research

Journal Club for October 2023: Dynamic Behavior of Ceramics, Ceramic Composites, and Structures: Experimental and Computational Mechanics to Inform Advanced Manufacturing

Authors (alphabetical by last name): James D. Hogan*, Haoyang Li, Saman Sayahlatifi, Sara Sheikhi, Zahra Zaiemyekeh, and Jie Zheng

dear collegues

   I have been attracted recently by a theory from Shrimali and Lopez-Pamies which is based on experimental evidence obtained from Suo's group in Harvard in 2012 in a (limited, but significant) set of experiments on rubber.   The theory assumes that the stretch to nucleating a crack is constant and independent on stretch rate.  The theory is then built on that, to predict the increase of fracture energy with rate.

Dear Colleagues,

I would like to share our recent paper "Delayed detached eddy simulation-based aerothermoelastic analysis of deployable control fin in supersonic and hypersonic flows" published in Physics of Fluids. In this paper we study the stability and mechanics of a deployable control fin in supersonic and hypersonic flows accounting for fluid-structure interactions and joint freeplay nonlinearity. 

We investigate the fluid-elastic instability of a square tube bundle subject to two-phase cross-flow. A dimensional analysis is carried out, leading to a new criterion of instability. This criterion establishes a direct link with the instability thresholds in single-phase flows. In parallel to the dimensional analysis, experimental work is carried out to i) determine the instability thresholds in single-phase flows (new relation between the Scruton, Stokes and Reynolds number), ii) to test the validity of the two-phase flow instability criterion, derived from the dimensional analysis.

Our upcoming webinar is on September 27 at 2pm central.

Date/Time: September 27; 2-3pm CDT

Join via Zoom: https://us06web.zoom.us/j/84541274013?pwd=ZDhuM09BaUlVVlBuREhEV0sweGFlZz09

(Meeting ID: 845 4127 4013/Passcode: 799065)

Speaker: Kaushik Bhattacharya, California Institute of Technology

Discussant: Miguel Bessa, Brown University

Call for nominations for John J. Montgomery Award for Distinguished Innovation in Aerospace. This New Award Commemorates John Montgomery, Inventor of the human-piloted glider, a father of aviation. Deadline to submit is October 1, 2023. Details can be found at
John J. Montgomery Award for Distinguished Innovation in Aerospace - ASME.

We are seeking a highly motivated and enthusiastic candidate with background in continuum/experimental mechanics eager to be part of an exciting new research project: High strain rate behavior of thermoplastic composite materials for cryogenic hydrogen storage (H-FROST).

 Summary:

Our new paper is online in Journal of Applied Mechanics. We exolore the thermomechancial coupling in polydomain liquid crystal elastomers. https://asmedigitalcollection.asme.org/appliedmechanics/article/doi/10.1....

A complimentary PDF is available: https://www.novatechsetproofs.com/authors/ASME/JAM-23-1288.pdf .

During next week, on September 14-15, we hold a pyLife workshop at the FME Czech Technical University in Prague, Czechia. pyLife is a Python-based open-source library built previously mostly by colleagues from Bosch to deal with the fatigue life estimation (see https://github.com/boschresearch/pylife).

EML will re-launch the EML Webinar Series (Young Researchers Forum) on 12 September 2023.  The webinars are planned to be held once a month for a total of 10 to 12 webinars per year. 

EML Webinar (Young Researchers Forum) on 12 September 2023 will be given by Ruobing Bai at Northeastern University via Zoom meeting

New themed collection in Materials Advances on “Multimodal Remote Actuation and Sensing in Polymers for Advanced Applications” now open for submissions

https://blogs.rsc.org/jm/2023/07/26/themed-collection-multimodal-remote-...

https://www.sciencedirect.com/science/article/abs/pii/B978032390646300006X

With funding from the Haythornthwaite Foundation, the Executive Committee (EC) of the Applied Mechanics Division (AMD) of ASME is pleased to announce the establishment of the Haythornthwaite Research Initiation Grant Program, targeting university faculty engaged in research in theoretical and applied mechanics that are at the beginning of their academic careers. Applicants must hold a tenure‐track appointment at the rank of Assistant Professor at a US university on October 1, 2023, and must not be more than 5 years beyond receipt of their doctoral degree at the time

In the past 3 years, Brown Engineering faculty led by Professor Yuri Bazilevs with co-directors Professors Kenny Breuer and Pradeep Guduru have won more than $15 million in awards for research in Mechanics of Undersea Science and Engineering (MUSE). This was made possible by partnering with Naval researchers and the Naval Undersea Warfare Center (NUWC) in Newport, R.I.

This center may bring great opportunities for doing doctoral and postdoctoral research at Brown. I look forward to interacting with new colleagues and following the progress of MUSE.

In this paper we formulate a geometric nonlinear theory of the mechanics of accreting-ablating bodies. This is a generalization of the theory of accretion mechanics of Sozio and Yavari (2019). More specifically, we are interested in large deformation analysis of bodies that undergo a continuous and simultaneous accretion and ablation on their boundaries while under external loads.

PhD positions are available for DurAMat which is a Marie Skłodowska-Curie Actions - Doctoral Network (MSCA-DN) project.  A total number of 11 PhD students will be hired for DurAMat. One PhD student will join us at the department of Physics of the University of Gothenburg in Sweden. The project details and the application process are described in the project website: http://duramat-project.eu/

Yida Zhang

Assistant Professor

Department of Civil, Environmental and Architectural Engineering, University of Colorado Boulder, Boulder, CO, 80303

Research lab: https://www.yidazhanggroup.com/

1. Introduction

Diverse science and engineering problems are governed by delay differential equations (DDE). Seeking periodic solutions of DDEs is crucial for many nonlinear dynamic systems. The incremental harmonic balance (IHB) method is an efficient semi-analytical ap- proach for periodic solutions of DDE.

The Design & Uncertainty Quantification group at The University of Iowa, led by Professor Sharif Rahman, is looking for two new Ph.D. students, who are capable of and interested in performing high-quality research on solid mechanics, uncertainty quantification, and design optimization. The research, supported by U.S. National Science Foundation, requires building a solid mathematical foundation, devising efficient numerical algorithms, and developing practical computational tools, all associated with stochastic analysis and design of complex materials and structures.

The thermal-hydraulics as well as flow-induced vibration of wire-wrapped rod bundles calls for accurate and efficient liquid metal flow simulation and prediction, yet it remains a challenge due to the complex geometries and high Reynolds number flow in wire-wrapped rod channel. Previous efforts towards this goal exclusively adopts full-order modeling (FOM), which is prohibitively computation-intensive.

We present a general formalism for the analysis of mechanical lattices with microstructure using the concept of effective dynamic mass. We first revisit a classical case of microstructure being modeled by a  spring-interconnected mass-in-mass cell. The frequency-dependent effective dynamic mass of the cell is the sum of a static mass and of an added mass, in analogy to that of a swimmer in a fluid. The effective dynamic mass is derived using three different methods: momentum equivalence, dynamic condensation, and action equivalence.

MedTrain+ is the successor Industry-Academia Training, Career Development and Mobility Fellowship Programme at CÚRAM, SFI Research Centre for Medical Devices to MedTrain (GA 713690). As part of this, MedTrain+ is offering prestigious three-year fellowships to eligible experienced researchers in the broad area of Medical Device Research and Development. The MedTrain+ programme will provide excellent experienced researchers with a research, complementary, and transferable skills training experience of the highest international standards.