Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  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...
  16. jball1

    Modeling strut with connectors

    Thanks. Yeah, that would work. The truth is I want to start using connectors more frequently in my models, and so I saw this as a possible opportunity to do so. Connectors have a lot of capabilities that I'm not very familiar with. But I don't really need them in this instance. I guess...
  17. jball1

    Modeling strut with connectors

    Apologize for the really basic question. I am modeling a strut acting between two points that has different releases on each end (fixed on one end, one moment released on the other). Do I need three connectors to represent the strut? One each to represent the releases on each end, and then a...
  18. jball1

    Seeking Career Advice

    I'm a mechanical engineer working as a structural analyst. In our department, mechanical or civil engineers with programming skills are highly sought after. My assumption was that this was true for most engineering fields, as the utility of programming becomes more and more obvious. Maybe...
  19. jball1

    Free-Free Preloaded Modal Analysis

    I'm not sure I fully understand the details of your problem. But you should be able to do a free-free modal analysis in Abaqus and get 6 rigid body modes. I've done it many times. I'm surprised that you can't do it in any program, which makes me think I'm not understanding the specifics of...
  20. jball1

    Can't edit a contact interaction

    That worked! Thank you for the help. Would have responded earlier, but I got moved off this job for a bit and am just now picking it up.

Part and Inventory Search

Back
Top