A postdoctoral and graduate student openings with the main focus on the mechanics of composites materials are available immediately in Shakiba's group. We are looking for strongly motivated candidates to work on an AFOSR supported project on 1) thermo-mechanical damage coupling in FRPs, 2) simulation of additively manufactured composites and 3) sensitivity and machine learning for damage predictions.
EML Webinar on 23 September 2020 will be given by Marc Geers, Eindhoven University of Technology, Discussion leader: Laurence Brassart, Oxford University.
Title: Title: Multi-scale homogenization of materials with an emergent macroscopic behaviour
Time: 7 am California, 10 am Boston, 3 pm London, 10 pm Beijing on 23 September 2020
Tribological behavior of graphene layers has been a focus of intensive research interest since its crystal lattice structure can be exploited to achieve incommensurate contact, leading to nearly zero friction, namely structural superlubricity. However, wrinkling undulations are omnipresent on graphene and difficult to be completely eliminated, which inevitably resists superlubricity in reality. Here, we explore how the presence of surface wrinkles affects nanotribological behavior of graphene sliding systems.
Ericksen's problem consists of determining all equilibrium deformations that can be sustained solely by the application of boundary tractions for an arbitrary incompressible isotropic hyperelastic material whose stress-free configuration is geometrically flat. We generalize this by first, using a geometric formulation of this problem to show that all the known universal solutions are symmetric with respect to Lie subgroups of the special Euclidean group. Second, we extend this problem to its anelastic version, where the stress-free configuration of the body is a Riemannian manifold.
The Special Issue "Advances in Elastic Micro-Structured Systems and Metamaterials", that will be published in Applied Sciences (Impact Factor: 2.474), is open to receive submissions for peer-review and possible publication.
The aims and scope can be found at the following link:
https://www.mdpi.com/journal/applsci/special_issues/elastic_micro_struc…
Surface instability of compliant film/substrate bilayers has raised considerable interests due to its broad applications such as wrinkle-driven surface renewal and antifouling, shape-morphing for camouflaging skins, and micro/nano-scale surface patterning control. However, it is still a challenge to precisely predict and continuously trace secondary bifurcation transitions in the nonlinear post-buckling region. Here, we develop lattice models to precisely capture the nonlinear morphology evolution with multiple mode transitions that occur in the film/substrate systems.
EML Webinar on 16 September 2020 will be given by Prof. Rob Shepherd, Cornell University, Discussion leader: Jamie Paik, EPFL
Title: Title: Optoelectronic Sensing of the Deformation of Soft Robots, and their Electrohydraulic Power
Time: 7 am California, 10 am Boston, 3 pm London, 10 pm Beijing on 16 September 2020
In this paper we formulate the problem of elastodynamic transformation cloaking for Kirchhoff-Love plates and elastic plates with both in-plane and out-of-plane displacements. A cloaking transformation maps the boundary-value problem of an isotropic and homogeneous elastic plate (virtual problem) to that of an anisotropic and inhomogeneous elastic plate with a hole surrounded by a cloak that is to be designed (physical problem). For Kirchhoff-Love plates, the governing equation of the virtual plate is transformed to that of the physical plate up to an unknown scalar field.
Dear iMechanicians,
I hope some of you find of interest our latest Acta Mat. paper. We show that the concept of "beneficial traps" can enlarge by an order of magnitude the range of "safe loading frequencies" at which hydrogen embrittlement is not observed.
Analysis of the influence of microstructural traps on hydrogen assisted fatigue
Rebeca Fernández-Sousa, Covadonga Betegón, Emilio Martínez-Pañeda
Acta Materialia 199, 253-265 (2020). Link
