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danny boy 
Member - Posts: 14
Member spacespace
Joined: May 11, 2006
Location: Australia
Posted: May 16, 2006 at 8:19 AM / IP Logged  

hi i heard of someone that 150 db is shattering point for glass is this true if not what is the shattering point??

crzyvs
russ lund 
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Joined: April 07, 2004
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Posted: May 16, 2006 at 9:48 AM / IP Logged  
You can't say for sure what point Db wise.But the way to break the glass besides a hard sharp object,is to find the resonant frequency of the piece of glass (ie: the windshield) and blast the hell out of it..
BigDog
luckydevil 
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Posted: May 16, 2006 at 10:07 AM / IP Logged  
I heard the Mythbusters crew was at a recent SPL competitiion in Orlando filming for an upcoming episode on the windshield myth. I'm very interested to see their analysis and what they come up with.
AJRXtreme 
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Posted: May 16, 2006 at 10:10 AM / IP Logged  

Ive sat inside a 153db blazer and his windows sure flexed but didnt shatter.

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haemphyst 
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Posted: May 16, 2006 at 6:03 PM / IP Logged  
luckydevil wrote:
I heard the Mythbusters crew was at a recent SPL competitiion in Orlando filming for an upcoming episode on the windshield myth. I'm very interested to see their analysis and what they come up with.
SWEET... Where'd ya hear that? I'll be DVRing that for sure! L-O-V-E those guys!
"I reject your reality, and substitue my own!" LOL
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Master Asylum 
Silver - Posts: 400
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Joined: November 05, 2004
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Posted: May 16, 2006 at 6:18 PM / IP Logged  
I'd really like to know if anyone has info concerning this. I'm kinda tired of local people coming in and saying people have blown out their windows and such. I really doubt there's that many people with the money, time, talent, and investment into it to successfully pull this off.
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zhalverson 
Copper - Posts: 180
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Joined: January 21, 2005
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Posted: May 17, 2006 at 12:59 AM / IP Logged  

Just my 2 cents but glass is a very difficult thing to put any specific failure point on.  In my materials class at college we were doing destructive testing on a variety of materials; plastics, metals, and glass.  Metals, and plastics for the most part, fail in a predictable manner.  On the other hand glass definately does not.  Glass is predicted to fail in a statistical manner, that is an average can be determined.  Often times failure can occur far from the average on both sides.  So my guess is that it is possible for people to blow their windows out but it is just isolated incidences.  Like mentioned above the resonant frequency of the glass would adversely affect this though.

Oh yeah, mythbusters is such a cool show, I hope they do have that episode to put this question to rest.shattering point -- posted image.

jt824 
Copper - Posts: 52
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Joined: March 17, 2006
Location: United States
Posted: May 17, 2006 at 1:06 AM / IP Logged  

How did your ears feel from that pressure?

AJRXtreme wrote:

Ive sat inside a 153db blazer and his windows sure flexed but didnt shatter.

jeffchilcott 
Platinum - Posts: 2,483
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Joined: April 11, 2002
Location: United States
Posted: May 17, 2006 at 7:49 AM / IP Logged  
We have some videos on our site of 150.6 with no one on the glass and yes, it will flex like mad.   they are also on realm of excursion under the competiton pages.
Typically you will not shatter glass untill aproaching the 165db range, the only other was is like said if a sharp object hits or rattles aginst it.
Yes Mythbusters was at Spring Bash, A DB drag show.   It is supposed to air late this season sometime, if I get more info I will let ytou all know.   But I will say this, no one shattered thier window.
I do have a video of the riley's shattering thier window at over 170db, I will have to post it later today so you all can see it.
2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
jeffchilcott 
Platinum - Posts: 2,483
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Joined: April 11, 2002
Location: United States
Posted: May 17, 2006 at 8:12 AM / IP Logged  
i dont know if the link will work, if not I will try to post again later
http://s11.photobucket.com/albums/a191/sugarbailey2/?action=view¤t=arts.flv
2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
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