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  • Users: barrind
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  1. barrind

    PD5500 - Pressure Vessel Repair Proposal

    We have a vessel which is corroding internally. Apart from the general overall loss in wall thickness there are a few quite small areas were deeper pits have formed, and have been mapped with a corrosion mapping technique. In the past one or two of these have developed through wall thickness...
  2. barrind

    Minimum thickness in taper zone of hemipsherical head?

    We have a vessel designed to PD5500. It has hempisherical ends which are connected to the main cylinder in a fashion identical to the bottom picture on page 3/210 (page 268 in the pdf version) of PD5500:2009, i.e. the hemispherical end is thinner than the cylinder and with the median lines of...
  3. barrind

    BS 7608 fatigue design equivalent for welded copper pipes?

    I need to do some fatigue life calcs for butt welds in copper pipework. If it was steel I would follow the guidance given in BS 7608 which contains S-N curve data for various weld configurations in steel. Is there a similar standard available for welded copper structures? If not how would the...
  4. barrind

    Weld stress analysis using axisymmetric model

    I'm after some guidance on how to analyse welds based on stresses derived from an axisymmetric model. Basically the shape I am modelling is a can under internal pressrue with top and bottom covers fixed by single sided fillet welds. The designers have asked for confirmation that the weld throat...
  5. barrind

    Best practice for modelling refractory lined pipes for stress analsis?

    What is the best practice for this, or should I say, most efficient practice? Modelling the steel and refractory as either a composite shell or as a solid seems tricky to me due to getting the properties of the refractory right and how it should interact with the steel shell. I have read that...
  6. barrind

    More sophisticated wind loading on cylindrical structures?

    In the past we have applied wind loading on cylindrical structures by applying the equivalent dynamic pressure on a flat plate of the same projected area as a surface traction load on the wind facing half of the model. This pressure is derived from BS6399. We have basicaly used to standard to...
  7. barrind

    Applying displacement BCs to nodes

    Not sure if I am going to be able to explain what I want here, but here goes. I have a model, part of which I need to remesh to get a much finer mesh. Try as I might I cannot get the seeding right for the mesh to propogate properly and give me a nice coarse mesh far away from this region using...
  8. barrind

    Idiots guide to setting up Abaqus to use dual core cpu?

    We recently upgraded our FEA pcs to dual core xeons running XP64bit and Abaqus 6.6-5 64 bit version. I know there is some info in the Abaqus installation manual but to be honest it seems a bit techie jargon heavy. Given the setup I describe above can someone tell me which files to edit how to...
  9. barrind

    Force required to fracture a rail?

    We had an incident where part of a suspended rail fracture suddenly. The fracture face is totally brittle, i.e. no fatigue cracking, and no evidence of obvious pre existing flaws. We think this was due to massive overloading, though no one will own up to what happened. I have been asked to give...
  10. barrind

    What boundary conditions for column buried in ground?

    I have to model the effects of an impact on a structure. The structure is basically a frame of vertical columns with horizontal bracing. The vertical columns are set in conrete block foundations approx 1m cubed, such that the top level of the concrete block is level with the ground surface. My...
  11. barrind

    Need thermal conductivity of EN43B steel

    As title I need the thermal conductivity property of EN 43b steel, also known as EN 10025-1 S275 G2 JR Can someone help me or point me in the right direction?
  12. barrind

    Impact load between loco and bogie?

    We need to measure the impact load between a loco and a bogie during a normal shunting operation. Its been a long time since I had to think about anything like this, I was thinking about placing accelerometers on the loco and bogie to measure the peak longnitudinal g, assuming a straight shunt...

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