<VV> windshield removal (Now Chip Removal)

[RoboMan91324 at aol.com]

Hi Joe,

I forget the formula but the concept is that the tendency for a brittle 
substance such as glass to propagate a crack is in reverse proportion to the radius 
of the initial crack.  In effect, a scallop in the edge of the glass with a 
1/2 inch radius will probably not propagate, with conditions.  However, if 
there is a sharp crack in the edge, it will probably travel further when any 
stress is put on it.  Keep in mind that sometimes the large diameter scallop in the 
edge also comes with a few sharp fractures.  It is these tiny radius 
fractures that propagate, not the scallop.  Look closely at the edge for tiny cracks 
and grind/sand them away.  Even when working with metals, designers know that 
they need to use fillets at corners or you run the risk of starting a stress 
crack.

Doc
~~~~~~~~~~
In a message dated 3/1/2005 10:17:03 AM Pacific Standard Time, 
virtualvairs-request at corvair.org writes:

> Message: 3
> Date: Tue, 1 Mar 2005 12:20:11 -0500
> From: "N. Joseph Potts" <pottsf at msn.com>
> Subject: RE: <VV> VV: Re: windshield removal
> To: <virtualvairs at corvair.org>
> Message-ID: <BAY0-SMTP023E1A2707A00E8057B48ECF590 at phx.gbl>
> Content-Type: text/plain;    charset="us-ascii"
> 
> How does "cleaning up" a chip "remove any stress raisers?" How does this
> work, and what is it? I know what a chip is, and I know what emery paper is,
> but the rest has got me guessing.
> 
> Joe Potts
> Miami, Florida USA
> 1966 Corsa coupe 140hp 4-speed with A/C and cracked windshield (too late for
> me)