Alexis Rusinek’s Post

In this work, we propose a patterning strategy where the careful design of spatially-varying interface properties enables the formation of an adhesive ligament that acts as a crack-arrest feature.   #Adhesivejoints #CFRP #Interface #Crackarrestfeature #Cohesivezonemodel   https://lnkd.in/eP76Vjia Mechanics of Composites for Energy and Mobility - KAUST KAUST PSE KAUST Research

In particular, please, submit your abstract to MS: Discrete Models for the Simulation of Infrastructure Materials (MS Code: 8vi5n, needed for abstract submission) that I co-organized with my friends and colleagues Gilles Pijaudier-Cabot, Jan Elias, Madura Pathirage, Mohammed Alnaggar, and Giovanni Di Luzio. "The internal heterogeneous structure of engineering materials plays a fundamental role in their behavior under loading and environmental exposure. Various materials show such heterogeneity at different length scales. Down to the metallic or mineral grain level and up to the composite particle and/or fiber composite level, the heterogeneity determines their mechanical behavior, structural performance and long-term durability. These properties are influenced by the coupling of chemical reactions, mass transport and heat transfer, as well as fracture at the material heterogeneity length scale(s). For the simulation of these fine scale mechanical features, the last several decades have seen the successful formulation and implementation of discrete models, e.g models that are not based on the classical assumptions of continuum mechanics. Discrete models enable the efficient representation of many multiscale and multiphysics phenomena. These computational technologies have been proven to supersede by far most of other available computational techniques for the simulation of porous heterogeneous quasi-brittle materials, especially for applications where the description of material internal structure and the link among different length scales is important. This mini symposium will provide a forum for international experts and researchers to discuss recent advances in discrete modeling. Topics of interest include but are not limited to fracture and creep; multiscale modeling; early-age behavior of cast and printed cementitious materials; coupled formulations for mass transport, cracking, shrinkage, creep, healing, and deterioration; hydraulic fracture; Performance under extreme exposure conditions. Computational approaches of interest include but are not limited to Lattice Discrete Particle Model (LDPM); Lattice beam models; Discrete Element Method (DEM); Molecular Dynamics (DM); Semi-Grand-Canonical Monte Carlo (SGCMC) methods."

Here, we demonstrate the capabilities of the recently proposed constitutive compatibility method(CCM) in 3D and in a domain decomposition framework. The CCM is well suited for use in cases where the material properties are assumed spatially non-uniform. https://lnkd.in/gp-U5pDi   #inverseproblem #identification #fullfieldmeasurement #constitutivecompatibilitymethod #domaindecomposition Mechanics of Composites for Energy and Mobility - KAUST KAUST PSE KAUST Research

Impinging jets are a simple and common way of atomizing a spray and are commonly used in combustion applications. The most famous case of the application of this technique was the use of an impinging jet injector in the Rocketdyne F-1 engine for the Saturn V moon rocket. The atomization process created by the impinging jets is complex and contains rich dynamics. Here, authors present a detailed look at the breakup with a new set of visualization tools for identifying and analyzing the important features of the phenomenon. These visualizations were made from images acquired at a speed of 20,000 frames per second at a shutter speed of 1/100000th of a second. These new tools grant the ability to analyze many of the important features in the liquid sheet, ligaments, and droplets that are formed during the atomization process. The addition of tracking also allows the monitoring of primary and secondary breakup events. This tool presents an exciting new avenue for the further study of impinging jets atomization to grant a greater understanding of the important mechanisms at play. Funding support from the DoD (Award number W911NF2110158) and the SDSU Master’s Research Scholarship are gratefully acknowledged. For more information regarding their research projects, please visit our lab website at http://liu.sdsu.edu/, or contact the PI at Xiaofeng.Liu@sdsu.edu. DOI: https://lnkd.in/e3bPgrVz Authors: Evan Pruitt, William Markiewicz, Carlos Gonzalez, Xiaofeng Liu from San Diego State University #aerodynamics #cfd #heattransfer #thermodynamics #physics #engineering #cae #simulation

In this study, we demonstrated a straightforward method to improve the structural integrity of the fused filament fabricated (FFF) continuous carbon fiber-reinforced (CCFR) composites using self-reinforcing nanofiber interleave. We hope for a path toward better 3D-printed parts in the future!    #3Dprintedcomposites #Nanofibers #Flexuralfatigue #Selfreinforcingeffect #Fusedfilamentfabrication https://lnkd.in/evfF6WE5 Mechanics of Composites for Energy and Mobility - KAUST KAUST PSE KAUST Research

The objective of this paper is to provide some experimental evidence on the coupling of diffuse damage and transverse cracking and to identify modifications in transverse cracking toughness when CFRPs exhibit various levels of diffuse damage. https://lnkd.in/ep_vSbrv   #Carbonfibers #Laminate #Interface #Damage #Transversecracking #Computedtomography Mechanics of Composites for Energy and Mobility - KAUST KAUST PSE KAUST Research

🚨 New Publication Alert 🚨 Just published in IOP Publishing's Journal of Physics D: Applied Physics: Electrohydrodynamic (#EHD) characteristics of a needle-to-ring positive #corona discharges through self-consistent #modeling including #turbulence effects. https://lnkd.in/djnkkv3S 🤔❓ Why should you care? The purely electrical mechanism of momentum addition to the background gas (i.e. the EHD effect) without any mechanical parts, can been leveraged in various applications ranging from #electrostatic precipitators, #heat dissipation/cooling of #electronic components, fanless blowers/pumps, #water harvesting, aerodynamic flow control to solid-state, in-atmosphere #propulsion. It's blowin' in the electric wind! ⚡⚡⚡ 🤓 🤩 What's new?  We formulate efficient #algorithms for self-consistent #multiphysics simulations of corona discharge in arbitrary configurations, eliminating the empirical assumptions and often severe limitations of simplified #plasma models. Through comparison with experiments, we try to validate our approach and show the influence of plasma and fluid related effects on the resulting #jet flows. Kudos to all co-authors for the excellent collaboration between our Plasma Science & Innovations (PlaSci) team at Centre for Research & Technology Hellas (CERTH) / CPERI, ONERA - The French Aerospace Lab and Université Paul Sabatier Toulouse III ( Institute of Mathematics of Toulouse - IMT). #research #science #physics #ionwind #simulations #numericalanalysis #collaboration #technology

𝐓𝐡𝐞 𝐡𝐢𝐠𝐡-𝐯𝐞𝐥𝐨𝐜𝐢𝐭𝐲 𝐢𝐦𝐩𝐚𝐜𝐭 𝐩𝐫𝐨𝐛𝐥𝐞𝐦 💥 A circular iron disc normally impacts an aluminium plate at a velocity of 1000 m/s. Both materials are surrounded by air. Due to large tensile deformations, cracks appear during the penetration of the disc resulting in a final fragmentation of the plate. 🔗 Here is the link to the corresponding scientific publication, «Multi-solid and multi-fluid diffuse interface model: Applications to dynamic fracture and fragmentation»: https://lnkd.in/espnJ23J This simulation was conducted by my colleague Serge Bertrand Ndanou, PhD. under the supervision of Nicolas Favrie. P.S. Science should be agnostic ! #cfd #engineering #physics #science #simulation #cae #scientificcomputing #computing #researchanddevelopment

The certification of large composite structures is based on a pragmatic approach, which is intended to be safe and essentially experimental but with a strong test/calculation dialogue called the “Test Pyramid”.   However, this has proved to be extremely expensive and it appears necessary to reduce its cost either by developing Virtual testing, or by developing richer tests on an intermediate scale between coupon specimens and structural parts.   It was in the aim of meeting this objective that the VERTEX program (French acronym for “Experimental modeling and Validation of compositE strucTures under complEX loading”) was launched in 2012. The 5-year VIRTUOSE program (https://lnkd.in/endtpCix) started in 2019 made it possible to develop further the Tests/Measurement/Numerical Simulation tryptic.   In this paper, we summarize more than 12 years of research ! This is a joint effort with my colleagues from Institut Clément Ader (ICA) CNRS UMR 5312 Bruno CASTANIÉ christophe bouvet Jean-Charles Passieux Jean-Noel Périé and John-Eric Dufour.   The article is in Open Access mode : https://lnkd.in/efB7U5zr   #correlation #image #testing #compositematerials #structural

❗ New publication alert ❗ Our latest publication explores the plasma properties in the plume of a low-power cylindrical Hall thruster. We present the comprehensive characterization of the far-plume using electrostatic diagnostics. The research delves into the impact of various operating conditions on plasma generation and acceleration. It sheds light on how input parameters such as anode voltage, propellant mass flow rate, and magnetic field affect the discharge behavior. Finally, a preliminary assessment of the propulsive performance is performed. 📌 Title: Far-field plume characterization of a low-power cylindrical Hall thruster ✒ Authors: Tatiana Perrotin, Alfio E. Vinci, Stéphane MAZOUFFRE, Pablo Fajardo, Eduardo Ahedo, Jaume Navarro Cavallé 🤝 A collaboration between the EP2 group of Universidad Carlos III de Madrid and the ICARE lab of CNRS 💡 Published in the Journal of Applied Physics by AIP Publishing 👉 https://lnkd.in/g2qd9FKw This work was initiated under the project ESPEOS funded by Agencia Estatal de Investigación under Grant No. PID2019-108034RB-I00. The authors also acknowledge the project COMIT funded by the Agencia Estatal de Investigación as well under Grant No. PDC2021-120911-I00. EPS UC3M UC3M - PhD Program in Aerospace Engineering #ElectricPropulsion #PlasmaDiagnostics #OpenAccess