In many biological structures, optimized mechanical properties are obtained through complex structural organization involving multiple constituents, functional grading and hierarchical organization. In the case of biological surfaces, the possibility to modify the frictional and adhesive behaviour can also be achieved by exploiting a grading of the material properties. In this paper, we investigate this possibility by considering the frictional sliding of elastic surfaces in the presence of a spatial variation of the Young’s modulus and the local friction coefficients. Using finite-element simulations and a two-dimensional spring-block model, we investigate how graded material properties affect the macroscopic frictional behaviour, in particular, static friction values and the transition from static to dynamic friction. The results suggest that the graded material properties can be exploited to reduce static friction with respect to the corresponding non-graded material and to tune it to desired values, opening possibilities for the design of bioinspired surfaces with tailor-made tribological properties.

Evidence of friction reduction in laterally graded materials

Costagliola, Gianluca;Bosia, Federico;
2018-01-01

Abstract

In many biological structures, optimized mechanical properties are obtained through complex structural organization involving multiple constituents, functional grading and hierarchical organization. In the case of biological surfaces, the possibility to modify the frictional and adhesive behaviour can also be achieved by exploiting a grading of the material properties. In this paper, we investigate this possibility by considering the frictional sliding of elastic surfaces in the presence of a spatial variation of the Young’s modulus and the local friction coefficients. Using finite-element simulations and a two-dimensional spring-block model, we investigate how graded material properties affect the macroscopic frictional behaviour, in particular, static friction values and the transition from static to dynamic friction. The results suggest that the graded material properties can be exploited to reduce static friction with respect to the corresponding non-graded material and to tune it to desired values, opening possibilities for the design of bioinspired surfaces with tailor-made tribological properties.
2018
9
1
2443
2456
https://www.beilstein-journals.org/bjnano/content/pdf/2190-4286-9-229.pdf
Bio-inspired materials; Friction; Functionally graded materials; Numerical simulations; Materials Science (all); Physics and Astronomy (all); Electrical and Electronic Engineering
Guarino, Roberto; Costagliola, Gianluca; Bosia, Federico; Pugno, Nicola Maria
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1685116
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