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Fan Xu's picture

Thermal wrinkling of liquid crystal polymer shell/core spheres

Smart soft materials that can flexibly respond to external multi-physics stimuli, have shown intriguing applications in shape-morphing and morphology control. Here, we present tunable wrinkling patterns in core-shell spheres under thermal load via controlling the orientation of director in nematic liquid crystal polymer (LCP). To analyze nonlinear instability and morphological evolution of LCP shell/core spheres, we develop a shallow core-shell model that accounts for director-induced anisotropic spontaneous strains.

Amit Acharya's picture

Rotations with constant Curl are constant

Janusz Ginster        Amit Acharya

We address a problem that extends a fundamental classical result of
continuum mechanics from the time of its inception, as well as answers a fundamental
question in the recent, modern nonlinear elastic theory of dislocations.
Interestingly, the implication of our result in the latter case is qualitatively different
from its well-established analog in the linear elastic theory of dislocations.

Preprint

USACM Virtual Seminar by Pania Newell, University of Utah

The USACM is happy to announce a virtual seminar this week on Wednesday, July 1st at 3pm Eastern.  The title of the seminar is "Examining Fracture Behavior in Heterogeneous Poro-Elastic Media from Nano to Macro-Scale".  An abstract of the talk is available here:

https://unsacm.memberclicks.net/assets/docs/Newell_2020.07.01_2pm.pdf

We have a number of seats available to anyone interested.  We just ask attendees to register at this page:

linst06's picture

Journal Club for July 2020: Fatigue-resistant hydrogels: Principles, Experiments, and Applications

  

 

Fatigue-resistant hydrogels: Principles, Experiments, and Applications

Shaoting Lin, Xuanhe Zhao

1.     Introduction

Ruobing Bai's picture

Elasticity notes of Eli Sternberg

Here are the elasticity notes of Eli Sternberg over many years as he taught AM 135 at Caltech. I had access to them when I was working with Prof. Kaushik Bhattacharya at Caltech during postdoc. Prof. Bhattacharya suggested making the notes publicly available via iMechanica, and below is a short note from him.

 

Mayank Patni's picture

Variable kinematics continuum finite element

Willing to share the work done in my Ph.D. thesis ("An efficient numerical framework for capturing localised 3D stress fields in laminated composites). The basic code (written in FORTRAN 90) is available on GITHUB (Check the following link). 

Mechanical Engineering HQ's picture

World’s First Spherical Artificial Eye Has 3D Retina

Hello iMechanica! My name is Ryan and I am the Founder of Mechanical Engineering HQ. I am writing here today to share an interesting development in prosthesis. Scientists have claimed that they have developed a new artificial eye that has more advanced capabilities than human eyes. Read on to see if they have achieved this feat!

Qizhi He's picture

Post-doctoral Fellow in multiscale topology optimization and additive manufacturing of lattice structures at at HKU

Applications are invited for appointment as Post-doctoral Fellow in multiscale topology optimization and additive manufacturing of lattice structures in the Department of Orthopaedics and Traumatology (Ref.: 500412), to commence as soon as possible for one to three year(s), with the possibility of renewal subject to satisfactory performance. A highly competitive salary (above HK$30,000 per month, low tax rate) commensurate with qualifications and experience will be offered, in addition to annual leave and medical benefits.  

Teng Li's picture

EML Webinar by Prof. Chiara Daraio on July 1, 2020: The Mechanics of Robotic Matter

EML Webinar on July 1, 2020 will be given by Prof. Chiara Daraio at Caltech via Zoom meeting. Discussion leader: Teng Li, University of Maryland.

Sabyasachi Chatterjee's picture

How useful are formal hierarchies? A case study on averaging dislocation dynamics to define meso-macro plasticity

A formal hierarchy of exact evolution equations are derived for physically relevant space-time averages of state functions of microscopic dislocation dynamics. While such hierarchies are undoubtedly of some value, a primary goal here is to expose the intractable complexity of such systems of nonlinear partial differential equations that, furthermore, remain ‘non-closed,’ and therefore subject to phenomenological assumptions to be useful. It is instead suggested that such hierarchies be terminated at the earliest stage possible and effort be expended to derive closure relations for the ‘non-closed’ terms that arise from the formal averaging by taking into account the full-stress-coupled microscopic dislocation dynamics (as done in [CPZ+ 20]), a matter on which these formal hierarchies, whether of kinetic theory type or as pursued here, are silent.

danialfaghihi's picture

Immediate PhD Position in Computational Engineering at the University at Buffalo for Fall/Spring 2020

An immediate Ph.D. position is available in the Predictive Computational Engineering (PCE) Lab in the Department of Mechanical and Aerospace Engineering. The research project aims at developing novel computational methods for predictive modeling and uncertainty quantification of biomimetic-inspired materials systems. Candidate should already be in the U.S. and must have a Master's degree in engineering or applied math. A strong background in computational and applied mechanics is desired.

Postdoctoral positions in computational atomistic modeling

Two postdoctoral positions are available in the laboratory of physical metallurgy in CEA Saclay (France) for two years starting this Fall 2020 to work either on the thermodynamic modeling of Ti-Zr-O alloys using ab initio calculations, or on the interaction between dislocations and precipitates in Zr-Nb alloys using molecular dynamics.

1) Modeling of Ti-Zr-O thermodynamics from ab initio calculations

Antonio Papangelo's picture

Interfacial Dissipative Phenomena in Tribomechanical Systems

Dear Colleagues,

In the last twenty years, tribology and nonlinear dynamics have included several major contributions related to key topics such as rough contact, friction, damping mechanisms, and dynamical behaviour of nonlinear systems, which are paving the way for future engineering challenges. The two fields are largely intertwined as, among the others, contact nonlinearities are almost omnipresent in any technical application ranging from the development of NEMS/MEMS to bioengineering, automotive, civil/mechanical industry, and aerospace.

USACM Virtual Seminar by John Evans, UC Boulder

The USACM is happy to announce a virtual seminar this week on Thursday, June 25th at 3pm Eastern.  The title of the seminar is "Data-Driven Turbulence Modeling and Simulation: From RANS to LES".  An abstract of the talk is available here:

https://unsacm.memberclicks.net/assets/docs/Evans_2020.06.25_2pm.pdf

We have a number of seats available to anyone interested.  We just ask attendees to register at this page:

Jihong Ma's picture

Postdoc position in nanomaterial simulation

A postdoc position is available in the area of computational polymeric nanomaterials in Dr. Jihong Ma's group (https://sites.google.com/umn.edu/jihong-ma-group/homeat the University of Vermont starting September or October 2020. This project will involve close collaboration with Oak Ridge National Laboratory (ORNL).

Teng Li's picture

EML Webinar by Prof. Michael Dickey on June 24, 2020: Liquid metals at the extreme

EML Webinar on June 24, 2020 will be given by Prof. Michael Dickey, NC State University. Discussion leader: Hanqing Jiang, Arizona State University.

oreste.bursi's picture

PhD Position - Innovative metamaterials for vibration mitigation. Analysis and risk assessment of petrochemical tank farms. Dynamic analysis based on Gaussian process regression - Deadline for application: 23/07/2020

We are looking for strongly motivated PhD candidates that are interested to work on the following topic at the University of Trento (Italy): 

Innovative metamaterials for vibration mitigation. Analysis and risk assessment of petrochemical tank farms.  Dynamic analysis based on Gaussian process regression (see attachment for more information)

Interested candidates can apply at the following link

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

Freeze casting of novel materials

Freeze casting presents exciting new avenues towards high performance materials with aligned pore structures.

Bone scaffolds, highly elastic composites and nacre mimetic materials can all be produced by means of freeze casting methods. 

This comprehensive review presents recent development in terms of materials and processing

 

 

Looking for Head -Marketing and Communication for MNC in Pune

Today, I received this email from some one at Neptune consultants in Pune [^], through Naukri.com [^].

PhD vacancy (3 years) on mechanical testing of recyclable vitrimer composites

Vitrimers are a groundbreaking development in polymer chemistry. This new class of polymers is neither thermoset, nor thermoplastic, but inherits properties from both polymer classes. Vitrimers were "invented" by Prof. Leibler in Paris in 2011 (https://en.wikipedia.org/wiki/Vitrimers).

PhD/postdoc vacancy (4 years) on Ultrasonic assessment of the structural health of Lined Pipelines transporting heavy acids

Transportation of heavy acidic fluids is often done with specifically designed lined pipelines. The pipelines typically have an outer steel wall (thickness ~15 mm) and an inner ceramic coating (thickness ~1 mm). The proper functioning of such lined pipelines is almost exclusively determined by the inner ceramic coating. In case there would be a leak in the ceramic coating, the acidic fluid will corrode through the outer steel wall in a matter of hours, leading to a full shutdown of the industrial plant.

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