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Data-Driven Prediction of Mechanical Properties in support of Rapid Certification of Additively Manufactured Alloys

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Computer Modeling in Engineering & sciences 2018年第12期117卷 343-366页

作者： Fuyao Yan Yu-Chin Chan Abhinav saboo jiten shah Gregory BOlson Wei Chen Department of Materials science and Engineering Northwestern University2220 Campus DrEvanstonIL 60208USA Department of Mechanical Engineering Northwestern University2145 Sheridan RdEvanstonIL 60208USA QuesTek Innovations LLC 1820 Ridge AveEvanstonIL 60201USA Product Development&Analysis LLC 1776 Legacy CircleSuite#115NapervilleIL 60563USA.

Predicting the mechanical properties of additively manufactured parts is often a tedious process,requiring the integration of multiple stand-alone and expensive ***,as properties are highly location-dependent due to repeated heating and cooling cycles,the properties prediction models must be run for multiple locations before the part-level performance can be analyzed for certification,compounding the computational *** work has proposed a rapid prediction framework that replaces the physics-based mechanistic models with Gaussian process metamodels,a type of machine learning model for statistical inference with limited *** metamodels can predict the varying properties within an entire part in a fraction of the time while providing uncertainty *** framework was demonstrated with the prediction of the tensile yield strength of Ferrium?PH48s maraging stainless steel fabricated by additive *** agreement was found between the metamodels and the mechanistic models,and the computation was dramatically decreased from hours of physics-based simulations to less than a second with *** method can be extended to predict various materials properties in different alloy systems whose processstructure-property-performance interrelationships are linked by mechanistic *** is powerful for rapidly identifying the spatial properties of a part with compositional and processing parameter variations,and can support part certification by providing a fast interface between materials models and part-level thermal and performance simulations.

关键词： Additive manufacturing spatially-varying properties Gaussian process modeling statistical sensitivity analysis maraging stainless steel yield strength.

Property mapping of polycrystalline diamond coatings over large area

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Journal of Advanced Ceramics 2014年第1期3卷 56-70页

作者： Awadesh Kumar MALLIK sandip BYsAKH Monjoy sREEMANY sudakshina ROY jiten GHOsH soumyendu ROY Joana Catarina MENDEs Jose GRACIO someswar DATTA CsIR-Central Glass&Ceramic Research Institute Kolkata 700032West BengalIndia Department of Physics Indian Institute of Technology BombayPowaiMumbai 400076MaharashtraIndia Instituto de Telecomunicações Campus Universitário de Santiago3810-193Portugal Nanotechnology Research Division Centre for Mechanical Technology and AutomationUniversity of Aveiro3810-193Portugal

Large-area polycrystalline diamond(PCD)coatings are important for fields such as thermal management,optical windows,tribological moving mechanical assemblies,harsh chemical environments,biological sensors,*** plasma chemical vapor deposition(MPCVD)is a standard technique to grow high-quality PCD films over large area due to the absence of contact between the reactive species and the filament or the chamber ***,the existence of temperature gradients during growth may compromise the desired uniformity of the final diamond *** the present work,a thick PCD coating was deposited on a 100-mm silicon substrate inside a 915-MHz reactor;the temperature gradient resulted in a non-uniform diamond *** attempt was made to relate the local temperature variation during deposition and the different properties of the final *** was found that there was large instability inside the system,in terms of substrate temperature(as high asΔT=212℃),that resulted in a large dispersion of the diamond coating’s final properties:residual stress(-15.8 GPa to+6.2 GPa),surface morphology(octahedral pyramids with(111)planes to cubo-octahedrals with(100)flat top surfaces),thickness(190μm to 245μm),columnar growth of diamond(with appearance of variety of nanostructures),nucleation side hardness(17 GPa to 48 GPa),quality(Raman peak FWHM varying from 5.1 cm^(-1) to 12.4 cm^(-1) with occasional splitting).This random variation in properties over large-area PCD coating may hamper reproducible diamond growth for any meaningful technological application.

关键词： plasma-enhanced chemical vapor deposition(CVD) diamond film mechanical properties nanostructures

Giant left ventricular pseudoaneurysm presenting with hemoptysis

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World Journal of Cardiology 2012年第6期4卷 218-220页

作者： Rajesh Vijayvergiya Jay Pattam sandeep s Rana jiten D s.ngh Goverdhan D Puri Manphool s.nghal Department of Cardiology Advanced Cardiac Centre Post Graduate Institute of Medical Education and Research Chandigarh 160 012 India Department of Cardio-thoracic surgery Advanced Cardiac Centre Post Graduate Institute of Medical Education and Research Chandigarh 160 012 India Department of Anesthesia Advanced Cardiac Centre Post Graduate Institute of Medical Education and Research Chandigarh 160 012 India Department of Radio-diagnosis Advanced Cardiac Centre Post Graduate Institute of Medical Education and Research Chandigarh 160 012 India

Left ventricular (LV) pseudoaneurysm is a late mechanical complication of myocardial infarction (MI). A giant LV pseudoaneurysm is a rare presentation. We report a case of a giant LV pseudoaneurysm in a post MI patient, who presented with hemoptysis. Hemoptysis is a rare clinical presentation of LV pseudoaneurysm. The patient had successful surgical repair of the aneurysm and had a favorable outcome in 9 mo’ follow-up. The imaging modalities and surgical treatment of a pseudoaneurysm is discussed.

关键词： Left ventricle pseudoaneurysm Hemoptysis Myocardial infarction surgical repair

synthesis of Cu(II), Ni(II), Co(II), and Mn(II) Complexes with Ciprofloxacin and Their Evaluation of Antimicrobial, Antioxidant and Anti-Tubercular Activity

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Open Journal of Metal 2012年第3期2卷 49-59页

作者： Ketan s. Patel jiten C. Patel Hitesh R. Dholariya Vishal K. Patel Kanuprasad D. Patel Chemistry Department Shree P. M. Patel College of Peramedical Science & Technology Sardar Patel University Gujarat- India Chemistry Department V. P. & R. P. T. P. Science College Sardar Patel University Vallabh Vidhyanagar Gujarat-India

Co(II), Ni(II), Cu(II) and Mn(II) complexes synthesized by reflux of 6-bromo-3-(3-(4-chlorophenyl)acryloyl)-2H- chromen-2-one, Ciprofloxacin and various transition metal. 1H, 13C, IR and EsI Mass confirm the formation of ligand. The metal complexes were characterized on the basis of various spectroscopic techniques like IR studies and elemental analysis while the geometry of complexes was octahedral which is confirmed by electronic spectra and thermogravimetric analysis. The compounds were subjected to antimicrobial, antioxidant and anti-tubercular activity screening using serial broth dilution method and Minimum Inhibitory Concentration (MIC) is determined. Mn(II) complex has shown significant antifungal activity with an MIC of 6.25 μg/ml while Cu(II) complex is noticeable for antibacterial activity at the same concentration. Anti-TB activity of the ligand has enhanced on complexation with Ni(II) and Co(II) ions. While Ni(II) complex shows superior antioxidant activity than other complexes.

关键词： Transition Metal Complex Ciprofloxacin Biological Activity