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Static Analysis of Anisotropic Doubly-Curved Shell Subjected to Concentrated Loads Employing Higher Order Layer-Wise Theories

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Computer Modeling in Engineering & Sciences 2023年第2期134卷 1393-1468页

作者： Francesco Tornabene matteo Viscoti Rossana Dimitri Department of Innovation Engineering School of EngineeringUniversity of SalentoLecce73100Italy

In the presentmanuscript,a Layer-Wise(LW)generalizedmodel is proposed for the linear static analysis of doublycurved shells constrained with general boundary conditions under the influence of concentrated and surface *** unknown field variable is modelled employing polynomials of various orders,each of them defined within each layer of the *** a particular case of the LW model,an Equivalent Single Layer(ESL)formulation is derived *** approaches are outlined for the assessment of external forces,as well as for non-conventional *** doubly-curved shell is composed by superimposed generally anisotropic laminae,each of them characterized by an arbitrary *** fundamental governing equations are derived starting from an orthogonal set of principal ***,generalized blending functions account for the distortion of the physical *** implementation of the fundamental governing equations is performed bymeans of the Generalized Differential Quadrature(GDQ)method,whereas the numerical integrations are computed employing theGeneralized IntegralQuadrature(GIQ)*** the post-processing phase,an effective procedure is adopted for the reconstruction of stress and strain through-the-thickness distributions based on the exact fulfillment of three-dimensional equilibrium equations.A series of systematic investigations are performed in which the static response of structures with various curvatures and lamination schemes,calculated by the present methodology,have been successfully compared to those ones obtained fromrefined finite element three-dimensional *** though the present LW approach accounts for a two-dimensional assessment of the structural problem,it is capable of well predicting the three-dimensional response of structures with different characteristics,taking into account a reduced computational cost and pretending to be a valid alternative to widespread numerical implementations.

关键词： Concentrated load doubly-curved shells generalized differential quadrature laminated anisotropic materials layer-wise theory mapping technique

Static Analysis of Doubly-Curved Shell Structures of Smart Materials and Arbitrary Shape Subjected to General Loads Employing Higher Order Theories and Generalized Differential Quadrature Method

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Computer Modeling in Engineering & Sciences 2022年第12期133卷 719-798页

作者： Francesco Tornabene matteo Viscoti Rossana Dimitri Department of Innovation Engineering School of EngineeringUniversity of SalentoLecce73100Italy

The article proposes an Equivalent Single Layer(ESL)formulation for the linear static analysis of arbitrarily-shaped shell structures subjected to general surface loads and boundary conditions.A parametrization of the physical domain is provided by employing a set of curvilinear principal *** generalized blendingmethodology accounts for a distortion of the structure so that disparate geometries can be *** layer of the stacking sequence has an arbitrary orientation and is modelled as a generally anisotropic *** addition,re-entrant auxetic three-dimensional honeycomb cells with soft-core behaviour are considered in the *** unknown variables are described employing a generalized displacement field and pre-determined through-the-thickness functions assessed in a unified ***,a weak assessment of the structural problem accounts for shape functions defined with an isogeometric approach starting fromthe computational *** has been proposed to define two-dimensional distributions of static surface *** the same way,boundary conditions with three-dimensional features are implemented along the shell edges employing linear *** fundamental relations are obtained from the stationary configuration of the total potential energy,and they are numerically tackled by employing the Generalized Differential Quadrature(GDQ)method,accounting for nonuniform computational *** the post-processing stage,an equilibrium-based recovery procedure allows the determination of the three-dimensional dispersion of the kinematic and static *** case studies have been presented,and a successful benchmark of different structural responses has been performed with respect to various refined theories.

关键词： 3D honeycomb anisotropic materials differential quadrature method general loads and constraints higher order theories linear static analysis weak formulation

Characterization of machine tools and measurement system for micromilling

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Nanotechnology and Precision Engineering 2019年第1期2卷 23-28页

作者： Andrea Abeni matteo Lancini Aldo Attansio Department of Mechanical and Industrial Engineering University of Brescia

Technological progress has led to increased demand for small components with tiny features, which cannot be achieved through conventional machining. Industrial application of processes based on microcutting is limited by some issues concerning the geometrical scale. The process performance is significantly affected by milling machine, tool holder, tool, workpiece material microstructure, workpiece fixtures, and process parameters. At present, an ultimate micromachining assessment procedure is not available. This study aims to propose and conduct an experiment on a testing procedure for micromilling. The set up to be implemented and the output to be considered are defined and described. Three major stages are identified: estimation of the effective bandwidth of the load cell–tool holder system, the milling machine natural frequency measurement, and micromilling test execution. The entire procedure is performed, and its robustness is demonstrated.

关键词： Micromilling Machine tool performance test Tool run-out Force analysis Modal analysis

S. V. Kovalevskaya system, its generalization and discretization

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Frontiers of Mathematics in China 2013年第5期8卷 1047-1065页

作者： matteo PETRERA Yuri B. SURIS Institut fiir Mathematik MA 7-2 Technische Universitat Berlin Str. des 17. Juni 13610623 Berlin Germany

We consider an integrable three-dimensional system of ordinary differential equations introduced by S. V. Kovalevskaya in a letter to G. Mittag- Leffler. We prove its isomorphism with the three-dimensional Euler top, and propose two integrable discretizations for it. Then we present an integrable generalization of the Kovalevskaya system, and study the problem of integrable discretization for this generalized system.

关键词： Birational map integrable map algebraically integrable system

Microstructure and Thermal Conductivity of Al–Graphene Composites Fabricated by Powder Metallurgy and Hot Rolling Techniques

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Acta Metallurgica Sinica(English Letters) 2017年第7期30卷 675-687页

作者： Abdollah Saboori matteo Pavese Claudio Badini Paolo Fino Department of Applied Science and Technology Politecnico di Torino Corso Duca degli Abruzzi 24 10129 Turin Italy

The objective of this research is to improve the thermal conductivity and mechanical properties of Al/GNPs（graphene nanoplatelets） nanocomposites produced by classical powder metallurgy and hot rolling techniques. The microstructural evaluation confirmed the uniform dispersion of GNPs at low content and agglomeration at higher contents of GNPs. The structure of graphene was studied before and after the mixing and the Raman spectrum proofs that the wet mixing has a great potential to be used as a dispersion method. There was no significant peak corresponding to the Al_4C_3 formation in both the differential scanning calorimetry curves and X-ray diffraction patterns. The microstructural observation in both fabrication techniques showed grain refinement as a function of the GNPs content. Moreover, the introduction of the GNPs not only improved the Vickers hardness of the composites but also decreased their density. The thermal conductivity investigations showed that in both the press-sintered and hot-rolled samples, although the thermal conductivity of composites was improved at low GNPs contents, it was negatively affected at high GNPs contents.

关键词： Aluminum Graphene Thermal conductivity Powder metallurgy Microstructure

Minimal crystallographic descriptors of sorption properties in hypothetical MOFs and role in sequential learning optimization

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npj Computational Materials 2022年第1期8卷 1154-1167页

作者： Giovanni Trezza Luca Bergamasco matteo Fasano Eliodoro Chiavazzo Department of Energy Politecnico di TorinoC.so Duca degli Abruzzi 24Torino10129Italy

We focus on gas sorption within metal-organic frameworks(MOFs)for energy applications and identify the minimal set of crystallographic descriptors underpinning the most important properties of MOFs for CO_(2)and H_(2)O.A comprehensive comparison of several sequential learning algorithms for MOFs properties optimization is performed and the role played by those descriptors is *** energy transformations,thermodynamic limits of important figures of merit crucially depend on equilibrium properties in a wide range of sorbate coverage values,which is often only partially accessible,hence possibly preventing the computation of desired objective *** propose a fast procedure for optimizing specific energy in a closed sorption energy storage system with only access to a single water Henry coefficient value and to the specific surface *** are thus able to identify hypothetical candidate MOFs that are predicted to outperform state-of-the-art water-sorbent pairs for thermal energy storage applications.

关键词： functions sorption optimization

Reply to "Application of contrast-enhanced intraoperative ultrasonography in the decision-making about hepatocellular carcinoma operation"

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World Journal of Gastroenterology 2010年第30期16卷 3857-3858页

作者： matteo Donadon Guido Torzilli Liver Surgery Unit Third Department of SurgeryUniversity of Milan School of MedicineIRCCS Istituto Clinico HumanitasVia Manzoni 5620089RozzanoMilanItaly

The use of contrast-enhanced intraoperative ultrasound for hepatocellular carcinoma has been already proposed as a novel technique to stage the disease during surgical resection. In the herein presented "letter to the editor", the authors underline some important points, which have been raised following paper published in the January issue of World Journal of Gastroenterology.

关键词： Hepatocellular carcinoma Liver surgery Contrast-enhanced intraoperative ultrasound Cirrhosis

Fatty is not that bad: feeding short-chain fatty acids to restrain autoimmunity

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Cellular & Molecular Immunology 2017年第11期14卷 878-880页

作者： Arianna Brevi matteo Bellone Department of Immunology Transplantation and Infectious DiseasesCellular Immunology UnitSan Raffaele Scientific InstituteMilan 20132Italy Univeristà Vita-Salute San Raffaele Milan 20132Italy

Do environmental cues,and commensal bacteria in particular,have an impact on autoimmunity,and can we modulate the production of gut microbial metabolites to re-equilibrate immune responses as well as restrain autoimmune diseases?Mariño et al.1 elegantly addressed these issues in a very recent Nature Immunology *** report that diets designed to release large amounts of the microbial metabolites acetate and butyrate finely tune autoreactive immune responses,which lends weight to the fascinating hypothesis that medicinal foods and metabolites might contribute to treating autoimmune diseases.

关键词： restrain autoimmunity release

Osteopontin and the immune system:another brick in the wall

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Cellular & Molecular Immunology 2018年第4期15卷 405-407页

作者： Sara Caputo matteo Bellone Cellular Immunology Unit Department of ImmunologyTransplantation and Infectious DiseasesSan Raffaele Scientific Institute20132 MilanItaly

The innate and adaptive arms of the immune system are finely tuned to efficiently react to either endogenous or exogenous noxiae that perturb the function of our tissues and organs,thus rapidly returning to homeostasis with minimal collateral *** molecular mechanisms by which this occurs have been only partially *** work by Kanayama et al.1 contributes to the building of this wall of knowledge by adding an important *** show that osteopontin(OPN),a phosphorylated protein of the extracellular matrix(ECM),has a dominant role in balancing lymphoid and myeloid cells during emergency granulopoiesis(that is,an increased cellular output from the bone marrow to meet the acute demand for the respective blood cell type).2 OPN that is produced and released by bone marrow(BM)stromal cells negatively impacts the pool size of hematopoietic stem cells(that is,Lin−Sca-1+c-kit+).

关键词： organs al. endogenous