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Recent content by jball1

  1. jball1

    Accumulation of error in Abaqus Explicit?

    Actually would you mind pointing me to those numbers in the Abaqus documentation?
  2. jball1

    Accumulation of error in Abaqus Explicit?

    Thanks, I have never noticed those specific numbers of increments in the documentation. That is very helpful.
  3. jball1

    Accumulation of error in Abaqus Explicit?

    I am performing an analysis of an event that takes between 0.1 seconds and 1 second. My stable time increment is usually between 2E-7 and 5E-6. In the past, I have used Abaqus Implicit to solve this type of problem. I believe I was told at one point that Implicit methods are generally better...
  4. jball1

    Fluid filled structure: Implicit transient *Dynamic analysis possible with ABaqus-Standard

    Glad to hear it!
  5. jball1

    Fluid filled structure: Implicit transient *Dynamic analysis possible with ABaqus-Standard

    "Acoustic" fluid assumes incompressibility by definition. If you want to include compressibility effects, you would use other methods. Sounds like acoustic is the way you want to go.
  6. jball1

    Fluid filled structure: Implicit transient *Dynamic analysis possible with ABaqus-Standard

    If the analysis is literally as simple as a fluid filled container loaded via base motions and you are only interested in the structural response (i.e. not interested in complex fluid behavior), I would treat the fluid as an acoustic fluid and use AC3D8 elements for your fluid mesh. This can be...
  7. jball1

    Assessing Plug Welds with Blodgett Line Method

    Thank you. This is helpful!
  8. jball1

    Assessing Plug Welds with Blodgett Line Method

    I am evaluating a plug weld joint using loads from FEA. I would like to apply the Blodgett line method, if possible. Tables 6 and 7 in Blodgett (pg 7.4-8) seem to indicate that this is permissible? I am struggling with calculating the section properties though, since the welds are...
  9. jball1

    Extracting nodal forces

    All set. I can get NFORC and the free body tool to match. Looks like if I use the summing tool (field output/save as), it only counts the average of the two nodes of adjacent connected elements, instead of including them both. Not sure why they would do it this way. But anyways, I can at...
  10. jball1

    Extracting nodal forces

    I have multiple perpendicular plates throughout my model that are modeled with shells that are tied together (like the web and flange of a T-beam). The tie constraint represents welds. I would like to extract forces and moments at the nodes on the interface at the location of each weld, and...
  11. jball1

    Connector Damage/Failure

    You probably know more about this than me, but it also might be the case that our industries differ in our approach to assessing fasteners, simply because we are focused on different loading scenarios. In aerospace my assumption is that you are much more focused on fastener failure due to...
  12. jball1

    Connector Damage/Failure

    This thread relates to the consideration of combined loading on fasteners: https://www.eng-tips.com/viewthread.cfm?qid=265633 It'd also probably be helpful to add that this is a severe load case where preload is overcome. The tensile force that is included is due to externally applied loads...
  13. jball1

    Connector Damage/Failure

    FEA way, thank you, I was thinking the same thing (beam elements). I would have to make some different modeling choices elsewhere in my model to support beam elements, but it looks like I may have to do so. Without going into too much detail, this is a fluid structure interaction problem, and...
  14. jball1

    Connector Damage/Failure

    I have a model that includes several bolted joints. In this model, I have modeled the fasteners with connector elements which have the three translational stiffnesses defined (two shear, one axial). This is a transient analysis. I am predicting failure in a minority of the bolts in two of...
  15. jball1

    Static vs dynamic application of load

    I typically evaluate large steel structures subjected to severe, dynamic loads. The loading is severe enough that it is not uncommon for our analyses to predict significant plasticity. Because the structures are large and complex, we typically use a global/local approach for evaluation of...
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