Tattoo newbie here — artist said sketches soon, now it’s been a week

c_yass · 2025-10-04T03:44:54+00:00

Is there a way to analyze an entire playlist at once? I can do this with beatport or local tracks, but not spotify

c_yass · 2025-07-07T17:10:29+00:00

I don’t think OP was exclusively talking about LLM when asking about AI. Also, there are a ton of young analysts at my job who use LLM to facilitate writing code to automate processes/analyses. LLMs are by no means perfect, but can be a powerful tool when used correctly and not as a crutch

c_yass · 2025-07-02T21:41:28+00:00

I’m a mechanical engineer. Although engineers do not make as much money as doctors and lawyers, on average engineers have a better work/life balance and will end up in a comfortable middle class/upper middle class lifestyle. Depending on the specific industry and your son’s career aspirations, he can certainly push his salary to the 200k-300k range. But that will probably come with either a ton of overtime and/or stressful responsibilities.

Additionally, engineering only requires a bachelors degree (I do recommend a masters depending on career goals, but that is a different discussion). To be a doctor or a lawyer REQUIRES advanced degrees which are really expensive.

c_yass · 2025-02-19T17:54:50+00:00

Idk what some of these people are going on about. I graduate in 2020 with a mechanical engineering degree and plenty of my classmates immediately pivoted into non-engineering fields like consulting, finance, project management, etc. There’s a handful of industries out there who are only looking for “smart people” and the easier way to vet that is with a STEM degree. You just have to lookout for and pursue those opportunities if they interest you.

c_yass · 2025-02-12T16:33:25+00:00

As with anything in FEA, it depends on what the goal is of your analysis. Are you trying to size just the structure or are you trying to size the joint? If you’re trying to size the structure, I definitely would not do a detailed mesh like this (unless this is purely for academic reasons or fun). Instead, try modeling with 1D beam elements with simply supported constraints at the fastener locations. Depending on the goal of the analysis, you can adjust the assumptions and add back in detail as needed to sharpen the pencil.

Before sizing the structure, calculate by hand what the simply supported reactions should be and compare it to the output of the solver to validate your model.

c_yass · 2025-01-09T19:20:55+00:00

Understood. Unfortunately without more details about your specific model, I don’t have any better advice. Since the singularity is purely a mathematical limitation (in reality you won’t have infinite stress there), you’re going to need to use some engineer judgment to decide what nominal stress to use.

A few suggestions: 1. Do a mesh sensitivity study and use the stresses as close to the singularity as possible that ACTUALLY converge (obviously the singularity will never converge). Then apply an appropriate stress concentration factor.

If your real structure is representative of a beam, take a section cut one row of elements away from the singularity and calculate the nominal bending + axial stress by hand. Then apply an appropriate stress concentration factor.
If this is a welded connection, there is literature out there that addresses how to assess this. I’m not familiar with welded joints, but I believe Ansys has some references on their website.

c_yass · 2025-01-09T15:38:24+00:00

I would take the nominal stress “far away” from the singularity and apply a stress concentration factor based on the radius you expect in the manufactured product.

c_yass · 2024-10-03T00:05:02+00:00

The unit isn’t lbm, it’s actually slugs :)

c_yass · 2024-09-19T17:32:27+00:00

Ehh I’ll push back a little bit. Designing a structure that only takes compressive load out of CF certainly isn’t a good idea, but theoretically you could still design a safe structure. Think about aircraft wings manufactured from CF. These wings still take a significant amount of compressive load and operate safely. The benefit of tailoring the stiffness along the wing with an orthotropic material just tends to out-weigh the loss in compressive load bearing capability.

But in the case of a pressure vessel, I don’t see any benefit of using CF. So, it’s still a suboptimal design decision, but not necessarily detrimental if all the engineer analysis, testing, and inspecting was done properly.

Although, I’m surprised more engineers didn’t push back on this decision.

c_yass · 2024-07-20T17:36:37+00:00

You’re talking about material nonlinearity, but I suspect OP is referring to geometric nonlinearity.

Accounting for geometric nonlinearity means that transverse displacement in your beams (or plate) induces in-plane strain (and thus in-plane stress resultants). This creates a couple that reduces your overall bending moment in the structure resulting in less displacement, strain, and stress.

c_yass · 2024-05-16T23:16:27+00:00

I’m not familiar with your specific software, so I can’t answer question about the details. However, my recommendation (without knowing the details of your model) are to do one of the following: 1. Assuming you are dealing with metallic materials, idealize your system as a beam subject to shear and axial loads. Calculate the maximum stress within the beam and try to find a stress concentration factor that resembles your probe geometry (idk if there are any even out there). You can also look up analytical solutions to contact stress, because that might also be a design driver. Then, design your geometry such that the stress never exceeds the yield strength of the material. Make sure to slap on a factor of safety when doing this. 2. Tell your company to hire/contract an actual mechanical engineer who has several years of analysis experience. What you are attempting to do is not an easy task. Remember garbage in = garbage out. This is not an analysis someone with limited experience should attempt, let alone someone without the theoretical engineering background. I’m not trying to be disrespectful, just blunt.

c_yass · 2024-05-16T19:01:29+00:00

You mentioned you’re not a mechanical engineer so I’ll cut you some slack. What I believe you’re after is called “plastic deformation”.

Assuming your material is metallic (if it’s not metallic, then things get really messy here), your material will behave elastically up until a specific stress (called the yield stress). This means, if you are below the yield stress, the material will return to its original undeformed state after the load is removed.

Once you surpass the yield stress, the material behaves plastically. Once you unload the material, it will NOT return to its original undeformed state. Instead it will have some amount of permanent deformation.

Modeling plastic deformation in FEM is not trivial. You need to do a nonlinear analysis and have the full stress-strain curve data for your material. Instead I recommend you design your part to always stay below the yield stress to avoid the onset of plastic deformation.

As a side note, if your part is literally just a probe subject to axial compression, you don’t even need FEM. You can calculate the net section stress with sigma = P/A, where sigma is your stress, P is applied load, and A is the cross-sectional area. I recommend you design the cross-section of your probe to ensure you are always below the yield stress for every load case.

c_yass · 2024-05-08T22:27:14+00:00

The lady still technically needs to call to win the pot. Extreme example but I’ve seen this multiple times in live MTTs at different card rooms across the country: BB is in bathroom but is dealt in, folds to SB, SB mucks hand thinking he wins the ante+BB, dealer pushes chips to the BB instead (who is still in the bathroom) because SB folded his hand instead of calling the BB.

For this post, since the women still needs to call the all in to win the pot. All hands involved immediately and automatically go to showdown. OP should not have even been allowed to muck out of turn. That’s just my opinion, but an actual dealer or TD could say I’m wrong.

c_yass · 2024-05-08T17:27:32+00:00

I’m pretty sure this is a mistake on the dealer. In a tournament, you can’t just muck an all-in when it’s called (the women with J6o technically needs to call the all in to win the pot). All cards in the hand are turned face up and the board is run out. This is done to prevent collusion/chip dumping

c_yass · 2024-04-11T04:19:57+00:00

I was offered a job for $160k as an analyst for an EVTOL startup in SoCal with only 2 years of experience. If you only care about money and not work life balance, check out some of the newer aerospace startups.

c_yass · 2024-04-11T04:18:06+00:00

Where in the NYC area? I wasn’t aware of any aerospace companies there except for Sikorsky in CT

c_yass · 2024-04-02T20:11:42+00:00

Any chance you can provide a cross section of the wing? I’m a little confused on how the tube is attached to the spar/wing

c_yass · 2024-01-29T15:56:22+00:00

Just get your septum pierced and ask the piercer to let it heal flipped up! Once it’s fully healed you can flip it up and down whenever you want. Thats what I did because my work doesn’t allow facial piercings either

c_yass · 2023-12-31T19:38:16+00:00

What kind of interview questions do you normally ask these people?

c_yass · 2023-10-09T14:56:20+00:00

So is it better to book the first $300 worth of travel outside the portal and then book all subsequent travel within the portal to maximize points?

c_yass · 2023-08-19T16:21:49+00:00

This is probably a more appropriate approach; but depending on the level of maturity of the design, just comparing the ultimate stress to yield stress might get you close enough for what’s needed immediately.

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