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  1. MartinShane

    Error FEA simulation on Solidwork

    Didin - As shaggy noted this would indicate that your model is not sufficiently fixtured. Your image shows us the error message, but does not provide any usable information about your applied fixtures, and will not allow anyone to aid you any further. This puts us back in the situation...
  2. MartinShane

    Glass weave style numbers, 120, 7781, etc.

    I haven't been at this as long as some, but I haven't seen a weave openness spec on carbon or glass fabrics. I've seen fabric openness defined by % of light that passes through the fabric (on curtains for example), but have yet to find an equivalent in structural fabrics for CFRP/GFRP. Likely...
  3. MartinShane

    How to show stamped "PATENT PENDING" wording on a SW part?

    Also possible -> create a Decal. Gives a fair amount of flexibility Attached image took about a minute to create a picture in paint that said Patent Pending, Photview>Edit Decal>Select Geometry and so on. A tutorial with a full walk through should be easy to find...
  4. MartinShane

    Meshing

    As Greg and Marty indicated, smaller is not the automatic answer, if for no other reason than the fact that your computer does not have unlimited resources and you have to draw the line somewhere. What you may want to look into is Convergence Analysis - Basically using finer meshes until the...
  5. MartinShane

    "Remolding" Thermoset CFRP Sandwich Structures

    In this case the length of time is not very long - 4 years maybe - but how/why the process was adopted has been lost.
  6. MartinShane

    "Remolding" Thermoset CFRP Sandwich Structures

    I'll chalk creep up as "Something Obvious." It's probably of note that in my case, and it sounds like the other cases described, the deformations are largely taking place out of the plane of the laminate such that the reinforcement fibers are un/under-engaged in supporting the load that causes...
  7. MartinShane

    "Remolding" Thermoset CFRP Sandwich Structures

    Short form version of my question: Has anyone heard of returning an Epoxy/CF structure (That is fully cured) to its mold and heating it above the glass transition temperature of the matrix as a means of improving accuracy of the molded surface when compared to the ideal (CAD) surface? Long...
  8. MartinShane

    SALT TEST

    Not familiar with the standard, but did just glance at it. Are you referring to the Section 11 Salt test via ISO 8502-6 and ISO 8502-9 ?
  9. MartinShane

    quotes for Atomic Layer Deposition services

    @cloa - Interesting, I haven't seen these before. Speculating that he wanted to make a reactive block rather than foil?
  10. MartinShane

    Comparing a three- layer Sandwich Panel with a one-layer one

    First, curiosity forces me to ask why you would want an Al/CF/Al sandwich. Second, its not clear to me what you are asking. If you are asking if it is appropriate to validate your design by doing an analysis of a single piece of aluminum that is as thick as your sandwich the answer would be...
  11. MartinShane

    Orthotropic material and its stiffness matrix

    I don't believe so. Positive Definite compliance matrix is a necessary condition for maintaining positive strain energy.
  12. MartinShane

    MS in Engineering or Law School?

    Given all I've heard in the news in the last year or two I'd never dream of going to law school right now... Denver Post Article Forbes Article The Atlantic Article
  13. MartinShane

    Sweep Unexpected Twist

    OK... so what, I have to refresh every time right before I post to make sure CBL hasn't already reposted what I was doing??? :)
  14. MartinShane

    Sweep Unexpected Twist

    And the added plane I guess doesn't have to be there, so 3. I Have a hunch that it could be done with 2 features, using just a boundary surface and the intersect, Possibly 1 with a boundary boss/Base feature. Both of those would require additional sketches though, so there'd be more work...
  15. MartinShane

    Sweep Unexpected Twist

    Interesting CBL. I play in surfaces a fair bit, and never used the intersect feature before. I'll have to look at that closer as it seems like at the very least it can eliminate a step in the model tree compared to my standard routine of knit + combine. In the interest of seeing how few steps...
  16. MartinShane

    Sweep Unexpected Twist

    I was working along a similar path using surfaces before seeing CBL reposted a solution. Here is how I was going about it, late to the party though it may be. http://files.engineering.com/getfile.aspx?folder=f6ae44db-dc1a-4254-b2fc-36c5ea4dba91&file=Twoshot_v1-Bottom_MS.SLDPRT
  17. MartinShane

    Teardrop Shape

    Why didn't you go with R.619 ?
  18. MartinShane

    FEM Software for Mac?

    or use something like this: Bootcamp and choose a windows based program?
  19. MartinShane

    Sweep Unexpected Twist

    JM's suggestion to apply a second sketch / curve as a guide is likely to work. Alternatively you could form the faces of your tab using surface extrusions + trimming, then knit them into a solid and combine with your existing structure.
  20. MartinShane

    Finite Analysis of fabrics

    A picture or sketch of your model / loading might make it easier for people to help.

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