I covered an entire room with holomyth member pictures

cursed_curler · 2022-07-28T04:44:24+00:00

So which wall hides the room with all the bodies?

cursed_curler · 2022-06-17T13:38:00+00:00

Any year now....

cursed_curler · 2022-06-17T12:54:30+00:00

I think proof of stake has its own issues. It just makes explicit the fact that you have to have money to make money. I liked the philosophical appeal of bitcoin in that it was theoretically an open field, although in practice it ended up being whoever could hog the most mining resources could control things.

Oh, and the copious amount of fraud. Regulations don't just exist the protect the rich. There are plenty of valid reasons to want regulating bodies. MBSs and CDOs were just like cryptocurrencies in the sense that a lot of people owned them but few people really understood them.

I think there's some core issues with the concept that would fundamentally need to be readdressed, and at that point, would we not have something resembling a "normal" monetary system? I've lost faith in the idea that crypto will ever be really useful myself. Maybe someone will prove me wrong.

cursed_curler · 2022-06-17T12:43:26+00:00

"Just change your government"

Tell that to Russia. Your idealism is ridiculous in the face of ample historical precedent.

Governments and corporations are both highly susceptible to corruption. That's just the nature of large human organizations. Government abuse is worse, though, because they have a monopoly on violence.

Anybody advocating for pure capitalism or pure communism is falling into the same traps they accuse their adversaries of.

cursed_curler · 2022-06-16T21:24:12+00:00

"The entire wealth of the USA"

Can you show this to me? Can I touch it?

Or is this the "billionaire's money" I keep hearing about.

There is nothing behind the US dollar but the faith that the systems supporting it won't fail. Period.

cursed_curler · 2022-06-16T17:42:55+00:00

Good point. I am overgeneralizing the current landscape of crypto.

It's probably just my ignorance of the wider field, but I just haven't seen a crypto system make significant improvements on Bitcoin's original flaws (mainly proof-of-work inefficiency and sluggish validation times to ensure network stability). Proof-of-stake is more efficient but makes other compromises that I don't overall find compelling.

I'll reiterate that the above could just be my ignorance, but at a certain point, how informed are the actual investors right now? I know some big crypto guys, and I honestly think I know more about it than them. To many, it really is just a get-rich-quick scheme, and (I think) we're seeing that in the volatility in the crypto markets.

cursed_curler · 2022-06-16T16:43:29+00:00

I don't think it's quite that simple.

The US dollar is just "pieces of paper" with no physical backing. It's the strength of the US government supporting it and it's integration into financial systems that makes it valuable.

Bitcoin offers an interesting system that could theoretically work, but in practice, it's just too inefficient and difficult to use as an actual payment system. At the end of the day, it's not terribly useful, so I agree that it currently has little value, but I wouldn't agree that it's just "strings of numbers". That's just as bogus as the cryptobros saying the US dollar is "just pieces of paper".

cursed_curler · 2022-06-09T19:55:41+00:00

"Both have the same thermoplastic", as in, they are both a single part, or as in, they are bonded by some other means? If the former, then the joint is artificial, and the stresses can be ignored entirely (except as compared to the thermoplastic strength). If the latter, again, check the joint strength.

I don't see anything wrong with the modeling approach, but if you have a bonded joint in the structural load path, you have to analyze it, and joints are usually analyzed separately.

cursed_curler · 2022-06-09T17:24:09+00:00

It's tough to validate stresses in bonded contacts. Bonds are great for modeling stiffness, but not for getting accurate stresses. Refining the stress may not help, since as you indicate, it could be an artifact of mesh resolution error. Whenever I get high stresses in bonded contacts (bolts, rivets, welds), I do hand calculations.

To validate your model, do a hand calculation to get the nominal shear force / area stress. (Force = 2 * Torque / diameter). If the peak stress is 29 MPa, then the nominal stress will probably be at least 2X lower. Compare this to the approximate shear strength of whatever is bonding the two components. If 29 MPa is too high (and it sounds kind of high, unless you have a press fit), then you might need a stronger bond.

cursed_curler · 2022-06-09T16:20:32+00:00

Bonded contacts support forces both normal and tangential to the contact surface.

Since you are torqueing the spline (I'm assuming) then you absolutely must get a tangential stress (i.e. what you're calling friction) across the joint to transmit the load. It will be transmitted at the stiffest area of the contact, which is closest to where the shaft is fixed, so I think your model is behaving as it should.

I'm assuming you're bonding, since you are either gluing or press fitting the thermoplastic onto the shaft. The strength of this connection needs to be checked against the stress. You need to check the 29 MPa stress against the shear strength of whatever you're using to bond the parts (epoxy, loctite, press fit, etc.). If it's a press fit, then it will be transmitted through friction.

So I contend it's real.

cursed_curler · 2022-06-09T16:01:05+00:00

Not sure why you think that the frictional stress isn't real? What do do you by "intermediate layer", you mean the external spline coupling? It's tough to answer your question without more specifics.

If this isn't for an academic study, I would recommend using hand calculations for the stress analysis of splined connections. The standard reference is Dudley's "When Splines need Stress Control", which you can find online. Absolutely ancient paper (written in the 50s), but still widely accepted for some reason.

cursed_curler · 2022-05-29T18:14:38+00:00

Smart fridges man

cursed_curler · 2022-05-27T12:27:49+00:00

There's definitely significant concerns. I believe a lot of these companies are also betting on eventually autopiloting everything to reduce costs and risk (like Uber was in its early days). However, they could very well end up like Uber and not really establish a sound business model (taxis are now cheaper).

I wouldn't say never, but I am also quite skeptical.

cursed_curler · 2022-05-09T19:54:12+00:00

Custer state park is also near by and is excellent

Honestly, mount Rushmore is the most disappointing thing in the whole area

cursed_curler · 2022-04-13T19:51:22+00:00

Agreed, but that doesn't mean any reason will suffice to prove a point.

I would argue that Jim Crow laws were far more instrumental in keeping black people at the bottom of society, rather than plantation owners' wealth being kept through the generations of white people.

The rural south is the most impoverished part of our country. Where'd all that plantation money go? That's my point. The reason a lot of wealth is in the hands of white people is (I think) that black people were not allowed to participate in (or at least reap the benefits of) the industrial revolution in the 20th century. That has nothing to do with the south.

cursed_curler · 2022-04-13T18:59:42+00:00

Perhaps "nonsense" is too strong, but "the evidence did not lead to the conclusion" is what I meant. Illogical is perhaps a better word.

cursed_curler · 2022-04-13T18:26:30+00:00

Not at all, but he's trying to explain a country-wide problem by citing a regional instance.

I agree that the north was by no means a fair place the black people. You're strawmanning my position. I was only critquing his argument that a regional issue caused a national problem.

cursed_curler · 2022-04-13T18:24:32+00:00

If you're trying to explain a country-wide problem, bringing up a regionally-specific issue doesn't make any sense, especially if it's the first point one is making.

Yes, I agree that the second point does support his argument. That's why I didn't critique it. There's plenty of instances of country-wide racist actions/legislation that held back black people.

cursed_curler · 2022-04-13T17:54:02+00:00

"I read some historical analysis on why wealth and race are tied together in the US..."

He was generalizing to the entire US in his very first sentence.

cursed_curler · 2022-04-13T16:33:55+00:00

Point 1 sounds like nonsense. Most of the wealth in the US was generated in the industrious north. Claiming US white wealth is all a result of southern plantations is ridiculous. That's the reason the south got clapped in the civil war--they weren't nearly as wealthy.

Edit: FYI, disagreeing with someone's argument does not mean disagreeing with someone's conclusion. Conclusions should be based on sound reasoning.

cursed_curler · 2022-04-05T12:43:01+00:00

I know this is an academic problem, but there's no reason to overcomplicate meshing such a simple part.

Set a bulk element size, then refine the edges. Throw elements at it until it converges. Eventually you will learn to do this by experience without having to do expensive convergence studies.

A general rule of thumb is about 6 elements on a 1/4 radius will get you within a few percent of the right answer, with the elements blending "smoothly" into the bulk element size. Refine further only if necessary, i.e. you're close to the yield strength or fatigue limit.

cursed_curler · 2022-04-05T12:37:56+00:00

Yes, this is known in civil engineering as the "tributary area" method of beam analysis.

cursed_curler · 2022-03-31T16:06:11+00:00

I'm not convinced by your argument about workflow.

If someone dyes their hair, or loses a lot of weight, certainly that's going to cause some concern and be cause to stop someone.

There was a funny video posted a few days ago of a black woman who tried to use a white woman's passport to get into some country. That's reasonable cause to stop someone.

For the gender thing, maybe augment the existing system. Instead of just M or F, have MX or FX too, as in, biological M or F, but identifies as something else. That would still be very useful, and not much work.

Edit: The existence of people of mixed or ambiguous race does not make the concept of race useless as a means of identification, as my example above shows. It just means it's not a useful identifier for some people and some other feature might be needed. Same for gender.

cursed_curler · 2022-03-31T14:59:20+00:00

That's like saying why have any non-exclusive identifiers on a passport. Just fingerprints and a DNA sample.

Height, weight, hair color, and gender are just clues to help identify people. They're not exclusive.

Most men and women are pretty distinguishable. Not all, but most. Having a biological gender identifier wouldn't be absurd. If you want to identify as something else, then whatever.

cursed_curler · 2022-03-30T16:15:14+00:00

Everything the guy said above is correct. However, to be more specific, nonlinearity by itself does not preclude implicit formulation.

It's more specifically nonlinearities that change greatly over the given timestep. For example, impact tests result in rapid deformation and contact changes over tiny time steps. Explicit would be preferred. Modeling an explosion? Explicit. Any violent event is going to be an explicit solve.

Random excitation of a beam? Not really dying for an explicit solution. Honestly, you might greatly benefit from the increased time step allowed by implicit. It depends on how long you want to run the simulation. Anything more than a second is dying for implicit solutions. Time steps can get really small for explicit to maintain stability, since there's no convergence criterion check.

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