions for reduced CO2 emissions.

PhD position on multi-scale modelling of fatigue damage in composites @ Ghent University (Belgium)

The core idea of this project is to develop a consistent multi-scale modelling framework for fatigue damage in unidirectionally reinforced composites. Three scales are distinguished:

Postdoc on FE simulation of 3D printed cellular structures @ Ghent University (Belgium)

"3D printing" is a popular term for the layerwise manufacturing of metals or polymers with a printing head, that builds up the component with droplets of molten polymer or metal into a 3D shape. The geometries that can be realized with this technique, can be very complex, and this with a minimum of material usage, because no material has to be milled away. Further, very lightweight materials can be achieved. Flanders region plays a leading role in Europe in this 3D printing sector, with important industrial players such as Materialise, Layerwise and Melotte.

PhD position in Mechanical Engineering available (EU/UK applicants only)

In many areas of engineering, materials and structrures are subjected to deformation at high rates (e.g., impact, crash, blast). Therefore, it is essential for design engineers to have reliable mechanical models to predict the behaviour of the materials in such applications. It is proposed in this project to extend the Virtual Field method to high velocity loading conditions where inertial forces affects significantly the deformation mechanisms of the material under dynamic loads.

Alejandro Ortiz-Bernardin's picture

THREE FACULTY POSITIONS ARE CURRENTLY OPEN IN MECHANICAL ENGINEERING AT UNIVERSITY OF CHILE

The Department of Mechanical Engineering (www.dimec.uchile.cl) at University of Chile invites applications for three full time tenure-track faculty positions in Mechanical Engineering. Applicants must have deep interest in undergraduate and graduate teaching, as well as the purpose to conduct long-term, externally funded research programs at international level. Candidates are also expected to maintain fruitful work relationships with industry in their respective areas through R&D initiatives.

iasigal's picture

Postdoctoral Fellowship in Soft Tissue Biomechanics and Imaging, University of Pittsburgh

Available immediately.

     The Laboratory of Ocular Biomechanics at the University of Pittsburgh is seeking candidates for 1-2 postdoctoral fellow positions on projects related to using biomechanics and imaging to understand aging and vision loss. Specific duties will involve in-vivo and ex-vivo imaging, development of numerical models integrating complex material properties, analysis and interpretation of the results, manuscript preparation and presentation of the results in national and international meetings.

Moving Load in ABAQUS

I am trying to incorporate moving point load on a beam in ABAQUS but not sure which is the best way to do it? Can someone help?

mohsenzaeem's picture

Effect of variant strain accommodation on the three-dimensional microstructure formation during martensitic transformation: Application to zirconia

This paper computationally investigates the effect of martensitic variant strain accommodation on the formation of microstructural and topological patterning in zirconia. We used the phase-field technique to capture the temporal and spatial evolution of embryonic formation of the monoclinic phase in tetragonal single crystals. The three-dimensional simulations were able to capture the formation of all the possible monoclinic variants. We used the multivariant single embryo as an initial condition to mitigate the lack of nucleation criteria at the mesoscale.

Enable User Routine in DEFORM

Hi,

I am going to use user routine in DEFORM, however, I heard that I still need to install a software as a complier called ABSOFT. I wonder if anyone knows what to do after I installed the ABSOFT.

Btw, can ABSOFT act as a Fortran complier individually just as Intel Fortran in Visual studio?

Thanks a lot in advance!

Best wishes,

XXX

shear stresses in abaqus : Is S13 same as sigma_xz?

Hi,

 

I have a 0/90/0 rectangular laminate (all 3 D solid elements) . When I plot a through thickness shear stress S13, I want to know if the results are in the local coordinate system or the global coordinate system x-y-z.

Erkan Oterkus's picture

Mini-symposium on Peridynamics and Nonlocal Models at USNCCM13

Dear Colleagues:

As part of the USNCCM13, we are organizing a mini-symposium on “Peridynamics and its applications”.

Anisotropic stiffness of isotropic material

Dear colleagues,

 

Consider a simple non-linear elastic material with stress given as

σ = D(εdev) εdev + B εiso

where εdev is the norm of εdev, D is a function of εdev and B is constant. The material is isotropic since the principal directions of  σ and ε will coincide.

If we differentiate σ wrt ε to obtain the material stiffness the form of the stiffness tensor will be

virginierollin85's picture

Faculty position in Aerospace Engineering at the Associate or higher level - Embry-Riddle Aeronautical University

The department of Aerospace Engineering at Embry-Riddle Aeronautical University is currently looking to fill a position at the Associate or higher level in the area of structures. The candidate should have an exemplary record of teaching and scholarly activities including externally funded research. The candidate should be able to teach our structures and fracture mechanics classes at the undergraduate and graduate levels.

Cai Shengqiang's picture

Diffusion-induced wrinkling instability in a circular poroelastic plate

A poroelastic material can imbibe solvent and swell. When the material swells inhomogeneously or

swells under external constraints, stresses can develop inside the material. The stresses can trigger

mechanical instabilities in the material or even break the material, which have been often observed

in experiments. In this paper, we study the wrinkling instability of a circular poroelastic plate, in

the process of solvent molecules migrating into the plate from the edge. The critical conditions for

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