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Message no. 1
From: acgetchell@*******.edu (Adam Getchell)
Subject: Materials
Date: Sun, 21 Apr 1996 05:09:42 -0700
Checking _Introduction to Materials Science for Engineers, 4ed_ I find:

Density g/cm^3 Melting Point (degrees Celcius)

Osmium 22.58 3033
Iridium 22.55 2447
Platinum 21.44 1769
Rhenium 21.02 3186
Tungsten 19.25 3422
Uranium 19.05 1135

Osmium is the densest material, followed by Iridium. Tungsten stuck in my
head for its outstanding hardness and temperature properties, as it
possesses the highest melting point of all the unalloyed metals.

Though of course, as far as bullet penetration goes, there is a certain
point whereat penetration is more dependent upon kinetic energy than bullet
hardness.

=================================================================
Adam Getchell
acgetchell@*******.edu
http://www.engr.ucdavis.edu/~acgetche/
=================================================================

"Invincibility is in oneself, vulnerability in the opponent."
-- Sun Tzu
Message no. 2
From: Kenneth Horner <kwhorner@*******.edu>
Subject: Re: Materials
Date: Sun, 21 Apr 1996 13:10:06 -0700 (PDT)
On Sun, 21 Apr 1996, Adam Getchell wrote:

> Checking _Introduction to Materials Science for Engineers, 4ed_ I find:
>
> Density g/cm^3 Melting Point (degrees Celcius)
>
> Osmium 22.58 3033
Extremely rare. Density 22.61 MP about 2700
> Iridium 22.55 2447
Density 22.65 also quite rare.
> Platinum 21.44 1769
A might expensive for bullets....
> Rhenium 21.02 3186
Forget getting your hands on this, there is next to none on the earth.
> Tungsten 19.25 3422
Hardness 6.5-7.5 where diamond is a 10. Pretty rare.
> Uranium 19.05 1135
When they refer to uranium shells or bullets, it's U-238 w/o the radioactive
U-235, making it a lot safer to use. Gotta keep it air-tight or it will
oxidize and combust at 150-175C. Salts are very toxic.
>
> Osmium is the densest material, followed by Iridium. Tungsten stuck in my
> head for its outstanding hardness and temperature properties, as it
> possesses the highest melting point of all the unalloyed metals.
The Merck Index, Centennial(1989) edition says that recent X-ray spectroscopy
has proven Irirdium to be the densest material, overtruning the previous
opinion that Osmium was. All my data comes from there, but I'll check at
the library this weekend
>
> Though of course, as far as bullet penetration goes, there is a certain
> point whereat penetration is more dependent upon kinetic energy than bullet
> hardness.
>
Quite true.

Nutcracker
Message no. 3
From: acgetchell@*******.edu (Adam Getchell)
Subject: Re: Materials
Date: Sun, 21 Apr 1996 16:32:35 -0700
I was not commenting on material availability, though I agree with your
comments and are aware of the various rarities of certain materials.

>> Osmium 22.58 3033
>Extremely rare. Density 22.61 MP about 2700

I should like to see your source, as mine is fairly recent (1996) and the
basis for materials science and engineering classes here at UCD (which, I
see, you are also attending).

>When they refer to uranium shells or bullets, it's U-238 w/o the radioactive
>U-235, making it a lot safer to use.

Yes, that's where the "depleted" comes from in "Depleted Uranium".

>The Merck Index, Centennial(1989) edition says that recent X-ray spectroscopy
>has proven Irirdium to be the densest material, overtruning the previous
>opinion that Osmium was. All my data comes from there, but I'll check at
>the library this weekend

Haven't seen this. Please check ... my materials prof would be interested,
as well. His data appears to be more recent, though the tables may just be
retained from earlier editions.

>Nutcracker

=================================================================
Adam Getchell
acgetchell@*******.edu
http://www.engr.ucdavis.edu/~acgetche/
=================================================================

"Invincibility is in oneself, vulnerability in the opponent."
-- Sun Tzu
Message no. 4
From: "Andre' Selmer" <031ANDRE@******.wits.ac.za>
Subject: Re: Materials
Date: Mon, 22 Apr 1996 10:36:09 GMT + 2:00
@ > Platinum 21.44 1769
@ A might expensive for bullets....

Cough, Cough. We calulated that our bullets (the oricalcum tipped
ones) cost about 15,000 each.

Andre'

-- We exist because you want us to, because you are
|__|__ afraid to fact the facts. We are what you fear
/\ /\ \ in the deep recesses of your soul, yourselves.
|\ /\ /| | It is there in the shadows of your soul and those
|/ \/ \| | of the street that we exist. Through the use of
\/__\/ might, magic, cunning, blood, sweat and tears we
protect you from your fears, from youselves, from
others and keep your utopia, not ours, intact.

Further Reading

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