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  • Users: Doodler3D
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  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

    Plum-Pottstown, PA Home Explosions

    A hot-water tank and leaking gas pipelines or abandoned wells? Video: Link Identical incident last year: Link Link
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. Doodler3D

    NBCC 2020 Seismic Evaluation - Table 4.1.8.18. Non-structural Components

    Hi, For a vibrating screen with 3 dofs bolted on a 2-level, cross-braced w-beam structure, is it appropriate to evaluate the component as rigidly fixed or flexible? Thank you
  10. Doodler3D

    CUI vs Zinc Primer

    Hi, In a supply chain mix-up, the supplier delivered a high temp CUI primer instead of a silica-zinc primer. The lead times to get the correct coating is eight weeks while the equipment is scheduled to ship out in a week. Both primers are rated for 1000F while actual application will see a...
  11. Doodler3D

    Wind Load on Square/Rectangular Tanks

    Hi, Referencing ASCE 7-16: Is Chapter 29 the prescribed method to evaluate wind loads on square steel tanks? Alternatively, does a square/rectangular tank behave like an enclosed building and hence is chapter 29 less conservative? Thank you
  12. Doodler3D

    Line Forces and Line Moments For Battelle's Structural Stress for Fatigue

    All, I'm trying to verify Battelle's structural stress method by Dong for shell elements. For a start, I'm doing a quick calc on a spreadsheet before diving into an APDL script. Is there a way to estimate or hand-calculate a value for structural stress and can membrane stress be negative as in...
  13. Doodler3D

    ASME VIII Div. 2, 5.5.5 for Shell Elements

    Hi. A couple of queries on the computation of nodal forces along the weld - is σmi and σbi the averaged value of stress across an element or is it the maximum unaveraged value of stress for the element along each force line considered? How many elements are to evaluated for the method for a...
  14. Doodler3D

    Unusual Corrosion Paint Spec

    All, Would an silicone alkyd resin topcoat work with an epoxy polyamide base? I've seen either epoxy or alkyd systems but not both of them together. The spec is for an ISO 12944-C5X @ 200oC COAT 1: ORGANIC ZINC PRIMER COAT 2: POLYAMIDE/NOVOLAC EPOXY COAT 3: SILICONE ALKYD RESIN Thank you.
  15. Doodler3D

    Incremental Plastic Strains, ASME Local Failure Assessment

    Referencing thread727-483933, pertinent to ASME BPVC Section VIII, Div. 2 Part 5.3.3, protection against local collapse, elastic-plastic method At any given iteration, the "incremental" equivalent plastic strain is used to verify the strain limit. However, NLEPEQ or EPPLEQV_RST (Ansys...
  16. Doodler3D

    Blodgett Design of Welded Structures 6.4- How to stiffen a panel

    Hi! Elementary question, but I was looking at some clarity regarding the width of a full panel versus distance between stiffeners with respect to the following statement mentioned in chapter 6.4 of Omer Blodgett's Design of Welded Structures. I've been using the spacing between stiffeners as...
  17. Doodler3D

    Interpreting a negative value of equivalent plastic strain

    All, What could result in a negative value of equivalent plastic strain?? Errors in extrapolating values from the Gauss points to the nodes or simply an elastic response within the VM yield surface? Is there a way to check this? I'm using inventor Nastran, so I can't access data at Gaussian...
  18. Doodler3D

    FEA Benchmarks for Thin Walled Structures

    All, I've been preparing early-career FEA documentation to ensure appropriate verification of FEA models. Any advise on the best approaches (in no particular order): 1. Closed form, second order formulations from classical texts ex. Timoshenko 2. Empirical/Semi-empirical formulae (Handbooks...
  19. Doodler3D

    Single perturbation load vs Linear Buckling Eigenmode Perturbation for Nonlinear Buckling

    Hi, Are there guidelines to implement single perturbation load vs scaled eigenmode perturbation from linear buckling for a nonlinear buckling analysis of pressure vessels (ASME Section VIII Div. 2, type 3 buckling)? PVT-17-1030 does a good job of summarizing different methods, but...
  20. Doodler3D

    NACE vs ISO Requirement

    Hi, A client requested ISO 12944 C5M rated paint to be used at 265oF. Is it possible to directly compare and select a marine paint based off NACE standards (Up to 300oF) since the salt spray test hour values do not represent actual conditions. User application is for a mineral-ore plant near...

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