blogs

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.

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.

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

Dear Colleagues, Within the 26th International Congress of Theoretical and Applied Mechanics (ICTAM 2024) to be held in Daegu, South Korea, 25 – 30 Aug 2024,Vikram Pakrashi (University College Dublin - Ireland) and myself (Francesco Dal Corso, University of Trento - Italy) are organising the Thematic Session 'FS08 - Education in mechanics'. 

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.

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

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.  

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.

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.

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/

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:

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.

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.

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.

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,

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.

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 (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.