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azadpoor's picture

New Nature journal launched: Nature Communications

The first issue of the new interdisciplinary Nature journal (Nature Communications) is avilable online. Here is the description of the journal from the website of the journal:

about the open source code for FEM

Hi, I am wondering whether there is any open source code for FEM for very simple cases. Thanks.

Help with curved specimen and mechanical loading

Background:
Rib fractures in infants are highly suggestive of child abuse. I am performing mechanical testing and finite element analysis on pig ribs with the aim of characterising the behaviour of ribs under anterior-posterior (from end to end rather from the side) loading.

Help needed:

Julien Yvonnet's picture

Multiscale method with model reduction

Model reduction based on Propper Orthogonal decomposition is widely used in Computational mechanics to reduce the number of degrees of freedom in systems. In the attached papers, we introduced a POD-based model reduction in a multiscale framework to significantly reduce the computations.

Analysis of FIBRE REINFORCED BEAM COLUMN JOINT SUBJECTED TO REVERSED CYCLIC LOADING

I have modeled a beam column joint with steel and concrete by using 5 parts. Is it essential to give contact between the  5 parts?. How to give material properties for ordinary concrete and fibre concrete?. please help me that how to give reverse cyclic load in ABAQUS.

   with regards

           B.Thanukumari

arash_yavari's picture

Finite-Temperature Atomic Structure of 180^o Ferroelectric Domain Walls in PbTiO_3

In this letter we obtain the finite-temperature structure
of 180^o domain walls in PbTiO_3 using a quasi-harmonic
lattice dynamics approach. We obtain the temperature dependence of
the atomic structure of domain walls from 0 K up to room
temperature. We also show that both Pb-centered and Ti-centered
180^o domain walls are thicker at room temperature; domain
wall thickness at T=300 K is about three times larger than that of
T=0 K. Our calculations show that Ti-centered domain walls have a

Mike Ciavarella's picture

Suresh's group Fighting Malaria: Understanding the Biomechanical Properties of Red Blood Cells

Suresh's group Fighting Malaria: Understanding the Biomechanical Properties of Red Blood Cells

Subra Suresh with Quinn

MIT Dean of Engineering Subra
Suresh with graduate
student David Quinn. Photo: L. Barry Hetherington

 

obtaining stress-strain curve parameters

Dear All,

In one of my elastic-plastic simulations, I have used the Combined hardening model with half-cycle to model its plastic behaviour. So, I've fed in a list of values from experimental data. Now, I understand that ABAQUS uses certain parameters to generate the stress-strain curve from the data that I've provided.

Is it possible to find out these parameters used by ABAQUS?

Thanks in anticipation,

Aneesh

N. Sukumar's picture

Linear scaling solution of the all-electron Coulomb problem in solids

In this manuscript (available at http://arxiv.org/abs/1004.1765), we present a systematically improvable, linear scaling formulation for the solution of the all-electron Coulomb problem in crystalline solids. In an infinite crystal, the electrostatic (Coulomb) potential is a sum of nuclear and electronic contributions, and each of these terms diverges and the sum is only conditionally convergent due to the long-range 1/r nature of the Coulomb interaction.

Bo Li's picture

How is the entropy of polarization in dielectric material

In the study of thermoelastic actuation of dielectric elastomer, we can write the Helmholtz free-energy as a function of stretch ratio, nominal electric displacement and temperature (T).

The entropy (S) is the negative partial differential coefficient of W with respect of temperature (T). And we can see the change of S is due to three components: deformation, heat conduction and polarization. In an isothermal state, the deformation part has been fully investigated by Arruda and Boyce in 1993, but the polarization-induced entropy (Sp) has not been clearly stated.

Failure criteria for fabric composite or woven composite

Hi All,

Most exisiting failure critera delevolped for fiber composite laminates and they are rough estimations for fabric composite. I want to know if there is a suitable failure criterion for fabric composites.

Thanks

Azadeh

abaqus - ball indentation- high value of stress

Dear all,

I have modeled a cyclic ball indentation problem in
Abaqus. The sphere has been modeled as axisymmetric rigid surface while
the plate is axisymmetric deformable. The material data fed in for the
plate has been obtained from low cycle fatigue experiments and the
combined hardening model using half-cycle has beem employed.

Amit Acharya's picture

Continuum Mechanics of Line Defects in Liquid Crystals and Liquid Crystal Elastomers

Amit Acharya and Kaushik Dayal

 (To appear in Quarterly of Applied Mathematics)

This paper presents a generalization of traditional continuum approaches to liquid crystals and
liquid crystal elastomers to allow for dynamically evolving line defect distributions. In analogy with
recent mesoscale models of dislocations, we introduce fields that represent defects in orientational
and positional order through the incompatibility of the director and deformation ‘gradient’ fields.

Mohr Coulomb model -Cap model

Hi

I have a problem with the simulation of Mohr Coulomb problem. I want to set the properties of a sand. I use the experimental data from papers and i try to find the bearing capacity for a footing on sand. I set density ρ, E modulus of elasticity , ν Poissoin's ratio and for the Mohr Coulomb model i set φ shear strength, ψ dilatancy , c cohesion (a very small value=0.00001 ) for strain 0 . Does it need anything else? Does it need for hardening parameters any diagram for cohesion -plastic strain for the Mohr Coulomb model? 

A tool to help in your Literature Survey

 

Dear All,

             There is an excellent tool called Mendeley that can be freely downloaded from (www.mendeley.com). It helps you in organizing the literature collection and  in optimizing the literature review process.

 

Thanks and Regards,

Naga Sai Rohith

Stress intensity factors at crack tip for beam with a hole

Hi everybody,

I am dealing with a beam with a hole containing a crack loaded at the mid-span. I am wondering if the stress intensity factors

(KI, KII) closed form solution have been expanded for this case or not? I would appreciate if anybody could hlep me about this

case.

Thank you,

Parisa

Jianliang Xiao's picture

Materials and Mechanics for Stretchable Electronics

A review paper on stretchable electronics written by Professors John A. Rogers, Takao Someya, and Yonggang Huang was published in a recent issue of Science . This paper gives a nice summary on the recent advances in inorganic and organic stretchable electronics. Materials, structures and mechanics of these systems are discussed. Many attractive applications of stretchable electronics are introduced, such as stretchable silicon circuit, electronic eyeball camera, and flexible LED display. 

Different Cohesive Section

Hello Everyone,

  I am modeling cohesive layer(defined as a part) resting on a rigid body. I am trying to give different cohesive properties to the same cohesive layer. So I created 6 cohesive sections by partition. 3 sections have one cohesive property and the other 3 section have the second cohesive property. I have assigned sections through Abaqus/CAE. During the data check itself the job terminates with an error

Different approaches for simulation Roll Forming process (ABAQUS & SHAPE-RF)

 Hi all.
Nice to meet you  

I have the report on simulation Roll forming process by ABAQUS.

Wish that I can have your valuable comments  

Buckling analysis using ansys

Hai all, I am performing shear buckling analysis of plate girdersusing ansys. The ultimate shear buckling strength can be easily obtained by applying concentrated load on the model. My issue is to obtain critical shear buckling strength accurately. Some tutorials tell that critical buckling can be obtained from the load - deflection curve where large deformation is initiated.How can i track values exactly. I there any alternative method to track critical buckling.If anyone finds a solution, please reply......     

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Jianliang Xiao's picture

A Conformal, Bio-Interfaced Class of Silicon Electronics for Mapping Cardiac Electrophysiology

In this paper recently feature on the cover of Science Translational Medicine, we report the development of a class of mechanically flexible silicon electronics for multiplexed measurement of signals in an intimate, conformal integrated mode on the dynamic, three-dimensional surfaces of soft tissues in the human body. Mechanics model shows that the strain in the fragile materials, e.g. silicon, is several orders of magnitude smaller than the fracture strain, when wrapped onto the curvilinear cardiac surface.

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