8 votes

Why do good materials operate in non-equilibirium conditions?

For example this could be the heating of a metal to extreme temperature and abruptly putting it in cold environment to anneal it, thus typically resulting in good mechanic resistance. The main ...
Roger V.'s user avatar
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4 votes
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Is there a name for this phenomenon?

The phenomenon is called dilatancy. In my former life as a colloid science I frequently encountered this in concentrated dispersions (the archetypal example of this is oobleck) though the mechanism ...
John Rennie's user avatar
3 votes

How do sand balls retain their integrity for so long?

A great question about granular physics. We have to start with sandcastle physics, such as discussed in this Nature article on "What keeps sandcastles standing?" or this Physical Review ...
David Bailey's user avatar
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3 votes

Computational modelling of sand pile

You should familiarise yourself with the BCRE model or related work. See, for example, https://www.researchgate.net/publication/...
kricheli's user avatar
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3 votes
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Why do good materials operate in non-equilibirium conditions?

The induced stresses experienced during processing of engineering alloys at high temperatures and strain rates is intended to improve the mechanical properties of the alloy by diffusing beneficial ...
niels nielsen's user avatar
2 votes

Why do good materials operate in non-equilibirium conditions?

Frame Challenge: What are "good" materials? There are quite a few things that can make a material "good". Like hardness (diamonds), ductility (copper), compressive strength, ...
cmaster - reinstate monica's user avatar
2 votes
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Settling effect of crumbs in food

When you gently shake a bag of chips, you can think of it as disturbing the positions of all of the chips a little bit in some random direction. Gravity means that if the new position of the chip is a ...
probably_someone's user avatar
1 vote
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Computational modelling of sand pile

When working with wet sant I dont see any way to solve this easily. When working with dry sand, consider that up to a certain steepness $m$, piles are practically completely stable, at least if left ...
KGM's user avatar
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1 vote
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Using abrasive lapping, is it possible to make a perfectly round cylinder starting with imperfect cylinder(s)?

I was curious about this question as well. Answer is no. Let me explain. For achieving precision from nothing you need to somehow provide measurment from one area of an object to all other areas of ...
Surprised Seagull's user avatar
1 vote

When pressing coffee, why does boiling water and coffee mixture appear to decrease after grounds are pressed to bottom?

the ground coffee contains air, so you press the air out.So it's not a physic question, but just knowing, what a sponge does.
trula's user avatar
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1 vote
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Definition of granular material

Granular materials (GM) are primarily defined as being athermal - thermal fluctuations/energies are negligible compared with grain-grain or grain-environment interaction energies - disordered, and ...
rkoz's user avatar
  • 26
1 vote

Definition of granular material

The first line of An Introduction to Granular Flow by K. Kesava Rao and Prabhu R. Nott (2008): A granular material is a collection of solid particles or grains, such that most of the particles are ...
pentane's user avatar
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