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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...

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...

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...

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...

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...

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...

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...

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...

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...

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.

It is simply greyed out. I am using Kinematic contact with small sliding. When I spit out my input file, the *Clearance keyword is there. But I can't seem to get rid of it in CAE. I am using Abaqus 2019.

I created a contact interaction in CAE. Now I can't seem to edit it. Specifically, I can't edit the initial clearance, which I have set to "Uniform value across slave surface: 0". I want to remove this initial clearance. However, it is not an editable field now, for some reason. I am trying...

FEA way, thanks for the good questions - always important to check results! I mean a regular tie constraint (see below). I have a version of this model that is partitioned at every node to create vertices there. Results from this older version of the model match results from my current model...

Someone shared with me a way to solve my issue. I was able to create attachment points at the locations of the nodes being attached (one set of points for each of the two plates being attached). I then created connectors between the two sets of attachment points. Finally, I used tie...

Ok, thanks. I have an account but our company is currently having trouble with our account. This gives me an excuse to ping on the guy who is supposed to be fixing our access... I currently have a model of this assembly where I use "CONN3D2" connector elements. They connect directly to...

I would like to define the stiffnesses in each direction, so I don't think MPCs will work, unfortunately. I can do springs, but defining 4 springs (axial, 2 shear, moment) for each bolt is pretty tedious. I'm bummed that connectors won't work. That seemed pretty promising.

Thank you, that makes sense. I feel dumb, but I can't seem to get to the knowledge base article you mention. I am logged in at support.3ds.com/knowledge-base/. When I search for any combination of the words in the title you mentioned, it comes up with nothing. I get "Your search for XXX...

I am trying to use Abaqus’s “point based fasteners” to model a bolted connection which connects two large structures with 200 bolts. This is a dynamic analysis of a large structure. I can't significantly refine my mesh in way of the connection or the problem will become prohibitively...

I actually just figured it out. One of my coworkers who is a lot more knowledgeable than me explained that the math Abaqus does when defining individual lamina properties and orientations is very complex, and his guess was that it can just get through those calcs with 32 bit math (single...

I am attempting to run a dynamic analysis of a large composite structure. I am getting an “Exception_Access_Violation” error when I try to datacheck the model. The error seems like it is related to a specific composite section definition that I am trying to use. The structure is...