Glass. Had to re-upload. did you know'? Dropping molten glass into cold water produces droplets whose head can withstand hammer blows, but which explodes violen reupload dyk glass
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Glass

Had to re-upload

did you know'?
Dropping molten glass into cold water
produces droplets whose
head can withstand hammer blows, but
which explodes violently if its tail is
damaged.
...
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#2 - thumbpadawan (05/08/2014) [+] (33 replies)
For anyone Interested

"molten glass" is a bit of a loose term, considering glass refers to a type of material, rather than a specific material. You can get lots of different types of glass, including volcanic glasses such as obsidian.

Unlike most solids, glass doesn't have a regular or crystalline structure.
When solids become liquid, no matter how regular the solid structure is, the particles flow over each other and so it has no regularity. As the temperature is lowered and they lose kinetic energy, the particles begin to reform their neat crystal structure to form their solid.

The water quenches the liquid: water cools objects faster than air because there are more particles to take away the heat in a liquid than a gas. When drenched in water, the particles cannot reorganise themselves fast enough before they lose energy and become amorphous solids (non-crystalline).

Because of the irregularity of the solid particles, the glass cannot respond plastically to deformation. Instead of deforming, they crack and the crack propagates through weaknesses in the amorphous solid. This means that they only withstand a small amount of strain before breaking (strain is how far a material stretches when it is stressed).

The stress can be calculated by force/area. The area on the tail is much lower than the head and so the stress as a result of the hammer blow will be higher. This leads to higher strain (strain = ε = σ/E = stress/Young's modulus (a material property).The material will be more likely to fail and so fractures will propagate through the whole material.

Some materials have mechanisms to withstand fractures. Fibrous materials, such as fiber glasses, have fibers which are embedded in a composite groundmass. When the crack propagates through the groundmass, the fibers (to a certain extent) can hold the material together. This makes the material tougher.

I think this explains it. At least slightly. Let me know if I missed stuff out or got stuff wrong.
#20 - refraxion (05/09/2014) [-]
Comment Picture
User avatar #7 - okamiterasu (05/08/2014) [+] (3 replies)
Mystery of Prince Rupert's Drop at 130,000 fps - Smarter Every Day 86
prince ruperts drop
#39 - Byte (05/09/2014) [+] (1 reply)
Comment Picture
Mystery of Prince Rupert's Drop at 130,000 fps - Smarter Every Day 86
#1 - sinery (05/08/2014) [+] (4 replies)
Science's FW glass becomes stronger underwater.
#34 - include (05/09/2014) [-]
Comment Picture
#71 - nimblewalrus (05/09/2014) [+] (1 reply)
Hammer time?
Hammer time?
#29 - cannibalvegan ONLINE (05/09/2014) [+] (3 replies)
**cannibalvegan rolled image** I want to know what happens if you upload a picture at the same time you roll one.
#30 to #29 - cannibalvegan ONLINE (05/09/2014) [-]
Well, it seems like the roll went through, but the upload didn't.

Now you know, kids.

P.S. This is the picture I uploaded.
#67 - lordraine ONLINE (05/09/2014) [+] (4 replies)
So what happens if we do this in zero-gs, and it forms as a (more or less) perfect sphere?
#35 - popeflatus (05/09/2014) [-]
These are called Prince Rupert's Drops.
User avatar #16 - LocoJoe (05/09/2014) [+] (7 replies)
Now to use these in war.
User avatar #60 - thekillerwalrus (05/09/2014) [+] (8 replies)
Can someone explain how this is possible? It sounds really cool
User avatar #65 to #60 - iwaslvlthree (05/09/2014) [-]
the outside of the glass droplet chills in an instant while the core is still melted.
the core slowly settles but there is no room to expand so it pushes the outside layer making it almost indestructable. but the tail is so thin it can shatter the whole thing because physics and pulses.


you know just like some bridges can colapse cause of the wind having the same resonance as the materials if the wind blows just right.
User avatar #37 - acousticgenie (05/09/2014) [+] (4 replies)
www.youtube.com/watch?v=xe-f4gokRBs

Go about 2:30 in and it shows it exploding in super slow-mo
User avatar #48 - samthediv ONLINE (05/09/2014) [-]
I made these last year whilst ******* around in the tech classroom.
Was fun stuff until the teacher saw, and told us off for not showing him "That awesome stuff sooner"
User avatar #78 - asadshoe (05/09/2014) [+] (5 replies)
darkskin wants to be mention so I mentioned him.
User avatar #79 to #78 - darkskin (05/09/2014) [-]
no, i love being mentioned
wording can save lives
User avatar #77 - PapaParuta (05/09/2014) [-]
its called a Rupert's Drop
User avatar #44 - landerp (05/09/2014) [+] (3 replies)
Am I the only one whose first thought was to turn this into some kind of weapon?
User avatar #12 - Alchemyst (05/08/2014) [+] (1 reply)
Why the hell hasn't this been weaponized yet?
#6 - geoffster (05/08/2014) [-]
Video of it

Prince Rupert's Drop
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