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good morning,
im PHD student in france working in stent problems,
i want to simulate only superelastic model of nitinol in ABAQUS (   
Auricchio's model)
some doc are available in th internet, but still confused

how can i idintify this material in Abaqus?
do i have to code this model and write subtoutine in fotran  or it 
already exists in ABAQUS ?
what is in summery  the steps that i have to do??
thanks 4 giving some of ur time 4 this question
ALTNJI.
BEST REGARDS.

Good afternoon all,

Hello,

I want to do modal analysis of a structure with viscoelastic material. The viscoelastic
material has a complex youngs modulus E= E (1+i*g), where g is the loss factor. In ANSYS, modal analysis ignores all
nonlinearity, so how can I perform modal analysis with viscoelastic material?

OR

HI all,

sorry my bad english,anyone could help me?

I' am a begining in abaqus, why the data in abaqus viscoelastic model are entry with shear test? and not with uniaxial test?

 How introduce they for polymers materials?
 
 thank you

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AR-SA

Dear All:

I completed calculating my stress-intensity factors by  modifying the verification test case  in ANSYS 

I need to calculate the J-plastic values for  Ramberg-Osgood type material using isotropic hardening for various n values . 

Does ANSYS have a Ramberg-osgood material model built in ?

Advances in molecular assembly are converging to an ultimate in atomistic precision —nanostructures built by single atoms. Recent experimental studies confirm that single chains of carbon atoms —carbyne— exist in stable polyyne structures and can be synthesized, representing the minimal possible nanowire. Here we report the mechanical properties of carbyne obtained by first-principles–based ReaxFF molecular simulation. A peak Young’s modulus of 288GPa is found with linear stiffnesses ranging from 64.6–5 N/m for lengths of 5–64  ̊A.

Hi All,

 I am a PhD student working with anisotropic elasticity to model T-stress. I understand the simplicity of derivation in Stroh formalism but am lost in the Matrix algebra whereas Lekhnitskii provides complex derivation for the formulation but on first glance, it seems more user friendly for numerical modelling.

 Does someone have an experience in modelling the either one formalisms with MATLAB and could he share his experience?

 Thanks for the sharing of information.

Dear Colleagues,

I would be glad to present symbolic-numeric CAE system for frame structures analysis.

It will be available soon as Preview version for enthusiasts

The main features are:

Dear friends

I am modeling a
plate subjected to the vertical loading. the problem is, when the analysis goes
to the nonlinear part, the reactions in some nodes get negative value, while the
plate must be free to move upwards. so there must be no negative value
for reaction. i was wondering, if someone help me define the support in a way
that the plate would be free to move upward and constrain it for the downward
movwement.

Best Regards

Dear All,

I
faced problem in modeling Reinforced Concrete Beam considering discrete
reinforcement. Its a 10'X12"X6" sized beam reinforced with 2-10mm long
bar. I first model the concrete volume, mesh it & then create link
elements individually. The model shows ultimate load, deflection, mid
span stress very much close to theoretical values. But the problem is:
it doesn't show any crack/crush in concrete. I tried to get it, but
failed.

Hi all

I am M.Sc. sutdent in Istanbul Technical University and my research subject is comparision of several ductile damage models both computationaly and experimentally.

I am trying to compare ductile damage models such as Freudenthal,Cockroft,Ayada ,Brozzo etc. computationally using ABAQUS and seeking a way to implement these damage models in ABAQUS.

To obtain each models damage result individually should damage model be implemented in ABAQUS or  can a regular tensile test results be used for calculation of damage values.

Could you please advise me for methodolgy to run a simulation to obtain ductile damage values accordng to models mentioned above.

Thanks in advance for your help.

Hakkı ISIK.

Hi,

I'm conducting hypoplastic VUMAT model in abaqus. It always has the following problem. 

***ERROR: Bad Material definition in element number 1: zero or negative
initial dilatational modulus caused by bad material data. Please
check your material input and any initial conditions if necessary.