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Adhesion enhancement in a dimpled surface with axisymmetric waviness and rate-dependent work of adhesion

Submitted by Antonio Papangelo on
research
Adhesion and fracture; adhesion; contact mechanics; friction; viscoelasticity

Surfaces showing macroscopic adhesion are rare in industry, but are abundant in Nature. Adhesion enhancement has been discussed mostly with geometrical systems (e.g. patterned surfaces), more rarely with viscoelasticity, and has the goal of increasing hysteresis and the detachment force at separation. Soft materials are common, and these have viscoelastic properties that result in rate-dependent increase of toughness.

A magnetoelastic theory for Kirchhoff rods having uniformly distributed paramagnetic inclusions and its buckling

Submitted by Ajeet Kumar on
research
Kirchhoff rod
Magnetoelasticity
buckling
soft continuum robots

We present a theory for finite and spatial elastic deformation of rods under the influence of arbitrary magnetic field and boundary condition. The rod is modeled as a Kirchhoff rod and is assumed to have uniformly distributed array of uniaxial spheroidal paramagnetic inclusions embedded in it all pointing in the same direction in the undeformed state. The governing equations of the magnetoelastic rod are derived which are further non-dimensionalized and linearized to investigate buckling in such rods.

How to better grasp your spoon?

Submitted by Antonio Papangelo on
research
Adhesion and fracture; adhesion; contact mechanics; friction

How can shear loading rate affect the soft adhesive contact area? A new blog post in tribonet.org discusses the problem following the paper "Papangelo, Antonio. (2021). On the Effect of Shear Loading Rate on Contact Area Shrinking in Adhesive Soft Contacts. Tribology Letters. 69." just published in Tribology Letters.

Superelasticity and shape memory effect in zirconia nanoparticles

Submitted by mohsenzaeem on
research
Superelasticity; shape memory; YSTZ; atomistic simulations

In this work, superelastic and shape memory properties of single crystalline and polycrystalline yttria stabilized tetragonal zirconia (YSTZ) nanoparticles are studied by atomistic simulations. N. Zhang and M. Asle Zaeem. Superelasticity and shape memory effect in zirconia nanoparticles. Extreme Mechanics Letters 46 (2021) 101301 (8 pages).

Ph.D. Call Doctoral School in Civil, Environmental and Mechanical Engineering - University of Trento, Trento, Italy

Submitted by oreste.bursi on
research

- Reference persons: Marco Broccardo (UNITN/DICAM), Oreste S. Bursi (UNITN/DICAM) (marco.broccardo [at] unitn.it - oreste.bursi [at] unitn.it)

C8 - scholarship on reserved topics

https://www.unitn.it/en/ateneo/1954/announcement-of-selection

Funded by: MUR – Departments of Excellence

Computing wrinkling and restabilization of stretched sheets based on a consistent finite-strain plate theory

Submitted by Fan Xu on
research
bifurcation
hyper elasticity

It was reported both in experiments and computations using some classical plate theories that wrinkles can appear in a uniaxially stretched rectangular hyperelastic film with clamped-clamped boundaries and can be suppressed upon further tension. Here, based on a recently-available consistent finite-strain plate theory, we investigate this complex instability problem with isola-center bifurcation (the nontrivial solution curve begins and ends at two distinct points on the trivial line) in more depth and present an efficient numerical algorithm.

Effects of Cleavage Plane and Material Strength on Fracture of Polycrystalline Brittle Materials: A Phase-Field Modeling Study

Submitted by mohsenzaeem on
research
crack; fracture; polycrystalline; phase-field modeling

A modified phase-field model for fracture is presented which includes the material strength and cleavage planes to quantitatively predict the crack propagation path and the mechanical response in polycrystalline brittle materials. Computational Materials Science 197 (2021) 110642 (11 pages).

Mathematically exploring wrinkle evolution

Submitted by Fan Xu on
research
hyper elasticity
thin film

Wrinkling is one of the most important mechanical deformation modes (for example, buckling and crumpling) that are omnipresent in our daily life: for instance, wrinkled fingers after soaking in water for a prolonged time, the folds within the brain, and metal wrinkles after a car collision, to name a few.

EML Webinar (Season 2) by Ju Li, on 16 June 2021: Elastic Strain Engineering for Unprecedented Properties

Submitted by Teng Li on
research
EML Webinar
EML

EML Webinar (Season 2) on 16 June 2021 will be given by Ju Li, MIT. Elastic Strain Engineering for Unprecedented Properties. Discussion Leaders: Sulin Zhang, The Pennsylvania State University

Time: 10 am Boston, 3 pm London, 10 pm Beijing on 16 June 2021

Zoom Link: https://ter.ps/EMLWebinarS2

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