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Found 7 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. ## Parameters of PSHELL (Radioss)

Hi, I am working on a crash analysis of a pickup truck chassis. I have meshed all my components with 2D shell elements. i am not able to decide the values for various parameters. Can someone pls help me with the same. I just need to know which parameters should be activated and what values to use. I am using MAT36 law for the materials. Thanks, Datta
3. ## Beam Model and Shell Model Differences

Using Hypermesh 2017, and User Optistruct. I have been trying to get the contour plots of a chassis both modeled with a beam model and a shell model to match up but the deflections of the shell model are always about 2 times as large. It should also be noted that the deflection images are nearly exactly the same with the same deflection trends but just the magnitudes are different. The following conditions are the exact same for both: forces, location of forces, constraints, overall size, thickness and material. The only conditions that are different would be the properties as the beam model is modeled with a PBEAM and assigned the correct beamsection while the Shell model is modeled with a PSHELL card and then assigned the thickness. Are there any common errors that would be able to describe why the beam model has almost exactly half the deflection of the shell model? Thanks for any Help , reply if more info is needed. Nicholas C.
4. ## Free size optimization with multiple PSHELL-based design variables

Hi, I am working on a structural optimization of a model containing more then one PSHELL and PCOMPP properties. I am experiencing some issues with the sized model generated after the free-size optimization (*_sizing.fem) as output requested by the FSTOSZ line (OUTPUT,FSTOSZ,YES,4). I do not have any problem with the composite laminates but I have an unexpected behavior with the PSHELL components in the sized model generated. I try to explain the issue below with an example in brackets. If I have more then one PSHELL defined in the initial model (e.g., the PSHELL properties 2 and 3), I expect to have 4 times the number of PSHELL of the initial model in the new one (e.g, 2100, 2200, 2300, 2400, 3100, 3200, 3300, 3400) assigned to respective components (e.g., 2100->2400 assigned to components with initial property 2, and 3100->3400 assigned to components with initial property 3). The problem is that, in the new sized model generated, only 4 of these PSHELLs (e.g., 2100->2400) are assigned to components of the model and all the others are defined but not assigned (e.g., 3100->3400). Furthermore, the 4 properties considered (e.g, 2100->2400) are assigned to the entire designable space, also to components where I would have expected different properties (e.g., PSHELLs 2100->2400 are also applied to components with property 3 in the initial model, where I expect the 3100->3400 to be). This creates even more difficulties if the number of PSHELLs involved increases, because it becomes impossible to reproduce properly the optimized thickness distribution in the sized model with only 4 properties. I hope the description of the problem is clear enough. I am wondering if I miss something in the definition of the optimization problem or this is a known behavior for Optistruct. I would greatly appreciate any suggestion/information concerning this problem. Thank you in advance, Alessandro
5. ## (Beginner) How to load pressure on the thin face of PSHELL

I made a simple square(500mm x 500mm) pshell with a thickness of 5mm. I need to load a tensile pressure (1kN/m^2 = 0.001N/mm^2) on each thin faces of the shape, which will stretch my square side-to-side. But using the pshell, I can't select on the thin face of the shape. How can I load a pressure then?
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
7. ## PSHELL issue

While examining my .dat file for property details, i found few lines in between the property data (image attached). Is this is an error in modelling or something error in working method. Please guide me. Thanks, Prabhu P
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