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Roughness

Wavelengths of surface features

Submitted by r.nikhil on Tue, 2011-03-01 15:59.

I am working on the surface features of steel . I understand that surface features are broken down into various wavelengths and represented as Wa to We (0.1mm to 30mm wavelengths). Could some guide me to a reference which shows how to go about this process from the raw surface profile data ? Possibly, it involves Fourier Transforms, but I need a basic reference which shows how it is done .

 

Thanks!

 


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NANOVEA's picture

Fiberglass Roughness & Flatness With 3D Metrology

Submitted by NANOVEA on Fri, 2010-01-22 22:59.

Fiber GlassAlthough there are many uses for Fiberglass reinforcement, in most applications it is crucial

that they are as strong as possible. Fiberglass composites have one of the highest strength to

weight ratios available and in some cases, pound for pound it is stronger than steel. It is also


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Henry Tan's picture

Surface roughness evolution

Submitted by Henry Tan on Sun, 2007-04-29 17:52.

With a shallow chemical etching the roughness with spatial frequency below a critical value grows while the roughness of higher frequency decays.

http://imechanica.org/node/1312


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Jim Barber's picture

Surface Roughness and Electrical Contact Resistance

Submitted by Jim Barber on Wed, 2007-01-10 22:02.

J.R.Barber The contact of rough surfaces Surfaces are rough on the microscopic scale, so contact is restricted to a few `actual contact areas'. If a current flows between two contacting bodies, it has to pass through these areas, causing an electrical contact resistance. The problem can be seen as analogous to a large number of people trying to get out of a hall through a small number of doors.

Classical treatments of the problem are mostly based on the approximation of the surfaces as a set of `asperities' of idealized shape. The real surfaces are represented as a statistical distribution of such asperities with height above some datum surface. However, modern measurement techniques have shown surfaces have multiscale, quasi-fractal characteristics over a wide range of length scales. This makes it difficult to decide on what scale to define the asperities.


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