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Journal Club for January 2021: 3D Printing of Soft Materials

3D Printing of Soft Materials

Qi (Kevin) Ge

Department of Mechanical and Energy Engineering

Sourthern University of Science and Technology, Shenzhen, China

 

1. Introduction

lijianyu's picture

Journal Club for June 2020: Mechanically instructive biomaterials: a synergy of mechanics, materials and biology

 

Mechanically instructive biomaterials: a synergy of mechanics, materials and biology

Zhenwei Ma, Jianyu Li

Department of Mechanical Engineering, McGill University, Montreal, Canada

 

Teng Li's picture

EML Webinar

  • Mark your calendar: every Wednesday at 9:30 am Boston, 2:30 pm London, 3:30 Paris, 10:30 pm Beijing.
  • Join live webinars in two ways: Zoom (for attending the lecture and participating in the discussion) or YouTube Live Stream.
  • Watch videos of past EML Webinars on YouTube or Weibo.
Antonio Papangelo's picture

Experimental observations of nonlinear vibration localization in a cyclic chain of weakly coupled nonlinear oscillators

Experimental results on nonlinear vibration localization in a cyclic chain of weakly coupled oscillators with clearance nonlinearity are reported. Numerical modelling and analysis complements the experimental study. A reduced order model is derived and numerical analysis based on the harmonic balance method demonstrates the existence of multiple classes of stable spatially localized nonlinear vibration states. The experiments agree very well with the numerical results.

Payam Soltani's picture

Dynamic Modelling of a Hydraulic Engine Mount Including the Effects of Elastomer Aging

In this article, the effect of material aging of an elastomeric main spring (MS) inside a hydraulic engine mount (HEM) on its dynamic performance is investigated. A set of HEMs aged under realistic operational conditions are used to create an empirical material aging model of the elastomer at two different temperatures (35°C and 95°C) using dynamic mechanical thermal analysis (DMTA).

Cemal Basaran's picture

A unified mechanics theory-based model for temperature and strain rate dependent proportionality limit stress of mild steel

Strain rate and temperature dependent elastic limit of mild steel is investigated by developing a dislocation incipient motion-based proportionality limit stress model. Temperature effect on strain energy of an edge dislocation is modeled by using unified mechanics theory. Unified mechanics theory-based index, called thermodynamic state index, is used to model thermally assisted degradation of strain energy. Kinetic energy due to thermal vibrations is added to the kinetic energy of an accelerating dislocation.

Antonio Papangelo's picture

Vibration localization due to flutter instability in a bladed rotor

The current push toward lightweight structures in aerospace and aeronautical engineering is leading to slender design airfoils, which are more likely to undergo large deformation, hence experiencing geometrical nonlinearities. The problem of vibration localization in a rotor constituted by N coupled airfoils with plunge and pitch degrees of freedom subjected to flutter instability is considered.

Antonio Papangelo's picture

Does roughness enhance or destroy adhesion????

Recently, Dalvi and co-authors have shown detailed experimental data of adhesion of soft spheres with rough substrates with roughness measured down to almost the atomic scale, finding that the Persson and Tosatti theory gave satisfactory predictions of the apparent work of adhesion during loading, once the increase of the surface area due to roughness is correctly computed at extremely small scales.

Timoshenko beam free vibration analysis

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K Jimmy Hsia's picture

EML New Year Message

Dear Friends of EML,

Happy New Year! 

2020 was an extremely challenging year for all because of COVID 19. For most of us, the lockdowns and work from home negatively impacted our research activities; for some, it provided a time to reflect on the value of our work; and, for a few, it presented an unusual opportunity to explore new directions of research.

USACM 2021 Call for Award Nominations

Nominations for the 2021 USACM Honors and Awards are now being accepted.  For information on guidelines and submitting nominations, go to this web page:

http://forms.usacm.org/2021_HA_Call

The deadline for submission is January 31, 2021.  As a past President of the USACM, I'd like to encourage members of the iMechanica community to consider suitable awardees and nominate individuals as appropriate.  

giorgio_carta's picture

Special Issue "Advances in Elastic Micro-Structured Systems and Metamaterials" - deadline approaching

Dear colleagues,

 

happy New Year!

The submission deadline for the special issue "Advances in Elastic Micro-Structured Systems and Metamaterials" is approaching.

mokarram76's picture

Numerics of growth-induced deformations

Dear iMechanicians,

Growth-induced deformation or morphoelasticity  is an interesting phenomenon ranging from living tissues to biological plants in nature. We recently publish a paper in JMPS that solves some challenging boundary value problems by addressing few key issues in computational morphoelasticity. It might be interesting for you.  

Fan Xu's picture

Special Issue on Instability and Bifurcation in Materials and Structures comes out

Dear Colleagues,

After one-year effort, we are happy to announce that the SI on Instability and Bifurcation in Materials and Structures is now completed and comes out online (https://www.sciencedirect.com/journal/international-journal-of-non-linear-mechanics/special-issue/1089TRQ46GQ).

mohsenzaeem's picture

Quantitative Phase-Field Modeling of Solute Trapping in Rapid Solidification

A quantitative phase-field model is developed for prediction of solute trapping for solidification velocities relevant to additive manufacturing. S. Kavousi and M. Asle Zaeem, Quantitative phase-field modeling of solute trapping in rapid solidification.  Acta Materialia 205 (2021) 116562 (11 pages). 

Emilio Martínez Pañeda's picture

Phase field predictions of microscopic fracture and R-curve behaviour of fibre-reinforced composites

Dear iMechanicians,

I hope that the following work is of interest to you. We combine the phase field method with cohesive zone modelling to predict the fracture behaviour of fibre-reinforced composites across scales.

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Compressive performance and crack propagation in Al alloy/Ti2AlC composites

The morphology of MAX phase composites is examined here. Specifically, crack branching is examined in Al - Ti2AlC composites showing the role of MAX phase distribution on the fracture performance of such materials. Ductile alloy phases serve to deflect cracks in the hard, yet tough, MAX phase.

Full text available here

Teng Li's picture

EML Webinar by Prof. David Weitz on Dec. 16, 2020: Snap, Speckle and Spot: Sight and Sound of Hydraulic Fracture

EML Webinar on 16 December 2020 will be given by Dave Weitz, Harvard University. Discussion Leader Jia Liu, Harvard University.

Title: Snap, Speckle and Spot: Sight and Sound of Hydraulic Fracture

M. Shaat's picture

Metamaterials with Giant and Tailorable Nonreciprocal Elastic Moduli

Natural nonlinear materials, e.g., biological materials and polymers, are mechanically weak. It has been amajor challenge to develop a nonlinear material with potentialmechanical applications. Here, we develop a nonlinear elastic metamaterial with giant and tailorable-nonreciprocal elastic moduli. The metamaterial is designed with a microstructural axial asymmetry, which activated nonlinear microstructural deformations in the axial direction and microstructural residual moments.

M. Shaat's picture

Review on nonlocal continuum mechanics: Physics, material applicability, and mathematics

The classical continuum mechanics assumes that a material is a composition of an infinite number of particles each of which is a point that can only move and interact with its nearest neighbors. This classical mechanics has limited applications where it fails to describe the discrete structure of the material or to reveal many of the microscopic phenomena, e.g., micro-deformation and micro-dislocation.

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