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  1. stresscalcs

    Dissimlar Meshing of Congruent Surfaces

    Using Patran, I am experimenting with "Glueing" mismatched meshes. Consider a 2D situation with 2 independent pairs of rectangular surfaces. One pair (A) with a single common edge of the dissimilar length. Method of surface generation was using a surface vector. The other pair (B) with a common...
  2. stresscalcs

    Excel 2016 (2010) Conditional Formating Question

    I have a attached an Excel file with two columns. Each column has a single formatting rule (shown in a graphic), where I hope what is wanted is obvious from the graphic. I do not see the results I am expecting. Could somebody help and explain what is going on...
  3. stresscalcs

    Panel under Bi-axial Compression Stress and Shear

    Hi I have been looking (text books & stress manuals I can access) to see if I could find an interaction curve dealing with a panel buckling under bi-axial compression and simultaneous shear without success. I have seen many interaction curves, but this one I have not come across. From what I...
  4. stresscalcs

    Aluminium Material Dimensions before Machining

    Hi In the Aircraft Industry it is normal practice to choose the size of an Aluminium block to be machined to be well oversize compared to the final machined part required, so that all the block outer skin/surfaces are totally removed whilst machining. Could anyone point me in the direction of...
  5. stresscalcs

    Old Versions of MIL-5 Material Handbook

    Hi Does anybody know where older versions of MIL-5 Materials Handbook may be viewed/downloaded? So far my Googling finds nothing older than version G. Many thanks for any help. Richard
  6. stresscalcs

    Nastran Displacement Coordinate System

    Hi Anybody able to help me and tell me 1) where do I find a definition of "Displacement Coordinate System"? ref. 2004 Nastran Reference Manual page 42. 2) Can you define it somewhere in Patran? I have been unable to find anything meaningful. TIA Richard
  7. stresscalcs

    Consequeces of "Knife Edges" with Countersunk rivets

    There are quite a lot of comments about countersunk rivets, their strength allowables and how deep you can countersink in the forums. However, I can find virtually nothing about the 'consequences' of actually having a 'knife edge'. Most of us will probably know the picture of head shear off...
  8. stresscalcs

    2 Hole Concentration Factor

    I have recently seen an Airbus Excel spreadsheet that predicts the maximum Kt factor for two dissimilar diameter holes at variable distance and angle orientation in a plate for a uniform direct and shear stress conditions. There is no reference to the source document for the calculation method...
  9. stresscalcs

    Grumman Stress Manual?

    Is there anybody out there who can perhaps help with the possible contents of a Grumman Stress Manual (if that is what it was called). I was recently asked about a reference (date unknown to me) for Grumman's analysis for curved panels in shear. The question was stated as Grumman's analysis...
  10. stresscalcs

    Relating Loads to Stiffness for a Nastran CBush

    Can anybody tell me about or point me in the direction to find the relationship between the shear loads and the shear stiffness of a Nastran CBush. The axial load is the normal P = k * d. It would appear not to be the case for shear loads. I have been unable to find anything on the net. Is it...
  11. stresscalcs

    Bolt Group Analysis with FE

    I am currently looking a a problem of trying to establish the difference of attachment loads in a attachment group in the three situations of 1) Attachment loading if only the attachment strengths are considered (strengths are either shear or bearing). This is the standard hand method we are...
  12. stresscalcs

    Mathcad Registration Required?

    It is a long time since I used Mathcad on my own computer and now I think I have to reinstall it on the new one. I started my old Dell (2x800Mz Intel CPUs & Windows 2000) and found I had version 11.2a installed. As PCT have made such a pigs ear of updating Mathcad and show little interest in...
  13. stresscalcs

    Column Buckling Analysis

    I have recently been confronted with a long column buckling problem where the column ends are PARTIALLY restrained. Further, unequal bending moments are simultaneously applied to the column ends. All the textbooks and internet documents I have been able to find do not deal with this partially...
  14. stresscalcs

    Alu Extrusion Welds

    In the process of producing a hollow shape as an extrusion, when the extrusion is not specified as seamless, extrusion weld(s)(seams) are formed somewhere around the cross section. The idea that two (or more) free edges of material flow together to form a continuous material section leads to the...

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