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giulia scalet's picture

PhD position in eco-innovative shape memory architected dampers for the seismic protection of infrastructures

We are looking for a highly motivated candidate for a PhD position between École des Ponts ParisTech and University of Pavia, starting October 2024The position is part of the EU-funded project MISCEA, an ambitious multidisciplinary Doctoral Training Network under the Horizon-Europe Marie Skłodowska-Curie Actions COFUND.

Amit Acharya's picture

Inviscid Burgers as a degenerate elliptic problem

Uditnarayan Kouskiya                    Amit Acharya

We demonstrate the feasibility of a scheme to obtain approximate weak solutions to (inviscid) Burgers equation in conservation and Hamilton-Jacobi form, treated as degenerate elliptic problems. We show different variants recover non-unique weak solutions as appropriate, and also specific constructive approaches to recover the corresponding entropy solutions.

Constitutive theory for highly entangled hydrogels by considering the molecular friction

By considering the frictional sliding of randomly distributed entanglements within the polymer network upon mechanical stretches, we develop a constitutive theory to describe the large stretch behaviors of highly entangled hydrogels. 

doi: https://doi.org/10.1007/s10483-024-3076-8

 

mohsenzaeem's picture

Atomistic simulation assisted error-inclusive Bayesian machine learning for probabilistically unraveling the mechanical properties of solidified metals

Solidification phenomenon has been an integral part of the manufacturing processes of metals, where the quantification ofstochastic variations and manufacturing uncertainties is critically important. Accurate molecular dynamics (MD) simulations ofmetal solidification and the resulting properties require excessive computational expenses for probabilistic stochastic analyseswhere thousands of random realizations are necessary.

mrbuche's picture

Two recent papers using the same asymptotic approach

Please consider reading our two recent papers: (1) "Modeling single-molecule stretching experiments using statistical thermodynamics" in Physical Review E, and (2) "Statistical mechanical model for crack growth" also in Physical Review E.

Wenbin Yu's picture

A brief review of modeling of composite structures

This paper provides a brief review on modeling of composite structures. Composite structures in this paper refer to any structure featuring anisotropy and heterogeneity, including but not limited to their traditional meaning of composite laminates made of unidirectional fiber-reinforced composites. Common methods used in modeling of composite structures, including the axiomatic method, the formal asymptotic method, and the variational asymptotic method, are illustrated in deriving the classical lamination theory for the composite laminated plates to see their commonalities and differences.

Research Technician or Postdoctoral Research Associate on animal (chinchilla) studies

 

Organization: Biomedical Engineering Laboratory / School of AME / University of Oklahoma

Location: Norman, Oklahoma, United States

Date Needed: Available immediately

Primary Category: Research staff member for animal (chinchilla) studies

Type of Position: Full-Time

Salary:  To be comparable and determined

giulia scalet's picture

Call for abstract submission to mini-symposium MS036 on Smart Soft Materials @ECCOMAS 2024

Dear Colleague,

we invite you and your interested colleagues and students to submit a contribution to the mini-symposium MS036:

Smart Soft Materials: Additive Manufacturing, Modeling, Design, and Experimentation

within the 9th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMA2024), that will take place in Lisbon, Portugal, on June 3-7, 2024.

The deadline for presenting an abstract has been extended to January, 29th 2024.

Zheng Jia's picture

EML Webinar Young Researchers Forum by Xueju Wang, on 16 January 2024: Morphing Materials and Multifunctional Structures/Electronics for Intelligent Systems

EML Webinar (Young Researchers Forum) on 16 January 2024 will be given by Xueju Wang at University of Connecticut via Zoom meeting

Title: Morphing Materials and Multifunctional Structures/Electronics for Intelligent Systems

Amit Acharya's picture

A Hidden Convexity of Nonlinear Elasticity

Siddharth Singh          Janusz Ginster        Amit Acharya

A technique for developing convex dual variational principles for the governing PDE of nonlinear elastostatics and elastodynamics is presented. This allows the definition of notions of a variational dual solution and a dual solution corresponding to the PDEs of nonlinear elasticity, even when the latter arise as formal Euler-Lagrange equations corresponding to non-quasiconvex elastic energy functionals whose energy minimizers do not exist. This is demonstrated rigorously in the case of elastostatics for the Saint-Venant Kirchhoff material (in all dimensions), where the existence of variational dual solutions is also proven. The existence of a variational dual solution for the incompressible neo-Hookean material in 2-d is also shown. Stressed and unstressed elastostatic and elastodynamic solutions in 1 space dimension corresponding to a non-convex, double-well energy are computed using the dual methodology. In particular, we show the stability of a dual elastodynamic equilibrium solution for which there are regions of non-vanishing length with negative elastic stiffness, i.e. non-hyperbolic regions, for which the corresponding, primal problem is ill-posed and demonstrates an explosive ‘Hadamard instability;’ this appears to have implications for the modeling of physically observed softening behavior in macroscopic mechanical response.  

RAM3 Workshop in Rome

We are pleased to announce the fourth edition of the RAM3 workshop - Recent Advances in the Mechanics and Mathematics of Materials, which will take place in Rome on the 21st and 22nd of February 2024 at the Faculty of Civil and Industrial Engineering of Sapienza University.

matthew.grasinger's picture

Thermal fluctuations (eventually) unfold nanoscale origami

We investigate the mechanics and stability of a nanoscale origami crease via a combination of equilibrium and nonequilibrium statistical mechanics. We identify an entropic torque on nanoscale origami creases, and find stability properties have a nontrivial dependence on bending stiffness, radii of curvature of its creases, ambient temperature, its thickness, and its interfacial energy.

giulia scalet's picture

International Summer School "Mechanics of active soft materials: experiments, theory, numerics, and applications"

Glad to share that the University of Pavia, together with Politecnico di Milano, Technion - Israel Institute of Technology and University of Bologna, organizes the International Summer School “Mechanics of active soft materials: experiments, theory, numerics, and applications” within the Lake Como School of Advanced Studies, from 1st to 5th July 2024 at Villa del Grumello (Como, Italy). https://star.lakecomoschool.org/

Caglar Oskay's picture

Nominations Open for ASME Awards

I would like to bring your attention to four ASME awards and we welcome your nominations. The deadline is fairly soon on February 1!  

Society awards given by ASME Materials Division:

matthew.grasinger's picture

Summer research opportunities in machine learning and computational mechanics at AFRL

The DoD HPC Modernization Program has high-performance computing internship opportunities at the Air Force Research Laboratory. These internships give undergraduate and graduate students the opportunity to perform scientific, computational research alongside AFRL researchers in support of the US Air Force’s mission.

Rui Huang's picture

Postdoc position at UT Austin

Dr. Jan Fuhg has just joined UT Austin as an assistant professor. He has a postdoc position in computational solid mechanics and physics-informed machine learning. Please see attached file for details and contact Dr. Fuhg (jan.fuhg@utexas.edu) if you are interested.

Lorenzo Bardella's picture

On laminated structures under flexure

If you design laminated structures, such as sandwich panels, you might be interested in knowing that the through-the-thickness normal stress, properly disregarded in homogeneous structures, may play a fundamental role in triggering delamination.

Lorenzo Bardella's picture

Abstract call for Thematic Session 'SM12 - Plasticity, viscoplasticity and creep' - ICTAM2024 (Daegu, South Korea, Aug 25-30, 2024)

Dear Colleagues, 

within the 26th International Congress of Theoretical and Applied Mechanics (ICTAM2024) to be held in Daegu, South Korea, 25-30 Aug 2024, Henrik M. Jensen (Aarhus University, Denmark) and myself are organising the Thematic Session 'SM12 - Plasticity, viscoplasticity and creep'. 

We would like to invite you to contribute to this Thematic Session. 

The Extended Abstract Submission is open until January 15, 2024.

Best regards,

xiangzhang's picture

Multiscale computational mechanics Postdoc position at the University of Wyoming

The Computations for Advanced Materials and Manufacturing Laboratory (CAMML) in the College of Engineering and Physical Science at the University of Wyoming has an immediate opening for a Postdoctoral Researcher, in the area of multiscale reduced order modeling and design of heterogeneous materials under volumetric and interfacial damage. The project will build on our existing work in Refs. [1-3], and further advance it for modeling of lithium-ion battery system.

ESIS's picture

Discussion of fracture paper #39 - Dynamic Fracture on a Molecular Level

Dynamic fracture is a never-ending story. In 1951, EH Yoffe obtained an analytical solution for a crack of constant length travelling at constant speed along a plane. She used a Galilean transformation to get a solution for arbitrary speeds. The situation seems strange with a crack tip where the material breaks and a lagging tip where the material heals. However, there are applications. One that I encountered was several mode II cracks that travel in the contact plane between a brake pad and a brake disc. The moving cracks were blamed for the causing squeaking noise when braking.

Hanxun Jin's picture

Journal Club for January 2024: Machine Learning in Experimental Solid Mechanics: Recent Advances, Challenges, and Opportunities

Hanxun Jin (a,b), Horacio D. Espinosa (b)
a Division of Engineering and Applied Science, California Institute of Technology
b Department of Mechanical Engineering, Northwestern University

In recent years, Machine Learning (ML) has become increasingly prominent in Solid Mechanics. Its diverse applications include extracting unknown material parameters, developing surrogate models for constitutive modeling, advancing multiscale modeling, and designing architected materials. In this Journal Club, we will focus our discussion on the recent advances and challenges of ML when experimental data is involved. With broad community interest, as reflected by the increasing number of publications in this field, we have recently published a review article in Applied Mechanics Reviews titled “Recent Advances and Applications of Machine Learning in Experimental Solid Mechanics: A Review”. Moreover, a recent insightful paper from Prof. Sam Daly’s group also discussed some perspectives in this field. In this Journal Club, we would like to introduce and share insights into this exciting field.

Amit Acharya's picture

Ideal Magnetohydrodynamics and Field Dislocation Mechanics

The fully nonlinear (geometric and material) system of Field Dislocation Mechanics is reviewed to establish an exact analogy with the equations of ideal magnetohydrodynamics (ideal MHD) under suitable physically simplifying circumstances. Weak solutions with various conservation properties have been established for ideal MHD recently by Faraco, Lindberg, and Szekelyhidi using the techniques of compensated compactness of Tartar and Murat and convex integration; by the established analogy, these results would seem to be transferable to the idealization of Field Dislocation Mechanics considered. A dual variational principle is designed and discussed for this system of PDE, with the technique transferable to the study of MHD as well.

arash_yavari's picture

Geometric Phases of Nonlinear Elastic N-Rotors via Cartan's Moving Frames

We study the geometric phases of nonlinear elastic $N$-rotors with continuous rotational symmetry. In the Hamiltonian framework, the geometric structure of the phase space is a principal fiber bundle, i.e., a base, or shape manifold~$\mathcal{B}$, and fibers $\mathcal{F}$ along the symmetry direction attached to it. The symplectic structure of the Hamiltonian dynamics determines the connection and curvature forms of the shape manifold. Using Cartan's structural equations with zero torsion we find an intrinsic (pseudo) Riemannian metric for the shape manifold.

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