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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231003T163000
DTEND;TZID=Europe/Rome:20231003T174500
DTSTAMP:20260508T175056
CREATED:20230929T085919Z
LAST-MODIFIED:20230929T085919Z
UID:31565-1696350600-1696355100@www.dica.polimi.it
SUMMARY:Bio e-methane from CO2 and green H2
DESCRIPTION:Ricomincia l’appuntamento con il secondo ciclo di PhDTalks\, il primo seminario si terrà Martedì 3 ottobre in aula Fassò (Edificio 4A)\, dalle 16:30 alle 17:45 CET. \nPhDTalks è una serie di seminari e discussioni tra dottorandi. Gli eventi hanno lo scopo di fornire un luogo dove creare un network tra dottorandi ed entrare in contatto con i molti progetti sviluppati nel nostro dipartimento. \nLa speaker Anna Santus condurrà un seminario dal titolo “Bio e-methane from CO2 and green H2”.  \nAl termine dell’evento sarà disponibile un piccolo rinfresco finanziato dal dipartimento. \nSarà possibile seguire la conferenza anche online al seguente link. \nAbstract \nClimate change will have negative effects on human health\, economics\, the environment\, flora and fauna presence on the planet. For these reasons\, the necessity to find and use renewable energy sources\, such as bio e-methane\, is compelling. Bio e-methane can be generated by reducing carbon dioxide (CO2)\, a well-known greenhouse gas\, and green hydrogen (H2)\, through a biological process mediated by hydrogenotrophic methanogens (Archaea). The bio e-methane generated can be directly injected in the national natural gas grid and/or it can be used as a fuel in the transportation sector. During the PhD project\, both experimental and modelling activities of this biological process have been conducted. Experimental analysis\, carried out in batch and continuous operation\, have allowed to identify the microorganisms maximum velocity\, the optimal reactor configuration and also inhibition factors/nutrients deficiency. Modelling activities have validated experimental data collected and\, helped understanding physical aspect of gas-liquid mass of H2. Some noteworthy results achieved include: i) cultivation of hydrogenotrophic methanogens; ii) the development of a method for measuring the specific velocity of microorganisms (SHMA); iii) implementation of a model for the biological process. Looking ahead\, further insights into H2 gas-liquid mass transfer are needed to optimize the process\, as it remains a key aspect of this biological process. \nSpeaker’s bio \nAnna is a PhD student in Environmental and Infrastructure Engineering (36th cycle) at Politecnico di Milano. She has a Master of Science in Environmental and Land Planning Engineering obtained in 2019 at Politecnico di Milano. Her research activities are focused on anaerobic digestion processes and biological biogas upgrading. In her free time\, Anna loves playing soccer and hiking.
URL:https://www.dica.polimi.it/it/evento/bio-e-methane-from-co2-and-green-h2/
CATEGORIES:PHD Life,Seminari e conferenze
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231010T110000
DTEND;TZID=Europe/Rome:20231010T140000
DTSTAMP:20260508T175056
CREATED:20230920T081345Z
LAST-MODIFIED:20230920T081345Z
UID:31562-1696935600-1696946400@www.dica.polimi.it
SUMMARY:Riqualificazione energetica degli edifici: il benessere oltre al green
DESCRIPTION:Martedì 10 ottobre alle ore 11.00 presso l’Aula Magna (Edificio 1 – p.za Leonardo da Vinci\, 32 – Milano) si terrà un convegno dal titolo: “Riqualificazione energetica degli edifici: il benessere oltre al green“. \nIl convegno racconta i risultati dell’indagine\, commissionata dal Gruppo Gabetti e condotta dal Politecnico di Milano e dal Politecnico di Torino\, che analizza le preferenze degli italiani a livello di performance energetico-ambientali delle abitazioni e come queste influiscono sui prezzi di compravendita nelle città di Roma\, Milano\, Torino\, Firenze e Padova.\nL’analisi offre un quadro più puntuale dello stato attuale delle nostre abitazioni e indica la strada da seguire per gestirne la valorizzazione e le politiche di gestione\, risulta pertanto essere un prezioso supporto per l’orientamento delle scelte strategiche di investimento sugli asset. \nA seguire il programma della giornata:
URL:https://www.dica.polimi.it/it/evento/riqualificazione-energetica-degli-edifici-il-benessere-oltre-al-green/
CATEGORIES:Seminari e conferenze
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231017T150000
DTEND;TZID=Europe/Rome:20231017T160000
DTSTAMP:20260508T175056
CREATED:20231009T094845Z
LAST-MODIFIED:20231009T094845Z
UID:31568-1697554800-1697558400@www.dica.polimi.it
SUMMARY:Load tests on existing bridges to support safety assessment: state of the art and research perspectives
DESCRIPTION:Martedì 17 settembre dalle ore 15.00 alle ore 16.00 presso l’Aula 26.14 (Edificio 26 – Via Golgi\, 20 – Milano) si terrà un seminario dal titolo: “Load tests on existing bridges to support safety assessment: state of the art and research perspectives“\, tenuto da Daniele Losanno (Università di Napoli “Federico II” – Dipartimento di Strutture per l’Ingegneria e l’Architettura). \nAbstract \nLe prove di carico sui ponti sono tradizionalmente concepite per verificare la rispondenza del comportamento reale delle strutture a quello atteso e la risposta essenzialmente in campo elastico lineare. Negli ultimi anni a livello internazionale è stato introdotto il concetto del “bridge load testing”\, ovvero l’esecuzione di una prova di carico finalizzata a determinare una quantificazione del livello di sicurezza del ponte su base affidabilistica.  In Italia il tema risulta di particolare interesse per Gestori autostradali ed Enti locali che nei prossimi mesi dovranno implementare l’approccio multilivello previsto dalle nuove Linee Guida per la classificazione e la gestione del rischio\, la valutazione della sicurezza e il monitoraggio dei ponti esistenti. Nell’ambito del progetto che individua il Consorzio RELUIS quale soggetto attuatore della sperimentazione delle Linee Guida da parte del CSLLPP\, è attiva e in fase di sviluppo una linea di ricerca sul tema specifico. A partire dalle basi del metodo in termini di sicurezza e affidabilità strutturale rispetto a livelli di carico prescritti dalle norme\, verranno illustrate le possibili modalità di esecuzione della prova e l’importanza della definizione di soglie di allarme anche attraverso tecnologie innovative per il monitoraggio in tempo reale. Evidenziando inoltre la rilevanza di eventuali transiti eccezionali sull’opera\, saranno mostrati i risultati preliminari del caso reale di un viadotto autostradale – recentemente soggetto ad una prova di carico secondo NTC 2018 – per la valutazione degli effetti della prova sui livelli di sicurezza conseguiti. \nSpeaker’s bio \nDaniele Losanno è attualmente Ricercatore (RTDA) presso il Dipartimento di Strutture per l’Ingegneria e l’Architettura (DiST) dell’Università di Napoli “Federico II” dal 2020\, dove ha conseguito il Dottorato di ricerca nel 2015. E’ stato visiting PhD student presso la University of California Berkeley (2012) e Ricercatore presso l’Istituto delle Tecnologie della Costruzione del CNR (2019-2020). Si interessa di dinamica delle strutture per il controllo passivo delle vibrazioni con isolamento sismico e dissipazione di energia supplementare ed è PI di vari progetti di ricerca. E’ co-titolare dei corsi di Teoria e Progetto di Ponti e Monitoraggio di Strutture e Infrastrutture. E’ coinvolto in una vasta campagna sperimentale per la caratterizzazione di travi da ponte in c.a.p. a cavi post-tesi con difetti di iniezione e danneggiamento dei cavi. Ha collaborato alla redazione delle Linee Guida sui ponti esistenti nell’ambito del gruppo di lavoro sulle verifiche di sicurezza e partecipa attivamente alle attività del progetto di ricerca tra il consorzio RELUIS e il CSLLPP per la relativa sperimentazione.
URL:https://www.dica.polimi.it/it/evento/le-prove-di-carico-sui-ponti-esistenti-a-supporto-della-valutazione-della-sicurezza-stato-dellarte-e-prospettive-di-ricerca/
CATEGORIES:Seminari e conferenze
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231017T171500
DTEND;TZID=Europe/Rome:20231017T183000
DTSTAMP:20260508T175056
CREATED:20231014T101340Z
LAST-MODIFIED:20231014T101340Z
UID:31569-1697562900-1697567400@www.dica.polimi.it
SUMMARY:PhDTalks | Why should we recover P from sewage sludge? How can we get it?
DESCRIPTION:Il prossimo appuntamento con la serie di incontri PhDTalks si terrà Martedì 17 ottobre nell’aula Fassò (Edificio 4A)\, dalle 17:15 alle 18:30 CET. \nPhDTalks è una serie di seminari e discussioni tra dottorandi. Gli eventi hanno lo scopo di fornire un luogo dove creare un network tra dottorandi ed entrare in contatto con i molti progetti sviluppati nel nostro dipartimento. \nLa speaker Gaia Boniardi condurrà un seminario dal titolo “Why should we recover P from sewage sludge? How can we get it?”.  \nAl termine dell’evento sarà disponibile un piccolo rinfresco finanziato dal dipartimento. \nSarà possibile seguire la conferenza anche online al seguente link. \nAbstract  \nPhosphorus is an essential element for life and its supply is expected to be critical soon. The increasing demand for fertilizers is gradually depleting the phosphate rocks\, which are non-renewable resources concentrated in a few countries. On the other hand\, the population growth and the rapid urbanization are putting the wastewater treatment plants under strong pressure\, who are dealing with huge amounts of sewage sludge to dispose of every year. To tackle this issue\, in the view of circular economy and sustainable development\, phosphorus and nutrient recovery from sewage sludge is a promising option. The goal of this research is to optimize the phosphorous recovery from sewage sludge ash via wet chemical extraction. Experimental results underlined the influence of wastewater treatment layout and combustion process conditions on phosphorus extraction\, while the heavy metals decontamination played a fundamental role in the production of high-quality recovered material. \nSpeaker’s bio \nGaia is a PhD Candidate in Environmental and Infrastructure Engineering (36° cycle) at Politecnico di Milano. In 2020 she got a Master of Science in Environmental Engineering\, and she is currently working on nutrient recovery from waste\, in particular phosphorus from sewage sludge ash. In her free time\, she loves swimming\, surfing\, and traveling.
URL:https://www.dica.polimi.it/it/evento/why-should-we-recover-p-from-sewage-sludge-how-can-we-get-it/
CATEGORIES:PHD Life,Seminari e conferenze
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231023T170000
DTEND;TZID=Europe/Rome:20231023T183000
DTSTAMP:20260508T175056
CREATED:20231019T100139Z
LAST-MODIFIED:20231019T100139Z
UID:31570-1698080400-1698085800@www.dica.polimi.it
SUMMARY:Creep Buckling Behaviour of Concrete-filled Steel Tubular Arches
DESCRIPTION:Lunedì 23 ottobre alle ore 17.00 presso l’Aula Grandori (Edificio 4 – p.za Leonardo da Vinci\, 32 – Milano) si terrà un seminario dal titolo: “Creep Buckling Behaviour of Concrete-filled Steel Tubular Arches“\, tenuto da Yue Geng\, Professoressa di Structural Engineering presso l’Harbin Institute of Technology\, China. \nAbstract \nThe use of concrete-filled steel tubular (CFST) arches is becoming popular for bridge applications because of the increased load-carrying capacity\, convenience in construction\, and attractive appearance. Till 2023\, more than 600 CFST arch bridges have been built in China. With the improvements in material and construction techniques\, the span of newly built CFST arch bridges continues to increase\, and the longest span has reached to 600 m. As the span of CFST arch bridges increases\, the time-dependent behaviour of the core concrete in arch ribs becomes significant\, leading to considerably increase in arch deflections\, stress redistributions between steel and core concrete sections\, and even instability problems for the arches. This significant influence may trigger possible instability problems in slender CFST arches if not accurately accounted for. This presentation gains insight into the stability and creep buckling behavior of CFST arch bridges and investigates the key issues in the stability analysis of CFST arches\, including the residual stress\, the confinement effect\, the creep effect of the core concrete\, and the initial stress. This presentation also provides an accurate method to predict the time-dependent response of CFST arch bridges. \nBio-sketch \nYue Geng is Professor of Structural Engineering at Harbin Institute of Technology\, China. Prof Geng’s principal research interests lie in the composite structures and in concrete materials\, with particular research expertise on their time-dependent behaviours. Prof Yue Geng has co-authored 1 textbook\, 3 book chapters and 40 SCI journal papers\, and is good at both structural and material testing\, numerical modelling and the development of design methods. She has been granted 10 patents and software copyrights by the Chinese government. The research results have been applied to the refined design of 15 long-span or high-rise structures. She is co-chairing the Chinese design standard for recycled concrete composite structures that issued by the China Steel Construction Society. She is included in the working group for the ‘Concrete materials terminology’ standard ISO/TC 71/AHG 1 and 7 other Chinese designing codes for composite structures or recycled concrete materials. She is the editor of the International Journal of Concrete Structures and Materials. She was awarded the first prizes for scientific and technological progress by the Hei Long Jiang Province Government (2nd contributor) and by the China Steel Construction Society (3rd contributor).
URL:https://www.dica.polimi.it/it/evento/creep-buckling-behaviour-of-concrete-filled-steel-tubular-arches/
CATEGORIES:Seminari e conferenze
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231024T143000
DTEND;TZID=Europe/Rome:20231024T153000
DTSTAMP:20260508T175056
CREATED:20231019T101028Z
LAST-MODIFIED:20231019T101028Z
UID:31571-1698157800-1698161400@www.dica.polimi.it
SUMMARY:Recycled Aggregate Concrete Composite Structures
DESCRIPTION:Martedì 24 ottobre alle ore 14.30 presso l’Aula Grandori (Edificio 4 – p.za Leonardo da Vinci\, 32 – Milano) si terrà un seminario dal titolo: “Recycled Aggregate Concrete Composite Structures“\, tenuto da Huan Zhang\, Associate Professor di Structural Engineering presso la Scuola di Ingegneria Civile all’Harbin Institute of Technology\, Cina. \nAbstract \nNatural sand and stone resources are depleting rapidly\, and there is an urgent need to optimize the disposal methods for waste concrete. Recycled aggregate concrete (RAC) provides an effective solution to address these challenges. Steel-concrete composite structures can fully leverage the properties of materials\, compensating for the lower mechanical performance and higher discrepancies of RAC. The establishment of RAC mechanical properties models and the development of design method for steel-RAC composite structures is crucial for promoting the structural application of RAC. This presentation will delve into the influence mechanism of recycled aggregates\, discussing key issues in the development of mechanical property models for RAC and design methods for steel-RAC composite structures. Finally\, this presentation will introduce the proposed models for mechanical properties of RAC and design methods for RAC filled steel tubes and steel-RAC composite slab/beam systems\, addressing both load-carrying capacity and long-term performances. \nBio-sketch \nHuan Zhang is Associate Professor of Structural Engineering in the School of Civil Engineering at Harbin Institute of Technology. His research interests lie in the behaviours of steel-green concrete composite structures\, especially their long-term behaviours. He has published over 20 SCI/EI technical papers including Cement and Concrete Composites\, Engineering Structures\, Construction and Building Materials\, etc. He has been granted sever patents and two software copyrights by the Chinese government. He serves on the editor board of the Chinese design standard for recycled concrete composite structures (CSCS) that issued by the China Steel Construction Society. Prof. Zhang presided 5 scientific research projects\, including one project from National Natural Science Foundation of China. He was awarded the first prize for scientific and technological progress by the Hei Long Jiang Province Government. \n 
URL:https://www.dica.polimi.it/it/evento/recycled-aggregate-concrete-composite-structures/
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20231024T153000
DTEND;TZID=Europe/Rome:20231024T163000
DTSTAMP:20260508T175056
CREATED:20231019T102028Z
LAST-MODIFIED:20231019T102028Z
UID:31572-1698161400-1698165000@www.dica.polimi.it
SUMMARY:Behaviour of CFST Columns with Localized Corrosion Damage
DESCRIPTION:Martedì 24 ottobre alle ore 15.30 presso l’Aula Grandori (Edificio 4 – p.za Leonardo da Vinci\, 32 – Milano) si terrà un seminario dal titolo: “Behaviour of CFST Columns with Localized Corrosion Damage“\, tenuto da Chen Jia\, postdoc presso l’Harbin Institute of Technology\, Cina. \nAbstract \nDue to the outstanding structural performance\, concrete-filled steel tubes (CFST) are extensively applied in contemporary structures in marine towers\, bridge piers\, and coastal platforms. CFSTs can be subjected to localized corrosion damage during their long-time service\, because of the metallic properties of the steel tube and the corrosive medium in harsh working environments. Localized corrosion damage would cause a detrimental effect on CFST columns since it induces the continuous loss of the cross-section area of the steel tube\, as well as the loss of the confinement on the core concrete. This presentation will show the experimental and numerical investigations on CFSTs with simulated localized corrosion damage\, discuss corrosion-induced deterioration of load-carrying capacity of CFSTs\, and finally introduce the methods for predicting the residual strength of localized corroded CFSTs. \nBio-sketch \nDr. Chen Jia is now a postdoc at Harbin Institute of Technology. The main topics of her research are the post-corrosion performance of steel structures and steel-concrete composite structures. Dr. Jia presided/participated in 9 scientific research projects. She is co-author of over 20 papers published on Engineering Structures\, Thin-walled Structures\, Ocean Engineering et.al.\, and has acted as a reviewer for several scientific journals. She serves on the editor board of a design standard that issued by the China Association for Engineering Construction Standardization.
URL:https://www.dica.polimi.it/it/evento/behaviour-of-cfst-columns-with-localized-corrosion-damage/
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20231025T090000
DTEND;TZID=Europe/Rome:20231025T133000
DTSTAMP:20260508T175056
CREATED:20231009T084747Z
LAST-MODIFIED:20231009T084747Z
UID:31567-1698224400-1698240600@www.dica.polimi.it
SUMMARY:Una Metodologia per valutazioni Multi-Hazard e Multi-Rischio a supporto della pianificazione di Protezione Civile: risultati\, nodi\, prospettive
DESCRIPTION:Mercoledì 25 ottobre dalle ore 9.00 alle ore 13.30 presso l’Aula Fassò (Edificio 4A – p.za Leonardo da Vinci\, 32 – Milano) si terrà un seminario dal titolo: “Una Metodologia per valutazioni Multi-Hazard e Multi-Rischio a supporto della pianificazione di Protezione Civile: risultati\, nodi\, prospettive“. \nSarà anche possibile seguire l’evento online da WebEx. \nQui il programma della giornata:
URL:https://www.dica.polimi.it/it/evento/una-metodologia-per-valutazioni-multi-hazard-e-multi-rischio-a-supporto-della-pianificazione-di-protezione-civile-risultati-nodi-prospettive/
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20231025T123000
DTEND;TZID=Europe/Rome:20231025T140000
DTSTAMP:20260508T175056
CREATED:20231009T081349Z
LAST-MODIFIED:20231009T081349Z
UID:31566-1698237000-1698242400@www.dica.polimi.it
SUMMARY:Particle based simulations: from nano-chemo-mechanics to structural collapse optimization
DESCRIPTION:Mercoledì 25 ottobre alle ore 12.30 presso l’Aula Grandori (Edificio 4 – p.za Leonardo da Vinci\, 32 – Milano) si terrà un seminario dal titolo: “Particle based simulations: from nano-chemo-mechanics to structural collapse optimization“\, tenuto da Enrico Masoero (Politecnico di Milano – DICA). \nAbstract \nParticle-based simulations encompass a wide class of methods in the mechanics and physics of solids\, from molecular dynamics at the atomistic scale up to the Discrete Element method at the macroscale. A key ingredient in particle-based simulations are the interaction potentials and forces between particles; these control the dynamics and equilibrium of the simulated systems under agents such as temperature\, pressure\, chemical potentials\, applied strain\, etc. Within this framework\, the presentation will initially focus on simulating the microstructural evolution of materials under chemical reactions coupled with mechanical stress. An original Kinetic Monte Carlo simulator called MASKE will be presented to this end\, followed by applications to: (i) epitaxial nucleation and agglomeration of nanoparticles forming a mesoporous solid; (ii) stress-driven dissolution at crystallographic defects; (iii) creep and strain-dependent mechanics of nanocrystals under pressure-induced dissolution; (iv) eigenstress relaxation during cyclic deformations; (v) carbonation of calcium hydroxide as a self-healing mechanism for concrete (also mediated by bacteria); (vi) diffusion-limited dendrite growth on metal lithium electrodes. All these applications show how chemo-mechanical particle-based simulations\, when applied to the formation and degradation of microstructures\, can help gain mechanistic insight and inform the engineering models\, e.g. continuum-based ones. The presentation will then address a challenging question: can discrete simulations be combined with numerical optimization techniques to obtain structures (and microstructures) with desired properties and kinetics? A first attempt to address this question will be presented\, in the form of a software called DETO\, which extends to Discrete Element (DE) simulations the established SIMP (Solid Isotropic Material with Penalization) for Topology Optimization (TO). \nSpeaker’s bio \nEnrico Masoero is an Associate Professor at Politecnico di Milano and a member of the Mechanics of Materials and Structures group\, in the Department of Civil and Environmental Engineering. He obtained his PhD in Structural Engineering at Politecnico di Torino (2010)\, with a dissertation on particle-based simulations of building collapse. During his postdoc at MIT (2010-2013) his research shifted to the nanoscale of cement hydration. His subsequent years as a Lecturer and Senior Lecturer in the U.K. (Newcastle University 2013-2021 and Cardiff University 2021-2023) shaped his current interest in chemo-mechanical simulations and optimisation of microstructure formation and degradation. Enrico has authored various papers in international journals\, including in Physical Review Letters\, PNAS\, ACS Journal of Applied Materials and Interfaces\, and Cement and Concrete Research. He was Co-I in a large U.K. project on particle-based simulations of biomineralization (2020-2023). He is also a member of the Materials Properties committee of the Engineering Mechanics Institute\, of the American Society of Civil Engineers.
URL:https://www.dica.polimi.it/it/evento/particle-based-simulations-from-nano-chemo-mechanics-to-structural-collapse-optimization/
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20231027T090000
DTEND;TZID=Europe/Rome:20231027T160000
DTSTAMP:20260508T175056
CREATED:20231023T140521Z
LAST-MODIFIED:20231023T140521Z
UID:31573-1698397200-1698422400@www.dica.polimi.it
SUMMARY:Advanced numerical approaches to the modelling of tunnel excavation and construction
DESCRIPTION:La Società Italiana di Scavo (SIG) sta promuovendo eventi di insegnamento specifici in tutta Italia per diffondere la conoscenza tecnica e scientifica relativa a tutti gli argomenti legati allo scavo di gallerie. Un primo evento di successo è stato organizzato al Politecnico di Torino il 9 giugno 2023\, in cui sono state presentate diverse esperienze recenti nell’escavazione meccanizzata a sezione intera. \nQuesto secondo evento al Politecnico di Milano che si terrà venerdì 27 ottobre in aula Rogers (edificio 11) alle ore 9.00\, è dedicato alla presentazione dei metodi numerici più diffusi impiegati per risolvere i problemi di valore limite geotecnico\, con particolare enfasi sulla valutazione dei potenziali rischi legati allo scavo di gallerie. In particolare\, verranno presentati e discussi i metodi degli elementi distinti e degli elementi finiti\, con un focus sulla coppia idromeccanica\, le condizioni sismiche e le interferenze con le strutture e le infrastrutture già esistenti. \nQuesto evento è rivolto a ingegneri\, studenti e professionisti\, ed è concepito anche come introduzione a un volume recentemente pubblicato\, curato dalla Società Italiana di Scavo\, intitolato “Handbook on Tunnels and Underground Works: Volume 1: Concept – Basic Principles of Design”. \nPer vedere il programma completo della giornata e modalità di iscrizione cliccare sul seguente link. \n 
URL:https://www.dica.polimi.it/it/evento/advanced-numerical-approaches-to-the-modelling-of-tunnel-excavation-and-construction/
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20231031T171500
DTEND;TZID=Europe/Rome:20231031T183000
DTSTAMP:20260508T175056
CREATED:20231024T140205Z
LAST-MODIFIED:20231024T140205Z
UID:31574-1698772500-1698777000@www.dica.polimi.it
SUMMARY:PhDTalks | A fracture mechanics approach for fatigue life prediction of Ni-Ti peripheral stents
DESCRIPTION:Il prossimo appuntamento con la serie di incontri PhDTalks si terrà Martedì 31 ottobre nell’aula Fassò (Edificio 4A)\, dalle 17:15 alle 18:30 CET. \nPhDTalks è una serie di seminari e discussioni tra dottorandi. Gli eventi hanno lo scopo di fornire un luogo dove creare un network tra dottorandi ed entrare in contatto con i molti progetti sviluppati nel nostro dipartimento. \nLa speaker Alma Brambilla condurrà un seminario dal titolo “A fracture mechanics approach for fatigue life prediction of Ni-Ti peripheral stents”.  \nAl termine dell’evento sarà disponibile un piccolo rinfresco finanziato dal dipartimento. \nSarà possibile seguire la conferenza anche online al seguente link. \nAbstract  \nNickel-Titanium (Ni-Ti) stents are the gold standard in the mini-invasive treatment of atherosclerotic diseases affecting peripheral arteries. The fatigue fracture of these devices under in vivo cyclic loads constitutes an open issue of major concern given the severe associated drawbacks such as re-occlusion of the artery. However\, the non-linear material response and the reduced dimensions of stent struts increase the complexity of their fatigue assessment\, requiring ad hoc and well-defined methods. Despite many phenomenological approaches have been proposed\, open questions remain and more efforts are still required to understand and predict Ni-Ti thin struts failure under fatigue loads. This work aims at investigating the application of fracture mechanics principles for stent fatigue life assessment\, accounting for the propagation of pre-existing manufacturing defects. To this purpose\, crack propagation tests were performed on ad hoc samples\, characterized by a microstructure comparable to that of stents\, to gain the material crack growth rate. A proof-of-concept study was conducted at first\, performing an experimental fatigue campaign on multi-wires samples having the same dimension and material properties of stents. Fracture surfaces were inspected through a scanning electron microscope highlighting defect size at the initiation site of fracture. A crack propagation algorithm was herein calibrated\, introducing the non-linear fracture mechanics energetic parameter cyclic J-integral and integrating the crack growth law from the initial defect size observed on the fracture surfaces. Finally\, the same approach was adopted to predict the fatigue life of commercially-resembling stents (Fig. 1)\, experimentally tested under multi-axial loading conditions\, exploiting finite element simulations to assess the local cyclic stress-strain response in the failure regions. In both the studied applications\, promising life predictions were obtained\, demonstrating the role of fracture mechanics in explaining Ni-Ti struts fatigue failure. \nSpeaker’s bio \nAlma is a PhD student in Structural\, Seismic\, and Geotechnical Engineering (38th cycle) at Politecnico di Milano. She has a Master of Science in Biomedical and Mechanical Engineering obtained in 2022 at Politecnico di Milano through a Double Degree Programme.Her current research mainly addresses experimental characterization and numerical modeling of the fatigue behavior of cardiovascular devices made by Nickel-Titanium shape memory alloys\, focusing on the development of integrated predictive tools to assess fracture.\nIn her free time\, Alma enjoys hiking and reading.
URL:https://www.dica.polimi.it/it/evento/phdtalks-a-fracture-mechanics-approach-for-fatigue-life-prediction-of-ni-ti-peripheral-stents/
CATEGORIES:PHD Life,Seminari e conferenze
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