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Engineering
Materials and Chemical Engineering
Material index formulas for optical clarity and Ashby charts
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[QUOTE="LT72884, post: 6479646, member: 244063"] Hello:) i need some help trying to find some formulas that i can retrive the material index from at the end of simplification to use with an ashby chart to select materials. here is an example of deflection equation from a sphere used for a spherical cap and what material index we used to find our material. Deflection: d=(pr²)/2Et If mass is equal to density multiplied by volume, we can derive an equation for thickness: m=𝞺at m=𝞺(2rh)t t=m/𝝆2rh d=((pr²)/2E)*m/𝝆a solve for m to find the material index m=pr³h𝝆/dE 𝝆/E is our material index and should be minimized, or E/𝝆 should be maximized. the last material index i need to find is for optical clarity, how well you can see through it. We are making a visor for a helmet. So it needs to be clear and non reflective, but i don't know how to find the material index because i do not know of any equations used for optical clarity. thanks. [/QUOTE]
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Material index formulas for optical clarity and Ashby charts
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