User login

You are here

research

Mohr-Coulomb Shell in Abaqus. Help!

Choose a channel featured in the header of iMechanica: 

Hi,

I am new to Abaqus and I am trying to use it to model some industrial shells. According to some preliminar studies, the material has a mohr-coulomb plastic behaviour. Thus, I wanted to use shell elements, with a mohr-coulomb plastic material, but it seems that it is not possible in Abaqus.

According to the theoretical manual and the user manual (18.3.3-6):

RJC model constants

Hi everybody

could some one give me the Revised Johnson Cook model constants for Mild steel.

 

thanks in advance

 

Jayaram 

Zanaboni Theorem Is Not True

Zanaboni  Theorem  Is  Not  True

Pipeline modelling by Abaqus

I am new to Abaqus, I need assistant on modelling of pipeline.

Dynamic Modeling for Viscoelastic material using ANSYS

Hello,

I am planing to model a viscolestic material in ANSYS and condition is dynamic.

Could anyone please suggest what are the essential things (i mean datas) required for modeling a viscoelastic material?

For example, If I do the DMA test of viscoelastic materials i can have the modulus data at different frequencies. How to use those data in ANSYS to find out the stress-strain curve?

Thnaks for your kind help

parimal maity

GEOMETRIC NON LINEAR ANALYSIS WITH MATLAB

Choose a channel featured in the header of iMechanica: 

Dear professors

 Could you please help me to get an MATLAB code for non linear analysis of simply supported beams please.

Email me on; kazitani_nabil@yahoo.fr

Best regards

Modeling Impact on ANSYS-AUTODYN

Choose a channel featured in the header of iMechanica: 

 

Normal
0

false
false
false

EN-US
X-NONE
AR-SA

MicrosoftInternetExplorer4

zero thickness cohesive zone with curvature (update)

Choose a channel featured in the header of iMechanica: 

Hi everyone:
   I am henry, a graduate student in USA. These days, I am trying to make a zero thickness cohesive zone with curvature. After I define this and get everyting set up, then submit the job, the warning windows pop out and tell me the following error messages:
The node numbering might not be correct for element 2010 instance cohesive-1
The node numbering might not be correct for element 2010 instance cohesive-1
The node numbering might not be correct for element 2029 instance cohesive-1

ennio curto's picture

More information about residual stress tester.

Choose a channel featured in the header of iMechanica: 

More information about residual stress tester.

ziyad's picture

For Geotechnics Abaqus Users!

Hello colleagues,

Iam trying to model load test on board pile. I have already a model which is working but not as I need. I think the interaction between pile and soil is not correctly defined. Has someone an experience with this issue.? How I should define the interaction between soil and pile?

Attached .inp file.

Regards

Ziyad

flong208's picture

For metals, when will the elastic modulus be changed?

I have a question, for the same metal material, when will the elastic modulus will be changed? in another words, in what kind of processing or machine condition will the elastic modulus be changed? for example, to machine elements(gear, bearing ...), when the part surface is case hardened,will the elastic modulus be changed? if not, how can the difference of hardness between case hardened surface and without hardened substrate be reflected in FEM analysis? how can the case hardened surface parameters affect the contact stress when two part are brought to contact?

Zero thickness cohesive zone with curvature

Choose a channel featured in the header of iMechanica: 

Hi everyone:
   I am henry, a graduate student in USA. These days, I am trying to make a zero thickness cohesive zone with curvature. After I define this and get everyting set up, then submit the job, the warning windows pop out and tell me the following error messages:
The node numbering might not be correct for element 2010 instance cohesive-1
The node numbering might not be correct for element 2010 instance cohesive-1
The node numbering might not be correct for element 2029 instance cohesive-1

Modeling of Droplet spreading

dear all

i am trying to model droplet impact and spreading and i am thinking of using comm code CFX for this purpose

Can CFX handle this sort of problem?  or if some one  can help me out with an alternate

thanks

Structures in fire

Hi,

Are there researchers working on specific areas in offshore structures? Or is anyone covering the material behaviour of structures at elevated temperatures? I am indeed challenged to read about excitng contributions from different scholars expecially in structural mechanics. I realise I have just begun a race in research. You could help me gain the proper direction in research.

I shall be glad to get any response. 

Emmanuel

problems in using traction-separation laws supplied by Abaqus

Choose a channel featured in the header of iMechanica: 

Abaqus supplies cohesive elements and several traction-separation laws
which can be used to study crack problems. In studying a mode I crack
problem (see Fig.1), the cohesive interfaces in front of the crack tips
(both sides) are represented by cohesive elements. The size of the bulk
material is taken as 6x6 mum and the size of cohesive elements is 2x2
nm (or 10x10 nm). The constitutive response in the cohesive element is
described by a triangle-type traction-separation law, where  maximum

Classic paper by Geoffrey Taylor

The classic problem  in the area of High velocity Impact by Taylor...

Rohith

Funding required

 

Funding required to execute number of Innovative projects of international value.

Enquiry about fracture mechanics simulation using ABAQUS

Hi,

I am very glad to be here.

I want to make some simulation work on the fracture mechanics of thin films. Because the LEEF model is used for bulk materials, I wonder whether it is reasonable to use in on thin films.

Are there some pannels in abaqus can do crack propagation work or some fracture mechanics?

I am a fresh man and look forward for your help.

 

Regards

Phenixlee

Modal Analysis of a tapered beam

Choose a channel featured in the header of iMechanica: 

Hello everyone

I need modeshapes for a tapered beam, so I am using Ansys. By going through the tutorials I found that a beam can be modeled by creating a line and meshing it using Beam elements and assigning real constants. How can I use the beam elements for a tapered beam where  the real constants are not constant. I tried to use tapered beam element but is of no use as it the created all elements of same real constants creating a profile similar to a hack saw. 

Can anyone please help me how to mesh a tapered beam.

 
Awaiting the reply....

Amit Pandey's picture

Change in Elastic Modulus with Plastic Deformation

Article on web

http://www.eng-tips.com/faqs.cfm?fid=1441

 

The physical basis of material
properties like Young's modulus can be understood by examining
materials on the atomic scale. There are two main things that influence
the value of the modulus:

1.)     The atomic microstructure
2.)     The interatomic bonds.

 So, what is the reason of change of elastic modulus with plastic deformation? Any References??

 

 

weibang's picture

Simple calculation, Interesting result -- van der Waal interaction of DWCNT

It is well known that the wall-to-wall interactions play a great part in the deformation of MWCNTs. At the first glance, I thought the pressures, duing to van der Waal interaction, on the inner tube and out tube should be proportional to their radii inversely, because this interaction is a kind of action and reaction. BUT actually it is not the case, as illuminated in our paper published in APL, although this two pressures are both functions of the radii, they are not inversely proportional to the radii. 

BoJing Zhu's picture

Can we creat a new kind of "boundary condition" to LBM for solve the mulpiple coupled fields problems

As we know, lattice boltzmann method is one method to solve the fluid problems. and the primary work to use this method is give the corrected "boundary conditon"__pressure conditions and velocity conditions.

To general problems, the PC and VC for 2D/3D problems has been obtained by some scientists(eg.D3Q19,D2q9 ...model).

But to the lowest scale problems, the "force" fields is complexed and the traditional PC/VC is not suit for this kind of problems.

My opinion:

A novel "multiscale stochastic finite element method" on solid mechanics

Research on multiscale stochastic modeling is becoming big. In this article "A Green-function-based multiscale method for uncertainty quantification of finite body random heterogeneous materials"  doi:10.1016/j.compstruc.2009.05.009 , one of the first multiscale stochastic methods is developed for solid mechanics applications.....    

Jeong-Yun Sun's picture

Inorganic islands on a highly stretchable polyimide substrate

For a flexible electronic device integrating inorganic materials on a polymer substrate, the polymer can deform substantially, but the inorganic materials usually fracture at small strains.  This paper describes an approach to make such a device highly stretchable.  A polyimide substrate is first coated with a thin layer of an elastomer, on top of which SiNx islands are fabricated.  When the substrate is stretched to a large strain, the SiNx islands remain intact.  Calculations confirm that the elastomer reduces the

Reg. Penetrations in a Contact Analysis Code

Choose a channel featured in the header of iMechanica: 

Hi,

 

I have developed a FORTRAN code to simulate the molding process of glass to make lenses. Hence, it involves a contact analysis between the glass and molds. The contact is modeled using the master and slave node concept and the mold is assumed to be rigid. For the application of this code, we are looking at highly precise dimensions to capture the curve of the mold on the glass after molding.

Pages

Subscribe to RSS - research

Recent comments

More comments

Syndicate

Subscribe to Syndicate