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oliver oreilly's picture

A Geometric Perspective on Gimbal Lock in the Apollo program

The phenomenon of gimbal lock rose in prominence during the time  of NASA's Apollo program. Inside the inertial measurement unit of the Apollo spacecraft was a stable (inertial) platform about which the spacecraft rotated. The hinged platform was suspended in two gimbals to give it three degrees of freedom. Its role was to give an accurate measure of the spacecraft's orientation. At a particular orientation of the spacecraft, the gimbals became coplanar and control torques became ineffective at stabilizing the platform.

Lihua Jin's picture

Microstructural origin of resistance–strain hysteresis in carbon nanotube thin film conductors

Microstructural origin of resistance–strain hysteresis in carbon nanotube thin film conductors

Lihua Jin, Alex Chortos, Feifei Lian, Eric Pop, Christian Linder, Zhenan Bao and Wei Cai

Proceedings of the National Academy of Sciences of the United States of America

 

karelmatous's picture

Solving Nonlinear PDEs with a priori accuracy using wavelets

We present a numerical method which exploits the biorthogonal interpolating wavelet family, and second-generation wavelets, to solve initial–boundary value problems on finite domains. Our predictor-corrector algorithm constructs a dynamically adaptive computational grid with significant data compression, and provides explicit error control. Error estimates are provided for the wavelet representation of functions, their derivatives, and the nonlinear product of functions.

Mike Ciavarella's picture

2 dead, gunman at large in Central Michigan University shooting

Here.  The question of safety especially in US campuses, is serious.

Very terrible news.

PhD Opening in Computational Mechanics

Two PhD positions (research assistants) are available in the Department of Mechanical Engineering within the Purdue School of Engineering and Technology at Indiana University–Purdue University Indianapolis (IUPUI). The full-support position is available for Fall 2018. The projects are focused on conducting computational modeling and simulations of various materials, including atomistic and multiscale simulations.

3D CT to Simulation-Ready Models Workshop, Mar 22nd, UK

From 3D Computed Tomography Images (NSI) to Simulation-Ready Models (Simpleware)

Date/Time: Thursday, March 22, 2018 / 1:30 pm - 5:00 pm

Location: North Star Imaging UK, High Wycombe, UK

Fee: Free-to-attend. Pre-registration is required as places are limited

Who should attend

Postdoc position in cardiovascular modeling and simulation at NTNU, Trondheim, Norway

One postdoc position within the field of biomechanical modeling/biomedical engineering for the cardiovascular system is available at Department of Structural Engineering at NTNU, Trondheim, Norway.  The position will be organized under the cardiovascular modeling project headed by professor Leif Rune Hellevik in the Biomechanics group.

K Jimmy Hsia's picture

EML Vol 19 is out

EML Vol 19 is out, with 7 papers. It is quite fascinating just to read the titles! There are papers on mech behaviors due to interactions within complex structures such as nanofibers in vesicles (cover), novel structures with hierarchically synchronized deformations, and mechanochemically augmented composites. There are studies of cool materials from twinning phosphorene to single layer borophene. And there are papers on methods (full-volume displacement mapping with dualMRI) and device (triboelectric generator). Can’t wait to read the content!

 

4th International Conference on BioTribology (ICoBT2018): Invited speakers announced

We are pleased to announce the invited speakers for the 4th International Conference on BioTribology (ICoBT 2018), which will take place 26-29 September 2018 in Montreal, Canada.

 

The aim of the ICoBT meetings is to bring together researchers from across the scientific, clinical and engineering spectrum, to promote communication across the different disciplines and to provide a platform for the presentation of new work in one meeting focused solely on Biotribology.

Seminar: BioEM Simulations for Medical Diagnosis and Treatment, March 21st

National Physical Laboratory, Teddington, UK

The interaction between electromagnetic fields (EM) and the human body are being exploited in clinical and biomedical applications. Electromagnetic medical devices are used for diagnosis as well therapy. This NAFEMS seminar brings together EM software communities to discuss the topic of bio electromagnetics; current trends in EM simulation, exposure to EM fields, and applications of EM field for both therapy and detection.

Simpleware at BioEM - attend the Simpleware Presentation

Numerical modelling as a tool for designing self-healing concrete

Dear all,

Our group at TU Delft has recently published two articles dealing with use of numerical fracture models for design of capsule carriers for their use in self healing concrete.

For design of tubular capsules: https://www.researchgate.net/publication/311861983_Simulation-Aided_Desi...

Group Leader Position in Computational Materials Science

The Institute for General Material Properties of the Friedrich-Alexander Universität Erlangen-Nürnberg (FAU) is inviting applications for a group leader in the area of Computational Materials Science. The Materials Modeling Group conducts research into the elementary defects of the crystalline lattice and on how their organization and interaction influence the mechanical properties and failure of metallic materials.

Vladislav Yastrebov's picture

Permanent research position in Computational Mechanics of Materials and Structures in MINES ParisTech

We have a permanent position (equiv. Associate/Full Professor) opening in the field of Computational Mechanics of Materials and Structures.

Location: Centre des Materiaux, MINES ParisTech, Paris/Evry, France. All details are in the attached file.

Lucia Nicola's picture

Three PhD positions and two postdoc positions in computational mechanics of materials

Applications are invited for three PhD and two postdoc positions in the area of computational mechanics of materials at the University of Padova, Italy.

The successful candidates will work at building a multiscale model for the study of contact, friction and solid lubrication between metal surfaces, sponsored by an ERC consolidator grant.

rajan_prithivi's picture

Isotropic & Kinematic hardening

This video gives a basic overview of the most fundamental hardening models of plasticity, which are the isotropic and kinematic hardening

 

Hope this helps!

- Prithivi

xwgu's picture

Journal Club for March 2018: Colloidal Self-Assembly of Architected Nanomaterials

Structural hierarchy through self-assembly

Architected materials with nano and microscale features can have extraordinarily high strength, stiffness, and toughness per weight. Two well-known biological materials with these characteristics are nacre (mother of pearl)1 and the claw of the mantis shrimp.2 These materials are made of up periodic arrangements of hard domains interspersed with soft matter (Fig. 1). Structural hierarchy exists at different length scales, and varies spatially across the material.

Local stresses in composite structure made of woven fabric

MSG helps to obtain the more accurate local fields in any type of microstructure and as effective as 3D RVE analysis and yet more efficient!

Please check these links to see the power of MSG.   

 

http://scholarlypages.org/Articles/aerospace-engineering-and-mechanics/j...

Haijun Liu's picture

PhD position in Mechanics/Acoustics at Temple University

There is one open Ph.D. student position with financial support in the Department of Mechanical Engineering at Temple University to start in Fall, 2018 . The successful applicant will work with Dr. Haijun Liu on interdisciplinary research topics that involve mechanics, biology, acoustics, and sensor technology. To comply with the admission guidelines at the College of Engineering at Temple University, the applicants need to meet the following requirements:

Qihan Liu's picture

Bonding dissimilar polymer networks in various manufacturing processes

Dear Friends,

Please find our paper on Nature Communications about a novel method to bond hydrogel and elastomers. Comparing to existing methods, our method features the applicability to various manufacturing processes, including dip-coating and 3D printing.

Link to the paper

https://www.nature.com/articles/s41467-018-03269-x

Abstract

Jobs (x2): Post-doc+Programmer - Rhino Plugin implementation for Isogeometric BEM or/and Isogeometric FEM

We are looking for a C++ or CSharp Programmer and a post-doctoral fellow to couple our in-house Isogeometric BEM/FEM and Collocation approach to Rhino3D. Funding is available for 12 months of post-doc as well as programming time for a GUI and interfacing with Rhino3D. Freelance programmers are welcome to apply. Knowledge of elasticity, linear algebra and BEM acceleration are a plus. 

Contact me for more information including your IGA experience, BEM/FEM experience and background in mechanics. 

Best wishes!

Stéphane

Global-local field analysis using MSG

MSG is a powerful tool to analyze the global-local field analysis in any type of composites irrespective of the shape of the constituents. You may check the link here under to see what is happening at microscale due to global loading.

 

https://www.youtube.com/watch?v=RxJrK3Z-feU

Mike Ciavarella's picture

National TV program on Politecnico di BARI and its successes

See a national broadcast on Politecnico di BARI and the region Puglia, with its successes, including the worldwide success of Diesel common rail technology, the GE centre on Addittive Manufacturing and Cold Spray, and others.

 

Jingjie Yeo's picture

Multiscale modeling of keratin, collagen, elastin and related human diseases: Perspectives from atomistic to coarse-grained molecular dynamics simulations

https://doi.org/10.1016/j.eml.2018.01.009 Scleroproteins are an important category of proteins within the human body that adopt filamentous, elongated conformations in contrast with typical globular proteins. These include keratin, collagen, and elastin, which often serve a common mechanical function in structural support of cells and tissues. Genetic mutations alter these proteins, disrupting their functions and causing diseases.

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