Normal contact stiffness of fractal rough surfaces

• Autorzy: Buczkowski R. , Kleiber M. , Starzynski G.
• Języki publikacji: EN

Abstrakty

EN

We used the fractal theory based on a single variable Weierstrass–Mandelbrot function to obtain the normal contact stiffness if rough and smooth isotropic surfaces are pressed against each other. Because in the original fractal theory the distribution of contact area is assumed geometrically, we propose the method in which the actual deformation of asperities and a correction due to asperity coupling (interaction) will be taken into account. This correction is equivalent to an increase of the effective separation by a quantity proportional to the nominal pressure and it has a significant effect on contact stiffness at larger normal loads (low separations). The numerical results demonstrate a nonlinear evolution of the contact stiffness with the normal load in particular in the first stage of loading at low squeezing pressures. We have compared the results of the theoretical contact stiffness using the fractal method with the experimental ultrasonic measurements. Experimental results made on real surfaces agree remarkably well with the theoretical predictions.

Słowa kluczowe

EN

fractal model; contact stiffness; ultrasonic measurements

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Archives of Mechanics
• Rocznik: 2014
• Tom: Vol. 66, nr 6
• Strony: 411–--428
• Opis fizyczny: Bibliogr. 46 poz., rys. kolor.

Twórcy

autor

Buczkowski R.

• Division of Computer Methods, Maritime University of Szczecin Pobożnego 11, 70-507 Szczecin, Poland

autor

Kleiber M.

• Institute of Fundamental Technological Research. Polish Academy of Sciences Pawinskiego 5B, 02-106 Warsaw, Poland

autor

Starzynski G.

• Institute of Fundamental Technological Research. Polish Academy of Sciences Pawinskiego 5B, 02-106 Warsaw, Poland

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