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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.

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

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/

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,

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.

Francesco Dal Corso's picture

Stabilization against gravity and self-tuning of an elastic variable-length rod through an oscillating sliding sleeve

Is it possible to prevent the fall of a rod inside a sliding sleeve due to gravity?

graphical abstract

By controlling the transverse oscillations of the constraint and revealing a novel self-tuning dynamic response, we provide a positive answer to this question in our paper:

Roberto Brighenti's picture

MSCA postdoctoral fellowship - support action of the University of Parma (ITALY) to prospective candidates

At the University of Parma (Italy) a call for supporting students wishing

to apply to the prestigious Marie Curie postdoctoral fellowship is now open.

 

Wenbin Yu's picture

SSDM 2024 (Seattle, April 29th-May 1st)

Dear Colleagues, after a great success of the inaugural ASME Aerospace Structures, Structural Dynamics, and Materials (SSDM) conference this past summer, I am writing to cordially invite you to attend its 2nd edition in Seattle, USA, April 29-May 1st, 2024. The main feature of the SSDM conference is:

Ramathasan Thevamaran's picture

Mitigating Oblique Impacts by Unraveling of Buckled Carbon Nanotubes in Helmet Liners

Abstract

 

Background: Helmet systems most commonly experience oblique blunt impacts which cause simultaneous linear and rotational accelerations. The ability to attenuate both linear and rotational accelerations by absorbing the normal shock while accommodating large shear deformations with energy dissipation is critical to developing superior helmet liners that prevent traumatic brain injury (TBI).

 

marco.paggi's picture

10-year impact report - MUSAM Research Unit

On November 2023 the research unit MUSAM -Multi-scale Analysis of Materials-  at the IMT School for Advanced Studies Lucca turns 10! 

To celebrate the contributions made to computational and experimental mechanics over the past 10 years, and to acknowledge the PhD students, researchers and visiting professors that have animated the research unit, I am pleased to share with you a 10-year impact report. 

I hope you might find it interesting and inspiring for future collaborations! 

Wenbin Yu's picture

Global Composites Experts Webinar by Dr. Gregory M. Odegard

cdmHUB invites you to attend the Global Composites Experts Webinar Series. 

Title: US-COMP: Next Generation of Composites Materials for Crewed Deep Space Missions

Speaker:  Dr.  Gregory M. Odegard, Michigan Technological University

Time: 12/14, 11AM-12PM EST.

Register in advance for this webinar: https://bit.ly/3uy3zpg.

jfmolinari's picture

Journal club for December 2023 : Recent trends in modeling of asperity-level wear

Ernest Rabinowicz’s words, spoken two decades ago in his groundbreaking textbook on the friction and wear of materials [1], continue to resonate today: ’Although wear is an important topic, it has never received the attention it deserves.’ Rabinowicz’s work laid the foundation for contemporary tribology research [2]. Wear, characterized as the removal and deformation of material on a surface due to the mechanical action of another surface, carries significant consequences for the economy, sustainability, and poses health hazards through the emission of small particles. According to some estimates [1, 3], the economic impact is substantial, accounting for approximately 5% of the Gross National Product (GNP).

Despite its paramount importance, scientists and engineers often shy away from wear analysis due to the intricate nature of the underlying processes. Wear is often perceived as a ”dirty” topic, and with good reason. It manifests in various forms, each with its own intricacies, arising from complex chemical and physical processes. These processes unfold at different stages, creating a time-dependent phenomenon influenced by key parameters such as sliding velocity, ambient or local temperature, mechanical loads, and chemical reactions in the presence of foreign atoms or humidity.

The review paper by Vakis et al. [5] provides a broad perspective on the complexity of tribology problems. This complexity has led to numerous isolated studies focusing on specific wear mechanisms or processes. The proliferation of empirical wear models in engineering has resulted in an abundance of model variables and fit coefficients [6], attempting to capture the intricacies of experimental data.

Tribology faces a fundamental challenge due to the multitude of interconnected scales. Surfaces exhibit roughness with asperities occurring at various wavelengths. Only a small fraction of these asperities come into contact, and an even smaller fraction produces wear debris. The reasons behind why, how, and when this occurs are not fully understood. The debris gradually alter the surface profile and interacts with one another, either being evacuated from the contact interface or gripping it, leading to severe wear. Due to this challenge of scales, contributions of numerical studies in wear research over the past decades sum up to less than 1% (see Fig. 1). Yet, exciting opportunities exist for modeling, which we attempt to discuss here.

While analyzing a single asperity contact may not unveil the entire story, it arguably represents the most fundamental level to comprehend wear processes. This blog entry seeks to encapsulate the authors’ perspective on this rapidly evolving topic. Acknowledging its inherent bias, the aim is to spark controversies and discussions that contribute to a vibrant blogosphere on the mechanics of the process.

The subsequent section delves into the authors’ endeavors in modeling adhesive wear at the asperity level. Section 3 navigates the transition to abrasive wear, while Section 4 explores opportunities for upscaling asperity-level mechanisms to the meso-scale, with the aspiration of constructing predictive models. Lastly, although the primary focus of this blog entry is on modeling efforts, it would be remiss not to mention a few recent advances on the experimental front.

Zheng Jia's picture

EML Webinar Young Researchers Forum by Diego Misseroni, on 28 November 2023: Reprogrammable Frustration, Multistability, and Tunable Auxeticity in Origami Metamaterials

EML Webinar (Young Researchers Forum) on 28 November 2023 will be given by Diego Misseroni at University of Trento via Zoom meeting

Title: Reprogrammable Frustration, Multistability, and Tunable Auxeticity in Origami Metamaterials

Discussion leader: Glaucio Paulino, Princeton University

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