4
votes
Is a single large impact better than several small impacts for breaking ice
Multiple smaller, light impacts are better.
The heavy concentrated impact can damage and crack the already fragile pavement which has likely lost most of its resilience due to the freezing ...
- 22.8k
4
votes
How effective are screen protectors?
I don't think of a screen protector as a mono layer, but a lamination. Deformable (softer) materials (possibly above and also) below the rigid layer (this layer also generally provides adhesion). That ...
- 496
2
votes
Accepted
Can someone please explain how impact is absorbed?
During impact what usually happens is that a moving object with mass $m$ with an initial velocity $v_0$ stops (or rebounces) in a very short time $\Delta t$. Assuming a body stops during impact this ...
- 24.3k
2
votes
Accepted
Testing specimens by dropping a ball on them and counting the number of drops required before the collapse. A better way?
It sounds like you could modify the procedure and equipment used for a soil standard penetration test (ASTM D1586). In this test, a hammer of specific weight is dropped a specific distant to strike ...
- 10.7k
1
vote
Accepted
How does an impact driver convert the lateral motion of the spring expansion, into rotational force?
https://www.wonkeedonkeetools.co.uk/cordless-impact-drivers/how-does-the-impact-function-work
Coil springs can be both compressed and twisted.
The compression of the spring is what allows the hammer ...
- 5,629
1
vote
Vibration following an impact
Regarding your first question IMHO eigenvalue analysis is appropriate and valid as long as the material is within the elastic range. Also another misconception is that, the application of eigenvalue ...
- 24.3k
1
vote
Accepted
Why do some metals with bcc structure show ductile-brittle transition in charpy impact test?
It essentially depends on the fracture mechanisms available to the material at the temperature in question. In general, dislocations are more mobile at higher temperatures, enabling plastic ...
- 36
1
vote
How to create a mechanical equivalent to dropping object onto steel floor
Freefall friction-less velocity of an object falling 1 meter is
$$ V= \sqrt{2hg}= \sqrt{2g}=4.427m/s $$
This velocity decreases to zero in a short time after the crash, and unless your ball is not a ...
- 22.8k
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