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On mixed-mode fracture mechanics models for contact area reduction under shear load in soft materials

Mon, 2018-10-01 10:19 - Antonio Papangelo
research
Adhesion and fracture; adhesion; contact mechanics; friction;

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.

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Congratulations to Prof. M. Ciavarella, new member of IJMS editorial board!

Tue, 2018-02-20 04:36 - Antonio Papangelo

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-sc...

Congratulations!

Antonio

 

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Adhesion between a power-law indenter and a thin layer coated on a rigid substrate

Sat, 2018-02-03 05:25 - Antonio Papangelo
research
adhesion; contact mechanics; bioinspired adhesion; nanolayers; microlayers

Abstract: In the present paper we investigate indentation of a power-law axisymmetric rigid probe in adhesive contact with a "thin layer" laying on a rigid foundation for both frictionless unbounded and bounded compressible cases. The investigation relies on the "thin layer" assumption proposed by Johnson, i.e. the layer thickness being much smaller than the radius of the contact area, and it makes use of the previous solutions proposed by Jaffar and Barber for the adhesiveless case.

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Multiple spatially localized dynamical states in friction-excited oscillator chains

Mon, 2017-12-11 14:23 - Antonio Papangelo
research
Coulomb friction; nonlinear dynamics; friction induced vibrations; bistability
  • Journal of Sound and Vibration

 

A. Papangelo (a,*), N. Hoffmann (a,b), A. Grolet (c), M. Stender (a), M. Ciavarella (d)

a) Hamburg University of Technology, Department of Mechanical Engineering, Am Schwarzenberg-Campus 1, 21073, Hamburg, Germany

b) Imperial College London, Exhibition Road, London, SW7 2AZ, UK

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Discussion of “Measuring and Understanding Contact Area at the Nanoscale: A Review” by Tevis D. B. Jacobs and Ashlie Martini

Fri, 2017-10-13 13:11 - Antonio Papangelo
research
adhesion; contact mechanics; rough contact

M. Ciavarella(1) and A. Papangelo(2)

(1) Politecnico di BARI, Center of Excellence in Computational Mechanics, Deparment of Mechanics, Mathematics and Management. Viale Gentile 182. 70125 Bari (Italy)

(2) Hamburg University of Technology, Department of Mechanical Engineering, Am Schwarzenberg-Campus 1, 21073 Hamburg, Germany

michele.ciavarella@poliba.it, antonio.papangelo@poliba.it

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Load-separation curves for the contact of self-affine rough surfaces

Tue, 2017-08-01 06:38 - Antonio Papangelo
research
contact mechanics; rough contact
load-separation curves;

Load separation curves between self-affine rough surfaces have been studied by means of extensive numerical simulations. The results of the comparison with the two main contact mechanics theories have been reported. https://www.nature.com/articles/s41598-017-07234-4

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Cyclic response of friction damped mechanical systems - PhD thesis - part II

Fri, 2017-03-17 05:49 - Antonio Papangelo
vibration
friction
localization
pattern formation
Damping

This is the "part II" of my PhD thesis.

It addresses the problem of finding the dynamic cyclic response of mechanical systems experiencing dry friction with a particular focus on the influence of varying normal and tangential loads. I first start from a single degree of freedom model and gradually increase the complexity of the system. In the last chapter I address a system with 12 degrees of freedom which shows localized vibration states, that are very similar to solutions known in other physics fields like optics and fluid dynamics. 

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Stick-Slip transition in dry friction - PhD thesis -part I

Fri, 2017-03-17 05:12 - Antonio Papangelo
stick-slip
Coulomb friction
dry friction
Griffith friction

This is the "part I" of my PhD thesis.

It addresses the problem of the stick-slip transition at an interface experiencing dry friction taking inspiration from the experiments led by Prof. Fineberg, where for the first time, an high speed camera has been used to visualize how the contact interface evolves when stick-slip transition occurs.   

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A note on the pull-off force for a pattern of contacts distributed over a halfspace

Sat, 2017-03-11 14:44 - Antonio Papangelo
research
structured surfaces - adhesion - biomimetics - Pull-off force

Article in Meccanica · March 2017 --- We found a very simple formula for pull-off force for a pattern of contacts distributed over an halfspace which could be very useful in predicting the adhesive propreties of structured surfaces, as bioinspired surfaces.  

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