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Static Load in ABAQUS Explicit

Hello,

I have to do a simulation with two loads, a constant static load and a dynamic load that rapidly decreases. What is the best way to handle this? Should I create two steps one for the static load and one for the dynamic load and let the static load propagate, or should I just have one step where the static loas acts instantly and the dynamic follows an aplitude?

The problem with the two step idea is that when I create the static load as static, I cannot get the choice of Dynamic/Explicit on the creation of the next step.

Any ideas

How to define the contact state if the corresponding cohesive element is under compression (ABAQUS)

Hi. I am currently using cohesive element traction-separation law for modeling interface element between FRP and concrete. Can any one tell me how to define the contact state if the corresponding cohesive element is under compression in ABAQUS?   Yes, it's said that there won't be any damage if pure compression is applied to cohesive element, but my questions is how to consist of assuming that friction occurs on the damaged part as there is no friction definition in cohesive traction-separation law.   Please add comments if you know something about this. Thanks for help ^_^

montero's picture

ABAQUS - Problem concerning "concrete damaged plasticity" model

Hi all,

I'm trying to solve a frame structure in ABAQUS. I'm using 3D beam elements (B31) so that shear and bending stresses may appear. This is ok for an elastic analysis, but I also want to perform a failure analysis of this frame. Therefore, I'm trying to use the "concrete damaged plasticity" material in ABAQUS.  But I've read in the manual I can't use B31 elements with this material.

 Does anyone know how to combine the "concrete damaged plasticity" material in a 3D beam analysis? Any other suggestions?

montero's picture

ABAQUS - Problem concerning "concrete damaged plasticity" model

Hi all,

I'm trying to solve a frame structure in ABAQUS. I'm using 3D beam elements (B31) so that shear and bending stresses may appear. This is ok for an elastic analysis, but I also want to perform a failure analysis of this frame. Therefore, I'm trying to use the "concrete damaged plasticity" material in ABAQUS.  But I've read in the manual I can't use B31 elements with this material.

 Does anyone know how to combine the "concrete damaged plasticity" material in a 3D beam analysis? Any other suggestions?

Surface Based Fluid Cavities, and inflators

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I've been tasked with creating a 3D model of a demo inflatable
structure here in our lab. The goal is to inflate it in ABAQUS, and I
have been making some progress in using the *FLUID CAVITY keyword.
However I'm noticing odd things in my results. I have the pressure of
the gas increase to 4psi in a tabular form, however as I watch the
frame by frame, the stress concentrations on the structure vary oddly,
and the model deforms oddly. Almost as if it was a ball being pressed
back and forth against the floor, expand contract, that kind of deal.

Mohr-Coulomb Shell in Abaqus. Help!

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Hi,

I am new to Abaqus and I am trying to use it to model some industrial shells. According to some preliminar studies, the material has a mohr-coulomb plastic behaviour. Thus, I wanted to use shell elements, with a mohr-coulomb plastic material, but it seems that it is not possible in Abaqus.

According to the theoretical manual and the user manual (18.3.3-6):

ziyad's picture

For Geotechnics Abaqus Users!

Hello colleagues,

Iam trying to model load test on board pile. I have already a model which is working but not as I need. I think the interaction between pile and soil is not correctly defined. Has someone an experience with this issue.? How I should define the interaction between soil and pile?

Attached .inp file.

Regards

Ziyad

TungPhan's picture

Abaqus 6.9

Hi all,

 

Please could  anyone help me for this?

How to link Abaqus CAE with UMAT subroutine? When I run simulation, it announced that 

"Error in job tensile: Problem during linking - Abaqus/Standard User Subroutines.   This error may be due to a mismatch in the Abaqus user subroutine arguments.   These arguments sometimes change from release to release, so user subroutines   used with a previous release of Abaqus may need to be adjusted.
Job tensile aborted due to errors."

Thanks for your helps

 

anilathampy's picture

How to rectify an Element error in Abaqus?

 

 

when trying to submit a model for analysis i recieve an error as follows

 

1200 elements have missing property definitions. The elements have been identified in element set ErrElemMissingSection.
Error in job 4: Analysis Input File Processor exited with an error.
Job 4 aborted due to errors.

 

I have defined the material and then seeded it and defined the element before meshing it.I have also tried defining the element before defining the material and still get the same error.

 

jin haeng Lee's picture

Problem of contact data in ABAQUS 6.8 version

Hi.

I have an issue related to recent change in ABAQUS new version.

 I've recently found a problem related to cotact data in ABAQUS new version, 6.8. I use fil files, but I've heard from a Simulia engineer that data file also has the same problem (I have not checked it out yet.)

Johnson-Cook Material Model, Abaqus Explicit

I am currently running a Quasi-Static compression simulation in Abaqus Explicit using the Johnson-Cook Plasticity option. As the strain gets beyond the elastic range, the stress-strain response begins to oscillate +- 5 MPa around the expected curve. Does anyone know why this is happening and/or how to repair the problem?

Thanks, 

D. Barrett Hardin

ABAQUS question on multi-core processor.

Hi, all imechanicans,

I use ABAQUS 6.8-1 on REDHAT 64-bit which is recent version. My server has two quad-core processors. Even though I select 8 cpus to run the model I made, only two or three cpus are work, not 8 cpus. Why does it happen? Does anybody know about this?

My model is 2-D and has 1000 eight-node elements.

Thank you

ziyad's picture

Modelling of load test on board pile by Abaqus

Hi all,
has someone experience with modelling soils in Abaqus? I am trying to model load test on board pile, some errors apear, like so many attempts made for this increment...too large fixed time, etc. I am pleased to share .inp file of analysis.
Ziyad

Abaqus 3D model and 2D meshed cross-sections

I have a 3D model in Abaqus of a wind turbine rotor, modelled with shell elements (S4R and S3). To use the same blade in an aeroelastic wind turbine code (HAWC2 from Risoe), I want to convert selected cross sections of the 3D model to Timoshenko beam elements.

Coupling Abaqus with an aeroedynamic code - PART 2

In a previous post some months ago (see here), I mentioned some of the questions I had considering the aeroelastic response of a wind turbine rotor. In this post I just want to give, for those interested, a brief status report.

ABAQUS/Standard - 2D beam elements vs 3D shell elements

Dear collegues,

I am modeling deformation of a simple triangular shape, /\, which is constrained at one end and the other end is free to move on the x direction. There is a displacement loading on the top corner and the output is the reaction force on the y direction at the free end.

 I used Abaqus/ Standard and modeled this problem in 2D beam elements and 3D shell elements. The material is aluminum with plasticity and nonlinear geometry is on. 

Compressive Strength of Fabric??

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I am trying to model a rubber impregnated fabric as rebar in Abaqus Standard. It seems that the rebar is only good in uniaxial tension load and it causes convergence problem in bending and compression loading. The fabric and rubber matrix has a compressive strength and that is critical to the model that I am analyzing. What would be a good approach to include compression on fabric rebar? The compressive strength of fabric matrix should be an order of magnitude lower than the tensile strength but I do not have a test data in compressive loading.

hua_2001's picture

how to show the stress in the thickness direction when you use the shell element with abaqus

hello,

  •      i simulate some process using shell elment, i find the results have big difference between abaqus and lsdyna. the abaqus results always show the stress in the thickness direction is zero. but the lsdyna is not. i don't know why? if some one know that, please give me some suggestions. i heard that the abaqus can not show that stress component. if not, how can i do to calculate that and fill it into the results file (.fil file). thank you!

 

Beginner with abaqus.. need help modelling an impact load

Hi,

Im really quite new to using abaqus and I am having trouble with my modelling.  Esentially it is quite an easy problem but my knowledge of the programme is limitted.  Basically all I want to model is an impact load on a wall but im not sure about the analysis steps.  Initially i have been using a static step with a concentrated load but I dont know how to model the dynamic response the wall should experience after the load has been applied.

If anyone can help with this I would appreciate it a lot.

About the half-step residual tolerance in Abaqus

    This days, I am working on the dynamics analysis using the Abaqus. the implicit dynamic integration method in abaqus is HHT-alpha. I found that a very strange parameter about the method is the half-step residual tolerance . I don't know the parameter is whether important or not and how to determine it.

thank you very much :)

How to Compute MATERIAL JACOBIAN?

Free Tags: 

Hi All,

 Thanks for your help so far. I have one last question to the forum. Please do answer whatever you know. How can I compute Material Jacobian for my UMAT subroutine? 

best regards

--dinesh

Gouse's picture

Probelm with Abaqus/Explicit

Hi,

I am using cohesive elements to model the interface around a
circular inclusion. First I used Abaqus/standard I got proper results
but when I used same values with an amplitude curve (tabular, linearly
applied) to apply load quasi-statically in Abaqus/Explicit, I could not get a converged
solution. Field variables are oscillating and elements getting
distorted excessively. In Abaqus/Explicit I am applying load very
slowly but even though same problem persists.

Regards

Gouse 

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