research

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

Extreme Mechanics Letters is pleased to announce the Recipients of the 2023 EML Young Investigator Award

Dear Colleagues,

Please see our recent article on toughening 3D printable resins with block copolymer additives:

Abstract

Extreme Mechanics Letters (EML) Special Issue: Call for Paper 

Machine Learning and Mechanics

Chloé Arson, Ph.D.

Professor, Cornell University School of Civil and Environmental Engineering

 Introduction

Amit Acharya

A methodology for defining variational principles for a class of PDE models from continuum mechanics is demonstrated, and some of its features explored. The scheme is applied to quasi-static and dynamic models of rate-independent and rate-dependent, single crystal plasticity at finite deformation.

This article will appear in Soft Matter (https://doi.org/10.1039/D3SM00664F)

A Dimensionally-Reduced Nonlinear Elasticity Model for Liquid Crystal Elastomer Strips with Transverse Curvature

Kevin LoGrande (1, 2), M. Ravi Shankar (3) and Kaushik Dayal (1, 4, 5)

1Department of Civil and Environmental Engineering, Carnegie Mellon University

2Computation and Information Sciences Directorate, CCDC Army Research Lab

3Department of Industrial Engineering, University of Pittsburgh

On Tuesday 24th October at 3:00 pm (Italian time) Samuel Forest will offer the seminar “Strain gradient plasticity based on saturating internal variables” at the Department of Civil, Environmental, Architectural Engineering and Mathematics of the University of Brescia (Italy). Here attached please find the abstract of the seminar. 

Anyone may directly join online through Google Meet at 

https://meet.google.com/rad-ehjg-ker

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

Title: Structural self-sensing based on measuring the resistance, capacitance or inductance of the structural material, without sensor incorporation

Speaker:  Dr. D. D. L. Chung, University at Buffalo

Time: 10/26, 11AM-12PM EST.

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

The problem of the detachment of a sufficiently large flat indenter from a plane adhesive viscoelastic strip of thickness “b” is studied. For any given retraction speed, three different detachment regimes are found: (i) for very small “b” the detachment stress is constant and equal to the theoretical strength of the interface, (ii) for intermediate values of “b” the detachment stress decays approximately as b−1/2, (iii) for thick layers a constant detachment stress is obtained corresponding to case the punch is detaching from a halfplane.

This study presents a computational approach to obtain nonlinearly elastic constitutive relations of strip/ribbon-like structures modeled as a special Cosserat rod. Starting with the description of strips as a general Cosserat plate, the strip is first subjected to a strain field which is uniform along its length. The Helical Cauchy-Born rule is used to impose this uniform strain field which deforms the strip into a six-parameter family of helical configurations-the six parameters here correspond to the six strain measures of rod theory.

Dear Colleagues of the composite community,

Our first Special Issue are already published on Applied Composite Materials as Volume 30, issue 4:

Applied Composite Materials | Volume 30, issue 4 (springer.com)

Full article list are provided here:

EML Webinar (Young Researchers Forum) on 17 October 2023 will be given by Emma Lejeune at Boston University via Zoom meeting

Title: Data Driven Modeling of Mechanical Systems

Discussion leader: Adrian Buganza Tepole, Purdue University

In this paper we revisit the mathematical foundations of nonlinear viscoelasticity. We study the underlying geometry of viscoelastic deformations, and in particular, the intermediate configuration. Starting from the multiplicative decomposition of deformation gradient into elastic and viscous parts F=FeFv, we point out that Fv can be either a material tensor (Fe is a two-point tensor) or a two-point tensor (Fe is a spatial tensor).

Sharing for the benefit of those who are interested: A new technical paper co-authored by researchers at the JAXA: Japan Aerospace Exploration Agency, The University of Tokyo and CYBERNET SYSTEMS CO.,LTD., was published in the Aerospace - a free-access journal by MDPI. The authors reckon that the study will provide a guideline for effective designs of high-performance lattice structures with architected materials.

"S15: Advanced modelling techniques: Higher-order continua" organised by Samuel Forest (Mines ParisTech CNRS) and Lorenzo Bardella (University of Brescia) http://emmc19.org/symposium-s15.html  

Abstract submission deadline: December 22nd, 2023, http://emmc19.org/submissions.html

In this paper, we present a large-deformation formulation of the mechanics of remodeling. Remodeling is anelasticity with an internal constraint---material evolutions that are mass and volume-preserving.  In this special class of material evolutions, the explicit time dependence of the energy function is via one or more remodeling tensors that can be considered as internal variables of the theory. The governing equations of remodeling solids are derived using a two-potential approach and the Lagrange-d'Alembert principle.

Journal Club for October 2023: Dynamic Behavior of Ceramics, Ceramic Composites, and Structures: Experimental and Computational Mechanics to Inform Advanced Manufacturing

Authors (alphabetical by last name): James D. Hogan*, Haoyang Li, Saman Sayahlatifi, Sara Sheikhi, Zahra Zaiemyekeh, and Jie Zheng

dear collegues

   I have been attracted recently by a theory from Shrimali and Lopez-Pamies which is based on experimental evidence obtained from Suo's group in Harvard in 2012 in a (limited, but significant) set of experiments on rubber.   The theory assumes that the stretch to nucleating a crack is constant and independent on stretch rate.  The theory is then built on that, to predict the increase of fracture energy with rate.

Dear Colleagues,

I would like to share our recent paper "Delayed detached eddy simulation-based aerothermoelastic analysis of deployable control fin in supersonic and hypersonic flows" published in Physics of Fluids. In this paper we study the stability and mechanics of a deployable control fin in supersonic and hypersonic flows accounting for fluid-structure interactions and joint freeplay nonlinearity.