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CONSTANT Velocity Gradient

Submitted by John Craighead on

I'm hoping that someone can share the physical significance (i.e. type of motion) resulting when the (spatial) velcity gradient L is constant. I'm not certain if L constant wrt to only position or also time. Gurtin (The Mechanics & Thermodynamics of Continua, pp. 107-08) uses this assumption to develop the motion equation given below.

questions about abaqus software package

Submitted by Loay-kh on
research

Hello

I was analyzing pavement subjected to traffic wheel load. I was using the load as cyclic pressure. Suppose an amount of pressure with 200 different time frame. But I am not getting the right result as measured. So, would you please help on applying moving load? How can I assigned that load as moving load? where can I find the step load function? how can I determine the initial increment? is it more realistic to simulate the wheel load as dynamic? how can I do that?

Thanks a lot.

 

 Best regards,

Loay

Constructing the extension velocity or updating the signed distance of a level set

Submitted by Mikael Öhman on
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Computational Mechanics Forum
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level set methods
distance functions
free surface flow

Dear all,
I had been looking forward to use level sets to keep track of the surface in a simulation, but one thing has me stumped. Since many here work with XFEM, I was hoping someone might have some valuable input.

I want to simulate flows driven by a surface tension. This will typically yield holes, which will close rapidly. At the point at which the hole disappears, the signed distance function will have a discontinuity.
I would expect this to happen in pretty much any fluid simulation, but I can't see any way to handle it.

boundary condition in plate analysis

Submitted by M.Hassan Mansouri on
research

Dear All

 I have a problem with some theories in plate analysis such as bending and buckling of plates.

 you know that in various theories of plates, equations have different order and different number of boundary condiotions must be apply. for example in classisal theory of plates we have 4 B.C.,  and in first order shear deformation theory the number of B.C. are 5.

I am confused, how should I recognize the number of required B.C. in each theory?

 

Regards

Mansouri

Finite element modelling

Submitted by parisa on
education

Hi,

I am modellling a beam with a  hole in ABAQUS and runs pretty well. Now I would like to model a small area of the beam.

For an example the rectangular area which has been shown in the attachment file. When I model it What should I put as a boundry

conditions ?. I know that you may say that reactions of the beam (namely, Moment, shear, axial force) but I would like to just

investigate this part under pure bending and shear. What should I do? 

A model without  support is unstable ????

analysis for large deflection

Submitted by hany_333 on
research
ansys

hello all,

i modeled a cantilever column with eccentric loading to simulate half of ordinary column, i get a small displacement at cantilever tip (equals 1/3 of reality,) so i want ahelp a bout updating geometry during analysis in order to getting effect of second order/nonlinear effects due to eccentric load.

thanks for all,

Extracting Load proportionality factor from odb file in ABAQUS using python script

Submitted by ssha6693 on

Dear firends,

I run some abaqus input files and got my odb files(for example 100 odb files in a specific folder with the name of try). I want to extract LPF (load proportionality factor for whole model) using python script (In my analysis I used static riks). I used the following commands but when I run my script I get an error :

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