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Using VGETVRM to compute strain in VUSDFLD ( abaqus explicit subroutine)

Submitted by arash_n on
research
metal forming

hi everybody.

I've used vgetvrm in vusdfld to calculate strain.

I have two question.



1- what's the differences between tensor strain and engineering strain?

I read user subroutine manual and it says"The shear strain components returned from utility subroutine VGETVRM are tensor components and not engineering components."



2-I want to calculate PE11 and PE22 with vgetvrm. but my results are strange.for example PE11 change between -11.14033 and 75.25797.

and PE22 change between -1.5974975E-04 and 4.7500171E-03

Graduate Student Researcher Position in Biomedical Device Development Research Seeking Ph.D. Degrees

Submitted by yjchun on
job

The BioManufacturing and Vascular Device Laboratory at the University of Pittsburgh seeks a dedicated Graduate Student Researcher, interested in developing novel manufacturing processes and realizing advanced biomedical devices (http://www.pitt.edu/~yjchun/home.html). 



abaqus superelastic ( Auricchio's model)

Submitted by samo on
superelastic

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.

Hysteretic damping in modal analysis using ANSYS

Submitted by saeed_11 on
research
ansys
Modal Analysis
Hysteretic damping

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

How can I perform modal analysis in ANSYS considering hysteretic damping (complex Young’s
modulus  E= E (1+i*g) as input).


Cheers

 

J Plastic Calculation

Submitted by nsanteb on
research
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 ?

The minimal nanowire

Submitted by lamm on
research
Mechanical properties of nanoscale systems

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.

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