Been seeing a lot of videos about them breaking glasses in an instant, but i’m clueless to this sorcery. The same glasses take say a conventional hammers/crowbars/screwdrivers multiple tries to break. There’s no source telling how it works and i’ve personally never seen this thing in real life. Why do these hammers have such a small tip and how does it breaks glasses with ust a mild pressure on the window? I get the seatbelt cutting part, but the hammer part is a bit baffling.
Is “f=ma” the right answer to this concept?
Some unusual designs they’re coming in now (tubes) are beyond my comprehension.
In: 14
The important feature of a safety hammer is its hardened tip. The safety glass is hardened glass which are often much harder then regular steel. So if you try to push a regular steel object, like a knife, into the glass then the steel will just bend or mushroom against the hard glass. This spreads the load over a larger surface area so the glass can withstand the force better. However a safety hammer have a hardened tip, it may not be as sharp as a knife so there is no danger of cutting yourself with it. However when the hardened tip hits the hardened glass it will not deform and all the force gets focused on a tiny spot in the glass. This tiny spot is where the glass first cracks. The cracks goes into the glass where it is more brittle and the cracks go through the center of the glass all the way to the edges filling the glass with cracks.
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