...no matter how beefy you make an aluminum part, after enough cyclic stresses it will suffer fatigue failure.
You realize that chart has a log scale, right? It is not a matter of designing for infinite life, it is a matter of designing for "infinite enough". This is how they make aluminum engine blocks and heads. Sure it will fail in fatigue eventually. But after 50 years or so, it is time to replace the dern thing anyway. In other words, fatigue strength is just one more variable to design around. Even if the part was made from titanium or steel, they still might make the decision to not design for "infinite" life due to other overriding design considerations. Weight, for example.
The concern with the wheel design was not fatigue itself, but rather a higher peak load during the fatigue cycle. The wheels were not designed for the type of terrain they landed on. More bad luck than bad planning because the type of terrain they landed on had not been observed on Mars before.
In my experience, it is very difficult to successfully design for conditions that have never been observed before.
I cry every damn time I read that one. And I don't care who knows. Heck. I cry just reading the wikipedia entry for Spirit.
That collection of nuts, bolts, and solar panels did more with less and used up every last bit of its capability in the pursuit of its mission. Yes I know I am anthropomorphising a bit (a lot), but I DON'T CARE.
Yes. I have often wished I could vote for the Republican Party of the 1860's. Sadly, the economic wing of the party was all to eager to jump into the pockets of the robber barons; and the social wing ran right off the deep end with their pivot from abolition to prohibition.
You missed the key element. The title includes the text "(Video)". I.e. there is no content here, but somebody managed to find a way to stretch this lack of content out from a 5-6 sentence PR piece into a 20-25 minute video. Just skip the whole thing.
What is your basement made of? H2 will diffuse through solid metal. This fact (among others) is what keeps fuel cell vehicles in the realm of science fiction (or very expensive demonstrations anyway).
Do you have any idea how close a tolerance you must have in order to have millions of bricks and have any pair of them mate cleanly, easily, and with sufficient clutch to not immediately fall off? And have multiple "legal" connection locations on each brick? And permit multiple bricks attach with equal spacing and equivalent strength?
We are talking a process capability that rivals, if not vastly exceeds, most aerospace manufacturers. No disrespect to the rocket science guys, but we are talking tight tolerances on small parts.
A better way to state the question: half the population has sub-median intelligence
Half the population will always have sub-median intelligence. That is what median means.
That said, I believe that we will have a stronger society if we focus on elevating the lower educated to a higher educated state. I do not want to create a permanent underclass of semi- or un-skilled labor supporting the higher class's state of near permanent leisure.
Slashdot Mirror
...no matter how beefy you make an aluminum part, after enough cyclic stresses it will suffer fatigue failure.
You realize that chart has a log scale, right? It is not a matter of designing for infinite life, it is a matter of designing for "infinite enough". This is how they make aluminum engine blocks and heads. Sure it will fail in fatigue eventually. But after 50 years or so, it is time to replace the dern thing anyway. In other words, fatigue strength is just one more variable to design around. Even if the part was made from titanium or steel, they still might make the decision to not design for "infinite" life due to other overriding design considerations. Weight, for example.
The concern with the wheel design was not fatigue itself, but rather a higher peak load during the fatigue cycle. The wheels were not designed for the type of terrain they landed on. More bad luck than bad planning because the type of terrain they landed on had not been observed on Mars before.
In my experience, it is very difficult to successfully design for conditions that have never been observed before.
Yay! I'm an extreme minority!
And who the fuck is Dane Cook?
I cry every damn time I read that one. And I don't care who knows. Heck. I cry just reading the wikipedia entry for Spirit.
That collection of nuts, bolts, and solar panels did more with less and used up every last bit of its capability in the pursuit of its mission. Yes I know I am anthropomorphising a bit (a lot), but I DON'T CARE.
No flying cars.
But we do have videos about how there are no flying cars on slashdot. That's worth something. Well, for very small values of "something", anyway.
You realize all those "chicks" are actually spam-bots using images culled from inactive instagram accounts, right?
And since when do "gangstas" post on /.?
The old maxim:
"If trebuchet is not the answer, you are asking the wrong question."
Never underestimate the bandwidth of a trebuchet loaded with a dumptruck full of pennies.
We are talking about bandwidth, right?
http://www.wolframalpha.com/in...
$260,000. I'm sure Verizon loses that in the couch cushions every other month.
http://xkcd.com/1262/
Wake up, gweihir. The matrix has you.
The old auto racing quote:
"In order to make a small fortune in racing, first you need a large fortune."
Yes. I have often wished I could vote for the Republican Party of the 1860's. Sadly, the economic wing of the party was all to eager to jump into the pockets of the robber barons; and the social wing ran right off the deep end with their pivot from abolition to prohibition.
Well. Clearly you have not been looking at her XKeyscore file.
You missed the key element. The title includes the text "(Video)". I.e. there is no content here, but somebody managed to find a way to stretch this lack of content out from a 5-6 sentence PR piece into a 20-25 minute video. Just skip the whole thing.
Finally a jobs bill that republicans can get behind.
All crashes are avoidable. ALL.
Once you take this as your primary design principle, all this ethics gobbledy-gook goes away.
Me: "Ok, they are offering me XXX you give me XXX*20% and I'll stay"
Proposal Accepted.
Not to worry. I am sure the boys up in Redmond are working night and day to increase the % of malware affecting windows phones.
https://xkcd.com/1162/
Hmmm. Fat is more energy dense than coal.... I have a modest proposal!
What is your basement made of? H2 will diffuse through solid metal. This fact (among others) is what keeps fuel cell vehicles in the realm of science fiction (or very expensive demonstrations anyway).
False. Any salt is easily reduced to its component ions by exposing it to water.
Do you have any idea how close a tolerance you must have in order to have millions of bricks and have any pair of them mate cleanly, easily, and with sufficient clutch to not immediately fall off? And have multiple "legal" connection locations on each brick? And permit multiple bricks attach with equal spacing and equivalent strength?
We are talking a process capability that rivals, if not vastly exceeds, most aerospace manufacturers. No disrespect to the rocket science guys, but we are talking tight tolerances on small parts.
Clearly their first mistake was being born poor.
Seriously kids, don't get born poor. It really stinks.
A better way to state the question: half the population has sub-median intelligence
Half the population will always have sub-median intelligence. That is what median means.
That said, I believe that we will have a stronger society if we focus on elevating the lower educated to a higher educated state. I do not want to create a permanent underclass of semi- or un-skilled labor supporting the higher class's state of near permanent leisure.
Let's be honest. The self respecting nerds left /. years ago.