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Inverse design of truss lattice materials with superior buckling resistance

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npj Computational Materials 2022年第1期8卷 2361-2372页

作者： Marco Maurizi Chao Gao filippo berto Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology(NTNU)Trondheim7491Norway

Manipulating the architecture of materials to achieve optimal combinations of properties(inverse design)has always been the dream of materials scientists and *** represent an efficient way to obtain lightweight yet strong materials,providing a high degree of *** massive research has been done on lattice architectures,the inverse design problem of complex phenomena(such as structural instability)has remained *** deep neural network and genetic algorithm,we provide a machine-learning-based approach to inverse-design non-uniformly assembled *** basic building blocks,our approach allows us to independently control the geometry and topology of periodic and aperiodic *** an example,we inverse-design lattice architectures with superior buckling performance,outperforming traditional reinforced grid-like and bio-inspired lattices by~30–90%and 10–30%,*** results provide insights into the buckling behavior of beam-based lattices,opening an avenue for possible applications in modern structures and infrastructures.

关键词： buckling inverse lattice

Effect of graphene oxide on the corrosion,mechanical and biological properties of Mg-based nanocomposite

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 305-319页

作者： Saeid Jabbarzare Hamid Reza Bakhsheshi-Rad Amir Abbas Nourbakhsh Tahmineh Ahmadi filippo berto Department of Materials Science Shahreza BranchIslamic Azad UniversityShahrezaIran Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology7491 TrondheimNorway

This study investigates the effect of graphene oxide(GO)on the mechanical and corrosion behavior,antibacterial performance,and cell response of Mg–Zn–Mn(MZM)***/GO nanocomposites with different amounts of GO(i.e.,0.5 wt%,1.0 wt%,and1.5 wt%)were fabricated by the semi-powder metallurgy *** influence of GO on the MZM nanocomposite was analyzed through the hardness,compressive,corrosion,antibacterial,and cytotoxicity *** experimental results showed that,with the increase in the amount of GO(0.5 wt%and 1.5 wt%),the hardness value,compressive strength,and antibacterial performance of the MZM nanocomposite increased,whereas the cell viability and osteogenesis level decreased after the addition of 1.5 wt%***,the electrochemical examination results showed that the corrosion behavior of the MZM alloy was significantly enhanced after encapsulation in 0.5 wt%*** summary,MZM nanocomposites reinforced with GO can be used for implant applications because of their antibacterial performance and mechanical property.

关键词： magnesium-based nanocomposite graphene oxide powder metallurgy method mechanical property antibacterial activity biocompatibility

Design and Analysis of Energy Absorbent Bioinspired Lattice Structures

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Journal of Bionic Engineering 2023年第4期20卷 1670-1686页

作者： Lucrezia Greco Federica Buccino Zhuo Xu Laura Vergani filippo berto Mario Guagliano Seyyed Moahmmad Javad Razavi Sara Bagherifard Department of Mechanical Engineering Politecnico di MilanoMilanItaly Department of Mechanical and Industrial Engineering Norwegian University of Science and TechnologyTrondheimNorway Chemical Engineering and Materials Environment Department Sapienza University of RomeRomeItaly

The increasing demand for energy absorbent structures,paired with the need for more efficient use of materials in a wide range of engineering fields,has led to an extensive range of designs in the porous forms of sandwiches,honeycomb,and *** achieve an even better performance,an ingenious solution is to learn how biological structures adjust their configurations to absorb energy without catastrophic *** this study,we have attempted to blend the shape freedom,offered by additive manufacturing techniques,with the biomimetic approach,to propose new lattice structures for energy absorbent *** this aim we have combined multiple bio-inspirational sources for the design of optimized configurations under compressive *** lattice structures are fabricated based on the designed unit cell geometries and studied using experimental and computational *** individual effect of each bio-inspired feature has been evaluated on the energy absorbance performance of the designed *** on the design parameters of the lattices,a tuning between the strength and energy absorption could be obtained,paving the way for transition within a wide range of real-life applicative scenarios.

关键词： Energy absorbance Lattice structures Bio-inspiration Fused deposition modeling Lightweight design

On the evaluation of ALD TiO_(2),ZrO_(2) and HfO_(2) coatings on corrosion and cytotoxicity performances

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Journal of Magnesium and Alloys 2021年第5期9卷 1828-1841页

作者： Mirco Peron Susanna Cogo Maria Bjelland Abdulla Bin Afif Anup Dadlani Elisa Greggio filippo berto Jan Torgersen Department of Industrial and Mechanical Engineering Norwegian University of Science and TechnologyRichard Birkelands vei 2b7034 TrondheimNorway Department of Biology University of PadovaVia Ugo Bassi 58/b35131PadovaItaly

Magnesium alloys have been widely studied as materials for temporary implants,but their use has been limited by their corrosion ***,coatings have been proven to provide an effective *** only little explored in the field,Atomic Layer Deposition(ALD)stands out as a coating technology due to the outstanding film conformality and density ***,we provide first insights into the corrosion behavior and the induced biological response of 100 nm thick ALD TiO_(2),HfO_(2)and ZrO_(2)coatings on AZ31 alloy by means of potentiodynamic polarization curves,electrochemical impedance spectroscopy(EIS),hydrogen evolution and MTS colorimetric assay with L929 *** three coatings improve the corrosion behavior and cytotoxicity of the ***,HfO_(2)coatings were characterized by the highest corrosion resistance and cell viability,slightly higher than those of ZrO_(2)***_(2)was characterized by the lowest corrosion improvements and,though generally considered a biocompatible coating,was found to not meet the demands for cellular applications(it was characterized by grade 3 cytotoxicity after 5 days of culture).These results reveal a strong link between biocompatibility and corrosion resistance and entail the need of taking the latter into consideration in the choice of a biocompatible coating to protect degradable Mg-based alloys.

关键词： Atomic layer deposition(ALD) Coatings Corrosion resistance Cytocompatibility Magnesium

The interface of SiO_2/ZnS films studied by high resolution X-ray photoluminescence

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Theoretical & Applied Mechanics Letters 2018年第1期8卷 24-27页

作者： Shinjita Acharya Orlando Trejo Anup Dadlani Jan Torgersen filippo berto Fritz Prinz Department of Mechanical Engineering Stanford University Department of Chemistry Stanford University Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology Department of Materials Science and Engineering Stanford University

Sharp interfaces in optoelectronic devices are key for proper band alignment. Despite its benefits as buffer layer, ZnS deposited via atomic layer deposition(ALD) renders intermixed interfaces to its substrate, which can be detrimental for device performance. Here, we are attempting to elucidate the chemical species deriving from this metal-oxide to metal-sulfide transition studying ultrathin film ZnS on SiO_2 using high resolution X-ray photoluminescence spectroscopy(XPS).Regarding the S 2p spectra after a deposition of only three cycles of ZnS, we discover the many different chemical species in which S is present. These include intermediate oxides such as SO_4^(2-).These species become more obvious as we tilt the sample in the XPS chamber to shallower *** the Si 2p and S 2p high resolution peaks in the depth profile, one can clearly uncover the confinement of SO_4^(2-) to the interface of the underlying substrate. This may indicate that SiO_2/ZnS interfaces contain interfacial sulphates that likely alter the electronic configuration of this interface.

关键词： Atomic Layer Deposition Metal-Sulfide Zinc Sulfide Interface High resolution X-ray photoluminescence spectroscopy

Wear-resistant Ag-MAX phase 3D interpenetrating-phase composites:Processing,structure,and properties

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Nano Research 2024年第2期17卷 806-819页

作者： Yu Guo Xi Xie Zengqian Liu Longchao Zhuo Jian Zhang Shaogang Wang Qiqiang Duan Qing Jia Dake Xu Weihai Xue Deli Duan filippo berto Zhefeng Zhang Rui Yang Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Chemical Engineering Materials and EnvironmentSapienza University of RomeRoma 00185Italy

Electrical contact materials are generally Ag-or Cu-based composites and play a critical role in ensuring the reliability and efficiency of electrical equipments and electronic *** MAX(M is an early transition metal,A is an element from III or IV main groups,and X is carbon or/and nitrogen)phase ceramics display a unique combination of properties and may serve as an ideal reinforcement phase for electrical contact *** biological materials evolved in nature generally exhibit three-dimensional(3D)interpenetrating-phase architectures,which may offer useful inspiration for the architectural design of electrical contact ***,a series of bi-continuous Ag-Ti_(3)SiC_(2) MAX phase composites with high ceramic contents exceeding 50 vol.%and having micron-and ultrafine-scaled 3D interpenetrating-phase architectures,wherein both constituents were continuous and mutually interspersed,were exploited by pressureless infiltration of Ag melt into partially sintered Ti_(3)SiC_(2) *** mechanical and electrical properties as well as the friction and wear performance of the composites were investigated and revealed to be closely dependent on the ceramic contents and characteristic structural *** composites exhibited a good combination of properties with high hardness over 2.3 GPa,high flexural strength exceeding 530 MPa,decent fracture toughness over 10 MPa·m^(1/2),and good wear resistance with low wear rate at an order of 10^(-5)mm^(3)/(N·m),which were much superior compared to the counterparts made by powder metallurgy *** particular,the hardness,electrical conductivity,strength,and fracture toughness of the composites demonstrated a simultaneous improvement as the structure was refined from micron-to ultrafine-scales at equivalent ceramic *** good combination of properties along with the facile processing route makes the Ag-Ti_(3)SiC_(2)3D interpenetrating-phase composites appealing for electrical contact applicatio

关键词： three-dimensional(3D)interpenetrating-phase architecture Ag-MAX(M=early transition metal A=element from III or IV main groups and X=carbon or/and nitrogen)phase composites melt infiltration electrical contact materials mechanical

Surface modification of magnesium alloys using thermal and solid-state cold spray processes:Challenges and latest progresses

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Journal of Magnesium and Alloys 2022年第8期10卷 2025-2061页

作者： Mohammadreza Daroonparvar Hamid Reza Bakhsheshi-Rad Abbas Saberi Mahmood Razzaghi Ashish K Kasar Seeram Ramakrishna Pradeep L.Menezes Manoranjan Misra Ahmad Fauzi Ismail Safian Sharif filippo berto Department of Mechanical Engineering University of NevadaRenoNV89501USA Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore Department of Chemical and Materials Engineering University of NevadaRenoNV89501USA Advanced Membrane Technology Research Center(AMTEC) Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Faculty of Engineering Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology7491 TrondheimNorway

Potential engineering applications of magnesium(Mg)and Mg-based alloys,as the lightest structural metal,have made them a popular subject of ***,the inferior corrosion and wear characteristics significantly limit their application *** is widely recognized that surface treatment is the most commonly utilized technique for remarkably improving a substrate’s surface *** methods have been introduced for the surface treatment of Mg and Mg-based alloys to improve their corrosion behavior and tribological *** these,thermal spray(TS)technology provides several methods for deposition of various functional metallic,ceramic,cermet,or other coatings tailored to particular *** researches have shown the tremendous potential for thermal spray coated Mg alloys for biomedical and industrial *** this context,the cold spray(CS)method,as a comparatively new TS coating technique,can generate the coating layer using kinetic energy rather than combined thermal and kinetic energies,like the high-velocity oxy-fuel(HVOF)spray ***,the CS process,as a revolutionary method,is able to repair and refurbish with a faster turnaround time;it also provides solutions that do not require dealing with the thermal stresses that are part of the other repair processes,such as welding or other TS processes using a high-temperature *** this review paper,the recently designed coatings that are specifically applied to Mg alloys(primarily for industrial applications)employing various coating processes are *** of the increased utilization of CS technology for both 3D printed(additively manufactured)coatings and repair of structurally critical components,the most recent CS methods for the surface treatment,repair,and refurbishment of Mg alloys as well as their benefits and restrictions are then discussed and reviewed in ***,the prospects of this field of study are briefly discussed,along with a summa

关键词： Mg-based alloys Surface modification Thermal and cold spray processes Corrosion behavior Wear resistance

Bacterial cell-free expression technology to in vitro systems engineering and optimization

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Synthetic and Systems Biotechnology 2017年第2期2卷 97-104页

作者： filippo Caschera Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris(ESPCI Paris) CNRS UMR 708310 Rue Vauquelin75231 Paris Cedex 05France

Cell-free expression system is a technology for the synthesis of proteins in *** system is a platform for several bioengineering projects,***-free metabolic engineering,evolutionary design of experiments,and synthetic minimal cell *** cell-free protein synthesis system(CFPS)is a robust tool for synthetic *** bacteria lysate,the DNA,and the energy module,which are the three optimized sub-systems for in vitro protein synthesis,compose the integrated ***,an optimized *** cell-free expression system can produce up to^2.3 mg/mL of a fluorescent reporter ***,I will describe the features of ATP-regeneration systems for in vitro protein synthesis,and I will present a machine-learning experiment for optimizing the protein yield of *** cell-free protein synthesis ***,I will introduce experiments on the synthesis of a minimal cell using liposomes as dynamic containers,and *** cell-free expression system as biochemical platform for metabolism and gene *** can be further integrated with other technologies for novel applications in environmental,medical and material science.

关键词： Cell-free protein synthesis Engineering Optimization Polysaccharide ATP-regeneration Machine-learning Synthetic minimal cell

“Noisy”issues in road acoustics:A white paper

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Journal of Road Engineering 2022年第1期2卷 61-69页

作者： filippo Giammaria Praticò DIIES Department University Mediterranea of Reggio CalabriaReggio Calabria 89124Italy

Despite almost a century of studies dealing with traffic noise,researchers and practitioners still face old and new issues when designing a low-noise *** that,this manuscript aims at focusing on a number of unsolved questions,namely theoretical or technological.1)Is it viable to balance diverse road-related needs(i.e.,noise,expected life,texture levels,and friction)?2)How much does the pavement material affect its acoustic performance(the remaining factors being constant)?3)How much reliable is the relationship between road texture and mixture aggregate gradation?Based on the analysis of these issues,it emerges that:1)optimal pavement design involves complex mix optimization and there are theoretical and practical bases to set up a balanced approach to address the complexity of pavement design;2)high percentages of crumb rubber could optimise road acoustic response but this latter has a relationship with the tyre/road noise(expressed,for example,in terms of close proximity index)that calls for further investigation;3)aggregate gradation appears to be a reliable basis to predict surface texture and therefore,under given boundary conditions,tyre/road noise;and 4)further studies and investigations are needed in terms of local calibration of deterioration curves and setting up of a sound method to assess the frequency response of asphalt concretes and to govern on-site noise indicators based on mixture properties.

关键词： Aggregate gradation Complex design Noise Surface texture Tyre/road interaction