Shear-induced contact area anisotropy explained by a fracture mechanics model
A. Papangelo, J. Scheibert, R. Sahli, G. Pallares, and M. Ciavarella
Phys. Rev. E 99, 053005 - https://journals.aps.org/pre/abstract/10.1103/PhysRevE.99.053005
Antonio Papangelo's blog
Shear-Induced Anisotropy in Rough Elastomer Contact
R. Sahli, G. Pallares, A. Papangelo, M. Ciavarella, C. Ducottet, N. Ponthus, and J. Scheibert
Phys. Rev. Lett. 122, 214301 – https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.214301
Adhesion of multilayered materials
Adhesion is a key factor in many tribological processes, especially wear. We generalize a recent formulation for the indentation of a multilayered material using an efficient integral transform method, to the case of adhesion, using a simple energetic transformation in the JKR regime. Then, we specialize the study for the geometry of the Surface Force Apparatus, which consists of two thin layers on a substrate, where the intermediate layer is softer than the other two. We find the pull-off force under "force control" (i.e.
The role of adhesion in contact mechanics
Just published in Journal of the Royal Society Interface
Ciavarella M, Joe J, Papangelo A, Barber JR. 2019 The role of adhesion in contact mechanics. J. R. Soc. Interface 16: 20180738. http://dx.doi.org/10.1098/rsif.2018.0738
On unified crack propagation laws
The anomalous propagation of short cracks shows generally exponential fatigue crack growth but the dependence on stress range at high stress levels is not compatible with Paris’ law with exponent m=2. Indeed, some authors have shown that the standard uncracked SN curve is obtained mostly from short crack propagation, assuming that the crack size a increases with the number of cycles N as da/dN=H\Delta\sigma^h where h is close to the exponent of the Basquin’s power law SN curve.
Bio-inspired solution for optimal adhesive performance
In recent years there has been a growing interest into high performance bioinspired adhesives. This communication focuses on the adhesive behavior of a rigid cylinder that indents an elastic layer coated on a rigid substrate. With the assumption of short range adhesive interactions (JKR type) the adhesive solution is obtained very easily starting from the adhesiveless one.
Multistability and localization in forced cyclic symmetric structures modelled by weakly-coupled Duffing oscillators
Many engineering structures are composed of weakly coupled sectors assembled in a cyclic and ideally symmetric configuration, which can be simplified as forced Duffing oscillators. In this paper, we study the emergence of localized states in the weakly nonlinear regime. We show that multiple spatially localized solutions may exist, and the resulting bifurcation diagram strongly resembles the snaking pattern observed in a variety of fields in physics, such as optics and fluid dynamics.
On mixed-mode fracture mechanics models for contact area reduction under shear load in soft materials
The fundamental problem of friction in the presence of macroscopic adhesion, as in soft bodies, is receiving interest from many experimentalists. Since the first fracture mechanics 'purely brittle' model of Savkoor and Briggs, models have been proposed where the mixed mode toughness is interpreted with phenomenological fitting coefficients introducing weaker coupling between modes than expected by the "purely brittle" model.
On the connection between Palmgren-Miner’s rule and crack propagation laws
M.Ciavarella, P.D’Antuono, A.Papangelo
Politecnico di Bari, 70125 Bari, Italy. mciava [at] poliba.it
Abstract
Congratulations to Prof. M. Ciavarella, new member of IJMS editorial board!
Congratulations to Prof. M. Ciavarella for having been nominated a new member of the International Journal of Mechanical Sciences (IJMS) Editorial Board! IJMS is a well-established Journal published by Elsevier. With its Impact Factor being 2.884 in 2016, IJMS ranks No. 15 among 133 journals in the field of Mechanics!
https://www.journals.elsevier.com/international-journal-of-mechanical-s…
Congratulations!
Antonio