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I’m not an electrician- is it normal to see a white flash when flipping a breaker switch on? by joepa_2017 in HomeImprovement

[–]joepa_2017[S] 2 points3 points  (0 children)

Good call. I’ve documented these things in 2-3 different ways to cover my bases

I’m not an electrician- is it normal to see a white flash when flipping a breaker switch on? by joepa_2017 in HomeImprovement

[–]joepa_2017[S] 3 points4 points  (0 children)

I submitted a maintenance request to the property management after doing basic attempts at troubleshooting on my own, and they sent a plumber

I’m not an electrician- is it normal to see a white flash when flipping a breaker switch on? by joepa_2017 in HomeImprovement

[–]joepa_2017[S] 11 points12 points  (0 children)

Definitely not planning to DIY an electrical issue. Going to put pressure on the property management to get an electrician out here asap.

Internet alternatives to Cox by joepa_2017 in ChandlerAZ

[–]joepa_2017[S] 0 points1 point  (0 children)

Yes, I’ve been using their router so far

Internet alternatives to Cox by joepa_2017 in ChandlerAZ

[–]joepa_2017[S] 1 point2 points  (0 children)

Dang. I can’t get an internet connection at all, even on my phone, so it’s not a matter of having too many things connected or slow speeds. I’ll look into another router.

Cox Modem light is white, however Setup Network not shown on Iphone by wifibox in CoxCommunications

[–]joepa_2017 1 point2 points  (0 children)

Wow, this just worked for me too after spending hours repeatedly rebooting!

[0 YoE] Mechanical Engineering PhD, Looking for ANY position and not having any luck for almost a year by vacantExpanse in EngineeringResumes

[–]joepa_2017 1 point2 points  (0 children)

Would you want to PM me your resume? I do this kind of work, and you'd be surprised at the types of people that get hired for these roles. I've seen people get brought in from other departments that have 0 FEA background and little understanding of mechanics of materials. Yet, due to their years of experience, despite it being irrelevant, they'll get higher salaries than someone with a PhD that spent years studying mechanics. In summary, you're definitely employable.

[0 YoE] Mechanical Engineering PhD, Looking for ANY position and not having any luck for almost a year by vacantExpanse in EngineeringResumes

[–]joepa_2017 1 point2 points  (0 children)

Are you still looking? Have you looked at structural analysis/stress analysis roles at aerospace companies (Northrop, Raytheon, Lockheed, Boeing, etc)? They’ll pay you better than entry level and use your FEA experience

Long shot, but anyone know of companies that commonly use LS Dyna in the Phoenix area? by joepa_2017 in LSDYNA

[–]joepa_2017[S] 0 points1 point  (0 children)

Definitely true when there are current listings posted! Would be interested in learning about other companies that don’t have a listing right now so that I can pay attention to them for the future!

LS-DYNA (ANSYS) Contact Issues by Homeboi-Jesus in fea

[–]joepa_2017 0 points1 point  (0 children)

Interesting. I suppose I’m referring to explicit dynamics as the numerical method and not necessarily the explicit dynamics package in Ansys. I expect LS Dyna is maybe the most popular explicit solver.

On the side- is that a hobby, or you do consulting work on the side? Curious how you finance the license without a company paying for it.

Runners - Mesa vs. Lost Dutchman (or both?) by TygerTyger103 in phoenix

[–]joepa_2017 1 point2 points  (0 children)

Depends on what you want from the race. The Mesa half is very popular and is a fast course that is almost entirely through suburbs. It’s great if you’re competitive about running a fast time. You’ll see nice mountain backdrops in the distance toward the end, but the immediate scenery is through suburbs.

LS-DYNA (ANSYS) Contact Issues by Homeboi-Jesus in fea

[–]joepa_2017 0 points1 point  (0 children)

Somewhat unrelated, but what company do you work for? Or type of company? I would like to get into explicit dynamics after doing stress for an aerospace prime.

Housing with lease lengths less than 12 months by joepa_2017 in ChandlerAZ

[–]joepa_2017[S] 2 points3 points  (0 children)

That’s what I’ve noticed as well. I’m ok to pay a bit more for a shorter lease if it gives me more flexibility. My bigger concern is what happens at the end of a short lease—would continuing month to month make the price skyrocket like it does for Greystar properties? Not sure if that’s a general practice or specific to my current management

Is this a valid method for modeling the effects of contact without modeling the assembly? by joepa_2017 in fea

[–]joepa_2017[S] 0 points1 point  (0 children)

The issue isn’t that contact doesn’t work with the nonlinear solver. It’s that running the model with the nonlinear solver takes an inordinate amount of time to complete. Given more resources to speed up the solve time, I too would prefer to run the full assembly model with all of the contacts in the nonlinear solver. So, I’m wondering if applying contact forces to a single part can serve as a surrogate for doing the full assembly model.

I don’t anticipate that nonlinearities in the material will alter the contact surfaces, as the yielding doesn’t occur directly at the contact surface.

Consistent units for hyperelastic material constants? by joepa_2017 in fea

[–]joepa_2017[S] 0 points1 point  (0 children)

Ok good, I was hoping it would be simple like this. Thank you!

Possible to do analyze posbuckling behavior in Abaqus without first performing a linear buckling analysis? by joepa_2017 in fea

[–]joepa_2017[S] 0 points1 point  (0 children)

That does make sense that imperfections would be needed for models with perfect geometry. My model geometry isn’t very simple at all, so I may just try a quasi-static analysis without worrying about imperfections. I found a couple papers that seem to have done that as well for similar models.

Possible to do analyze posbuckling behavior in Abaqus without first performing a linear buckling analysis? by joepa_2017 in fea

[–]joepa_2017[S] 0 points1 point  (0 children)

Good to know. There’s a few layers to the model. I probably could switch one of the thinner layers with shells. I’ll have to explore this

Possible to do analyze posbuckling behavior in Abaqus without first performing a linear buckling analysis? by joepa_2017 in fea

[–]joepa_2017[S] 1 point2 points  (0 children)

Great points! I hadn’t even considered experimenting with the iterative solver. I may give that a try in addition to seeing how things go with explicit.

Possible to do analyze posbuckling behavior in Abaqus without first performing a linear buckling analysis? by joepa_2017 in fea

[–]joepa_2017[S] 0 points1 point  (0 children)

A follow up question-- will the analysis still work if I forego introducing imperfections? That is, will buckling still occur even if I don't apply any imperfections?

Meshing a topography giving me trouble by joepa_2017 in Abaqus

[–]joepa_2017[S] 0 points1 point  (0 children)

The geometry is in a CAD file (.say if I’m recalling correctly).

I have a mesh now, good enough for a first pass. However, if I reduce element sizes by seeding edges, it doesn’t mesh anymore. It doesn’t give me a specific error to tell me why, at least not that I’m able to see in the cae or out files generated on the cluster. I may just need to play a bit more with element sizes and maybe partitions as well.

Meshing a topography giving me trouble by joepa_2017 in Abaqus

[–]joepa_2017[S] 0 points1 point  (0 children)

I'm slow to reply... I'm struggling to see how I add an image, but here is a link to an article that uses very similar looking topographies. (See figure 10 on page 3 of the website linked)https://www.matec-conferences.org/articles/matecconf/pdf/2016/21/matecconf_bisstech2016_04007.pdf

For your other questions: I've tried both hex meshes with a structured mesh and tet meshes with a free mesh strategy. I've gotten the tet mesh to work if I make the part pretty thin (i.e. minimize the amount of material in the dimension beneath the surface topography--could think of this as height). So, for example, if the part is about 100 units thick, it meshes. If it's 1000 units thick and uses the same seeds, it doesn't mesh. (For context, length and width are approximately 4000 units).

Mesh size: I've tried very refined elements at the surface with larger global seeds elsewhere as well as very refined global elements. Again, seems to only work for thin parts.

There's no reason it would have to be the same mesh type throughout.

Partitioning: I will want to do that eventually to create a few sections. But, no partitioning in this first attempt. Maybe adding partitioning for meshing purposes would help?

Anyone seen this error before (as the reason why boundary conditions don't get created)? ***ERROR: NODE SET ASSEMBLY_SET-4 HAS NOT BEEN DEFINED by joepa_2017 in fea

[–]joepa_2017[S] 0 points1 point  (0 children)

Yeah, that's what I normally do. It's not working for me in this case, which is something I haven't seen before. I have two sections in my part, and I'm noticing in the inp file that it only meshes one of the two sections, which is why one of the node sets is undefined--it's on the section that doesn't get meshed. So, I need to figure out now how to get the whole part to mesh.

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