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  1. julian89

    Load factors when conducting an elastic-plastic FEA in accordance with EN 1993-1-5

    Hi all, I have begun to look into performing FEAs in accordance with EN 1993-1-5, and was a bit puzzled by Annex C of this standard which provides the rules. It allows the engineer to use any material model from linear elastic up to full elastic plastic, but does not mention any load factors...
  2. julian89

    EH 26 TI

    Hi guys, I recently came across a material which I have never seen before in an old boiler. Name: EH 26 TI Standard: VD/TUEV 478/1. Does anyone know where I can find mechanical data on this material in a modern standard? What grade material does this correspond to? Thanks
  3. julian89

    Separation moment of API connection

    Hi guys! I recently got asked by a client at what bending moment joint separation will occur (with and without internal pressure). API 7G gives clear rules for calculation of separation tension (Eq. A.19), but as stated in A.10.7: "A.10.7 CAUTION: The loads considered in this simpliÞed...
  4. julian89

    Trilinear interpolation in mathcad prime?

    Hi all! I'm attempting perform linear interpolation with 3 independent variables, like so: The goal is to extract the rows corresponding to d0..d3 based on the inputs a, b and c. Here is a simple test data set that I have put together: Excel sheet here I have done interpolation with 2...
  5. julian89

    Fatigue calculations of large, non-pretensioned trapezoidal connection subject to bending moments

    Hi all, I'm about to embark on 3D, pretty large scale, finite element calculations of a large assembly for subsea operations. In this assembly, there are a couple of large threaded contacts (think pup joints and X-overs). For strength calculations, I can either do this by hand or in a finite...
  6. julian89

    Units T and M.T in nozzle load list

    Hi ladies and gentlement, I recently stumbled upon a drawing from 1997 with units of nozzle loads stated as "T" for force and "M.T" for moments. The vessel is delivered by Babcock. Are these given as tonnef and.. tonnef × meters? Any one familiar with this notation? I haven't seen this...
  7. julian89

    Fracture mechanics analysis with residual stresses using FEA

    Hi guys & girls, I'm trying to enter the world of fracture mechanics of pressure vessels using FEAs. The first challenge I've encountered now is how to include residual stresses at weld beads? An example of what a residual stress may look like (from API 579, Annex 9D): I've also...
  8. julian89

    Bending capacity of pipe: Conversion from degrees/100 ft to kNm

    Hi all! I simply wish to convert a given bending capacity given in degrees/100 ft to kNm. How to do that? Thanks! Jules
  9. julian89

    Design of heads with FEA (ASME VIII-2)

    Good day gents, I about to embark on something I have never done before, which is design of a semielliptic head (2:1) via FEAs (I have only used DBF before). The head is to be designed for internal pressure and external pressure. There are a number of failure modes to investigate in both the...
  10. julian89

    Tresca vs. von Mises

    Good afternoon ladies and gentlemen, Consider a case whereby a vessel has been designed in accordance with ASME VIII-1. At a later stage, due to local metal loss for example, the vessel is re-evaluated in accordance with ASME VIII-2 part 5 rules with an FEA. As we know, Div. 1 uses Tresca and...
  11. julian89

    Does ASME VIII Div. 1 have requirements for normalization/annealing after cold forming?

    Good day ladies and gentlemen. I recently stumbled upon a case where a part (low carbon steel) was cold formed from plates with a resultant strain of more than 5%. The part was therefore subject to heat treatment, but in ASME VIII Div. 1 I cannot find anywhere that normalization/annealing is...
  12. julian89

    Estimating strains of buckled shape using ANSYS

    Good day ladies and gentlemen! Say one has a buckled tube (or any other component for that matter), and want to estimate the strains present, how would one go about that using FEA? My attempt, as it stands, was to do a buckling analysis with, with a proper scaling, such that the shapes of the...
  13. julian89

    Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?

    Hi guys, I was wondering if it is permissible to supplement or replace calculations done in accordance with Div. 1 with Div. 2 (or visa-versa)? E.g., if a single part does not satisfy the requirements of Div. 1, is it possible to perform calculations for that specific component in accordance...
  14. julian89

    Bending stress from 2 bending moments in different planes

    Hi! The problem is the same as this (though with a circular cross section): Link How to calculate this? Do I take the resulting moment vector and calculate bending stress, or calculate both separately and add them together? Thanks for any help!! :)

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