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Found 6 results

1. ## Material Orientation in 2D shell elements: Possible to define 1-direction out of element plane?

Hi everyone, I need MAT8 material behavior (especially E1 & E2 important) for a curved shell structure, meshed with 2D elements. In my special case, the material orientation (E1) has to be the direction of the Z-axis of the global coordinate system. 2D > composites > material orientation > by system axis > local 3-axis If I define it like that and display the material orientation for the elements, however, the vectors always lie within the element plane and are not parallel to the global Z-axis. Is it possible to have a fixed material orientation independent of element orientation (e.g. global Z-axis) for 2D elements? This would mean that the E1 direction would be out of element plane in some cases, as shown by the orange arrows in the figure below. The pink vectors in the example image always lie within the element plane - thats not what I want. Thanks for your input!
2. ## Carbon fiber reinforced epoxy composite modelling

Im trying to model a simple plate structure with Carbon fiber reinforced epoxy (CFRE) as the material. This is the first time Im modelling composite so Im trying to get the idea. As far as I know, I need to use MAT8 for material properties. What are the properties that are crucially needed to key in the MAT8 card for normal mode analysis? For modelling, Im going to use 16 layers of carbon fibre fabric and epoxy as the matrix. When modelling the ply, each ply will be model as the composite of CFRE (16 plys of CFRE) or the ply need to be model seperately like carbon fiber and the matrix (16 plys carbon fiber and ply between the fiber for epoxy).
3. ## Converting shell elements to solids

Hi guys, I'm currently developing a complex composite structure und simulated it already with optistruct with shell elements (Mat8, PCOMPP). In order to distuguish different failure mechanisms I need analyse the stress in thickness direction of the structre. For that I used the "shell-to-solid conversion" within the aerospace menu. Now that I have a solid mesh, I'm not sure how to proceed. What property do I assign to the solid mesh ? What material card do I use for it ? Do I need to assign the material orientation to the new mesh again and if yes, how do I do that ? Thanks in advance
4. ## How to design a honeycomb sandwich plate

Hi, i want to create a Sandwich plate with a honeycomb core, like shown in the attachment. I want to do that with the tool hyperlaminate. My upper and lower plate is normal aluminum createt with the MAT1 Card. But how can to create the honeycomb core? I thought i could make it with the MAT8 Card, but I don´t find any properties for the Input. I took the MAT8 Card, because my moddel is built up with shell elements. Thanks for your help.
5. ## Honeycomb composite as MAT9

Hi all!! I have a question, which might seem quite obvious but it is driving me crazy. I am modelling honeycomb panels with 2D surfaces. Until now I have always modelled this material as 2D orthotropic, so with MAT8. Now my materials have changed and the following question arises to me: For the core ply, information available from manufacturer data sheets is the following: E3, G13 and G23. However, if I want to treat my model as surface, it is not possible with MAT8, because material parameters that I can introduce there are E1, E2; G12, G23, G13 and Poissons ratios. Is there any estimation or any conversion possible in order to make it work with shells? Another possibility is to model it with solids and using the Optistruct Engineering Solutions tool, which enables me to create a solid out of shells; however, when using it all contacts between surfaces are lost. Has someone faced the same problems when modelling honeycomb panels? It would be of great help. Thanks in advance!! Regards, Andrea
6. ## 3-Point Bending of Carbon Fibre Sandwhich Panel

Hi, I have some questions I was hoping someone could answer. I am trying to model a sandwhich structure with carbon fibre skins and aluminium honeycomb core and then perform a 3 point bending test in the software if possible. 1. Could someone please explain what the reason is for selecting PCOMPP, PSOLID etc, what are the reasons for choosing one of them over another? 2. Which compersite property: PCOMPP, PSOLID, PSHELL, etc, do I need to select for the task I want to achieve (3-point bending simulation)? 3. Another question relates to my understanding of the MAT 8 card....would I be correct in saying that as MAT8 only asks for the in-plane properties, it would not be possible to get proper results for a 3-point bending test in the software? (Or does the software still work this out?) 4. Would I need to use the MAT9 card for what I am trying to do and in that case what composite property do I select, PCOMPP, PSOLID, PSHELL, etc? 4. If I select for example PCOMPP for the honeycomb properties, do I have to select PCOMPP for the carbon fibre skin properties? Regards
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