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Found 6 results

  1. Hello, I am simulating a three point bend test on a composite sample. I would like to simulate/ analyse a range of forces at once and view the analysis as a graph rather than simulating one force to be applied separately. Can someone instruct me if its possible to use a previously meshed model from HyperMesh in HyperStudy to apply parameter sweep of forces? Many thanks
  2. Hi everyone; I want to know if we are able to use composite fabrics in composite optimisation? I mean, composite fabric = a layer that consist of different oriented fibers and sewed together. Composite manufacturers sell them like this. In all hypermesh composite optimisation tutorials, they use individual plies which are fibers in one direction only. I want to use different fabrics (one is 45,-45,90 - 600 grams and 0.5mm - the other is 45,-45,60,-60 800 grams and 0.75mm for example), and conduct free-size, size and shuffling optimisations using these fabrics. Does anyone know how to do this? Thanks in advance for anyone replies.
  3. Hello, I am simulating a three point bending test for a composite laminate layup and I would like to find the force require for failure or alternatively a method of obtaining the point at which any specific ply has failed under the application of a specific force? Many thanks, Ahmed Gehad
  4. Hi, I'm trying to understand LAW 25 with CRASURV formulation. So I perform a single element test to see how it works. As far as I can see from the Radioss Reference Guide, it should be possible to use different values of plastic work for each material direction by setting the Flag Iflawp=1. So I do that, but there was no effect. The global criteria (Wpmax) was still the dominating one and the local one (Wpmaxt1,Wpmaxt2,.....) has no effect. That means, the Element is ruptured when the global criterion is reached. If I deactivated the global criterion the local one also has also no effect, which means that the element is not ruptured. What do I wrong? best regards
  5. Hi All, I'm currently attempting to run an analysis on a carbon fiber/honeycomb structure. The composites is set up off of a meshed 2D surface by creating plys to determine the direction, thickness, material, and selecting the designated elements. They were than organized by creating a symmetric laminate and than a PCOMPP property is assigned to the same 2D elements as the plys. When I put the 3D element representation on and turn on the composite layers, everything looks exactly how it should, but I am receiving the warning below warning when I run a check in Optistruct. *** WARNING # 1569 for property id = 19. Thickness is zero for this composite. This will produce meaningless stress results and may cause singularity of the global stiffness matrix. Property 19 is the property where it assigns the PCOMPP property. The analysis does run up until it hits error #153 which seems to be caused by the above warning. *** ERROR # 153 *** Exactly zero pivoting encountered during Numerical Factorization; the model may have rigid body mode. Solver error no. = -503 spc set id = 2 index = 1 Possible reasons are: 1) insufficiently constrained model, 2) having rigid body mechanisms within the model, 3) extremely ill-conditioned rigid element sets, 4) extremely thin shells (as used for "skinning") that have MID2/MID3, 5) gap elements with extremely high stiffness (KA, especially KT or MU). Check the model and rerun the problem. (MECHCHECK may be used to find the rigid body modes. To do so, change the input to be an eigenvalue analysis and add MECHCHECK.) (WARNING: results obtained with MECHCHECK cannot be used because the model is changed internally.) This error was detected in subroutine bcsmtxfct. Does anyone know what might be causing the initial warning in this model? It seems weird to me that it says that it has zero thickness but when it's in 3D element representation it shows the thickness of the carbon layers and the honeycomb core.
  6. Hi erveryone, I'm trying to do a composite crash analysis. So I have to calibrate a square Composite Plate, consisting as 9 Elements, regarding the released Energy. I perform tensile and compression tests for every materialdirection. In tensile direction the model worked pretty fine, but in compression occure some unexpected troubles. Compared with the theory, the three Elements of the middlesection should be deleted and the total energy of 7 Elements should be released. With a coarse mesh size of 3 and 5mm this work well, but I cant't reproduce this behaviour with a finer mesh of 1mm. Any ideas?? I use Law 25 in Crasurv formulation and tried out different constraints (Imposed velocity and displacement) and element formulations (QBAT, QEPH) but no effect. Best regards
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