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What is stress? Who has ever seen stress? Is stress a physical quantity?

Fri, 2010-09-10 07:44 - Yi-Heng Chen
research
stress
strain
configurational forces
displacement
invariant integral
pseudo physical quantity

What is stress? Who has ever seen stress? Is stress a physical quantity?

Professor Yi-Heng Chen, Xi’an Jiaotong University, 710049, P.R.China

e-mail: yhchen2@mail.xjtu.edu.cn

 

In fact, this question has been bothering the present author for more than 15 years.

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Simulation ENF Specimen with Fibre Metal Laminates in ABAQUS

Fri, 2010-09-10 05:48 - DaniBa
research

Hello everybody,i am trying to analyze a Fibre Metal Laminate ENF specimen for crack porpagation with ABAQUS. Therefore i am using the VCCT method. The model is running, but not with the expected outcome. The problem is that there is no crack propagation, as Mode II energy release rate is Zero. I really don't know why. I am using the "composite layup" function with continuum sheels and SC8R reduced integration continuum shell elements. To get an ENF specimen iam stacking this layup and model a frictionless contact between.

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Ali_Hadjesfandiari's picture

New perspective on Couple Stress theory resolving the indeterminacy issue

Thu, 2010-09-09 15:11 - Ali_Hadjesfandiari
research
nanomechanics
Couple Stress tensor
Curvature tensor
Polar Continuum Mechanics

Dear fellow Mechanicians,We have done this research on couple stress theory which we believe has resolved the problem of indeterminacy in the spherical part of the couple-stress tensor and the appearance of the body couple in the constitutive relation for the force-stress tensor  (Mindlin and Tiersten, 1962).I humbly request you to read the paper and give me your feedback.

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diffusion equation using finite element

Wed, 2010-09-08 14:29 - ayoub
research
finite element analysis
diffusion

Hi,

I would like to write a simple subroutine to solve diffusion equation d(ro)/dt = k∇2(ro). using finite element method.

Any suggestions ?

 

Thanks,

Ayoub 

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Ansys Tutorial for reinforced concrete with FRP

Wed, 2010-09-08 13:56 - David B
research

Does anyone have an Ansys tutorial for reinforced concrete with FRP? I have to model a beam for my thesis and I am new to Ansys. If you could send it to me at the below email address I would greatly appreciate it.

dbright4@utnet.utoledo.edu

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The minimum number of test

Wed, 2010-09-08 08:43 - mahmood seraji
research

Hi

I have to do the experimental test to study the diaphragm action in lighweight slab. it will be grateful if i find some guideline or some advise about that.

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Registration Mimics Innovation Awards 2011 is open

Wed, 2010-09-08 06:04 - Mimics
research
Mimics
CAE
Implant
Materialise
Innovation Awards
MIA
competition
poster

The registration of the 2011 edition of our famous Mimics Innovation Awards is open. So, if you have an interesting research project in which Mimics is used, then you can submit this now! Of course, we reward the winners again with 17,500 Euro in total.

You can participate in 4 categories:

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Registration Mimics Innovation Awards 2011 is open

Wed, 2010-09-08 05:59 - Mimics

The registration of the 2011 edition of our famous Mimics Innovation Awards is open. So, if you have an interesting research project in which Mimics is used, then you can submit this now! Of course, we reward the winners again with 17,500 Euro in total.

You can participate in 4 categories:

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Mimics
CAE
Implant
Materialise
Innovation Awards
MIA
competition
poster
»
Alexander A. Spector's picture

Journal Club September 2010: Modeling the Mechanics of Cellular Membranes

Tue, 2010-09-07 15:47 - Alexander A. Spector
research
adhesion
bending
tension
viscoelasticity
electromechanical coupling
biological cell

Constitutive relations, 2-D vs. 3-D. The starting point for modeling cellular membranes is the constitutive relations in 2-D space. It is important to set up the corresponding equations directly in two dimensions rather than to consider them as an asymptotic limit of three-dimensional relationships, like it is done in the shell theory. The main reason for the direct 2-D relations is that 3-D continuum approaches are not applicable to membranes whose thickness in on the order of magnitude of the dimension of a single molecule.

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Markus J. Buehler's picture

Postdoc position at MIT: Thermal and mechanical properties of nanocomposites

Tue, 2010-09-07 06:08 - Markus J. Buehler
research
interface
molecular dynamics
graphene
metal
thermal
postdoctoral position
Mechanical
nanocomposite
atomistic

A postdoctoral associate position at MIT is available immediately,
focused on the analysis and development of multifunctional thermal
management structures, by using theoretical and atomistic multiscale
modeling and simulation. This project specifically involves calculations
of thermal and mechanical properties of graphene based metal- and
polymer nanocomposites, with a focus on various aspects such as
interfacial transport properties, tunability, mutability and phonon
engineering. Additional aspects of the project relate to the general

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Abaqus Subroutine and fortran

Tue, 2010-09-07 04:44 - moslempayandeh
Forums: 
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research

Dear

I have problem with Abaqus 6.10 and fortran 11,0,6 on WIN 7 x64 platform

When I run Abaqus verification it pass all C++ Fortran  requirement but when it check for subroutine for standard case or explicit it has problem:

It is  std_user.log for error

Linking ['std_user.obj'] into user subroutine shared library

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Hanqing Jiang's picture

A Thermodynamic Model of Physical Gels

Mon, 2010-09-06 09:52 - Hanqing Jiang
research
thermodynamics
free energy
phase transition
Physical gels
Reformation

Physical gels are characterized by dynamic cross-linksthat are constantly created and broken, changing its state between solid andliquid under influence of environmental factors.

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Experimental notch fracture testing to calculate KII

Mon, 2010-09-06 06:09 - laki
research
Stress intensity factor-K II mode
V-Notch

Hi,

I am doing a v-notch fracture testing (experimental) with opening angles from 0,30,60,90,120 to 150 deg and need to calculate KII. I need a equation that could be used to calculate KII for both 0 deg and also for non-zero opening notch angles. I am using TestResources machine to do this shear testing and I will get results in terms of load vs. d. The material is PMMA. What could be the appropriate displacement/min or load to break the specimen.

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poisson's ratio of " graphite ek20 "

Mon, 2010-09-06 05:51 - omidomid
research
poisson's ratio of graphite ek20

 

Dear all

I'm looking for the poisson's ratio of "graphite ek20 ".

Best regards

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Dislocation migration in carbon onions

Sat, 2010-09-04 09:07 - Jianyu Huang
research
dislocations
in-situ TEM
carbon onions

Phys. Rev. Lett. 105, 106102 (2010) 

What does a dislocation look like in a spherical geometry, and how does it migrate in such a structure? We report here the counterintuitive motion of the 1/2⟨0001⟩ edge dislocation in carbon onions from the outer surface to the inner core, i.e. from a low pressure surface to a high pressure core, rather than from the core to the surface as expected due to a surface image force. Maybe you can help us to explain this peculiar phenomenon.

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question about UMAT

Sat, 2010-09-04 03:18 - ml818
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research

I have read Pro Huang's UMAT for many times and one of its subprogramme I can't understand.

Can anybody help me ?

Normal
0

false
false
false

EN-US
ZH-CN
X-NONE

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gyanvikash's picture

Fabric Tensor

Fri, 2010-09-03 02:58 - gyanvikash
research

I am studying the effect of intermediate microfabric on clay's mechanical behavior. In order to develope the constitutive model for clay considering its microfabric, I want to use fabric tensor. If any good paper or study material on fabric tensor is available then please send me.

Thanks

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anilshirahatti's picture

Creep Analysis in Abaqus

Thu, 2010-09-02 20:47 - anilshirahatti
research
ABAQUS
creep
tensile test

Hi all,

I want to FEA of normal tensile creep test using Abaqus. Can anyone suggest me some notes/books/literature.

Thanks

Anil

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question about abaqus

Thu, 2010-09-02 07:15 - rainy_boy
research
question about abaqus

Hi guys

I want to simulate a problem with abaqus,but during runing of my project,percent of process not increas for axample when i change mesh sizes to biger runing go up to 50 % and when i change mesh sizes to smaller than the previos size,it occure again but in 25%

is there any one that know about this problem,i'm trying to solve it for 2weeks but i cann't.

I'm waiting for your suggestions...

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FATIGUE CRACK PROPAGATION-- ITS IMPORTANT

Tue, 2010-08-31 02:48 - Amit S. Kulkarni.
research

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Hello,    

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FATIGUE CRACK PROPAGATION-- ITS IMPORTANT

Tue, 2010-08-31 02:32 - Amit S. Kulkarni.

Hello,

       Currently , I am working on the fatigue crack propagation in ANSYS 12.1. Can anybody help me regarding how to get the next cracktip position?

Currently, I am referring to the paper named, “Mixed mode fracture analysis of aluminium repaired panels using composite patches” , Authors : Hossein Hosseini-Toudeshky, Bijan Mohammadi, Hamid Reza Daghayani.

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