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Emilio Martínez Pañeda's picture

A phase field model for elastic-gradient-plastic solids undergoing hydrogen embrittlement

Dear iMechanicians,

I hope some of you find our recent JMPS paper interesting. We combine phase field fracture, hydrogen transport and strain gradient plasticity to provide a modern rationale to the mechanism of hydrogen enhanced decohesion. 

A phase field model for elastic-gradient-plastic solids undergoing hydrogen embrittlement

Philip K. Kristensen, Christian F. Niordson, Emilio Martínez-Pañeda

Journal of the Mechanics and Physics of Solids, 143, 104093 (2020)

Advances in Applied Mechanics Ranked First in Computational Mechanics

https://twitter.com/stephanebordas/status/1294185067095433216

Please contact me and Daniel Balint, should you be interested in contributing an authoritative review or white paper.

Best!

Stéphane Bordas

Teng Li's picture

EML Webinar by Prof. Markus Buehler on 19 August 2020: The Mechanics of Biomateriomics

EML Webinar on 19 August 2020 will be given by Professor Markus Buehler, MIT via Zoom meeting. Discussion leader: Professor Grace Gu, UC Berkeley

Title: The mechanics of biomateriomics

Time: 7 am California, 10 am Boston, 3 pm London, 10 pm Beijing on 19 August 2020

Modelling and evaluating multiple constituent alloys in LAMMPS

Choose a channel featured in the header of iMechanica: 

I have the following questions.

  1. How to model alloy in LAMMPS? How to automatically randomize the position of atoms of various types?
  2. Also how to evaluate the mechanical properties such as Elastic modulus and Fracture toughness?
  3. Is it possible to model interface fracture using LAMMPS?
emuna's picture

Inflation induced twist in geometrically incompatible isotropic tubes

We propose a new layered configuration of isotropic tubes that twists upon inflation, based on the concept of geometric incompatibilities. For more details click "Read more" below. The full paper can be found at: https://doi.org/10.1115/1.4047980.

 

Lixiang Yang's picture

Revisit initiation of localized plastic deformation: Shear band & necking

Hello Dear All,

    Thanks to Extreme Mechanics Letter, a new discusion of localized plastic deformation was published there. Three outlines of our work are:

      1. A new dislocation based consitutive model is built. It has a concise mathematical struture.

      2. Heat generated by plastic energy can be calculated by a mechanical version of Joule's law.

      3. Shear band and neck locations can be predicted by the mathematical model.

Phanish Suryanarayana's picture

Bending moduli for forty-four select atomic monolayers from first principles

We calculate bending moduli along the principal directions for forty-four select atomic monolayers using ab initio density functional theory (DFT). Specifically, considering representative materials from each of Groups IV, III–V, V monolayers, Group IV monochalcogenides, transition metal trichalcogenides, transition metal dichalcogenides and Group III monochalcogenides, we utilize the recently developed Cyclic DFT method to calculate the bending moduli in the practically relevant but previously intractable low-curvature limit.

Teng Li's picture

EML Webinar by Prof. Ellen Kuhl on 12 August 2020: Data-driven modeling of COVID-19—Lessons learned

EML Webinar on 12 August 2020 will be given by Professor Ellen Kuhl, Standard University via Zoom meeting. Discussion leader: Professor Pradeep Sharma, University of Houston.

Title: Data-driven modeling of COVID-19—Lessons learned

oliver oreilly's picture

Ever wonder what the modes of vibration of a rod contacting a surface look like?

Dear Colleague,

Our latest work on the dynamics of rods contacting rigid surfaces has just appeared:

N. N. Goldberg and O. M. O'Reilly, On contact point motion in the vibration of elastic rods, Journal of Sound and Vibration, 2020. 

Zhaohe Dai's picture

Mechanics at the interfaces of 2D materials

Dear iMechanica researchers,

I'd like to share an opinion paper that was written by Rui Huang, Kenneth Liechti, Nanshu Lu, and I for Current Opinion in Solid State & Materials Science. The aim is to discuss the mechanics research on 2D material interfaces in terms of recent developments and appeared challenges and opportunitiesHere is the link; Below, I also attached a copy of the manuscript and pasted the Abstract.

Antonio Papangelo's picture

Electroadhesive sphere-flat contact problem

The electroadhesive contact between a conductive sphere with a rigid substrate, both coated with an electrically insulating layer is studied, by adopting two solution strategies: (i) a DMT approximation and (ii) an iterative finite element model which accounts for the effect of the electroadhesive tractions on the deformation of the elastic solids. The contact problem is solved by varying the applied voltage and the elastic modulus of the coating layer.

Fan Xu's picture

A finite strain model predicts oblique wrinkles in stretched anisotropic films

Transverse wrinkles commonly occur in a uniaxially tensile elastic membrane and can vanish upon excess stretching. The wrinkling direction is usually perpendicular to the stretching direction under isotropic elasticity. Here, we show that wrinkles are orientable by material anisotropy, such as in fiber-reinforced or fibrous films, and the wrinkling orientation can be tuned by varying the stiffness and direction of fibers.

Ramathasan Thevamaran's picture

A Postdoctoral Research Associate Position at the University of Wisconsin-Madison

A Postdoctoral Research Associate Position is available (Fall 2020) in Professor R. Thevamaran’s laboratory at the Department of Engineering Physics of the University of Wisconsin-Madison to study the dynamic behavior of hierarchical materials.

Teng Li's picture

EML Webinar by Prof. Taher Saif on 5 August 2020: Living robotics

EML Webinar on 5 August 2020 will be given by Professor Taher Saif, the University of Illinois at Urbana-Champaign via Zoom meeting. Discussion leader: Professor Yuhang Hu, Georgia Tech.

Title: Living Robotics

Matt Pharr's picture

Journal Club for August 2020: Mechanics of High-capacity Rechargeable Batteries

Mechanics of High-capacity Rechargeable Batteries

Cole Fincher, Yuwei Zhang, Matt Pharr

Department of Mechanical Engineering, Texas A&M University

 

1. Introduction

Massimiliano Gei's picture

Phononic canonical quasicrystalline waveguides

I am glad to present a recent set of papers highlighting the noteworthy properties of 1D periodic waveguides generated by a quasicrystalline sequence. The concept of canonical configuration explains how to obtain a periodic frequency spectrum and why this outcome is connected to trace mapping:  

-->M. Gei, Z. Chen, F. Bosi, L. Morini (2020) Appl. Phys. Lett. 116, 241903 - https://doi.org/10.1063/5.0013528

Asking for a paper

Hello all,

I am looking for the following paper: Nash, C. D. "Fatigue of self-healing structure-a generalized theory of fatigue failure." MECHANICAL ENGINEERING. Vol. 89. No. 2. 345 E 47TH ST, NEW YORK, NY 10017: ASME-AMER SOC MECHANICAL ENG, 1967.

Unfortunately, I couldn't find it anywhere. Even I ordered it through RACER but they sent the abstract to me. I would really appreciate it if someone can provide me with this paper.

regards,
Faezeh

D.Rittel's picture

A study of hypervelocity glancing collisions

Most of the research carried out on hypervelocity  collisions, of the kind encountered in space, assume that the projectile hits a stationary target. In reality, both the target and the projectile are moving at high velocity in a non-colinear fasion. We present here a study of this  phenomenon and its rfelationship  with oblique impact.  

Antonio Papangelo's picture

On the Degree of Irreversibility of Friction in Sheared Soft Adhesive Contacts

A number of authors have experimentally assessed the influence of friction on adhesive contacts, and generally the contact area has been found to decrease due to tangential shear stresses at the interface. The decrease is however generally much smaller than that predicted already by the Savkoor and Briggs 1977 classical theory using “brittle” fracture mechanics mixed mode model extending the JKR (Griffith like) solution to the contact problem.

Teng Li's picture

EML Webinar by Prof. Teng Li on July 29, 2020: Advanced Materials toward a Sustainable Future: Mechanics Design

EML Webinar on July 29, 2020 will be given by Professor Teng Li, the University of Maryland via Zoom meeting. Discussion leader: Professor Zheng Jia, Zhejiang University.

Antonio Papangelo's picture

Does the loading apparatus stiffness affect the equilibrium of soft adhesive contacts under shear?

The interaction between contact area and frictional forces in adhesive soft contacts is receiving much attention in the scientific community due to its implications in many areas of engineering such as surface haptics and bioin-spired adhesives. In this work, we consider a soft adhesive sphere that is pressed against a rigid substrate and is sheared by a tangential force where the loads are transferred to the sphere through a normal and a tangential spring, representing the loading apparatus stiffness.

mpeleehp's picture

Ventilated acoustic metamaterial window panels for simultaneous noise shielding and air circulation

The conflict between the acoustical performance and ventilation efficiency in conventional noise barriers limits their application potentials in several settings. To address this challenge, we design and experimentally demonstrate a ventilated tunable acoustic metamaterial for noise mitigation at targeted frequencies. Through the structure, a peak normal incidence sound absorption coefficient of more than 0.96 at 1000 Hz and the peak normal incidence sound transmission loss of 18 dB is achieved while maintaining the air circulation with a 45% open area of ventilation.

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