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  1. GPapazafeiropoulos

    ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT

    This error comes for various reasons. Here are some of the most often: 1) Failure has occurred in your model 2) There are overconstrained DOFs in your model which the equilibrium algorithm cannot handle successfully 3) Not sufficiently refined mesh, especially in contact regions 4) Incorrect...
  2. GPapazafeiropoulos

    Newton optimization algorithm made 10x faster. From necessity to reality.

    This post was created in order to obtain some feedback for the publication mentioned. If there is a problem with this I can delete it of course.
  3. GPapazafeiropoulos

    Newton optimization algorithm made 10x faster. From necessity to reality.

    A new optimization concept is introduced which involves the gradient-based optimization of any nonlinear structure by using gradients calculated from a linear equivalent, leading thus to significant computational savings compared to the classical Newton-type optimization algorithms which require...
  4. GPapazafeiropoulos

    Extract the data from a batch of analyses

    Dear Mcakir, You can try to extract these results from the corresponding fil files (if you do not have them already, then unfortunately you have to rerun the analyses in Abaqus by appropriate modifications of the input files). Check the Abaqus2Matlab toolbox for more information. A new version...
  5. GPapazafeiropoulos

    Abaqus exits with error when executed by Matlab script

    Hello Biomech_Max, I ran the input file input_error.inp in my workstation and everything went ok. It seems that the culprit is in the Python script that you use for the generation and execution of the input file. Instead of submitting the job directly, you can firstly write the input file by...
  6. GPapazafeiropoulos

    What would be the right way to model rigid body motion in FEM?

    Rigid bodies have infinite stiffness terms for the degrees of freedom which are attached to the rigid body and move with it and zero stiffness terms between the degrees of freedom moving with the body and the stationary degrees of freedom (fixed to the ground). Best regards, George...
  7. GPapazafeiropoulos

    Response spectrum analysis

    If the velocity pulse is provided as a function of time and your model is linear, then it would be more economical to perform response spectrum analysis. In this analysis: (1) You convert the velocity pulse from the time domain to the frequency domain using standard procedures which produce the...
  8. GPapazafeiropoulos

    addData abaqus script - VonMises FieldOutput

    Try the following code section instead of the one you have posted above. misesPM = frame.FieldOutput(name='MisesPM', description='VonMisesPM', type=SCALAR) elData = [] for v in S.values: if abs(v.maxPrincipal)<abs(v.minPrincipal): elData.append([v.mises]) else...
  9. GPapazafeiropoulos

    D' structure from D structure calculating.

    See the following example on how to automate the process: r.D_1= 79.3927; r.D_2= 141.8463; r.D_3= -126.6688; r.D_4= 167.2028; r.D_5= 547.2340; r.D_6= 10.5369; r.D_1_2= 98.8763; r.D_1_3= -140.9858; r.D_1_4= 95.0552; r.D_1_5= 458.3821; r.D_1_6= -48.7647; r.D_2_3= -107.6000; r.D_2_4= 170.8630...
  10. GPapazafeiropoulos

    Coupled temp-displacement

    Have you specified any displacement boundary conditions in your model? If yes, check that the center of the disk is fixed. Apart from this, you have to specify the displacement magnitude in Abaqus/Viewer to appear as a result, and not displacement U1, U2, or U3. Best regards, George...
  11. GPapazafeiropoulos

    Eigenvalue buckling due to horizontal load

    Provided that no material or geometric nonlinearities exist, the buckling load is a function of only the axial load of a member, and not any lateral load. This results from the definition of the geometric stiffness matrix. George Papazafeiropoulos
  12. GPapazafeiropoulos

    Transfer results from Abaqus to Matlab

    You mean that in future versions of Abaqus there will be no option for writing output in such files?
  13. GPapazafeiropoulos

    Transfer results from Abaqus to Matlab

    zwtipp05, the option you propose is another alternative, indeed. However in case one is not acquainted with Python, or cannot use it for various reasons, or is a beginner in Python (but much more familiar with Matlab), this toolbox offers another possibility to extract results from Abaqus to...
  14. GPapazafeiropoulos

    Transfer results from Abaqus to Matlab

    Dear all, A new submission has been made which aims to provide a link between Abaqus and Matlab. The submission has the form of a new toolbox (a zip file containing Matlab code, Abaqus code, and the relevant applications and examples). It occurs very often, that researchers have to resort to...
  15. GPapazafeiropoulos

    Transfer results from Abaqus to Matlab

    Dear all, A new submission has been made which aims to provide a link between Abaqus and Matlab. The submission has the form of a new toolbox (a zip file containing Matlab code, Abaqus code, and the relevant applications and examples). It occurs very often, that researchers have to resort to...
  16. GPapazafeiropoulos

    Transfer results from Abaqus to Matlab

    Dear all, A new submission has been made which aims to provide a link between Abaqus and Matlab. The submission has the form of a new toolbox (a zip file containing Matlab code, Abaqus code, and the relevant applications and examples). It occurs very often, that researchers have to resort to...
  17. GPapazafeiropoulos

    seismic wall pressures

    See this thread Best regards, _______________________________________________ George Papazafeiropoulos First Lieutenant, Infrastructure Engineer, Hellenic Air Force Civil Engineer, M.Sc., Ph.D. candidate, NTUA Email: gpapazafeiropoulos@yahoo.gr Website: http://users.ntua.gr/gpapazaf/
  18. GPapazafeiropoulos

    excessive distortion error in Abaqus

    There may be a very large contact acceleration correction that was applied a few increments prior to termination. Do the following: (1) Decrease the velocity of impact (2) Change the density of the material(s) where the error occurs (3) Change the modulus of elasticity of the material(s) where...
  19. GPapazafeiropoulos

    help please

    In the Interaction module, edit the Constraint-1 of coupling type, and respecify the control point. This point cannot belong to the wheel surface. To specify this point, you must select a point from the rail, or create a point where the wheel and the rail come in contact through partitioning...
  20. GPapazafeiropoulos

    need for a response

    Look at section 31.2.1 Connector behavior, of the Abaqus Analysis User's manual, as well as the *connector stop option in Abaqus Keywords reference manual. You can define connector elements in the Interaction module of Abaqus CAE. Regards, _______________________________________________ George...

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