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  • Users: sdra2
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  1. sdra2

    Weld assessment for lifting beam

    Hi, I was wondering if someone could please guide me on how to calculate the stress levels in the welds (the one shown in yellow and its opposite on the other side) for this gusset. Each of the smaller beams is to lift with 15t each end. On the larger beam, two chains from the two upper lugs...
  2. sdra2

    EN ISO 13849-1 MTTFd

    Hello In this standard, safety-related parts of control systems, what does the 'd' of MTTFd mean? I know it means "dangerous (failure)", but it also talks about a safety system failing to operate. If a safety system failing to operate places the machine it is protecting into a default safe...
  3. sdra2

    EN 13445 - Copper

    Hello Does EN 13445 pressure vessel code cover copper alloy fabrications? I see that PD5500 does, as does ASME. Hope someone can help.... Thanks
  4. sdra2

    Autodesk Inventor Routed Systems

    My company is looking at purchasing this software. We currently have seats of Inventor where we can create pipes, adaptive or otherwise, with 3D sketches. Could anyone offer some experience-driven opinion please on what there is to gain from upgrading: for example, what can you do with Routed...
  5. sdra2

    Small pump for liquid pentane

    Apologies for such a non-specific post, but I am essentially trying to assess the feasibility of something I know next-to-nothing about. I am, in essence, after a pump to move liquid pentane in a (very small) closed loop system:- Metric: 194m head, 3.6m3/hr (or 1 litre per second) Imperial...
  6. sdra2

    Drawing numbers and part numbers

    I hope I've submitted this in the right place - seems the most relevant... I have a simple sounding question - is there a preferred system for numbering drawings and/or parts? I have in the past used a system where the part number gave information about what the part itself was, another system...
  7. sdra2

    BWR equation of state

    Does anyone know where I might find a worked example using this specific EOS? I have made a spreadsheet for using it to calculate thermodynamic data (I am not a thermo guy, by the way) but the answers it gives me don't appear to make sense. I'm only really hunting for a mistake in my...
  8. sdra2

    Scroll compressors - sharp corners at bottom of labyrinths

    I have had cause to look at a couple of stripped down scroll compressors (from two different manufacturers), and in both instances it was noticed that at the bottom of the labyrinth profiles, on both the stationary and moving part, there are sharp corners. By sharp, I mean almost non-existent...
  9. sdra2

    Aluminum 2618 alloy - T6 vs T8 temper

    I have an application where it has been determined that 2618 aluminum alloy is the prime candidate material for high fatigue life at elevated temperature. This decision was largely based upon fatigue data (at elevated temperature) for 2618 with a T6 temper (wrought stock material, not bespoke...
  10. sdra2

    Minimal support - 2D Axisymmetric Model

    Hi I have some experience in applying 3-2-1 supports for 3D FEA models to remove rigid body motion in analyses, and am trying to replicate the idea for a 2D axisymmetric model. I have geometry in the +x, +y quadrant of the XY plane. Within the model I have constrained 2 points along a line...
  11. sdra2

    Grey Cast Iron And Permanent Deformation

    Hello. I have seen a number of stress-strain curves for grey cast iron indicating permanent deformation after application and removal of a load. In all of the instances I have seen, however, the first load application gives rise to a stress that is some significant proportion, say 40% or more...
  12. sdra2

    Ansys Workbench And Inventor Question

    Hello In the help system for Ansys Workbench 11, it says that you can now attach surfaces from Inventor models - I'm fairly sure that at release 10 this couldn't be done at all. The above statement may well be true, but I cannot for the life of me figure out how to generate a 2D surface model...
  13. sdra2

    FEA Stress Results At Notches For Grey Iron Castings

    I have a number of questions regarding stress analysis of irregular geometry in grey iron castings. (1) How can I evaluate the theoretical stress concentration factor (using FEA techniques in my case) for irregular geometry? I have read that for, say, a simple bar in tension with a notch...
  14. sdra2

    Stress concentration / grey iron / elasticity

    I have a number of questions regarding stress analysis of irregular geometry in grey iron castings. (1) How can I evaluate the theoretical stress concentration factor (using FEA techniques in my case) for irregular geometry? I have read that for, say, a simple bar in tension with a notch...

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