Browser
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| posted on 14/6/06 at 01:47 AM |
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Some people must be smoking odd substances.......
....when they post ads on Ebay. Have a gander at this snippet, taken from an ad for a storage box to fit to the front of a trailer tent:
"MADE OUT OF GRP (glass reinforced plastic - fibreglass) WHICH IS STRONGER THAN STEEL BUT MUCH LIGHTER AND FITTED WITH A SECURITY LOCK AND KEY
(2 keys supplied)"
Stronger than steel eh? SO if you smack a 5mm sheet of steel with a hammer it shatters does it? And you can make roll cages out of GRP can you?
Eejit! 
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mangogrooveworkshop
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| posted on 14/6/06 at 02:04 AM |
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Why try to dazzel them with diamonds when you can baffel them with bullshit!
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Danozeman
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| posted on 14/6/06 at 05:35 AM |
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quote:
Why try to dazzel them with diamonds when you can baffel them with bullshit!
Excactly!!!! There are some exceptionaly dim people about.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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iank
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| posted on 14/6/06 at 08:38 AM |
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It rather depends on the construction of the box, but I presume he's quoting tensile strength pub talk rather than impact resistance pub
talk.
At the risk of being called an eejit/dim, weight for weight GRP (parallel roving) can have a rather higher tensile strength than mild
steel.
GRP Parallel Roving - 550-900 MPa
Structural steel ASTM-A36 - 650 MPa
refs:
http://irc.nrc-cnrc.gc.ca/pubs/cbd/cbd205_e.html
http://en.wikipedia.org/wiki/Tensile_strength
Hitting a 5mm sheet of steel and a 5mm piece of GRP isn't a very fair test of strength anyway IMO.
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David Jenkins
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| posted on 14/6/06 at 09:09 AM |
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quote:
Originally posted by iank
I
Hitting a 5mm sheet of steel and a 5mm piece of GRP isn't a very fair test of strength anyway IMO.
But it's what a villain would do if he wanted to steal the tools...
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iank
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| posted on 14/6/06 at 10:14 AM |
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quote:
Originally posted by David Jenkins
quote:
Originally posted by iank
I
Hitting a 5mm sheet of steel and a 5mm piece of GRP isn't a very fair test of strength anyway IMO.
But it's what a villain would do if he wanted to steal the tools...
A fair test of the material choice for a tool box yes, not for comparing GRP to steel strength. If the box was built from 25mm thick GRP roving built
up in layers (similar weight I think) it would be a fairer test and I'd guess a closer result even on impact testing
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Browser
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| posted on 14/6/06 at 06:55 PM |
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I was thinking more it's ability to resist being dropped
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trogdor
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| posted on 14/6/06 at 09:23 PM |
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i am not sure if steel or fibreglass is stronger, but they differ majorly in their physical properties. ie steel as an metal is mallable, so it will
absorb shocks as dents etc, where as glassfibre isn't mallable as will absorb shock up to the point where it will shatter.
i believe Glassfibre absorbs smaller shocks better than steel, ie no dents etc but will shatter and fail well before steel will.
however it all depends on the construction of said objects and materials! ideally u would want it made out of titanium!
[Edited on 14/6/06 by trogdor]
[Edited on 14/6/06 by trogdor]
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Browser
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| posted on 14/6/06 at 10:11 PM |
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Titanium? Naaah mate, unobtanium's much better
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iank
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| posted on 15/6/06 at 08:05 AM |
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Nice thick rubber with steel bands inside for the best of both worlds
Other things to think about are corrosion resistance and the 'dropped it on my foot' weight test
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trogdor
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| posted on 15/6/06 at 10:57 AM |
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actaully titanium is one of the most aboundant minerals on the earth, for metals only iron has a greater amount. this in thery means it should be
cheap as its very easily found within its ore.
unlike iron which is easily removed from its ore, titanium requires an expensive method to enable extraction. i can't quite remember off the top
of my head but it uses expensive and toxic chemicals as well as aluminum. this is another reason why its expensive, as bauxite, aluminum's ore
is not that common and is also not cheap to extract.
if someone could come up with an cheap extraction method they would be very rich as this method is highly sought after
apoligies for wandering, i always like to use my a level knowledge whenever i can, makes it feel like it was worthwhiile!
[Edited on 15/6/06 by trogdor]
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