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Eric Lantz

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  1. Hello, I had a look to the topic below and I partially solved my problem. I reinstalled Hyperworks without the 2017.2.2 hotfix and now I get 16 plies (original ply number = 4). However, the ply numbering convention is still violated. Do you have any idea why ? Furthermore, I become following message after the size-optimization : What does "small design change" mean ? I find it strange that the mass is unaltered during size-optimization. Thank you in advance. Eric
  2. Hello, I am currently doing the optimization of a monocoque car body (CFRP and Aramid-core). Free-size optimization was successful, but I have some doubts/questions about size optimization. As you can see in the following picture, I get 277 plies (which seems to be excessive) after the free-size optimization. Furthermore, the plies designation doesn't comply the ply numbering convention (LPPSNN). I don´t understand why, because I followed all the steps in the e-book "Introduction to Practical Aspects of Composites". I can share you my model if necessary. Thank you very much for any help and have a nice weekend. Eric
  3. Hello, I worked on my model in the last few days and I have another questions about it. On the picture you can see the five under-layers A, then the aramid-layer B and the group of layers C and D. In blue the insert E. On the upper zone, I made a laminate with : - Five CFRP plies under the insert - Five CFRP plies over the insert - Two steel plies (thickness 1 mm between the CFRP plies and 20 mm for the rod) As I said, I don´t want to optimize the two steel layers in blue (which are the insert). Is it possible to let Optistruct optimize just some layers from a laminate ? Am I right when I consider the insert as two plies instead of an independent PSOLID component ? Furthemore, is it possible to improve the meshing of the rod (which is a ply) ? Thank you for your answers. Eric
  4. Hello, Thank you both for your answers and your very interesting model tinh ! You can see on the picture below wat I want to have at the end with a cut on the XZ-plane. Here I just make translations of each part to show you but actually I want to ensure that the steel part E is overhead the layers of the group C independently from the thickness of the layers C (and the same between the groups C and D). It´s important for me especially for the optimisation part where the thicknesses are changing.
  5. Hello, Thank you for your answer. Can you maybe short explain how I can include a PSHELL or PSOLID element in the laminate ? I´m a beginner and I only managed plies with the PCOMPP property. Furthemore I still don´t see how I can create an interface laminate with a full steel part (I dont want to optimise this part, just the CFRP layers around this part). Eric
  6. Hello, I didn´t try this but E isn´t a composite layer, it is a simplified 3D steel part (see picture below) which is glued on a group of composite layers C and laminated with another group of composite layers D. Eric
  7. Hello, I am currently working on a project where I have to optimize the monocoque structure of a lightweight vehicle. The materials used are carbon fiber reinforced polymer and aramid fort the core. In some places, there have to be inserts so that for example the belt or the seating can be fixed. The goal of my task is to make a composite optimisation with Hypermesh/Optistruct for the monocoque and particularly the insert zones. On the picture below you can see the structure of the insert zone. First there is a sandwich-structure with layers of CFRP (A and C) and aramid (B), which forms the monocoque structure. Then I have the insert (E) which is glued on the top of the CFRP-layers (C). Another CFRP-Layers (D) are laminated on the top of the insert zone, except the threaded rod of the insert. I have some difficulties to simulate this structure on Hypermesh. Insofar as I have several layers (C) of CFRP between the aramid and the insert, the insert is merged in the CFRP layers (in the 2D detailled element representation). I want to have the insert (E) on the top of the last CFRP layer. Do I have to create a contact between the last CFRP layer and the insert? On the picture below you can see my problem (the D-Layers are not shown in this view). I have the same problem to put the CFRP layers (D) on the layers (E) at the places where there is no insert (around the insert). Thank you for any help, Eric
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