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mrtimwinkler last won the day on January 15 2019

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  1. Hello, what does this error message means? *** WARNING # 4961 Reference stiffness underlying contact 1 is 9.860277e-11 times the average diagonal stiffness of the global model. I have TIE, SMALL friction and FINITE friction surface-to-surface contacts in my model. For all of them this error message appears after changing geometry and mesh. In the same model with a slight other geometry and before remeshing, these errors didn't appear. All i did was reassign the contact surfaces to the new mesh. Defining the contacts totaly new didn't helped. Tank you very much for your help! With kind regards Tim Winkler
  2. Hello, i found out that the problem was a high mesh distorsion due to the bead creation. My solution was a better and coarser mesh in the design space and other bead parameters (bigger minimum bead width and a smaller bead angle). Thank you for your attention With kind regards Tim Winkler
  3. Hello, i am performing a topographie optimization of a hat-shaped beam unter 3-point-bending with HyperMesh and Optistruct. My aime is to minimize the compliance beneath a certain value (objective minimize compliance, constraint compliance < 14000), without exceeding a certain mass (constraint m < 0,000553) In the optimization controls i have limited the maximum number of iterations to 100 and the convergenze criterion to 0,000001. When i start the optimization, optistruct only performs the inital analysis and one optimization-iteration. The compliance of this one and only optimization-iteration is lower then the inital compliance but higher then the desired compliance. Why does optistruct dont perform additional iterations? Thank you very much for your help! With kind regards Tim Winkler
  4. Hello Turbokraken, thank you very much for your help! This will be the best solution, especially in the long term and for future projects. Best regards and happy simulating, Tim
  5. Hello Q. Nguyen-Dai, thank you for your your answer. Unfurtunally, the geometry is more than just that one fillet with many curves and non-parallel edges to global axes. I am searching for a way to assign all of them at once.
  6. Hello, i have a curved shell-geometry on which i like to reorient the nodal coordinate systems to follow the curvature. I only like to do that for the nodes on the edge. With that nodal systems i like to assign rotational boundary condition following the curvature of the shell-geometry. I am using OptiStruct for Solving. How do i proceed to achieve this goal? Thank you very much for your help! With kind regards Tim
  7. Hello, how do i request to let Optistruct automatically write a tabluar file after the analysis (non-linear quasi-static), for example column 1 displacemen of a certain node and column 2 SPCF of this certain node? I dont want to do this with HyperView and export graph, because there are to many analysises so i want to do it automatically. The PUNCH file format only writes the results of the last timestep and don`t allows SPCF in non-linear quasi-static. The time history file T01 ist not available for non-linear quasis-static analysis either. Thank you very much for your help! With kind regards Tim Winkler
  8. Hello, how do i screen the element normals of brick elements/ surface normals of a part to check them for contact definition? Thank you very much! Tim
  9. I found it out my self. There is a master node in the rigid wall, where you can define a separately time history record of the displacement.
  10. Hello Ivan, thank you very much for your answer! How do i record the displacement of the rigid wall? In the time history options of the rigid wall you can choose the forces as variables only. Unlike with rigid bodys there is no master node in rigid walls to record the displacemnt separately. Thank you very much for your help. Tim
  11. Hello, how do i plot the rigid wall force over the rigid wall displacement and not over the time? Thank you very much! Tim
  12. Hello and thank you very much for your answer! The problem is not that the failure criteria is not reached (i have tried all of the Ioff choices with very low failure criteri limits) but that the element is not been deleted. The stress is always set to zero but the element is not been deleted. Is this a problem of the element type or property? In the same model with shell elements the elements are deleted. In the reference guide they say the deletion is posible for shell elements and thick shell elements and my model is made of thick shell elements.
  13. Hello, i simulate a three-point-bending crash test of a FRP. Therfore i use 1 solid element over the thickness, a thick-shell property (22) and the material law 25. In the material law 25 i use the energy failure criteria with the element-deletion flag Ioff=2 and a specific Wpmax. Unfortunately, when the energy failure criteria is reach, the element is not deleted but the stress is set to zero and hourglassing is beginning. How do i let the elements be deleted if the failure criteria is reached? Thank you very much! Tim
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