Search results for query: *

While I think the marketing is a bunch of foolishness I have to say that I love Pro/E MUCH more then Solidquirks. It seems there are several in this thread that have difficulties with Pro/E but there are also those like myself that find Solidworks both harder to use as well as far less capable...

I agree with everyone so far. I wish you could do things without moving to another tab. I hope PTC fixes this. On a side note to those of you who have mentioned the look and feel of Solidworks...I have the unfortunate experience right now of using this software and I can tell you I prefer...

Please keep in mind folks I am not looking for material alternatives...just if anyone knows about the possibility of a transverse CTE or not. I know there are other materials out there but a cast sheet that is 288" long x 120" wide x .5" would cost $$$$$$$$$$$$$$(if anyone would even make it...

My mistake... the heat treat is 6061-T651 NOT just -T6

Yes I know that the CTE for composites can have directional variables. I have calculated that out and because of the layup schedule and the use of carbon fiber (primarily) the CTE is very close to zero in both directions. Theoretically the total expansion in any direction (for this layup) is...

My observations were not from a strain gage but in the size of the composite part that came out of the tool. The sheet is not warped and I do not feel that the residual stesses are the culprit since it is repeatable and we do not heat the sheet above the heat treat temp. The sheet is only...

Hi Does anyone know if there is a difference in CTE for large sheets of rolled 6061-T6 between the grain direction and the transverse direction? I have some large sheets (288" long x 120" wide x .5" thick) that do not behave the way I would expect. The expansion seems different perpendicular...

I appreciate those that want to help on this issue. I am aware of the different uses and why not to use one or the other (foil vs mesh). Suffice it to say, in my case I need to use foil. My primary question is bonding, not why I chose a particular material. This application is not lightning...

I am looking for recommendations on bonding copper foil into a fiberglass or carbon fiber laminate. The copper foil will be near the surface of the laminate but will not be exposed to corrosion environments. I am having a hard time getting a good bond. Would the use of BR127 or BR6747 help me...

Yes I do this all the time. Mechanica has the following options for material orientation on shells. 1. Referenced Coordinate system 2. First Parametric direction 3. Second Parametric direction 4. Projected vector All surfaces have "direction curves" so you can assign the coordinates to follow...

You can use either a surface or a solid. If you use a solid then you have to pick the surface of the solid that you use as the shell. Either way you end up with just a surface for the FEA so you have to constrain it just like Steve said. The only time I use solids with laminates is if I intend...

From what I understand you can use a fastener to connect these. If you are connecting a shell to a solid you can only use a "bolt" fastener, not a "screw" fastener. Read the PTC faq on fasteners, it is very useful. Keep in mind that rivets do have a preload too so you might want to use the...

The loads are moderate (.7 psi) and will result in around 15,000 lb on the panel. I still might make the beam out of carbon but the cost is significantly more then steel...and the stiffness is not there for the grade of carbon that we are using. At this point I am still brain storming...I will...

Hello, I need to support a long carbon panel (19 feet) with a stainless beam and they need to be bonded together to prevent leaking etc. Only problem is the CTE would cause a difference of around .25 inches over that length and the temps. it will opperate at. Does anyone know of a good...

With some experiments I can say that the results from Mechanica using advanced shell (laminates) is pretty good. The material properties I used were derived as well as from the mfg. I did a validation test this morning and was only 2-3% off from predicted deflection so I am happy now. FYI the...

Anyone out there that is using the advanced shells and laminates in mechanica for composites? I would like to chat if there is. There is almost no information on this on PTC's web site and support does not know to much.

Hello, How does everyone handle composites in a BOM? I have done this sort of thing manually in the past by putting the laminate schedule down etc. but treating the laminate as a single part. I just wonder how everyone does this when it comes to using a PDM system. One thing I have thought of...

I would like to use Nastran and the Laminate Modeler but unfortunately our company does not have the money for that right now. I have not used Patran before...just looked at it. When you use the shell elements in Mechanica are you using solids with mid-plane extraction to determine the shell or...

Over the last month or so I have found that using a solid core works well if I use the actual composite materials editor. This does not do the mid-plane extraction that mechanica does so well but requires the use of a surface. This surface is then assigned the lamination properties based on what...

I tried doing a verification model (simply supported beam) today with a composite sandwich and got very different results. Any thoughts? Method 1: All solid elements were used for both the thick core material and the laminate. The material properties for the core is isotropic (foam) and the...