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.

A few days ago I had a good discussion with a dear colleague on the topic of the current state of scholarship in mechanics and the education of the new generation of mechanicians. During the past few decades most mechanics researchers have limited their activities to the writing of papers and research proposals. This because the “reward system” places little value to the authoring of monographs and textbooks. In fact the number of quality books produced during this period pales in comparison to those written by the giants of mechanics, including Timoshenko, Truesdall, etc.

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.

Immediate #postdoc position in experimental mechanics of #composites at UT-Austin Mechanical Engineering. The applicant must currently be in the U.S. due to the COVID-19 international travel restrictions. Send your CV to tehrani [at] utexas.edu

We have an open postdoctoral position at the University of California, Los Angeles.

Please follow this link for details: https://tinyurl.com/UCLA-Postdoc

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.

I have an opening for a new postdoctoral scholar to join my research group, please see attached. The project is on the field-scale calibration of DEM models. Primary responsibilities include developing and executing large-scale experiments, interpretation and synthesis of results, and collaboration with modelers to perform the calibrations.

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

This is to inform the readers on iMechanica about this Handbook.

Link to the Handbook