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arash_yavari's picture

On the Direct and Reverse Multiplicative Decompositions of Deformation Gradient in Nonlinear Anisotropic Anelasticity

In this paper we discuss nonlinear anisotropic anelasticity formulated based on the two multiplicative decompositions F=FeFa and F=FaFe. Using the Bilby-Kroner-Lee decomposition F=FeFa one can define a Riemannian material manifold (the natural configuration of an anelastic body) whose metric explicitly depends on the anelastic deformation Fa.

Emilio Martínez Pañeda's picture

Griffith-based analysis of crack initiation location in a Brazilian test

Dear iMechanicians, I hope that the paper below is of interest, given the wide use this experiment. Essentially, we use the generalised Griffith criterion to determine the crack initiation location in the Brazilian split test, establishing the conditions (jaws geometry and material properties) that lead to a valid test. We find that the range of conditions where the Brazilian test is valid is much narrower than previously thought, with current standards being inappropriate for a wide range of rock-like materials.

Article: Modal added-mass matrix of an elongated flexible cylinder immersed in a narrow annular fluid, considering various boundary conditions. New theoretical results and numerical validation

This paper considers the fluid–structure interaction problem of two coaxial cylinders separated by a thin layer of fluid. The flexible inner cylinder is imposed a small amplitude harmonic displacement corresponding to a dry vibration mode of an Euler–Bernoulli beam, while the external cylinder is rigid. A new theoretical formulation based on the assumption of a narrow fluid annulus is derived to estimate the modal added-mass matrix of the vibrating cylinder.

Production of Fibres from Lunar Soil: Feasibility, Applicability and Future Perspectives

The construction of a lunar base is considered to be an important step towards deep-space exploration by humanity, and will rely on the utilisation of in situ lunar resources. In this paper, we discuss the current knowledge on the feasibility of converting lunar soil to high-performance fibres that can be used for the construction of a lunar base. This fibre would be combined with further portions of lunar soil to generate fibre-reinforced composites, which is utilized as multi-functional materials for lunar base construction.

Joshua's picture

Mechanical couplings of 2D lattices uncovered by decoupled micropolar elasticity tensor and symmetry operation

We introduce a generalized methodology to uncover all mechanical couplings in 2D lattice geometries by obtaining the decoupled micropolar elasticity tensor. We also correlate the mechanical couplings with the point groups of 2D lattices by applying the symmetry operation to the decoupled micropolar elasticity tensor. The decoupled micropolar constitutive equation reveals eight mechanical coupling effects in planar solids, four of which are discovered for the first time in the mechanics' community.

enrico.salvati1's picture

Defect-based Physics-Informed Machine Learning Framework for Fatigue Prediction

I would like to draw your attention to our recently proposed predictive method based on a semi-empirical model (LEFM) and Neural Network, exploiting the Physics-informed Machine Learning concept. We show how the accuracy of state-of-the-art fatigue predictive models, based on defects present in materials, can be significantly boosted by accounting for additional morphological features via Physics-Informed Machine Learning.

Zheng Jia's picture

Delayed tensile instabilities of hydrogels

Jie Ma, Daochen Yin, Zhi Sheng, Jian Cheng, Zheng Jia*, Teng Li, Shaoxing Qu, Delayed Tensile Instabilities of Hydrogels, Journal of the Mechanics and Physics of Solids, 168, 105052 (2022)

susanta's picture

Article: An Atomistic-based Finite Deformation Continuum Membrane Model for Monolayer Transition Metal Dichalcogenides

Highlights

• A finite-deformation crystal-elastic membrane model for TMD monolayers is presented.

• Strains of the middle surface and two normal-stretches describe the deformation.

• The continuum hyperelastic strain energy is obtained from an interatomic potential.

• The present model matches well with the purely atomistic simulations.

Abstract

M. Jahanshahi's picture

Temperature-dependent multiscale modeling of graphene sheet under finite deformation

The homogenized constitutive models that have been utilized to simulate the behavior of nanostructures are typically based on the Cauchy–Born hypothesis, which seeks the fundamental properties of material via relating atomistic information to an assumed homogeneous deformation field. It is well known that temperature has a profound effect on the validity and size-dependency of the Cauchy-Born hypothesis in finite deformations.

2022 IMECE student travel award competition

The Applied Mechanics Executive Committee (AMD-EC) is pleased to announce the 2022 IMECE student travel award competition, which is sponsored by the Haythornthwaite Foundation*.

Article: Hydrodynamic Interaction Between Two Flexible Finite Length Coaxial Cylinders: New Theoretical Formulation and Numerical Validation

This article addresses the interaction of two coaxial cylinders separated by a thin fluid layer. The cylinders are flexible, have a finite length, and are subject to a vibration mode of an Euler–Bernoulli beam. Assuming a narrow channel, an inviscid and linear theoretical approach is carried out, leading to a new simple and tractable analytical expression of the fluid forces.

Fan Xu's picture

A 3D hard-magnetic rod model based on co-rotational formulations

Hard-magnetic soft materials have attracted broad interests because of their flexible programmability, non-contact activation and rapid response in various applications such as soft robotics, biomedical devices and flexible electronics. Such multifunctional materials consist of a soft matrix embedded with hard-magnetic particles, and can exhibit large deformations under external magnetic stimuli. Here, we develop a three-dimensional (3D) rod model to predict spatial deformations (extension, bending and twist) of slender hard-magnetic elastica.

Francesco Dal Corso's picture

Double restabilization and design of force–displacement response of the extensible elastica with movable constraints

May a double restabilization of the trivial path occurr at monotonically increasing compression force?

May movable constraints be exploited to attain target force–displacement curves?

 https://ars.els-cdn.com/content/image/1-s2.0-S0997753822001887-ga1_lrg.jpg

xiangzhang's picture

Multiscale design of nonlinear materials using reduced-order modeling

Dear colleagues, 

We recently pablished a paper titled "Multiscale design of nonlinear materials using reduced-order modeling", which might be interesting to you. The paper is freely accessible by this link through 09/24/2022 on Elsiver, and an author's copy is here. The abstract is attached below. Thank you for your interest. 

oliver oreilly's picture

Configurational Forces in Plates and Shells

Dear Colleague, 

 

I'm pleased to announce our latest paper on configurational mechanics has just appeared in Acta Mechanica:

 

Nathaniel N. Goldberg and Oliver M. O’Reilly. A Material Momentum Balance Law for Shells and Plates with Application to Phase Transformations and Adhesion. Acta Mechanica, 2022.

 

Open Access is kindly provided by UC Berkeley Library.

 

Wenbin Yu's picture

iVABS

Dear All,

I am excited to share that we recently developed iVABS as an integrated VABS-based framework for design and optimization, parametric studies, uncertainty quantifications of composite rotor blades, and other beam-like structures. This tool is particularly useful for rapid design of composite slender structures with accuracy of detailed 3D FEA at the speed of simple engineering beam theories.  

tawfick's picture

Journal Club for August 2022: The route towards engineered multifunctional hair and fur

Sameh Tawfick, University of Illinois at Urbana-Champaign (tawfick@illinois.edu)

 

Birds have feathers, animals have fur, humans and plants have hair, and mimicking these multifunctional morphologies will undoubtedly improve future robots, buildings, and drones 

 

Introduction:

Kshiteej Deshmukh's picture

An energy conserving mechanism for temporal metasurfaces

Dear colleagues,

We are pleased to share with you and invite you to read our work on energy conserving space-time metamaterials/media which has been published in Applied Physics Letters (selected as Editor's pick). The link to the online version is pasted below: 

https://aip.scitation.org/doi/full/10.1063/5.0097591

 

Title: An energy conserving mechanism for temporal metasurfaces

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