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a43803877's picture

Looking for a postdoc position

Dear Professor,

I am Fan Xie, a PhD in solid mechanics, Beihang University.

jenda_z's picture

Modeling of Localized Inelastic Deformation 2016 (LID 2016)

Dear colleagues,

on behalf of the course organizer, I would like to bring to your attention to the advanced course on Modeling of localized inelastic deformation that will be taught by Milan Jirásek in Prague, Czech Republic on 19-23 September 2016.

Wenbin Yu's picture

RVE analysis without BCs and periodic mesh requirements

RVE analysis becomes a routine exercise in material modeling. Usually it is carried out using finite element codes such as ABAQUS or ANSYS. The main thing one should pay attention is to applying the right boundary conditions. It is settled that periodic boundary conditions are the preferred boundary conditions to be applied. The BCs are that u_i-\epsilon_{ij}x_j should be equal on the corresponding edges. This type of boundary conditions can be applied using coupled equations constraints. This requires that one creates a mesh with corresponding nodes on periodic edges.

Flavio Stochino's picture

RC beams under blast load: Reliability and sensitivity analysis

The effects of blast loading on structures can be very dangerous: damages and failures are expected with serious threats to structural safety and human life. Materials stresses and strains are often pushed to the limit and the modelling of these phenomena can be very complex. In order to design blast-resistant structures it is very important to determine what are the key parameters of this problem.

 

DLOAD, element deletion, new active load surface

Dear all,

Currently I am engaged in solving a geological problem. So we have some soil model in the form of disk, there is a circular hole in the center, which has the initial pressure at the reference time  (a modelling of the soil injection with the polymer compound)

Phase field modeling of phase transformation using Comsol?

Dear members of imechanica,

Does anyone have any exprience in phase filed modeling of phase transformation in comsol? To be more specific, I would like to know if it is possible to solve the field equation and diffusion equation at the same time using Comsol PDE module or any other module?

I know that there are phase field modules for liquid/solid intractions in Comsol. However, what I intend to do is phase transformation or solidification.

 

Thanks in advance.

Relation between E and G for rubber

Hi,

I am working in rubber. Since this is hyperelastic material, I seriously doubt whether I can use the relation E=2G*(1+nu) which is valid for metals.

Is there any relation for rubber as such? Can anyone give me a direction on how to get the relation between these two?

Thanks in advance! 

Kahirdeh's picture

Postdoctoral Research Position at University of Maryland, College Park, MD, USA

Applications are accepted for a postdoctoral research associate position at Center for Risk and Reliability, Department of Mechanical Engineering, University of Maryland, College Park, MD, USA.

Mirkhalaf's picture

RVE size determination

The definition of the size of the Representative Volume Element (RVE) is extremely important for the mechanics and physics of heterogeneous materials since it should statistically represent the micro-structure of the material. In the present contribution, a methodology based on statistical analysis and numerical experiments is proposed to determine the size of the RVE for heterogeneous amorphous polymers subjected to finite deformations.

Shuman_Xia's picture

Call for Papers: Experimental Mechanics Special Issue on “Mechanics of Energy Materials”

Advanced energy materials hold one of the keys to fundamental advances in the conversion, storage, and harvesting of energy for a broad range of consumer electronics, automotive, aerospace, and defense applications. The successful development and deployment of these materials relies critically on a fundamental understanding of strongly coupled multiphysics phenomena.

XFEM ERROR IN ABAQUS

Hello,

I am trying to evaluate the behaviour of a 2D plain strain "cut and cover" tunnel section when I apply static loads (by the moment)

I am using XFEM method in order to evaluate the cracks through the reinforced concrete material. The model has been meshed by CPE4R elements (Quad)

I have modelled 2 types of steps: Geostatic in order to apply the initial stress state and Static, general for the rest of steps.

I am trying to solve the error below:

A xfem analysis with pore pressure degrees of freedom is not supported.

Is it possible to solve buckling in Abaqus with only residual stress defined as predefined load?

Hi Sirs,

As title, I wondering if the problem can be solved with only material residual stress but no other external load applied?

After several trials, Abaqus returns message
"MASS OR DIFFERENTIAL STIFFNESS MATRIX IS COMPLETELY NULL. THE EIGENPROBLEM CANNOT BE SOLVED. IN A *BUCKLE ANALYSIS THE MOST LIKELY CAUSE IS THAT A NONZERO LOADING PATTERN WAS NOT SPECIFIED VIA *BOUNDARY, *CLOAD, *DLOAD, ETC,. SEE Eigenvalue Buckling Prediction IN THE ABAQUS/STANDARD USERS MANUAL"

Ling Liu's picture

PhD Positions in Computational Solid/Fracture Mechanics at Utah State University (USU)

We have 1-2 PhD positions for modeling the fracture and failure in nuclear materials. The funding comes from a collaborative project involving five universities and one national lab.

The students will have opportunities to work with experimentalists and other computational experts at USU and from the national lab.

Requirements:

1. For applicants with no degree from a English-Speaking country: 

TOEFL >= 79 or IELTS >= 6 (and a minimum score of 5 on each subscale)

Weijie Liu's picture

Thermal wave propagation in finite velocity

Hello All,

For the Cattaneo's hyperbolic heat equation with relaxation time,

usually a simple plane thermal wave Τ=T0 * exp[ ¡ (kx - ωt) ], with definition k is the (complex) wave number and ω is the the (real) frequency, is adopted to obtain the dispersion relations of the heat equation.

And consequently, the velocity is defined as: [ω / Re(k)].

 

My confusion is that is it necessary or obligatory to let k be complex and w be real?

If the answer is yes, then why?

If no, then it's possible to let both k and w are real?

 

Weijie Liu's picture

About UEL/VUEL for shell element

Hello, I'm trying to program a quadrilateral classical Mindlin flat shell element (full integration for membrane, bending and selective reduced integration for transverse shear).

Now, the situation is: 
for pure tension test, it works well (because only the membrane part works),
for pure bending test, it gives very bad result compared with S4R, and I find that's because the incremental rotations at each step are different.

Simpleware UK Workshops, June 27-June 29 2016

Simpleware software

 

We're running a series of free workshops at the AMP Technology Centre in Rotherham (June 27th), the University of Liverpool (June 28th) and the University of Leeds (June 29th) this month, where we'll be explaining the benefits of Simpleware for working with 3D image data.

Zheng Jia's picture

[Call for Abstract] [SES 2016 Energy Materials Symposium E-1] List of Confirmed Invited Speakers (As of 14 June 2016)

Confirmed invited speakers:

Sheldon Brian (Brown University)

Sulin Zhang (Penn State University)

Ting Zhu (Georgia Institute of Technology)

Matt Pharr (UIUC)

Shuman Xia (Georgia Institute of Technology)

Vivek Shenoy (University of Pennsylvania)

Wayne Chen (Purdue University)

Yue Qi (Michigan State University)

Yuefei Zhang (Beijing University of Technology)

Shengping Shen (Xi'an Jiaotong University)

 

vacary's picture

Siconos 4.0.0 is out !!

Dear Colleagues,

A brand new Siconos 4.0.0 is out !! Siconos is now distributed under Apache 2.0 license.

What is Siconos ?

Siconos is an open-source scientific software primarily targeted at modeling and simulating nonsmooth dynamical systems in C++ and in Python:

 + Mechanical systems (rigid or solid) with unilateral contact and Coulomb friction and impact (nonsmooth mechanics, contact dynamics, multibody systems dynamics or granular materials).

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