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Hi all, I have a scenario in which semi-high cyclical stresses have been found near a steel flange/tube connection via strain gauges. For reference, the OD of the steel tube is >2ft and the wall thickness is >0.25 inches. The steel flange bolts to something else, and I am expecting normal...

I am considering a partial penetration bevel weld that is subjected to both bending and shear loads. I am trying to decide which one of Blodgett's allowable fatigue stress categories applies, as there is a butt weld in tension allowable load and a shear loaded butt weld allowable load. How...

@rb1957: Gonna try it out! Also going to look at critical plane theory/method so I can understand somewhat how nCode might be pulling off the 'stress state' sorting I am alluding to above. Thanks!

Thanks geesaman.d. I am not exactly sure how I would reduce the complexity of my analysis, but I'll think on it.

Hi forum, I am currently trying to decide how to classify what I am up against, and how to rectify it.. Imagine a plate that has weights bolted to it, that is spun up to several hundred rpms (this is accomplished in ANSYS via rotational velocity BC), but also has cyclical torsional...

Do you guys know where the table here: https://roymech.org/Useful_Tables/Form/Weld_strength.html comes from? I haven't seen much allowance/calculation for butt/fillet welds in bending about its weak axis...

Hi centondollar, Sure I can try a nonlinear FEM then.. just leverage bilinear isotropic hardening? (I.e, one stiffness up to yielding, then a different one after yielding). Just so we are clear, the model is 3D, I just have the results scopes to the top face of the bottom box flange (where...

Hi folks, for what it's worth, the linear FEM stresses are intended to be corrected for plasticity using Neuber's rule (and eventually strain levels used in strain life assessments). And truthfully, since the FEM is reporting a positive principal stress, there is certainly a direction that is...

Just an FE problem at the moment, and yes, linear materials (frictional contacts of course).

Hi rb1957, The load is not really realistic... truthfully this model is a simplified model to replicate a problem encountered in a separate, much larger model. I just scaled it down to a model that was easier to show and explain.

No problem. and same here. This is truly the first time I have considered the clamped member... to a certain degree, maybe that should tell me something.

@desertfox, Thanks for the document. Unfortunately that seems focused on the fatigue of the bolt instead of the clamped material.

Sorry for my ambiguity... certainly this is a FEA "phantom" at the moment, however I could see a case where a fatigue crack could initiate in the indicated regions. And yep. it is big time messy on the stress state side. I do like the idea of thicker/bigger washers underneath the bolts of...

Thanks folks. Its certainly NOT something we have a lot of practice with (modelling bolted joints to an.... acceptable?..... accuracy.) We have a lot of history taking FE assemblies and extracting the force and moment reactions to gather an estimate on the fatigue life of bolts. Not so much on...

Howdy folks, In my FEA, I am encountering a scenario in which the bolted-on assembly is experiencing lateral load due to vibrations (should be a screenshot). As the top box tips over, the bolt head essentially "digs in" on one side and pries at clamped material. The peak principal stresses are...

hi rb1957, thanks for the reply. Yes, the analysis is linear... I suppose I could run the analysis NL and compare strain levels. I usually i am a bit concerned with NL analyses and castings since they are so brittle (not much room for plasticity) but in the case of singularities, I expect them...

Hello all, I have a scenario in which I am tapping m10x1.5 threads into cast iron close to an edge - ~0.120". (imagine a 2x2 that is 6 inches long, with a hole drilled in the end faces off-centered such that the edge of the hole is .120" from the sides). This distance should not move - it's...

Hi Tmoose, I suppose I should have specified. There’s really no way for side loading to occur in this joint - the clamp load should provide plenty of resistance to slipping/subsequent bolt/thread moments occurring . It would be nice to be able to quantify somehow, but not the priority. So I...

Hello all, I have a scenario in which I am tapping m10x1.5 threads into cast iron close to an edge - ~0.120". (imagine a 2x2 that is 6 inches long, with a hole drilled in the end faces off-centered such that the edge of the hole is .120" from the sides). This distance should not move - it's...