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Modeling of recrystallization behaviour of AA6XXX aluminum alloy profile during extrusion process

Transactions of Nonferrous Metals Society of China 2024年

作者： Marco Negozio Antonio Segatori Riccardo Pelaccia Barbara Reggiani sara di donato Lorenzo Donati University of Parma-Department of Engineering and Architecture， Parco Area delle Scienze Hydro， Innovation and Technology diSMI Department of Sciences and Methods for Engineering， University of Modena and Reggio Emilia InterMech-MO.RE – University of Modena and Reggio Emilia diN Department of Industrial Engineering – University of Bologna

An innovative approach was introduced for the development of a AA6063 recrystallization model. This method incorporated a regression-based technique for the determination of material constants and introduced novel equations for assessing the grain size evolution. Calibration and validation of this methodology involved a combination of experimentally acquired microstructural data from the extrusion of three different AA6063 profiles and results from the simulation using the Qform Extrusion UK finite element code. The outcomes proved the agreement between experimental findings and numerical prediction of the microstructural evolution. The trend of the grain size variation based on different process parameters has been accurately simulated， both after dynamic and static recrystallization， with an error rate of less than 25% in almost the whole sampling computations.

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Modeling of recrystallization behaviour of AA6xxx aluminum alloy during extrusion process

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Transactions of Nonferrous Metals Society of China 2024年第10期34卷 3170-3184页

作者： Marco NEGOZIO Antonio SEGATORI Riccardo PELACCIA Barbara REGGIANI sara di donato Lorenzo DONATI University of Parma-Department of Engineering and Architecture Parco Area delle Scienze181/A43124 ParmaItaly Hydro Innovation and TechnologyMyrkärrsvägen 161231 FinspångSweden diSMI Department of Sciences and Methods for Engineering University of Modena and Reggio EmiliaVia Amendola 242122Reggio EmiliaItaly InterMech-MO.RE–University of Modena and Reggio Emilia Piazzale Europa 1Reggio Emilia 42124Italy diN Department of Industrial Engineering–University of Bologna Viale Risorgimento 240136BolognaItaly

An innovative approach was introduced for the development of a AA6063 recrystallization *** method incorporated a regression-based technique for the determination of material constants and introduced novel equations for assessing the grain size *** and validation of this methodology involved a combination of experimentally acquired microstructural data from the extrusion of three different AA6063 profiles and results from the simulation using the Qform Extrusion UK finite element *** outcomes proved the agreement between experimental findings and numerical prediction of the microstructural *** trend of the grain size variation based on different process parameters was accurately simulated,both after dynamic and static recrystallization,with an error of less than 25% in almost the whole sampling computations.

关键词： recrystallization simulation aluminum alloy extrusion finite element method microstructure prediction

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挤压过程中AA6xxx铝合金型材的再结晶行为模拟（英文）

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Transactions of Nonferrous Metals Society of China 2024年第10期 3170-3184页

作者： Marco NEGOZIO Antonio SEGATORI Riccardo PELACCIA Barbara REGGIANI sara di donato Lorenzo DONATI University of Parma-Department of Engineering and Architecture Hydro Innovation and Technology diSMI Department of Sciences and Methods for Engineering University of Modena and Reggio Emilia InterMech-MO.RE–University of Modena and Reggio Emilia diN Department of Industrial Engineering–University of Bologna

介绍了一种开发AA6063铝合金再结晶模型的创新方法。该方法结合了基于回归分析的材料常数测定技术，并引入了评估晶粒尺寸演变的新方程。该方法的校准和验证结合了从3种AA6063铝合金型材的挤压实验中获得的显微组织数据和使用Qform Extr... 详细信息

介绍了一种开发AA6063铝合金再结晶模型的创新方法。该方法结合了基于回归分析的材料常数测定技术，并引入了评估晶粒尺寸演变的新方程。该方法的校准和验证结合了从3种AA6063铝合金型材的挤压实验中获得的显微组织数据和使用Qform Extrusion UK有限元代码模拟的结果。结果表明，显微组织演化的实验结果与数值模拟的预测结果相吻合。该方法准确模拟了动态再结晶和静态再结晶后晶粒尺寸随不同工业参数变化的趋势，在几乎整个抽样计算中，误差都小于25%。

关键词：再结晶模拟铝合金挤压有限元法显微组织预测

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Efficacy and tolerability of high and low-volume bowel preparation compared:A real-life single-blinded large-population study

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World Journal of Gastrointestinal Endoscopy 2021年第12期13卷 659-672页

作者： Vincenzo Occhipinti Paola Soriani Francesco Bagolini Valentina Milani Emanuele Rondonotti Maria Laura Annunziata Flaminia Cavallaro sara Vavassori Maurizio Vecchi Luca Pastorelli Gian Eugenio Tontini digestive Endoscopy and Gastroenterology Unit A.Manzoni HospitalASST LeccoLecco 23900Italy Gastroenterology Unit IRCCS Policlinico San DonatoSan Donato Milanese 20097Italy Gastroenterology and digestive Endoscopy Unit Azienda USL ModenaCarpi HospitalCarpi 41012Italy Scientific directorate IRCCS Policlinico San DonatoSan Donato Milanese 20097Italy Gastroenterology Unit Ospedale ValduceComo 22100Italy Gastroenterology and Endoscopy Unit Fondazione IRCCS Ca'Granda Ospedale Maggiore PoliclinicoMilan 20122Italy Gastroenterology and Hepatology Unit ASST Santi Paolo e CarloMilan 20142Italy Department of Pathophysiology and Transplantation University of MilanMilan 20122Italy Department of Biomedical Sciences for Health University of MilanMilan 20122Italy

BACKGROUND Low-volume preparations for colonoscopy have shown similar efficacy compared to high-volume ones in randomized controlled trials(RCT).However,most RCTs do not provide data about clinical outcomes including lesions detection ***,real-life comparisons are *** To compare efficacy(both in terms of adequate bowel preparation and detection of colorectal lesions)and tolerability of a high-volume(HV:4 L polyethylene glycol,PEG)and a low-volume(LV:2 L PEG plus bisacodyl)bowel preparation in a real-life *** Consecutive outpatients referred for colonoscopy were prospectively enrolled between 1 December 2014 and 31 December *** could choose either LV or HV preparation,with a day-before schedule for morning colonoscopies and a split-dose for afternoon *** bowel preparation according to Boston Bowel Preparation Scale(BBPS),clinical outcomes including polyp detection rate(PDR),adenoma detection rate(ADR),advanced adenoma detection rate(AADR),sessile/serrated lesion detection rate(SDR)and cancer detection rate and self-reported tolerability of HV and LV were blindly *** Total 2040 patients were enrolled and 1815(mean age 60.6 years,50.2%men)finally *** was chosen by 52%of patients(50.8%of men,54.9%of women).Split-dose schedule was more common with HV(44.7%vs 38.2%,P=0.005).High-definition scopes were used in 33.4%of patients,without difference in the two groups(P=0.605).HV and LV preparations showed similar adequate bowel preparation rates(89.2%vs 86.6%,P=0.098),also considering the two different schedules(HV split-dose 93.8%vs LV split-dose 93.6%,P=1;HV daybefore 85.5%vs LV day-before 82.3%,P=0.182).Mean global BBPS score was higher for HV preparations(7.1±1.7 vs 6.8±1.6,Pdications for colonoscopy,HV preparation resulted higher in PDR[Odds ratio(OR)1.32,95%CI:1.07-1.63,P=0.011]and ADR(OR 1.29,95%CI 1.02–1.63,P=0.038)and comparable to LV in AADR(OR 1.51

关键词： Bowel preparation volume Polyethylene glycol Bisacodyl Colonoscopy Colonic adenomas Tolerability

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