TEARS OF RUPERT
Nice to see you here. Welcome to Wolverine’s science channel. In
this article, we will talk about Prince Rupert’s Drop, which is widely
used to express someone’s love to their lifetime beloved.
THROUGH THIS ARTICLE WE CAN SEE:
l 1.Where does it come from?
l 2.What kind of wonder does it have?
l 3.What the fantastic principle hide in it?
l 4.How to create Rupert’s Drop?
l 5.Some application of it...
1. The origin story of it’s name:
It is said that in the 17th century, Prince Rupert melted a piece of glass and then let itself drop into cold water. By chance, it formed a transpar-ent object like a tear which received a name like poem: Prince Rupert’s Drop.
2.It’s magical characteristics:
The image below shows the bullet hitting its teardrops itself.
Teardrops themselves are much harder than normal glass and can not
break under 8 tons of pressure . However, if you grab its slender tail
and apply a little pressure, the whole glass will burst and shatter,
exploding at a rate equivalent to 7 kilometers per second.
But why does this phenomenon happen?
3.Principle analysis of Rupert’s drop:
In 1994, Purdue University's S. Chandrasekar and M.M. Chaudhri of the University of Cambridge observed the teardrops breaking using high-speed split-length photography. They concluded from experiments that the surface of the glass teardrops had a strong pressure stress (the surf-ace was "squeezed") and the interior had a strong pull stress (the inside was "stretched"). Therefore, the teardrops are in an unstable equilibrium state, while the tail is the weakness of the whole teardrops. At the same time, a single crack accelerates from the tail of a teardrop to the head at speeds of up to 1900 m/s.
Prince Rupert's Drop were all in high pressure, all in stress concentration, but in a state of stress equilibrium.
Once the tail breaks, the stress there disappears and the high-pressure stress elsewhere is released to the place where it disappears. This process is done in an instant at a speed equivalent to 1.7 km/s.
In order to better explain the ultra-high strength of Prince Rupert s Drop 『s sleekbottom, the structure of tempered glass had to be mentioned. Tempered glass, also knownas reinforced glass, is ordinary glass after heat treatment, chemical treatment and otherprocesses made. There is a thin layer of pressure stress on the surface of tempered glass,which is why it has high pressure strength. Under the pressure stress layer, the structure ofthe glass is more tight, especially the internal defects of its surface are squeezed, to avoidthe spread of cracks. When tempered glass is subjected to external compression, the internal pull stress is offset to withstand greater compression, and when tempered glass is stretched, the pressure stress on its surface is released, thus increasing the stre
In the laws of physics, pressure stress and stress exist at the sametime, both of which are of equal size and in opposite directions. Once there is a stressimbalance inside Prince Rupert's Drop, even if the tip is slightly dented, the whole chainreaction occurs. The glass breaks when the internal ultra-high pressure is released.
4.The production of Prince Rupert's Drop:
In order to better explain the ultra-high strength of Prince Rupert's Drop sleek bottom, the structure of tempered glass had to be mentioned. Tempered glass, also known as reinforced glass, is ordinary glass after heat treatment, chemical treatment and other processes made.
5.The application of the principle:
Such a glass ball is ideal for resisting shock, although it is better to
replace it with alumina with higher strength and melting point, and
the first generation of composite armor used in the Soviet T64B tank,
the main material for the impact is some of the alumina balls that
have been treated in this way.
Are you fascinated by the magical nature of Rupert's tears?You can try to make one if you can or buy one online. If you have any other discov-eries, please contact us.