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defining a time dependent elastic modulus

Submitted by gna on
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Hi,

I'm working on a model with Abaqus and I face a problem. One of my materials has an elastic modulus which isn't constant according to time. As I search I found out that this should be done by USDFLD subroutine. I'm not familiar with subroutins and how to write them and all the resourses that I've found just confused me more. I would be grateful if someone helps me.....

GIAN course on Multiscale Methods in Mechanics

Submitted by Stephane Bordas on
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course notes
xfem
IGA
meshless
error estimation
IGABEM
fracture

Presentation given as supporting slides for the course at IIT Madras

http://hdl.handle.net/10993/27979

http://orbilu.uni.lu/bitstream/10993/27979/4/20160524_IIT_Madras_GIAN_S…

http://orbilu.uni.lu/bitstream/10993/27979/1/20160524_IIT_Madras_GIAN_S…

Yours,

Stéphane Bordas

Invitation to Hybrid Films to Human Skin: The Relationship between Structure, Processing and Function

Submitted by hashina on
education

 

Dear All,

 

I would like to invite fellow bloggers in Singapore to a Singapore University of Technology and Design (SUTD) Engineering Product Development (EPD) Lecture Series talk titled: 

Hybrid Films to Human Skin: The Relationship between Structure, Processing and Function

presented by Professor Reinhold H. Dauskardt (Stanford University), on Tue, 12 July 2016, 3:00pm – 4:00pm Singapore Time, SUTD Lecture Theatre 1 (1.102).
  

For more information, please refer to the attached flyer.

Newton Raphson for FEM

Submitted by AnnaK on
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Computational Mechanics Forum
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FEM
Newton Raphson
tangent matrix

Hi,

I am currently working on a FEM  2d plane strain elastic model in matlab. The next step would be to use a non linear constiutive law (Mohr-Coulomb). As far as I have been reading non linearities, are solved with iteration schemes. My question is how to compute the tangent matrix with the N.Raphson method? I have seen only case for polynomials, but not for matrices.

Regards!

Anna

Large Deformation - Definition of total work energy density

Submitted by rajan_prithivi on
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large deformation
energy density
Computational Plasticity
continuum mechanics

Like we have the elastic strain energy density for small deformations  defined as 0.5* σ :e  .

Is the equation PK2:E valid for the total work energy density for elastoplastic regimes ? If not, what would be a valid equation for total energy density ?

How can we decompose total work density into elastic work and plastic work densities for a large deformation case.

Where,

PK2 is the second piola kirchoff stress tensor

E is the Green-Lagrange strain tensor

 

Thanks,

Prithivi

 

 

Plane_Stress, Plane_Strain and 3D - Simple doubt..

Submitted by shreeram111 on
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applied mechanics
FEA
plane stress
plane strain
model simplification

Hello everybody,

 UPDATE :   Question can be deemed as closed.. :)

                       I have a very simple doubt in 3D model simplification. I believe plane stress and plane strain conditions are the two extreme states to simplify a 3D model to 2D case.

Transfroming applied tractions into statically equivalent nodal force BC

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Hello,

I am trying to produce results for problems with analytical solution to validate my FE code. One of the problmes is the classical plate with a hole configuration with tractions applied at boundaries. However, presently, I can only impose BC in terms of nodal forces and displacements. Therefore I must transform the applied stress in statically equivalent nodal forces.

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