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  1. tomsing

    McCombs's supplement to Bruhn

    I'm looking to find a physical copy of McCombs's supplement to Bruhn's Analysis & Design of Flight Vehicle Structures. I'm aware that electronic copies exist and where to find them, but this is for a university library, and don't want something that will have copyright issues. Unfortunately...
  2. tomsing

    Grid Point Singularity Table - specifically BF set?

    In Siemens' NX Nastran (and I assume other flavors of Nastran), the grid point singularity table outputs some info that I mostly understand, but I wanted to clarify some of it. Can't find great detail in the User's Guide or QRG. (Apologies if this table comes through oddly spaced.) 0...
  3. tomsing

    Looking for the Royal Aeronautic Society Data Sheets from the 1940s.

    I'm on a bit of a scavenger hunt. I've got a chart of shear buckling coefficients vs aspect ratio for unstiffened rectangular flat panels with different boundary conditions (all sides simply supported, all sides clamped, long sides SS/short sides C, and long C/short SS). One of my colleagues...
  4. tomsing

    Superelement f06 output - epsilon, spcforce resultant

    From a superelement newbie - what should I be looking for in the f06 file for a superelement creation run, and an assembly run? Just looking at linear static for the moment. If it matters, I'm currently playing around with the PCH output format. Unfortunately, the SE users manual doesn't seem...
  5. tomsing

    NASA Astronautics Structures Manual errata

    Anybody ever seen an errata list for the ASM? I have an error, but no idea if it's been identified previously, or if there's any mechanism to document it.
  6. tomsing

    NASA Astronautics Structures Manual errata

    Anybody ever seen an errata manual for the ASM? I have an error, but no idea if it's been identified previously, or if there's any mechanism to document it.
  7. tomsing

    beam shear deflection

    I'm looking at a significantly short beam, cantilevered, and wanted to run a hand calc to validate a FEM, so I figure I ought to include shear deformation in a deflection calc. Blodgett, section 2.6, gives a cantilevered beam, concentrated load at the tip, deflection at the tip of aPL/GA, where...
  8. tomsing

    4130 stress-strain curves

    In the Atlas of Stress-Strain Curves, 2nd ed, in chart AS.005 (https://books.google.com/books?id=up5KS9fd_pkC&lpg=PP1&dq=Atlas%20of%20Stress-strain%20Curves&pg=PT99#v=onepage&q=AS.005&f=false) they present 3 charts of tensile stress-strain curves up to yield for 4130 at room and elevated temps...
  9. tomsing

    4130 in the Atlas of Stress Strain Curves

    In the Atlas of Stress-Strain Curves, 2nd ed, in chart AS.005 (https://books.google.com/books?id=up5KS9fd_pkC&lpg=PP1&dq=Atlas%20of%20Stress-strain%20Curves&pg=PT99#v=onepage&q=AS.005&f=false) they present 3 charts of tensile stress-strain curves up to yield for 4130 at room and elevated temps...
  10. tomsing

    Can we use an IF statement in the input deck?

    I'm modeling a wing where the upper skin buckles under upward bending loads. The current plan is to use two models, one with nominal material stiffness in the skin for downward bending loads, and one with a knocked down anisotropic material stiffness in the skin for upward bending loads. I'd...
  11. tomsing

    Alert - Feature applied to different bodies since the last update

    I'm a new NX user, in 8.5. I'm getting an alert on an extrude feature, that is created from a sketch and extruded to the next face, which is a sweep from a sketch. The alert is, "Feature applied to different bodies since the last update". I don't recall editing any of the parent features...
  12. tomsing

    Session file - Automatically respond to popup warning

    Say I have a session file that looks like this: STRING asm_create_grid_xyz_created_ids[VIRTUAL] asm_const_grid_xyz( "1", "[0 0 0]", "Coord 0", asm_create_grid_xyz_created_ids ) asm_const_grid_xyz( "2", "[0 0 0]", "Coord 0", asm_create_grid_xyz_created_ids ) I'm going to get a message, $#...
  13. tomsing

    Nastran SOL 106 iterations

    In basic terms, what is going on in Nastran Solution 106 iterations? Say I have only material nonlinearity. Does Nastran predict the effective modulus of an element, assemble a stiffness matrix, solve for the resulting deformation, calculate the strain, and determine whether that prediction...
  14. tomsing

    Bolt shear capability independent of preload?

    I've recently heard of some testing that indicates that the shear capability of a bolt is effectively independent of the applied preload, for "normal" values of preload. The tests have been done with a bolted double shear joint, with the faying surfaces of the clamped members lubricated to...

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