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  1. Stress_Eng

    Machine Screw Pull-Out Capacity

    Just out of interest, I find myself trying to think of possible loading cases. I've never done anything like this, so my brain-storming could be completely wrong! I start to think, is there any possibility of conditions like 'irregular fuel burn' within the exhaust chamber. I'm wondering if some...
  2. Stress_Eng

    Beam Reinforcement Calculation

    Just brain-storming! A scenario ... You have an I beam. You want to attach two side plates to the web. Case 1) You put in two rows of pins evenly pitched (say 2in) 1/2in from the top and bottom edges of the side plates. The holes are slotted longitudinally. Outcome ... when the I beam is loaded...
  3. Stress_Eng

    Bolt force in sleeve connection

    You could look at the joint as a socket. Example of a loaded socket. The inner and outer parts will experience shear and bending due to the distributed contact load. The max distributed load can be used to derive hoop stress. I suggest having a look at the subject.
  4. Stress_Eng

    Beam Reinforcement Calculation

    Just thinking allowed. Immediately below the top flange, there will be a shear flow in the web. Progressing down the web, the shear flow will increase. As you get to the top of the two side plates, the shear flow will suddenly be confronted with three load paths, into the side plates through the...
  5. Stress_Eng

    Bending curvature and stress distribution in eccentric plates

    Could you show a picture of the stepped flange and how it is to be restrained about it's profile (physical attachment to surrounding structure). Also, could you explain the boundary conditions you've applied in your models, to each plate.
  6. Stress_Eng

    T-Bracket Beam Analysis

    Some food for thought. At the end of the day, you're adding the applied load to a preload condition. If you've calculated a suitable preload, the final condition should be that no gapping occurs (preload isn't overcome), and hence a reduced preload still exists and the joint contact surfaces...
  7. Stress_Eng

    Cantilever Plate bending with UDL

    The information was brought to the attention of the OP, so it may be used if necessary, depending on what criteria needs to be met.
  8. Stress_Eng

    Cantilever Plate bending with UDL

    Beams with relatively great width generate stress in the long direction due to Poisson's effect. Poisson's stiffening effect also influences simple beam theory, where E can be substituted for E / (1 - v^2). Suggest looking at Roark, section 8.11 (7th Edition).
  9. Stress_Eng

    T-Bracket Beam Analysis

    8 x F = (1x edge + 2 + 4) x T1 + (1x edge) x T2 T1 / T2 = (4 + 2 + edge) / edge (ratio of distances from free edge contact point) T1 = tension load at bolt 1 T2 = tension load at bolt 2 edge = bolt No.2 edge distance Take moments at bolt 2 free edge contact point
  10. Stress_Eng

    Splice Theory Question

    I think you'll have something like this. Edit As SWComposites highlights, the moment is resolved into a 'tension' & 'compression' couple. The approach shown in the above FBD takes moments about the contact abutment point Pa (compression) and assumes the bolts take the tension, proportioned...
  11. Stress_Eng

    Weld Size Calculation for Plate Welded Perpendicularly to RHS Beam

    I don’t know how significant this is, but don’t forget that the beam bends, resulting in rotation at the free end. The rotation and the length of the plate will result in a horizontal offset between the point of load application and the N/A of the beam at the free end, causing a moment.
  12. Stress_Eng

    Interpolating Points

    Just one of meany ways to interpolate data!
  13. Stress_Eng

    Engineering designation of critical parts

    One company I worked at had an entry in the drawing, identifying the 'CLASS' of part. Class 1 was 'Structural', in that the part had to be certified (means of compliance, be it by analysis, test, etc). Then there was CLASS 2 and CLASS 3. Class 3 was non-structural, non-load bearing, etc. Having...
  14. Stress_Eng

    NPT thread strength - Stress Distribution / Tensile Area

    Thinking about the posted question, the thread load distribution through the length of the engaged thread will be influenced by the taper in the two parts of the joint. I would think however, the distribution would be similar to a typical thread, but with the first and last few threads...
  15. Stress_Eng

    Flat Plate Bending Weld Stress

    If you’re welding in a circular plate, you could use the equations in Roark. The cylinder rotational support can be used by equating cylinder and circular plate gradients at the intersection. The cylinder will be modelled by two cylinders, one pressurised, the other not. Again, equate gradients...
  16. Stress_Eng

    NPT thread strength - Stress Distribution / Tensile Area

    I found this subject interesting and investigated it some time back (15+ years). Although I reviewed standard thread types (Metric and UNJ), and I agree that the taper will influence the load per thread through the axial joint (differing cross sections along thread engagement), I would think the...
  17. Stress_Eng

    1/2 loading for 1/2 model in ansys?

    As a suggestion, visualize the full vessel and draw a line on it where the cut would be. Then apply each load individually and visualize the deformed shape. You need the line to remain on the cut plane (deformed shape to be a mirror image about the plane). If the line doesn’t stay on the plane...
  18. Stress_Eng

    Tapped axial holes on tube

    My basic calculations (not checked or validated), assuming 350 lbf tension load per bolt, a BM of approximately 346 lbf.in per bolt (114.63 lbf.in/in x 3.02in) and no preload, indicates approx. 60% of the joint will gap. To keep the joint closed (prior to onset of gapping), a preload of approx...
  19. Stress_Eng

    Tapped axial holes on tube

    Preloading has a big part to play in fatigue. Does fatigue need to be considered? Does the part see any cyclic loading? Preloading is also to stop the joint from gapping. Sufficient gapping will alter bolt loading (all bending on bolts, no load sharing in joint). Edit - When it comes to hoop...
  20. Stress_Eng

    Tapped axial holes on tube

    Once you've derived the radial SF and BM at the base of the cylinder, the BM can be reacted in two different ways. The first is by contact bearing along the threaded length and the second is by prying action. As a hand analysis approach, you could cover both. The prying action will increase the...

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