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FROTRAN subrountines for ABAQUS in bone remodeling simulation

Submitted by Lilia Wang on
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User subroutines in ABAQUS
bone adaption
remodeling simulation
FROTRAN

I'm new in the computer simulation of adaptive bone remodeling (Bone will adapt to the loads it is placed under). And I know many research cases of numerical model were implemented as FROTRAN subrountines for the software package ABAQUS: the bone material properties will be updated by the subroutine.

I know FROTRAN is excellent at handling large data sets for scientific coumputing and requires less resources, but I haven't learned the FROTRAN.I wonder what else irreplacable advantages of FROTRAN in the bone remodeling?

Breast simulation: Deformation Map

Submitted by prabhjot.juneja on
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ABAQUS
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Breast imaging
deformation map

Hi,

I want to simulate the deformation of breast under gravity. I
initially have patient's breast images in one position (supine, with
breast falling on the chest). I want to apply gravity loading and
simulate breast image in another position (prone, with breast falling
away from the chest).

I follow the standard path i.e. segment images (supine data),
generate mesh, import the mesh into ABAQUS, apply material properties,
BCs and loads and run the simulation and I get deformed breast mesh
(simulated prone).

Tissue strain-rate independence

Submitted by Vikas_ on
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impact
tendon
soft tissue
crash
ligament
anisotropic hyperelastic
strain energy function
high strain-rate

I have two basic questions for the experts in the soft tissue biomechanics community. 

a) I am interested in the biomechanics of a specific tendon in a specific high-speed deformation. How plausible is it for me to assume strain-rate independence, and therefore, the existence of a strain energy function? In other words, how accurate is the assumption of pseudoelasticity for tendons under high strain-rate? I feel comfortable with the assumption (evidence would help a lot, however) for tissues such as mesentery, skin and, I guess, even muscle. 

visoelastic parameter in Abaqus

Submitted by qiangbo on
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Biomechanics Forum

Hi,

I am trying to input the parameters for a viscoelastic material. I have the complex shear modulus [GS(ω) and GL(ω)] of the material within a certain frequency range. How do I derive the I(g*), R(g*) and G∞ that are required for Abaqus to work?

From the Abaqus manual:

R(g*) = GL(ω)/(ωG∞)

I(g*) =  [G∞ - GS(ω)]/(ωG∞)

However, the question is G∞ is a another unknown, how do I derive it?

Thanks a lot!

 

Bo

hi all

Submitted by V.A.Joneidi on
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Biomechanics Forum

I'm working on blood vessels constitutive equations and i need some papers but i can't find them

i hope if you can send them to me

here is my mail: vahab.ahmadi.joneidi [at] gmail.com (vahab[dot]ahmadi[dot]joneidi[at]gmail[dot]com)

in need these papers:

 1-  Lee, E.H. : Elastic Plastic deformation at finite strains.Trans. asme, J .applied mechnics 36, 1_6(1969)

Brain drop simulation

Submitted by mihir01 on
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ABAQUS
brain
skull
drop

I am doing research involving the finite element modeling of a human head namely Scalp, Skull, Brain & Duramater using Abaqus/CAE. I have finished modeling the parts, assigning the material properties, assembling and meshing the said model. I need to drop the whole assembly onto a 'floor'. What step should I choose. Also what interaction would I have to create so that the head would shear when it is dropped a distance less than 1 cm. Also bear in mind that it should not bounce.

 Thank you.

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