Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. Doodler3D

    Dark Mode

    A "Dark Mode" site setting should be included. Change is welcome, but subtly, for example, McMaster-Carr. Current changes are drastic.
  2. Doodler3D

    Transportation Trailer Bed Skids/Crates/Pipe Stake Acceleration Forces

    Hi, I need some further clarification on thread794-436068 There's an ASME guide for pressure vessels transportation and there's a separate requirement set by the FMCSA for securing cargo and equipment. Does the FMCSA guide have a safety factor built into the recommendation and are there...
  3. Doodler3D

    Boeing 737 MAX production hit by a new defect in part from Spirit AeroSystems

    Link Misdrilled holes in aft bulkheads
  4. Doodler3D

    Plum-Pottstown, PA Home Explosions

    A hot-water tank and leaking gas pipelines or abandoned wells? Video: Link Identical incident last year: Link Link
  5. Doodler3D

    Plastic Collapse of a Beam

    All, thank you for your inputs. I was curious to know how ANSYS solved the BEAM models with a "close" plastic collapse load, as BEAM188/189 does not support multilinear isotropic material models (section b). I completely overlooked the element formulation conditions that are acceptable for...
  6. Doodler3D

    Plastic Collapse of a Beam

    FEA way, I'm using Ansys, Yes, it's a full nonlinear solution. As far as I know, the error listed above is something to do with Sparse vs PCG solvers. I do not get errors associated with material nonlinearity while using an elastic plastic model (Multilinear isotropic hardening).
  7. Doodler3D

    Plastic Collapse of a Beam

    All, I’m working on a simple beam plastic collapse static analysis for some basic benchmarking in Ansys WB. The problem in question is a solid rod (φ = 0.85”, 16” long, σy = 60 ksi) fixed at both ends. A concentrated load acts at the center of the rod at is applied till solver divergence. A...
  8. Doodler3D

    Air Distributor Pipe Pressure Measurement

    @FacEngr, those are pricey. I did some PIV at university, the optics and lasers were ridiculously expensive. I have limited budget to set up a 16 channel DAQ.
  9. Doodler3D

    Air Distributor Pipe Pressure Measurement

    Thank you all, I will post an update when the DOE is complete. There's surprisingly thin amount of information available on compressed air applications like soot blowing and blow molding.
  10. Doodler3D

    Air Distributor Pipe Pressure Measurement

    I do not have details of the sensor/DAQ used, but the DAQ sampled at 600Hz. 5 years ago they were still using a primitive, hand-held 4 channel DAQ from the early 2000's. The improvements are as you mentioned - spray patterns, pressure impulse and equalization of flow. The tank is at 8 bar and...
  11. Doodler3D

    Air Distributor Pipe Pressure Measurement

    All, I've been tasked to improve a previous experiment for a soot blowing application. Air is being fed from a 30 L tank at 8 bar. The diaphragm valve pulses for 50 ms and the goal is to measure specific impulse pressure across the tube. Since this not a steady flow application, what are the...
  12. Doodler3D

    Stiffening a Corrugated Sheet

    Dave, Its the base of a screw extruder and tight tolerances are to be maintained for the screw. BTW, I put on my dunce cap for mixing words.
  13. Doodler3D

    Stiffening a Corrugated Sheet

    Centondollar, thank you for that, Timoshenko's Plate book is on my desk and I'm assuming you are eluding to sections 20 onward. SlideRuleEra, you are correct, the stiffeners are rather thick.
  14. Doodler3D

    Stiffening a Corrugated Sheet

    Overseas supplier (close to the installation site) is not willing to share design calcs, except that deflections are limited to 1/8". Currently exploring local fabricators to get this done, hoping that some basic reference calcs will help them out.
  15. Doodler3D

    Stiffening a Corrugated Sheet

    Hi, What are some quick hand calcs to estimate the stiffening required for a corrugated panel? Traditionally, the general approach is to rib the hell out of the structure based on tribal knowledge, but I was hoping for a nudge in the right direction to optimize moment values for the stiffeners...
  16. Doodler3D

    Table 5.5: Factored Load Combination for Bulk Material. ASME VIII Div 2

    Thank you for confirming TGS4.
  17. Doodler3D

    Table 5.5: Factored Load Combination for Bulk Material. ASME VIII Div 2

    Hi, For a mixing vessel, how would the design margin of 2.4 be applied to the static load from a bulk material? The powder weight results in a nonlinear distribution of wall stress due to cohesive forces and wall friction. These distributions were calculated from Jansson/Jenike theory since...
  18. Doodler3D

    Hopper-Transfer Chute Extrusion Screw, Vertical Pressure

    Thanks human909 for abating my concerns. The design failed by elastic, limit load and elastoplastic FEA and got me perplexed. I've been using the Blodgett-Troitsky-Gaylord books for reference and hand calcs. I'll dig deep into the Eurocode and convince the manager to take that route.
  19. Doodler3D

    Hopper-Transfer Chute Extrusion Screw, Vertical Pressure

    human909, Basically, the client does not have the external and friction angles for the product and the FEA report provided uses a massive element size leading to a safe design. I re-ran the FEA with a mesh convergence and it fails at the screw extruder if I assume that the contents are...
  20. Doodler3D

    Hopper-Transfer Chute Extrusion Screw, Vertical Pressure

    Hi, Would it be appropriate to use the Janssen or Jenike equations to calculate the vertical and wall pressure at the base below the extrusion screw? I'm assuming the presence of the screw blades would increase surface area and significantly decrease the vertical pressure on the base. A...

Part and Inventory Search

Back
Top