ABAQUS

Hi all,

         Recently  i tried  Hydrostatic pressure stress element removal criterion in Abaqus(19.2.8 Dynamic failure models in the 6.9 manual) . I used 75 Mpa as cut-off pressure stress and after which the material fails. During post - processing i tried to measure the pressure stress in an element that failed but the element did not fail at 75 Mpa and i checked few other elements, also i found the same thing none of them failed at 75 Mpa. What could be the possible reason? 

Thanks

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Hello,

I want to know that is there a novel way of defining several two dimensional contact pairs in Abaqus/Explicit. I know that abaqus has the capability of defining a general contact but it is restricted only to Abaqus standard and 3D Abaqus explicit problems. 

I have a 2D plane strain problem where I have to specify more than 1000 contact pairs in the assembly between similar instances of the same part. Is there a fortran subroutine that could be used to determine so many contact pairs?

Thanks,

Tuhin

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Hi all,

I have been trying to gain an understanding of representing a viscoelastic material in abaqus. To do this i have been trying to represent polypropylene using data obtained from creep curves found in literature (attached). To now what i have been doing is the following: Note i am using Abaqus 6.7

In material manager: selecting Elastic-inputting Instantaneous Youngs Modulus, E, Poissons, v, (E=1.8GPa, v=0.4) and setting the moduli time scale to instantaneous. And Viscoelastic-Domain:Time, Time=Creep Test data and inputting Shear Test Data

Hello,

I'd like to ask if anybody knows if it is possible to use an ABAQUS usersubroutine that could vary some parameters (τmax, kn or ks etc) of the cohesive zone model of ABAQUS with the vertical pressure applied on the interface. The new ability of ABAQUS to support cohesive behaviour in contact surfaces seems very interesting and useful, however how could somebody simulate the interface under a compression - shear regime that may follow a Mohr-Coulomb type behaviour?

I am working on shear failure of sandwich composites.I have modelled a sandwich composite with surface based cohesive behavior in ABAQUS 6.9.Now i have to do damage modelling.

Hi,

I would like to model a microstructure using Abaqus. My question is how to deal with the grain boundaries ? Should I use cohesive elements ? Any ideas on modeling grain boundaries using FEM will be very helpfull.

Thanks,

Ayoub

Dear Group,

does anyone know how section points can be defined in user-defined elements UEL ?

I am trying to program my own beam element in ABAQUS. The beam element library does not provide a beam element with temperature as a degree of freedom which would come as an asset in our application.

Beam elements feature so-called section that provide the spatial resolution through the thickness. I cannot find any clue how this can be programmed. ABAQUS standard elements give results for strain, stress and the like at these section points.

Hi, friends,

Now, I am implementing the non-local continuum theory in ABAQUS through UMAT programming.

Unfortunately, I have been obstacled by the following question:

On one hand, in non-local continuum theory, the non-local strain of every particular integration point is determined by the global strain field all over the specimen.

Dear all,

   I will model a bird to impact a shell at high velocity by ABAQUS.  I decide to model the "bird" by ALE mesh and referred by EOS equation.

   However, most simulation works are done by LS-Dyna. Do anyone know how to determine the parameters in ABAQUS for the "bird" in EOS equation?

   All suggestions are welcome.

   Thanks.

Jason,

Best regards 

Hi there,

would you please tell me how can I use or calculate the effective strain rate or strain rate in ABAQUS subrotine?

 thank you!

Hi all,

 I am currently working on my Masters thesis which is the analysis of sandwich structures subjected to blast loading using Abaqus. Can someone suggest some references which would  explain me how to apply blast loading using abaqus. 

There is an example problem of submarine in the abaqus user's manual which includes the blast loading. But they've only given the inp file for that. 

So can someone also tell me how to generate .cae file from .inp file in abaqus.

Best Regards,