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  1. Guncici

    Hard Anadized (MIL-A-8625, TYPE III, CLASS 1) in a pneumatic piston application

    I have an aluminum piston that has already been hard anodized (the sleeve only). When I went to go apply pressure the assembly leaked. After doing some research I found that the hard anodize is very porous. Is there a way I can salvage these piston sleeves? Through polishing & maybe sealing...
  2. Guncici

    Extracting Mass Fractions from a Free-Free Modes analysis in FEMAP

    Hey All, Sorry if this has been discussed before but I have a question about free free modes. I am running a free free modes analysis and I need to extract the Effective Mass Fractions after the rigid body modes. However the rigid body modes take up 100% of the fraction and all subsequent...
  3. Guncici

    Pneumatic Piston hard stop analysis

    Jboggs Details. The questions is: how do I calculate the amount of Impact a fastener can take before it shears.
  4. Guncici

    Pneumatic Piston hard stop analysis

    I have a 1 time use pneumatic piston that will be operating at a high pressure. The piston will have a hard stop at the end of its stroke and I am trying to figure out the number, and size, of fasteners I need so the fasteners and wall will not shear. The piston must be pneumatic. Thanks —Joe
  5. Guncici

    USER FATAL MESSAGE 4690 (CNREAD)

    For those of you interested there was a conflict between the region ID numbers of the Contacts and slide lines, so I renumbered the contact regions and the analysis ran fine.
  6. Guncici

    USER FATAL MESSAGE 4690 (CNREAD)

    Hello All, I have come across a new error message as I am trying to run my model. *** USER FATAL MESSAGE 4690 (CNREAD) NON-UNIQUE REGION ID FOUND. REGIONS IDS IN CONTACT AND GLUE SHOULD BE UNIQUE BETWEEN BSURF, BSURFS, BCPROP, BCPROPS AND BLSEG ENTRIES. I have looked over my...

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