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Posted: 1/9/2015 10:31:38 AM EDT
[#1]
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Posted: 1/9/2015 10:45:17 AM EDT
[#2]
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Posted: 1/9/2015 10:51:19 AM EDT
[#3]
Quote HistoryCliff notes? 
I'm stuck at the office and can't hunt this thing down and digest it till later. |
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Posted: 1/9/2015 10:57:12 AM EDT
[#4]
Are molecular magnets like other magnets? That is, that they work because of magic?
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Posted: 1/9/2015 10:59:04 AM EDT
[#5]
Here's the thing - ALL materials have cracks. Period. The only 2 questions are:
1) How big are they? 2) Where are they? |
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Posted: 1/9/2015 11:00:44 AM EDT
[#6]
Quote HistoryQuoted:
Here's the thing - ALL materials have cracks. Period. The only 2 questions are: 1) How big are they? 2) Where are they? It all comes down to how small you can make the inclusions.
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Posted: 1/9/2015 11:02:22 AM EDT
[#7]
Likely all of the little jagged edges and angles on the two broken surfaces are interlocked.
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Posted: 1/9/2015 11:03:13 AM EDT
[#8]
http://en.wikipedia.org/wiki/Glass
Have at it. |
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Posted: 1/9/2015 11:04:26 AM EDT
[#9]
Propagation simple propagation,,,propagation is the game we like to play.
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Posted: 1/9/2015 11:09:33 AM EDT
[#10]
Shared hydrogen bonds?
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Posted: 1/9/2015 11:10:29 AM EDT
[#11]
covenant bonding.
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Posted: 1/9/2015 11:23:28 AM EDT
[#12]
If you washed the cup every now and then, the interior would not have been coated in an thick layer of coffee shellac.
Find a replacement that is both well-insulated, and can go in the dishwasher. http://www.thermos.com/products/vacuum-insulated-16-oz-midnight-blue-travel-tumbler.aspx |
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Posted: 1/9/2015 11:25:49 AM EDT
[#13]
Pics of husband holding cup.
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Posted: 1/9/2015 11:26:47 AM EDT
[#14]
Quote HistoryYes, but how do they work? |
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Posted: 1/9/2015 11:32:37 AM EDT
[#15]
Do you wash your coffee cup?
Also, pics of cup? |
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Posted: 1/9/2015 12:08:24 PM EDT
[#16]
Does it leak through the crack?
A proper engineer will keep asking questions until you just go away with no answer. |
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Posted: 1/9/2015 12:13:38 PM EDT
[#17]
Quote HistoryQuoted: If you washed the cup every now and then, the interior would not have been coated in an thick layer of coffee shellac. Find a replacement that is both well-insulated, and can go in the dishwasher. http://www.thermos.com/products/vacuum-insulated-16-oz-midnight-blue-travel-tumbler.aspx That said, here are the manufacturer's instructions regarding dish-washability: "
Do as you will with that information, but now you know what you are not supposed to do. |
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Posted: 1/9/2015 2:06:30 PM EDT
[#18]
Oh come on! You didn't learn about the millions of tiny little gnomes holding matter together when you were in school?
What is holding your coffee mug together is the same thing that allows Neo to look like the Neo he's used to seeing in the mirror and not look like Morpheus. "Remembered identity." Your coffee mug remembers it was a mug and holds its shape even though it was filled with the red bull instead of the blue hills coffee. It's awake and atrophied but still retains its shape because that's what it remembers it looking like. Ok, really, it boils down to a nuclear force. Down at the atomic level, the elements that compose your coffee mug have an affinity for each other and share electrons amongst themselves... kind of like sharing a joint but a lot smaller and a lot more joints and a lot faster. There's a crack where you dropped it and the bonds between the atoms at that point were separated but their nuclear force is still holding them together. It's like when you've got a piece of cellophane and it'll stick to your finger like a booger but shake your finger and it'll fall off. Weak nuclear bonds join the electrons in the cellophane's atoms to orbit around in the electron clouds of the atoms making up your fingers. Or it might just be called static electricity. If I'm right, awesome and yay me. If I'm wrong, then boo! And the stuff holding your mug together is called a monomer. Or a polymer. Or a copolymer. Or an ionomer. Or something 'erish. And it has the remarkable ability to take some massive shearing forces that would shatter a ceramic mug but only crack yours. It's flexible enough at its molecular level to absorb the shock (mostly... it did suffer damage to its coherent matrix of matter) |
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Posted: 1/9/2015 3:24:18 PM EDT
[#19]
Quote HistoryQuoted:
Pics of husband holding cup. You stay away from my man, you hussy. |
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Posted: 1/9/2015 5:01:53 PM EDT
[#20]
Polymers have very little in common with glass.
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Posted: 1/9/2015 5:06:20 PM EDT
[#21]
difficult to say when you cant even give us the material specs
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Posted: 1/9/2015 5:36:40 PM EDT
[#22]
Quote HistoryQuoted:
difficult to say when you cant even give us the material specs If you're an engineer you just make them up anyway, right? |
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Posted: 1/9/2015 7:38:36 PM EDT
[#23]
Quote HistoryQuoted:
If you're an engineer you just make them up anyway, right? Quote HistoryQuoted:
Quoted:
difficult to say when you cant even give us the material specs If you're an engineer you just make them up anyway, right? I hope that was said in jest, or is there some underlying dislike of engineers buried in this thread? |
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Posted: 1/9/2015 10:42:42 PM EDT
[#24]
Quote HistoryQuoted:
I have one of those, and it works great. That said, here are the manufacturer's instructions regarding dish-washability: "
Quote HistoryQuoted:
Quoted:
If you washed the cup every now and then, the interior would not have been coated in an thick layer of coffee shellac. Find a replacement that is both well-insulated, and can go in the dishwasher. http://www.thermos.com/products/vacuum-insulated-16-oz-midnight-blue-travel-tumbler.aspx That said, here are the manufacturer's instructions regarding dish-washability: "
Meh, the lid goes on the top rack with all the other materials that the OP would not be able to identify 
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Posted: 1/9/2015 10:48:44 PM EDT
[#25]
Quote HistoryQuoted:
It all comes down to how small you can make the inclusions. Quote HistoryQuoted:
Quoted:
Here's the thing - ALL materials have cracks. Period. The only 2 questions are: 1) How big are they? 2) Where are they? It all comes down to how small you can make the inclusions. Is this true for even materials that are single crystal? I think they are homogenous down to the molecular level. I could be wrong....
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Posted: 1/9/2015 11:56:04 PM EDT
[#26]
Quote HistoryQuoted:
Here's the thing - ALL materials have cracks. Period. The only 2 questions are: 1) How big are they? 2) Where are they? What about "What conditions might cause them to propagate?" |
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Posted: 1/9/2015 11:56:58 PM EDT
[#27]
Quote HistoryQuoted:
Pics of husband holding cup. Good one. 
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Posted: 1/9/2015 11:59:33 PM EDT
[#28]
Quote HistoryQuoted:
covenant bonding. All the molecules promise to hold on to each other? |
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Posted: 1/10/2015 12:00:32 AM EDT
[#29]
In before the aliens guy?
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Posted: 1/10/2015 12:01:22 AM EDT
[#30]
"The crack was not deep enough to release the magic smoke" is my professional opinion.
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Posted: 1/10/2015 12:11:04 AM EDT
[#31]
Quote HistoryQuoted: It all comes down to how small you can make the inclusions. Quote HistoryQuoted: Quoted: Here's the thing - ALL materials have cracks. Period. The only 2 questions are: 1) How big are they? 2) Where are they? It all comes down to how small you can make the inclusions. |
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Posted: 1/10/2015 12:12:12 AM EDT
[#32]
Quote HistoryQuoted:
Does it leak through the crack? A proper engineer will keep asking questions until you just go away with no answer. This guy is obviously a senior engineer. Maybe even the chief engineer! |
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Posted: 1/10/2015 12:18:27 AM EDT
[#33]
Probably being held together by the factor of safety...
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Posted: 1/10/2015 12:19:01 AM EDT
[#34]
Guh I engineer all day, just want to come hope an look at shiny things and read about guns on the intranets but noooo you have to make me think at home too!
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Posted: 1/10/2015 3:09:48 AM EDT
[#35]
My wife is a Ceramic Engineer. I could ask her, but I'm not waking her up to do it and I'm sure I won't remember in the morning. You're welcome. |
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Posted: 1/10/2015 3:38:50 AM EDT
[#36]
Quote HistoryQuoted:
I hope that was said in jest, or is there some underlying dislike of engineers buried in this thread? Quote HistoryQuoted:
Quoted:
Quoted:
difficult to say when you cant even give us the material specs If you're an engineer you just make them up anyway, right? I hope that was said in jest, or is there some underlying dislike of engineers buried in this thread? Oh that's right, engineers are literal people. Here's your smiley face.
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Posted: 1/10/2015 3:40:47 AM EDT
[#37]
Quote HistoryQuoted:
All the molecules promise to hold on to each other? Quote HistoryQuoted:
Quoted:
covenant bonding. All the molecules promise to hold on to each other? 
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Posted: 1/10/2015 3:47:15 AM EDT
[#38]
Quote HistoryQuoted:
Oh come on! You didn't learn about the millions of tiny little gnomes holding matter together when you were in school? What is holding your coffee mug together is the same thing that allows Neo to look like the Neo he's used to seeing in the mirror and not look like Morpheus. "Remembered identity." Your coffee mug remembers it was a mug and holds its shape even though it was filled with the red bull instead of the blue hills coffee. It's awake and atrophied but still retains its shape because that's what it remembers it looking like. Ok, really, it boils down to a nuclear force. Down at the atomic level, the elements that compose your coffee mug have an affinity for each other and share electrons amongst themselves... kind of like sharing a joint but a lot smaller and a lot more joints and a lot faster. There's a crack where you dropped it and the bonds between the atoms at that point were separated but their nuclear force is still holding them together. It's like when you've got a piece of cellophane and it'll stick to your finger like a booger but shake your finger and it'll fall off. Weak nuclear bonds join the electrons in the cellophane's atoms to orbit around in the electron clouds of the atoms making up your fingers. Or it might just be called static electricity. If I'm right, awesome and yay me. If I'm wrong, then boo! And the stuff holding your mug together is called a monomer. Or a polymer. Or a copolymer. Or an ionomer. Or something 'erish. And it has the remarkable ability to take some massive shearing forces that would shatter a ceramic mug but only crack yours. It's flexible enough at its molecular level to absorb the shock (mostly... it did suffer damage to its coherent matrix of matter) See! THIS is the fascinating thing about materials. Of any kind. For any property there seems to be an opposite force for that property. What you can make, you can unmake. Do and undo. Poison and antidote. It's a ballet of cause and effect, so elegant. SO many factors that go into so many different properties. And states of matter...if glass is a liquid, then it's in a state of flow of some sort, right? ANd is there a timeline associated with it? Is that the concept behind an atomic clock? Is shattering a glass interrupting its timeline? When I start trying to think about all the different planes of existence it gets complicated, maybe because I haven't taken university level engineering or physics. But looking at these questions like a layman means I think in layman's terms, and that means having to think metaphorically so I can understand concepts foreign to me. |
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Posted: 1/10/2015 6:37:53 PM EDT
[#39]
Quote HistoryQuoted:
What about "What conditions might cause them to propagate?" Quote HistoryQuoted:
Quoted:
Here's the thing - ALL materials have cracks. Period. The only 2 questions are: 1) How big are they? 2) Where are they? What about "What conditions might cause them to propagate?" Those *are* the conditions, along with the type of material. Crack propagation depends on 3 things: 1) Stress - hence the location, as different areas on a part have different stress risers 2) How big it is to start with 3) a coefficient determined experimentally for each material/alloy. If you have those, you can determine how many load cycles a component can experience at various loads. It's not a linear relationship - if the crack is small enough to start, or the stress is low enough, it can experience effectively infinite cycles. Think steel car wheel. But as the crack size increases, or the stress level does, the number of cycles a part can see before fracture comes down a lot. It's why the original Oldsmobile diesels would break crankshafts, which was otherwise unheard of at the time. The beancounters figured they just had to slap diesel heads on a gas engine bottom end - including, I believe, a cast crank. But diesels put a LOT more stress on cranks than gas engines do. The cast cranks experienced classic fatigue failure, because the casting process inherently leaves larger discontinuities than forgings, and they were above the size that allowed that defacto infinite life we had come to expect. Olds changed to forged cranks, as well as some other improvements, and the engines became very reliable, but too late. In the public's mind diesel engines in cars were now "unreliable" and they still haven't recovered from that slander. |
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Posted: 1/10/2015 6:38:15 PM EDT
[#40]
Quote HistoryQuoted:
My wife is a Ceramic Engineer. I could ask her, but I'm not waking her up to do it and I'm sure I won't remember in the morning. You're welcome. Alfred grad? My cousin went there. |
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Posted: 1/10/2015 6:44:37 PM EDT
[#41]
Quote HistoryQuoted: This guy is obviously a senior engineer. Maybe even the chief engineer! Quote HistoryQuoted: Quoted: Does it leak through the crack? A proper engineer will keep asking questions until you just go away with no answer. This guy is obviously a senior engineer. Maybe even the chief engineer! ... surprisingly, the ability to construct a formal, Root Cause Analysis is rare
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Posted: 1/10/2015 6:47:56 PM EDT
[#42]
Quote HistoryQuoted: Pics of husband holding cup.  |
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Posted: 1/12/2015 2:23:41 AM EDT
[#43]
Quote HistoryQuote HistoryQuoted:
Quoted:
Pics of husband holding cup. http://upload.wikimedia.org/wikipedia/commons/c/c1/Old_man_in_Harar2.jpg Very funny, Ultamagbrion.  
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Posted: 1/12/2015 8:30:17 PM EDT
[#44]
As I understand it, an atomic clock doesn't deal with states of matter. It deals with the decaying of an atom and it's half life and electrons and crap... Like at the end of a football game... One team is beating the tar out of the other and the fans are leaving... Think of the fans as electrons being cast off as the atom changes from whatever it is to a different element... To a different element... To finally become stable... Like cesium to whatever it turns into...
It's not quite as fast as the stands cleared out when one team was getting waxed 75-3 because it takes years for the half life to change... But it's known how many electrons are shed by certain elements as they degrade and slough off into something new. Remember, there are 4 states if matter: solid, liquid, gas, and plasma. Different planes of existence gets more into a metaphysical discussion... |
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