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Brain drop simulation

Submitted by mihir01 on
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Biomechanics Forum
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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.

Modeling contact in ABAqus

Submitted by ahkulkar on
research
ABAQUS

i am working on modeling hertzian contact (general and standard conact in abaqus). i want to know how to model contact between surfaces of my assembly.  i modeled it but it gives me error saying that my regions in the model are not connected.

How should I go about? is contact modeling different than just constraining the surfaces ? 

"bending stress-strain curve" or "compression stress-strain curve"?

Submitted by mahmood seraji on
research

Hi 

I want to model the lightweight slab and since i do not have the material behaviour of the slab, i have to do testing. i was searching in internet and i got two different concept: "bending stress-strain curve" and "compression stress-strain curve". i do not know which one should i follow? and is there any difference?

Regards.

puzzle in the asymmetric four-point-bend sepcimens.

Submitted by pflines on
research
fracture toughness
mode II fracture toughness

HI, everyone,

 This is pflines, i am working on the mode I\II fracture toughness.

i want to use the asymmetric four-point-bend sepcimens to get the value of KI and KII,

 but did not found a clear formulation to caculate the KI and KII,

 anyone could help me?

convergence difficulty due to the stiffness degradation in Abaqus

Submitted by morteza roostaei on
research

Hello everybody

I am simulating hydraulic fracturing operation with Abaqus. I have used cohesive elements and also utilized viscous regularization to cope with convergence difficulty. However, the problem still persists. Should I stick to regularization technique or should I write a user subroutine that will allow more flexibility. 

  Thank you

Fracture of electrodes in lithium-ion batteries caused by fast charging

Submitted by Kejie Zhao on
research
fracture
suo group research
lithium-ion battery

During charging or discharging of a lithium-ion battery, lithium is extracted from one electrode and inserted into the other.  This extraction-insertion reaction causes the electrodes to deform.  An electrode is often composed of small active particles in a matrix.  If the battery is charged at a rate faster than lithium can homogenize in an active particle by diffusion, the inhomogeneous distribution of lithium results in stresses that may cause the particle to fracture.  The distributions of lithium and stress in a LiCoO2 particle are calculated.  The e

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