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Freddie

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About Freddie

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    United Kingdom
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  1. Thank you for your response. Unfortunately I'm getting a license error when opening the software. The altair_lic.dat file can't be found but I have it copied in to the security folder and followed all the instructions from the license email so it looks like I can't use the software. I spent all day trying to sort this out changing file directory permissions etc. I may have to change to ANSYS.
  2. Thank you very much for your response. 1. Would PCOMPP be the appropriate option for me because my plan is to define the properties of each ply? (Also the properties aren't isotropic as I have UD layers.) 2. Regarding point 4, you mention doing a quasistatic test....it seems from a quick google that RADIOSS is used to do this? I was wondering if there are any other methods of doing this within altair because chances are I run into a problem and I'm very tight on time at the moment so I'm just trying to keep my options open? Regards
  3. Hi, Sorry that I have only just seen your reply and thank you very much for your response. I was waiting to receive a notification email because I selected that option on the site but never got one unfortunately. 1. You mention that MAT8 has bending stiffness so I checked the MAT8 property card again and saw that the only properties required that are out of plane are G1Z and G2Z, these are not bending stiffness values so do you mean it works it out based on the card inputs (E1, E2, NU12, G12, G1Z, G2Z, A1, A2)? 2. You also mention that "PCOMPP or PSHELL property is used on the skin." Are there any particular reasons for selecting one over the other? 3. You mention the use of the "explicit time integration scheme (RADIOSS)", I am completely new to the software but from my understanding from looking up what this means I have seen an explanation which says: "the explicit scheme determines the velocities and displacements by direct integration of nodal accelerations." Does this also then provide the force (load) of the cylinderical 3-point bending load applicator? So would it be possible to output a load-displacement graph typical of a 3-point bending test with this method? 4. Also if this method is rather complicated are there any simple ways of just applying several different load values and then simulating the deflection of each defined load? (The point of this for me would be to workout the flexural rigidity from several load-displacement values from the software.) Regards
  4. Did you have any luck doing this, looking to do exactly the same thing, any tips would be appreciated or even your model file if you got it working would be amazing?
  5. 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
  6. 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. Hi, My questions is about the Gij values. I have all 9 properties required to define an anisotropic honeycomb. That is: E1 (GPa) E2 (GPa) E3 (GPa) G12 (GPa) G13 (GPa) G23 (GPa) ν12 ν13 ν23 So I am looking at the MAT9 – Material Property Definition, Form 9 found here: https://www.sharcnet.ca/Software/Hyperworks/help/hwsolvers/hwsolvers.htm?mat9.htm and my confusion arises with the following sentance: "The subscripts 1 to 6 refer to x, y, z, xy, yz, zx of the material coordinate system defined by the CORDM field on the PSOLID entry." Gij is apparently the material property matrix, so I'm assuming my 9 properties should correspond to the matrix of Gij's provided. This would make sense if the Gij matrix subscripts were just numbered 1 - 6 but there are subscripts like G66 and G56 for example which according to the defintion should mean Gzxzx and Gyzzx which doesn't make sense. Could anyone let me know how the values in my table match up with the subscripts please. Regards
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