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Research Position Computational Fracture Mechanics

A research position is available at the Erich Schmid Institute of Materials Science of the Austrian Academy of Sciences in order to conduct a strategic project funded by the COMET-K2 Competence Center on Integrated Research in Materials, Processing and Product Engineering in Leoben.

What fatigue damage model do you suggest to use in numerical simulations?

I want to simulate fatigue damage of foams (like PVCs). What fatigue damage model do you suggest? What model is regularly used in Industry? is there any one who simulate fatigue damage in Abaqus? Any information is welcomed...  Thanks in advance

What fatigue damage model do you suggest to use in numerical simulations?

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I want to simulate fatigue damage of foams (like PVCs). What fatigue damage model do you suggest? What model is regularly used in Industry? is there anyone who simulate fatigue damage in Abaqus?Any information is welcomed... Thanks in advance

subroutine interface to visit nodal displacements in Abaqus

I wonder if there is any subroutine interface to have access to nodal ( not integral point ) displacement in abaqus DURING the analysis phase.  Suppose I have a field that is going to be used in UMAT and that is dependent on  displacements of all nodes (presumably stored in an array) from the last increment. Is this possible to be implemented within Abaqus?

Thank you all !

FEA Position at BD Working on the Next Generation of Medical Devices

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BD is one of the largest global medical technology companies in the world and is advancing the world of health by improving medical discovery, diagnostics, and the delivery of care. The BD Corporate CAE group, located near Raleigh, NC, is hiring an Engineer II focused on nonlinear structural mechanics, primarily using Abaqus.

dithoap's picture

2 POSTDOC posts on Computational Solid Mechanics (Delamination modeling) and Functional Nanocomposites/Wearable Electronics

The Division of Physical Sciences and Engineering at King Abdullah University of Science and
Technology (KAUST), Saudi Arabia, invites applications for Postdoctoral fellow in Mechanical
Engineering at the Composite and Heterogeneous Material Analysis and Simulation Laboratory
(COHMAS, http://cohmas.kaust.edu.sa).

2 field of studies are available:

User defined contact output (at contact pairs)

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Hi all,

ABAQUS - the influence of changing kinematic and cycling hardening parameters

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Hello,

 

I have recently done a simple hourglass model to check the influence of hardening parameters in Abaqus. The reason was the effects of the parameters' change in bigger models were a bit surprising, therefore I needed to investigate the reason using some simpler model. Please see file 1.

 

After performing tension/compression cycles I got results as shown in files 2, 3, 4 and 5. Please note that only the hardening parameter in the description changes, the other three stays the same for each series.

 

Problem with defining corner BC/constraint

Hello all,

I'm trying to model the buckling of a shell structure under thermal load.

The structure is square-shaped.

The left edge must be kept straight. To achieve that, I applied MPC Tie Constraint for its nodes.

The bottom edge must be fixed so that the BC applied at its nodes was U1 = U2 = U3 = 0.

Temperature is applied as a predefined field.

However, when I run the simulation the corner that connects both edges deforms very strangely which makes me question how to model it.

I appreciate any input. Thanks.

Lumped heat capacitance matrix and temperature oscillation.

Hi,

 

When I was reading the Abaqus manual about transient analysis in thermal field, I found a sentence that says 'In transient analyses using first-order elements the heat capacity terms are lumped, which eliminates such oscillations....' (Transient analysis in Abaqus Analysis User's Guide 6.5.3). 

I think that this 'oscillations' is related to not only explicit time integration, but also implicit time integration (such as Backward Euler method).

Piezoelectric Stack Modelling in ABAQUS

How does one model a piezoelectric stack Actuator in ABAQUS?

Abaqus User defined Routines

I have been using an Abaqus dll created using a user-defined routine. Things work well on a serial case. The issue comes when I try to use it in parallel. I am trying to do this on windows 7. The error I get is

forrtl: severe (59): list-directed I/O syntax error, unit 12,

in Fortran I/O but I do not get this error when I run the simulation serially. Any ideas will be helpful.

Thanks

 

Abaqus Python : reading odb file for field frame data

Hi,

I am running a python script to do some post processing on Abaqus odb file. While running it on Abaqus/Explicite output file I found it was taking more than usual time. And after timing the run I got the surprise that the most time consuming thing what just to read the time value for each frame. I have the script below.

def main():

odb=openOdb('F:/Scripting/.../.../Example.odb') 

Emilio Martínez Pañeda's picture

New release of Abaqus2Matlab: GUI, reading .odb and much more!

A2M GUI interface 

Dear imechanicians,

A new version of Abaqus2Matlab has just been released and I hope that it is of interest to you.

This new release constitutes a very significant step forward in the development of this well-known software to connect Abaqus and Matlab.

Question reg ABAQUS-VUMAT and Updated Lagrangian formulation.

Hello all,

I am working on implementing a viscoelastic constitutive model from a hyperelastic stored energy potential (for finite-elasticity) and a dissipation potential (for the viscouls evolution). The elastic constitutive relation, hence derived from the stored energy potential is rate-independent and it is expressed as T(Cauchy's Stress) = f(B), where B is the Left-cauchy green deformation tensor.

The evolution equation is derived out in an objective rate form, which I am integrating over time using a 2nd order accurate explicit method.

My question:

User-defined amplitudeS using UAMP subroutine in ABAQUS

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Dear all,

I need to use two user-defined amplitudes in my model in order to apply two separate variable-dependent forces on two separate partitions. I have been struggling with this for long now, and the documentation says "There is one exception in Abaqus/Standard: only one solution-dependent amplitude (used for superplastic forming) can be active during each step."

I see the possibility of defining multiple solution-dependent amplitudes in CAE, but in UAMP the variables such as ampValueOld, ampValueNew, etc. may take only one value. 

Frank Richter's picture

Bone remodeling: Komarova model

Dear Community,

I make a code public for bone remodeling, using the Komarova model. It was developed by me alone. I provide the code as is, without warranty.

The agreement between my data and the ones from a reference are very good for fixed loading, but deviate for a more intricate loading. Lacking access to Abaqus with a Fortran compiler, I am at present unable to pinpoint the cause for the discrepancy between my data and data from the reference. The code can serve as a starting point and I give directions how to identify the cause for that discrepancy.

Abaqus element surface.

Dear all,

I'm using abaqus to build a spherical model, which applies C3D8 linear brick element.  I output the connectivities of one element on the surface and the corresponding coordinates. 

For a linear brick element, the four nodes A,B,C and D on the same surface should lie on the same plane.  However, I got two different normals which are from A,B,C as well as A,B,D.

Is it reasonable or do I misunderstand something?

 

Best

rajan_prithivi's picture

How does abaqus calculate deformation gradient in presence of thermal expansion

When we only have mechanical loading, I understand that abaqus calculates the total deformation gradient using F = I + partial_U/partial_X and U = N_i*U_i where U_i is the displacement at the nodes  and N is the shape function .

If I use a thermal expansion in addition to mechanical loading , Does abaqus give the total deformation gradient incorporating both mechanical loading and  thermal expansion ?
F = I + partial_Utot/partial_X ; Utot = U_mechanical + U_thermal

Frank Richter's picture

reflection and transmission coefficients in long elastic bars

 

Dear iMechanica Community,

I'd like to ask for advice on modelling reflection and transmission coefficients when two bars with different cross-sectional areas contact each other and are exposed to pulse loading.

I have modelled this process in Abaqus/Explicit as a two-dimensional simulation. The investigation was conveniently done as a parametric study, defining the lateral dimension as parameter. Both bars are slim (length 2 m, diameter 2 cm) and elastic.

CFD simulation

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How to simulate air flow over 3d curved solids using Abaqus? I saw a conventional aerofoil model in youtube. Anything more general?

How to plot path length over time in Abaqus?

Dear Abaqus users,

I intend to plot the true distance of a path over all the steps of my simulation. 

One way is to create xy-data of an arbitrary output field over the true distance of the path, for each step.  Do you have any suggestion how I can get (true distance vs time) straightforwardly and faster?  

Thank you for your time and consideration 

 

Best regards,

jferreira

 

Identifying fracture energy in ductile damage in ABAQUS

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Hello,

I am trying to find out how to identify specified parameters of ductile damage material in its stress-strain curve in Abaqus. I created a one-element model with a dimension of 1x0.2x1 (0.2 in y-direction) and simulated a tensile test in y-direction with a displacement condition of 0.02mm.

ABAQUS UMAT CPFEM Subroutine

Dear All, 

We are working on Equal Channel Angular Pressing (ECAP) project and we are trying to implement CPFEM with Abaqus UMAT, there are few examples online but we could not able to run them on abaqus 6.13 with any subroutine. Does anyone have any working subroutines on related subject?

Kind Regards

 

Yunus Emre Kulhan

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