Materials Science and Technology (STM) @ Roma Tre’s Post

🚀 Exciting News! 🚀 📚Thrilled to announce the publication of our latest research paper: "The effect of different profile modifications on the static and dynamic transmission error of spur gears" in Mechanism and Machine Theory. ⚙️🔧In this work, we dive into the intricate world of gear systems, developing a novel analytical mesh stiffness model that takes into account profile modifications and load-induced line of action enlargement. This is achieved through a novel calculation loop based on load share convergence. This approach, verified against FEM simulations and experimental data, paves the way for microgeometric optimizations, enhancing both the efficiency and dynamic behavior of geared systems. A big thank you to my co-authors (Giovanni Paoli, Marco Cirelli) and my supervisor Professor Pier Paolo Valentini who made this possible. Looking forward to the valuable discussions and insights this study will spark in the community! 🔗 The paper is available for free download for the next 50 days! Check it out here: https://lnkd.in/dejF2UUm #Research #Engineering #GearSystems #MechanicalDesign #Innovation

Dr. Spalart CFD Lessons for FREE...! 🤯 👉 https://lnkd.in/ee5NtpGr Introduction to Turbulence Modeling in Computational Fluid Dynamics (CFD) - Dr. #Spalart will discuss the intricacies of turbulent flows and why we should use turbulence models as approximations instead of fully resolving the flow physics. Thanks to Flexcompute, Zongfu Yu / Wallace Penn Scott and the team for open-sourcing this! #engineeredmind #science #technology #engineering #mechanicalengineering #turbulence #mathematics #cfd #simulation

While some researchers describe cohesive zone models (CZMs) as a type of fracture mechanics model, it is really a type of damage mechanics model applied to interface regions rather than bulk regions. This was first described in a seminal paper by Alfano and Crisfield (2001) https://lnkd.in/ewveqYN3 In our own research we have formulated both continuum and discrete CZMs to model static and fatigue delamination in composites and glacier calving processes. For interface problems or where the potential crack path is known, I think cohesive elements are advantageous compared to continuum damage and phase field fracture models. Let me know if you agree or disagree with me. Jimenez, S., Liu, X., Duddu, R., & Waisman, H. (2014). A discrete damage zone model for mixed-mode delamination of composites under high-cycle fatigue. International Journal of Fracture, 190, 53-74. Gao, Y., Ghosh, G., Jiménez, S., & Duddu, R. (2023). A finite-element-based cohesive zone model of water-filled surface crevasse propagation in floating ice tongues. Computing in Science & Engineering.

𝐈𝐦𝐩𝐚𝐜𝐭 𝐨𝐟 𝐚 𝐣𝐞𝐥𝐥𝐲-𝐥𝐢𝐤𝐞 𝐦𝐚𝐭𝐞𝐫𝐢𝐚𝐥 In this simulation, a sample of clay suspension impacts a flat rigid surface. The numerical results is in a good agreement with the experimental data. 🔗 For details, see the publication «Impact simulation by an Eulerian model for interaction of multiple elastic-plastic solids and fluids» by sarah hank, Ph.D, Nicolas Favrie and Jacques Massoni, here is the link https://lnkd.in/eKPWJi-D 🔗Or «Multiphase Flow Modeling via Hamilton's Principle» by Prof. Gavrilyuk https://lnkd.in/eD48f4_b #cfd #cae #physics #engineering #science #researchanddevelopment #simulation

The amazing Strong Feelings that Goal Coach Shingyo !🚀 I’m thrilled to share that #BakaliyaPraful and I have successfully published our research paper titled "Comparing Toroidal Propeller Performance with Different Blade Numbers at Different RPM: The CFD Analysis and Evaluation leads to the final selection of a design".  In this research, we carried out a full-scale Computational Fluid Dynamics (CFD) analysis to test the effectiveness of toroidal propellers with various blade numbers at different rotational speeds. Our research results give us the information which is very useful in the field of optimal redesigning of the propeller in order to improve the efficiency and performance and thus contributes to the development in the industry of aerospace. We are delighted with the work and commitment that went into this research, and we are eager to look forward to the impact of our findings in the field of this research. An enormous thanks is from all of us to everyone who stood by us in this journey! The aerospace engineering is combining with the CFD to form the research on the propeller design that will later on be used in the engineering innovation. #AerospaceEngineering #CFD #Research #ToroidalPropellerDesign #EngineeringInnovation  

𝗗𝗶𝗱 𝘆𝗼𝘂 𝗸𝗻𝗼𝘄: 𝗗𝘆𝗻𝗮𝗺𝗶𝗰 𝗺𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝗮𝗹 𝗮𝗻𝗮𝗹𝘆𝘀𝗶𝘀 𝗮𝘁 𝗮 𝗻𝗮𝗻𝗼𝘀𝗰𝗮𝗹𝗲 𝗶𝘀 𝗽𝗼𝘀𝘀𝗶𝗯𝗹𝗲 𝘄𝗶𝘁𝗵 𝗱𝘆𝗻𝗮𝗺𝗶𝗰 𝗻𝗮𝗻𝗼-𝗶𝗻𝗱𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 𝗺𝗲𝘁𝗵𝗼𝗱𝘀! 🗜️ Researchers and engineers interested in mechanical characterization are invited to join this month's #CovalentAcademy webinar exploring dynamic nano-indentation. Shivesh Sivakumar will give you an intro to the fundamentals of this technique before exploring some of the more advanced applications it unlocks on Covalent's UNHT3 platform from Anton Paar USA. #nanomechanical #mechanicalanalysis #nanoindentation Register now at: https://bit.ly/3VZCrcQ

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

Micromagnetic simulation plays a pivotal role in the field of material science, particularly in understanding and designing magnetic materials. This simulation illustrate the dyanmic of magnetic domains https://lnkd.in/gq7aU2qx #magnetism

🚀 Progress Update on My Aerospace Structures Research Project! 🚀 I am thrilled to share the first milestone of my one-year-long Master of Science Research Project, titled "Estimation of the Overall Behaviour and Fracture Toughness for a Curved Double Cantilever Beam (DCB) test." On June 25th, my colleague Tommaso Pasti and I presented the progress of the project's initial phase, developed under the precious guidance of our supervisors, ERIC PAROISSIEN and Frédéric LACHAUD at ISAE-SUPAERO. Our research focuses on the critical area of fracture mechanics, specifically the delamination behavior in curved composite structures, which is vital for the integrity and safety of aerospace components. The behaviour of these configurations under delamination presents unique challenges that conventional materials do not exhibit. As a result, understanding the fracture toughness and delamination mechanisms in curved composite structures is essential for ensuring their reliability and performance in aerospace applications. Throughout this semester, we have implemented and validated analytical models to estimate the Energy Release Rate (ERR) for mode I delamination in curved DCB configurations. Our approach has involved implementing and comparing the Modified Beam Theory (MBT) and Compliance-Based Beam Method (CBBM) using ring segment specimens cut from Glass-Reinforced Polymer (GRP) pipes (shown in the figure, taken from Guedes et al. “An experimental and numerical assessment of DCB tests on glass/polyester curved beams cut out from pipes”). Additionally, we have used ABAQUS software for numerical simulations to corroborate our analytical findings. This validation process confirms the reliability of our approach in studying delamination behavior in curved composite structures, complemented by the implementation of the Virtual Crack Closure Technique (VCCT). Looking forward, we will extend our research to configurations where the curvature of the specimens is significant compared to their thickness, utilizing curved beam theory. We also plan to explore the impact of fiber orientation and material aging, and conduct real-world laboratory tests for further validation. I am grateful for the support and guidance from our supervisors and the collaborative effort with Tommaso Pasti. This research has been highly formative and pivotal in advancing our understanding of aerospace structures. Stay tuned for more updates as we continue to delve into the next steps of this exciting research! #AerospaceEngineering #Research #FractureMechanics #CompositeMaterials #DoubleCantileverBeam #FiniteElementAnalysis #ISAESUPAERO