User login

Navigation

You are here

Luca-Deseri's blog

Luca-Deseri's picture

Mechanotropism of single cells adhering to elastic substrates subject to exogenous forces

Adherent cells are able to actively generate internal forces, channeled by cytoskeletal protein filaments and transmitted through transmembrane receptors to the surrounding environment by means of focal adhesions.

Luca-Deseri's picture

Uniaxial stretch-release of rubber-plastic bilayers: strain dependent transition to stable helices, rolls, saddles, and tubes

Polymeric plastics deform irreversibly (i.e., inelastically) whereas rubbers deform reversibly, i.e., elastically.

Thus, uniaxially stretching a rubber-plastic bilayer composite beyond its yield point can create an elastic strain mismatch between the two layers. Upon release, the bilayer may then bend out-of-plane.

Luca-Deseri's picture

Bulky auxeticity, tensile buckling and deck-of-cards kinematics emerging from structured continua

Complex mechanical behaviours are generally met in macroscopically homogeneous media as effects of inelastic responses or as results of unconventional material properties, which are postulated or due to structural systems at the meso/micro-scale.

Examples are strain localization due to plasticity or damage and metamaterials exhibiting negative Poisson’s ratios resulting from special porous, eventually buckling, sub-structures.

Luca-Deseri's picture

Mechanobiology predicts raft formations triggered by ligand-receptor activity across the cell membrane

Carotenuto A., Lunghi L., Piccolo V., Babaei M., Dayal K., Pugno N. M., Zingales M., Deseri L.*, Fraldi M. Mechanobiology predicts raft formations triggered by ligand-receptor activity across the cell membrane, Journal of the Mechanics and Physics of Solids 141 (2020) 103974 https://doi.org/10.1016/j.jmps.2020.103974
*Corresponding Author

Luca-Deseri's picture

Fractional-order nonlinear hereditariness of tendons and ligaments of the human knee

By Emanuela Bologna, Mario Di Paola, Kaushil Dayal, Luca Deseri and Massimiliano Zingales.

In this paper the authors introduce a nonlinear model of fractional-order hereditariness used to capture experimental data obtained on human tendons of the knee. Creep and relaxation data on fibrous tissues have been obtained and fitted with logarithmic relations that correspond to power-laws with nonlinear dependence of the coefficients. The use of a proper nonlinear transform allows one to use Boltzmann superposition in the transformed variables yielding a fractional-order model for the nonlinear material hereditariness. The fundamental relations among the nonlinear creep and relaxation functions have been established, and the results from the equivalence relations have been contrasted with measures obtained from the experimental data. Numerical experiments introducing polynomial and harmonic stress and strain histories have been reported to assess the provided equivalence relations.

This article is part of the theme issue ‘Advanced materials modelling via fractional calculus: challenges and perspectives’ on Philosophical Transactions of the Royal Society A.

Bologna E, Di Paola M, Dayal K, Deseri L, Zingales M. 2020 Fractional-order nonlinear hereditariness of tendons and ligaments of the human knee. Phil. Trans. R. Soc. A 378: 20190294.
http://dx.doi.org/10.1098/rsta.2019.0294

Subscribe to RSS - Luca-Deseri's blog

Recent comments

More comments

Syndicate

Subscribe to Syndicate