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ASTM E1300 X6. Approximate Maximum Surface Stress

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Mat.

Structural
Jul 26, 2018
1
US
Regarding Appendix X6 in the ASTM E1300, does anyone know where more information can be found on the variables k and n. I ask because in this appendix they refer to n as 16 for annealed glass, but what about HS and FT? Also, k, the surface flaw parameter has no given value or units or mentioned else where at all.

I also don't see how this equation produces a stress in terms of psi or psf as none of the variables include force. See below for the snip of the equation and its variables:

X6_Equation_zs6wwf.png


Does anyone have any experience using this equation? Any info is much appreciated.

Thanks.
 
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