Internal stress in a glass material is an important source of strength

Sam Wormley

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May 24, 2013, 5:04:49 PM5/24/13

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Internal stress in a glass material is an important source of strength
> http://physics.aps.org/articles/v6/60

> Glass in products such as smart phone screens is made tougher by
> internal stress that is locked in during the formation process. In
> Physical Review Letters, a research team presents a model for this
> “residual stress” at the molecular scale. They combined experiments,
> simulations, and theory for a system of microscopic beads that mimics
> a glass. The team found that, contrary to some predictions, residual
> stress can be permanent, rather than decaying to zero over time,
> strengthening the case that glasses are not just highly viscous
> liquids. In addition, they precisely controlled the amount of
> residual stress in their glass, providing the first systematic
> demonstration that the history of stresses on a material can
> determine its properties.
>
> A famous example of residual stress in glass is the Prince Rupert’s
> drop (or Dutch tear). Dropping molten glass into cold water forms a
> tadpole-shaped object where the “head” can withstand blows from a
> hammer, but the whole thing explodes if the thin tail is cut.

benj

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May 24, 2013, 6:29:31 PM5/24/13

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Oh look at this, Oh Worm-group! Once we point you in the right direction
you suddenly discover tempered glass! Hooray for youse!

Poutnik

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May 25, 2013, 5:43:10 AM5/25/13

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benj posted Fri, 24 May 2013 22:29:31 GMT

>
> On Fri, 24 May 2013 16:04:49 -0500, Sam Wormley wrote:
>
> > Internal stress in a glass material is an important source of strength
> >> http://physics.aps.org/articles/v6/60
> >
> >
> >> Glass in products such as smart phone screens is made tougher by
> >> internal stress that is locked in during the formation process. In
> >> Physical Review Letters, a research team presents a model for this

> >> ?residual stress? at the molecular scale. They combined experiments,

> >> simulations, and theory for a system of microscopic beads that mimics a
> >> glass. The team found that, contrary to some predictions, residual
> >> stress can be permanent, rather than decaying to zero over time,
> >> strengthening the case that glasses are not just highly viscous
> >> liquids. In addition, they precisely controlled the amount of residual
> >> stress in their glass, providing the first systematic demonstration
> >> that the history of stresses on a material can determine its
> >> properties.
> >>

> >> A famous example of residual stress in glass is the Prince Rupert?s

> >> drop (or Dutch tear). Dropping molten glass into cold water forms a

> >> tadpole-shaped object where the ?head? can withstand blows from a

> >> hammer, but the whole thing explodes if the thin tail is cut.
>
> Oh look at this, Oh Worm-group! Once we point you in the right direction
> you suddenly discover tempered glass! Hooray for youse!

Is this your post more useful than his ?

--
Poutnik

alie...@gmail.com

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May 25, 2013, 5:59:11 AM5/25/13

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Try Googling for "tempered glass" and "residual stress in glass".

Mark L. Fergerson

Poutnik

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May 25, 2013, 6:16:43 AM5/25/13

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nu...@bid.nes posted Sat, 25 May 2013 02:59:11 -0700 (PDT)

> >
> > > Oh look at this, Oh Worm-group! Once we point you in the right direction
> > > you suddenly discover tempered glass! Hooray for youse!
> >
> > Is this your post more useful than his ?
>
> Try Googling for "tempered glass" and "residual stress in glass".
>

I need not, unless your post is targetted to benj.

I remember well "experimenting" with these "glass tears"
in the high school many yers ago,
but I do not remember if we tried hammering.

--
Poutnik

benj

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May 25, 2013, 1:37:18 PM5/25/13

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On Sat, 25 May 2013 11:43:10 +0200, Poutnik wrote:

> benj posted Fri, 24 May 2013 22:29:31 GMT

>> Oh look at this, Oh Worm-group! Once we point you in the right
>> direction you suddenly discover tempered glass! Hooray for youse!
>
> Is this your post more useful than his ?

Well that depends upon whether or not you are dumb enough to believe all
the Worm-group AGW propaganda. If you are then perhaps you'll find this
post enlightening as to the level of science among the "climate science"
promoters.

benj

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May 25, 2013, 1:40:01 PM5/25/13

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So you actually know that "tempered glass" is not the amazing "new"
discovery that Worm-group purported it to be, yet you still defend the
incompetent science of these clowns? What is the matter with you?

Poutnik

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May 25, 2013, 1:47:23 PM5/25/13

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benj posted Sat, 25 May 2013 17:37:18 GMT

I know enough from atmospheric physics, that is propaganda independent,
to realize what is rooted in good science and what is not.

BTW, glass stress has little to do with climate science.

--
Poutnik

Poutnik

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May 25, 2013, 1:50:23 PM5/25/13

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benj posted Sat, 25 May 2013 17:40:01 GMT

There is always somebody who takes old news as new ones.

And as I said, I am well rooted in science, having good background,
so I am able to distinguish.

There is strong correlation between dirty vocabulary
and lack of proper physical knowledge.

--
Poutnik

benj

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May 25, 2013, 1:57:02 PM5/25/13

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Well that's odd.... sci.physics isn't a climate science newsgroup!

Poutnik

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May 25, 2013, 2:06:09 PM5/25/13

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benj posted Sat, 25 May 2013 17:57:02 GMT

CS is based on physics. At least for scientists.

Many AGW subscribers have not much clue
about physical properties of matter.

--
Poutnik

benj

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May 25, 2013, 3:07:41 PM5/25/13

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On Sat, 25 May 2013 19:50:23 +0200, Poutnik wrote:

> benj posted Sat, 25 May 2013 17:40:01 GMT
>
>
>
>> On Sat, 25 May 2013 12:16:43 +0200, Poutnik wrote:
>>
>> > nu...@bid.nes posted Sat, 25 May 2013 02:59:11 -0700 (PDT)
>>
>> >> > > Oh look at this, Oh Worm-group! Once we point you in the right
>> >> > > direction you suddenly discover tempered glass! Hooray for
>> >> > > youse!
>> >> >
>> >> > Is this your post more useful than his ?
>> >>
>> >> Try Googling for "tempered glass" and "residual stress in glass".
>> >>
>> > I need not, unless your post is targetted to benj.
>> >
>> > I remember well "experimenting" with these "glass tears" in the high
>> > school many yers ago,
>> > but I do not remember if we tried hammering.
>>
>> So you actually know that "tempered glass" is not the amazing "new"
>> discovery that Worm-group purported it to be, yet you still defend the
>> incompetent science of these clowns? What is the matter with you?

> There is always somebody who takes old news as new ones.

Einstein said the only thing he knew to be infinite was human stupidity.

> And as I said, I am well rooted in science, having good background,
> so I am able to distinguish.

Prove it.

> There is strong correlation between dirty vocabulary and lack of proper
> physical knowledge.

Cite.

Are you saying Harlow is an idiot?