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Derivatives of Tensors

Hi all,

I am looking for a general definition of the derivative of a tenorial product (e.g. when the expression for Stress contains nonlinear terms in deformation gradient, F ).

I start with a very simple example:

∂F_pq/∂F_mn = δ_pm  δ_qn , i.e. Kronecker delta with first index of F_pq and first index of  F_mn, and second Kronecker delta for second pair of indices q & n.

rajan_prithivi's picture

Overview of solid mechanics

 

This video (LINK)  attempts to give the big picture of solid mechanics along with the brief explanation of the constituent topics.

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This is an educational outreach initiative targeted at all engineers interested in mechanics and seek simpler explanations. Kindly share if you learn something out of this !

 

Thanks,

Prithivi

Mahmood Jabareen's picture

Postdoctoral position at the Technion - Israel Institute of Technology: A multiphysics modeling of electroactive polymers

Due to their large deformation capability, electroactive polymers are promising materials for several engineering applications. They can be used, for example, as actuators and sensors in artificial muscles, biomedical devices, microrobots, pumps, valves, etc. The research in this emerging field focuses in the multiphysics modeling of electroactive polymers and combines many aspects of structural mechanics, composite materials (for modeling composite electroactive polymers), and failure mechanisms of structural components and materials.

marco.paggi's picture

CISM course ''Modelling and Simulation of Tribological Problems in Technology''

Advanced Course at the International Centre for Mechanical Sciences (CISM, Udine, Italy)

 

Modelling and Simulation of Tribological Problems in Technology

May 28, 2018 — June 1, 2018 

Coordinators:

Marco Paggi (IMT School for Advanced Studies Lucca, Lucca, Italy)

David A. Hills (University of Oxford, Oxford, Great Britain)

Shuze Zhu's picture

Metallic and highly conducting two-dimensional atomic arrays of sulfur enabled by molybdenum disulfide nanotemplate

https://www.nature.com/articles/s41524-017-0041-z

Element sulfur in nature is an insulating solid. While it has been tested that one-dimensional sulfur chain is metallic and conducting, the investigation on two-dimensional sulfur remains elusive. We report that molybdenum disulfide layers are able to serve as the nanotemplate to facilitate the formation of two-dimensional sulfur.

 

Xuanhe Zhao's picture

Faculty positions at MIT Department of Mechanical Engineering

The Massachusetts Institute of Technology (MIT) Department of Mechanical Engineering seeks candidates for faculty positions starting July 2018 or on a mutually agreed date thereafter. Appointments will be at the assistant or untenured associate professor level. In special cases, a senior faculty appointment will be considered. Our department is committed to fostering interdisciplinary research that can address grand challenges facing our society.

Postdoctoral Opportunities at US Naval Research Laboratory

We are looking for Postdoctoral Fellows with computational mechanics background specializing in one or more of these areas: solid mechanics, wave-structure interaction, fatigue and corrosion induced structural damage.

Please check the attached flyer for details or visit http://nrc58.nas.edu/RAPLab10/Opportunity/Opportunity.aspx?LabCode=64&RO...

 

Thanks, Saikat Dey

zichen's picture

Postdoctoral Research Associate at Dartmouth

One postdoctoral fellow position in solid mechanics/biomechanics at Dartmouth is immediately available in the Chen group at Thayer School of Engineering at Dartmouth (http://engineering.dartmouth.edu/people/faculty/zi-chen/). The subjects of research include, but arre not limited to, cancer cell migration, mechanics of morphogenesis in embryos or plants, and/or bioinspired robots.

Time Integration scheme for non constant M, C and K matrices?

Can anyone suggest a time integration scheme for non constant mass (M), stiffness(K) and damping (C) matrices? I am trying to solve a dynamic system (Ma+Cv+Ku=R) where the matrices M,C and K are time dependent.

 

Any thoughts/ideas will be highly aprreciated. Thank you. 

Three Research Studentships in Impact Mechanics (Computational Modelling, Experimentation and Engineering)

Summary

This studentship is being jointly offered by the University of Oxford and Rolls Royce plc under the EPSRC Industrial CASE award scheme.

The research will be focused on the development of novel numerical modelling methodologies for simulation of the response of titanium alloys to impact loading, as a part of a long term collaboration with designers of large gas turbine engines for civil aviation.

Ying Li's picture

Faculty Positions in Mechanical Engineering at University of Connecticut

The Department of Mechanical Engineering at the University of Connecticut is growing the faculty to develop existing strengths of the department and expand in exciting new directions. This year, the department invites applications for multiple tenure-track or tenured faculty positions focused on developing innovative material systems, mathematical and computer modeling, as well as analysis and fabrication approaches in support of advanced and digital manufacturing, and with a strong emphasis on scientific rigor.

Meredith N. Silberstein's picture

SEM 2018 Mechanics of Time Dependent Materials June 4-7

The Time-Dependent Materials Technical Division of the Society for Experimental Mechanics invites you to submit an abstract to Track 2,“Challenges in Mechanics of Time-Dependent Materials” at the SEM International Congress & Exposition on Experimental and Applied Mechanics (Greenville, SC, June 4-7, 2018).

Stephan Rudykh's picture

[Extended Deadline: Oct. 22] 16th European Mechanics of Materials Conference (EMMC-16) Nantes, France, March 26-28, 2018

Dear Colleagues, 16th European Mechanics of Materials Conference (EMMC-16) will be held in Nantes, France,  March 26th-28th, 2018. As part of this meeting, we are organizing a session (S9) to bring together experts in modelling, simulation, manufacturing and experimental investigation in the field of Functional and architectured materials to present and discuss recent advances.

Harley T. Johnson's picture

Faculty Positions in Mechanical Science and Engineering at UIUC

The Department of Mechanical Science and Engineering at the University of Illinois at Urbana-Champaign invites applications for multiple faculty positions at all ranks. Candidates are sought in all technical sub-disciplines of mechanical science and engineering, including design, thermosciences, solid and fluid mechanics, and dynamics and control, with particular interest in the broad application areas of manufacturing, energy and sustainability, and robotics and cyber-physical systems.

Stress distribution is not accurate of ballastless track in ABAQUS

Dear riends.

   I have been trying to do is that developing a model of railway track using Abaqus software in order to check the dynamic responses of subgrade layer. For that, I have created all layers of the complete track using different specific materials and TIE constrains for each layer. In addition, I have created in the interaction between wheel and rail with firctional interaction. I have tried two steps, step 1 is static general and step 2 dynamic implicit and I am using time amplitude.

Time integration scheme for XFEM? (dynamic crack propagation)

Hello everyone,

 

Can somebody suggest an implicit/explicit time integration scheme when the matrices involved(M,C,K) are time dependent? (They change at every time step because of the crack tip enrichment functions which are time dependent).

 

I used the implicit Newmark scheme (trapezoidal/constant average acceleartion method) but just discovered that all my matrices (M,C,K) are time dependent where the original scheme is probably for constant M,C and K matrices. I used the scheme as in reference [1]. 

 

rezaavaz's picture

Call For Abstracts: USNC/TAM 2018 Symposium "Growth and Remodeling of Living Matter"

Dear Colleagues:

We would like to invite you to submit an abstract to Symposium: Growth and Remodeling of Living Matter, as part of the 18th U.S. National Congress for Theoretical and Applied Mechanics  (USNCTAM 2018). The conference will be hosted by Northwestern University, at the Hyatt Regency O'Hare from June 5 to June 9, 2018.  

Assistant, Associate, or Full Professor

The Department of Materials Science and Engineering at Texas A&M University invites applications for a tenured or tenure-track faculty position in the area of mechanical behavior of advanced structural materials.  Although candidates at the assistant professor level are preferred, exceptionally well qualified candidates will be considered for appointment at the rank of associate or full professor.

Assistant, Associate, or Full Professor

The Department of Materials Science and Engineering at Texas A&M University invites applications for a tenured or tenure-track faculty position in the area of mechanical behavior of advanced structural materials.  Although candidates at the assistant professor level are preferred, exceptionally well qualified candidates will be considered for appointment at the rank of associate or full professor.

Pradeep Sharma's picture

(Reminder: Due 31st October) Call for Nominations for the Eshelby Mechanics Award for Young Faculty

It is my pleasure to solicit nominations for the "Eshelby Mechanics Award for Young Faculty". This award, launched in 2012, is given annually to rapidly emerging junior faculty who exemplify the creative use and development of mechanics. The intent of the award is to promote the field of mechanics, especially among young researchers. While interdisciplinary work that bridges mechanics with physics, chemistry, biology and other disciplines is encouraged, the ideal awardee will demonstrate clear inspiration from mechanics in his/her research.

Shuman_Xia's picture

Call for Abstracts: Symposium on “Mechanics of Energy and Energetic Materials” at SEM 2018 (Greenville, SC, June 4-7, 2018)

Dear Colleagues,

We would like to cordially invite you to submit an abstract to the 2018 Society for Experimental Mechanics (SEM) International Congress session on "Mechanics of Energy and Energetic Materials". The conference will be held in Greenville, SC from June 4-7, 2018. Abstracts are due October 26, 2017 via the SEM.org website.

Mechanics of Energy and Energetic Materials

Experimentally validated multi-scale modelling scheme of deformation and fracture of cement paste

Our group has recently published a new paper on simulations and modelling of mechanical properties of cement paste in Cement and Concrete Research, the leading journal in the field. 

Abstract:

Estimation of three dimensional stresses based on ESL theory

In this research work, a new higher order shear theory has been developed and a new method is used to estimate interlaminar stresses using constitutive law.

Vadim Silberschmidt's picture

Reader, Senior Lecturer and Lecturer at Loughborough University, UK

The above positions are available at the Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, UK.

Please consider the adverts and apply using the following web pages:

-          For Reader: https://vacancies.lboro.ac.uk/tlive_webrecruitment/wrd/run/ETREC107GF.op...

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