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检索条件"丛书名=Lecture Notes in Mechanical Engineering"

共 6719 条记录，以下是161-170 订阅

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Vacuum Technology for Magnesium Alloys During Die Casting of Radiators 6th

Vacuum Technology for Magnesium Alloys During Die Casting of...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Stalnichenko, Oleg Lysenko, Tatiana Ponomarenko, Olga Kreitser, Kyryll Kozishkurt, Evgeny Odesa Natl Maritime Univ 34 Mechnikova St UA-65029 Odesa Ukraine Odesa Polytechn Natl Univ 1 Shevchenko Ave UA-65044 Odesa Ukraine Natl Tech Univ Kharkiv Polytech Inst 2 Kirpichova St UA-61000 Kharkiv Ukraine

ISBN: (纸本)9783031827488;9783031827464;9783031827457

The article considers a new technology of magnesium alloy vacuumization during high-pressure casting. For its creation, the technology of casting magnesium radiators in machines with hot chamber high-pressure pressing was taken as a basic one. Magnesium alloys have high characteristics, one of the main ones being their high thermal conductivity, making them ideal for creating efficient radiators compared to traditional aluminum radiators. However, magnesium's problems, especially its low corrosion resistance, prevent it from being used for such castings. Therefore, improvements in vacuum technology allow the AZ91D magnesium alloy radiator to solve the problems with its corrosion resistance and achieve higher performance than the basic version. Its uniqueness lies in the use of labyrinth air suction from the mold. This solution prevents magnesium from evaporating during vacuuming. Experimental studies demonstrate the high efficiency of the proposed technology, opening new perspectives for mass production. It should also be noted that this vacuumization technology is used as one of the stages of a larger-scale technology of pulsed supply of shielding gases. The combination of these systems allowed to achieve new successes in casting magnesium alloys.

关键词： Magnesium Protection Magnesium Alloys Magnesium Microstructure Magnesium Alloys Vacuuming Heating Radiators

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Numerical and Experimental Study of Flax-Basalt Composites Impact Behaviour 5th

Numerical and Experimental Study of Flax-Basalt Composites I...

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5th International Symposium on Dynamic Response and Failure of Composite Materials

作者： Giammaria, Valentina Ricciardi, Maria Rosaria Papa, Ilaria Lopresto, Valentina Boria, Simonetta Antonucci, Vincenza Univ Camerino Sch Sci & Technol Div Math I-62032 Camerino Italy CNR Inst Polymers Composites & Biomat I-80078 Naples Italy Univ Naples Federico II Dept Chem Mat & Ind Prod Engn I-80125 Naples Italy

ISBN: (纸本)9783031776991;9783031776977;9783031776960

Fiber-reinforced composite materials are usually adopted for transportation applications, where the impact behavior is crucial for vehicle safety and protection. Therefore, since composites are characterized by low toughness and consequent poor damage resistance, several authors have investigated different approaches to improve the impact resistance, such for example the addition of rubber particles to the polymer matrix or the reinforcement hybridization to obtain a new material by exploiting the benefits of all its constituents. Hybridization gives the possibility to realize composites with more balanced and tailored properties by lowering the costs too. In this work, the low-velocity impact behavior of hybrid composites has been numerically and experimentally investigated. In particular, epoxy-based laminates based on only 16 basalt twill, only 16 flax twill, and 16 flax/basalt layers, alternatively stacked have been realized by the vacuum infusion process. Basalt and flax fibers can be both considered green fibers, having the first ones a mineral origin and the second one a natural source. Thus, their adoption combines the impact resistance of basalt fibers and the actual environmental sustainability issues. The experimental results showed the advantage of fiber hybridization and evidenced better impact performances for the hybrid composites than those of pure basalt and pure flax laminates. In addition to the experimental tests, to implement and optimize a predictive tool for the impact resistance behavior of composite laminates, Finite Element (FE) models were developed by using the LS-DYNA solver. The model consisted of 16 shell layers connected by cohesive elements to better reproduce the delamination phenomenon. The boundary conditions applied were the same as for the physical tests. It is known that, in the definition of numerical models, some parameters cannot be experimentally determined or are not available from the tests;therefore, a trial-and-error ap

关键词： Composites Impact Hybridization Numerical Modeling

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Vibration Testing of the Next Generation Civil Tiltrotor Technological Demonstrator Composite Wing 5th

Vibration Testing of the Next Generation Civil Tiltrotor Tec...

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5th International Symposium on Dynamic Response and Failure of Composite Materials

作者： Marano, Aniello Daniele Gagliardi, Giuseppe Maurizio Miano, Mario Belardo, Marika Marulo, Francesco Univ Naples Federico II Dept Ind Engn Via Claudio 21 I-80125 Naples Italy MaGroup Magnaghi Aeronaut Via Galileo Ferraris 76 I-80142 Naples Italy Italian Aerosp Res Ctr CIRA Via Maiorise I-81043 Capua Italy

ISBN: (纸本)9783031776991;9783031776977;9783031776960

The tiltrotor wing structure is one of the most critical and thoroughly investigated components in aircraft design due to the interactions between the wing, pylon, and rotor systems, which are crucial for ensuring aeroelastic stability. In this context, composite materials are essential for meeting structural requirements while also minimizing weight. The reference aircraft for this study is the Next-Generation Civil Tiltrotor Technological Demonstrator (NGCTR-TD), developed by Leonardo Helicopters within the Clean Sky 2 research program. An innovative wing box configuration featuring three spars, including one curved spar, was designed and manufactured. Given the uniqueness of this tailored solution, it is crucial to ensure that the manufactured assembly meets the design requirements. In the field of structural dynamics, experimental modal analysis is essential for determining experimental modal parameters to satisfy these requirements. Several experimental tests on lab-scale demonstrators and incomplete full-scale mockups were conducted to validate the test setup and approach. Finally, preliminary vibration testing activities have been performed on the full-scale test article, thus validating the test setup in view of the final test.

关键词： Composite wing Experimental modal analysis Vibration Testing Tiltrotor

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Effect of Post-treatment Process on the mechanical Properties of 3D Printed Natural Fiber Composite Materials 5th

Effect of Post-treatment Process on the Mechanical Propertie...

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5th International Symposium on Dynamic Response and Failure of Composite Materials

作者： Russo, Marco Russo, Pietro Ricciardi, Maria Rosaria Papa, Ilaria Napolitano, Francesco Lopresto, Valentina Langella, Antonio CNR Inst Polymer Composites & Biomat Piazzale Enrico Fermi 1 I-80055 Portici Italy Inst Polymers Natl Res Council Composites & Biomat Via CampiFlegrei 34 Naples Italy Univ Naples Federico II Dept Chem Mat & Prod Engn P Le Tecchio 80 I-80125 Naples Italy

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Contact Interaction of a Ball with a Toroidal Running Track with a Closely Shaped Power Law Profile 6th

Contact Interaction of a Ball with a Toroidal Running Track ...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Tkachuk, Mykola Grabovskiy, Andriy Tkachuk, Mykola Hrechka, Iryna Tkachuk, Hanna Natl Tech Univ Kharkiv Polytech Inst 2 Kyrpychova St UA-61002 Kharkiv Ukraine

ISBN: (纸本)9783031827488;9783031827464;9783031827457

The influence of the surface shape of contacting bodies on the distribution of contact pressure between them and the stress-strain state of these bodies is studied in the paper. The case study covers contact interaction between a ball piston and a running track of a radial hydro volumetric transmission. The elastostatics problem is reduced to the contact of bodies of revolution: a sphere and a toroid. The profile of the axial section of the toroid is given in the form of a power function defined by two variable parameters. These parameters determine the distribution of contact pressure between these bodies and its magnitude. The regularities of this influence have been established. The dependency of the maximum value of the contact pressure and the equivalent von Mises stresses on varied parameters are established. Constructed parametric contact interaction models make it possible to perform multivariate calculations of the stress-strain state of contacting bodies. Analyzing the obtained results makes it possible to build a specialized research database. In turn, this database is the basis for the justification of project decisions when creating progressive structures, which include complex profile details. Accordingly, rational profiles of contacting bodies are determined according to the strength criterion.

关键词： Contact Interaction Hydrovolumetric Transmission Ball Pistons Surface Shape Contact Pressure Stress-Strain State

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Effect of Water Immersion on mechanical Properties of Epoxy/basalt Fiber Reinforced Composites: New Perspectives 5th

Effect of Water Immersion on Mechanical Properties of Epoxy/...

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5th International Symposium on Dynamic Response and Failure of Composite Materials

作者： Russo, M. Langella, A. Papa, I. Lopresto, V. Antonucci, V. Cigliano, C. Ricciardi, M. R. CNR Inst Polymers Composites & Biomat Portici Italy Univ Naples Federico II Dept Chem Mat & Prod Engn P Le Tecchio 80 I-80125 Naples Italy

ISBN: (纸本)9783031776991;9783031776977;9783031776960

FRPs composites are currently used for several civil, marine and industrial applications due to their interesting specific properties, such as low weight, high stiffness resistance to weight ratio and high chemical resistance. In general, their mechanical performance, especially for conventional composites based on synthetic fibers (i.e. glass or carbon) under common environmental conditions are known to the scientists and engineers. However, there is a lack of knowledge on the mechanical properties and durability of novel composites, based on mineral or natural fibers, exposed to harsh environmental conditions. Among innovative FRPs, basalt-based composites are attracting the attention of researchers as potential substitutes for glass fibers composites, that overcome the corrosion problems of metals and are currently adopted for many marine applications where the water intake can lead to swelling and plasticization of the polymer matrix, fiber/matrix interface deterioration and debonding. In this work, epoxy/basalt twill woven fabric composites have been manufactured by vacuum infusion process and experimentally characterized to investigate the effect of fresh and saline water on their mechanical performance. In particular, to reduce the water absorption, after infusion and curing, the external lower and upper surfaces of composite laminates were covered with polylactic acid (PLA) layers, while an acrylic coating was applied along the cut edges of the samples. Then, both uncoated and coated composites were immersed for 30, 60, and 120 days in freshwater and a proper salt solution at environmental temperature. Five samples of each batch were regularly weighed and used to perform flexural tests.

关键词： Basalt Composites Water aging mechanical Properties

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RF Magnetron Sputtering of Biocompatible Coatings 6th

RF Magnetron Sputtering of Biocompatible Coatings

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Berladir, Khrystyna Hovorun, Tetiana Oleshko, Oleksandr Radchenko, Svetlana Sumy State Univ 116 Kharkivska St UA-40007 Sumy Ukraine Tech Univ Kosice 1 Bayerova St Presov 08001 Slovakia

ISBN: (纸本)9783031827488;9783031827464;9783031827457

The work is devoted to obtaining calcium-phosphate (Ca/P) coatings based on hydroxyapatite using the RF magnetron sputtering method and conducting SEM, TEM, and X-ray structural analysis. It was established that the power of the RF discharge, the bias voltage on the substrate, the working gas atmosphere, and the sputtering time determine the Ca/P ratio in the coating and its structure. Controlling the basic parameters of sputtering, changing the coating structure from amorphous to crystalline components, and improving the ratio of the main elements are possible. The morphology of the formed coatings was studied, and the average grain size was measured. For all types of coatings, rectilinear and curvilinear crystal boundaries were found, which correspond to arbitrary orientations of neighboring blocks. A common feature was the formation of a nano-sized subgranular structure within each columnar crystallite with extinction contours, demonstrating the coating material's highly stressed state. Calcium-phosphate coatings on oxidized and non-oxidized samples of stainless steel and titanium obtained by RF magnetron sputtering of hydroxyapatite targets in various gas environments were characterized by high nanohardness (8.4-11.9 GPa) and elastic recovery (41-52%), which is a favorable factor for implants working under load.

关键词： Coatings RF Magnetron Sputtering Biocompatibility Implant Nanohardness Process Innovation

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Biodegradable Filaments for 3D Printing Filled by Biomass of Mediterranean Area: Processing and Characterisation 5th

Biodegradable Filaments for 3D Printing Filled by Biomass of...

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5th International Symposium on Dynamic Response and Failure of Composite Materials

作者： Ricciardi, M. R. Papa, I. Russo, M. Scaffaro, R. Gammino, M. Langella, A. CNR Inst Polymer Composites & Biomat Piazzale Enrico Fermi 1 I-80055 Portici Italy Univ Naples Federico II Dept Chem Mat & Prod Engn P Tecchio 80 I-80125 Naples Italy Univ Palermo Dept Engn Viale Scienze I-90128 Palermo Italy

ISBN: (纸本)9783031776991;9783031776977;9783031776960

This work is a preliminary study investigating the issues related to the preparation and characterisation of green composites with a biodegradable matrix (PLA) and a natural filler typical of the Mediterranean area, sourced from alien/invasive plants (Chamaerops humilis). Additive manufacturing has been chosen as the primary technique to produce these bio-composites, leveraging its ability to produce complex geometries with precision. The choice of Chamaerops humilis is motivated by the fact that these plants are non-edible and abundant in the Mediterranean area, aligning with the new design guidelines inspired by the circular economy and "zero waste" principles. This paves the way for the creation of a new generation of green and sustainable materials. Using this plant as a filler for green composites is expected to enable the biodegradation of the composites in marine environments while providing remarkable mechanical properties. Starting from the selected materials, filaments will be manufactured for 3D printing components made of polymeric material with different filler percentages (10% wt and 20% wt). mechanical and chemical-physical analyses will be conducted to evaluate the process parameters and assess their printability. The effect of fillers and their different percentages on the mechanical performance of the filaments will also be evaluated.

关键词： Bio-composite Additive manufacturing Natural filler Thermomechanical analysis Material characterization

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The Effect of Implant Parameters on Primary Stability of Transhumeral Osseointegrated Implant 4th

The Effect of Implant Parameters on Primary Stability of Tra...

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4th International Conference of the Italian Association of Design Methods and Tools for Industrial engineering

作者： Cirello, Antonino Ingrassia, Tommaso Marannano, Giuseppe Mirulla, Agostino Igor Nigrelli, Vincenzo Valenti, Andrea Univ Palermo Dept Engn Viale Sci 8 I-90128 Palermo Italy

ISBN: (纸本)9783031765933;9783031765940

The use of osseointegrated implants as a solution for amputation treatment, providing a stable connection between the stump and prosthetic limb, is expanding its application to different anatomical districts. A particular focus is put on upper limb amputations, where socket-suspended systems often lead to high abandonment rates of prostheses and osseointegrated implants can enhance prosthetic-limb use, and improve bone perception and range of motion, leading to a better quality of life. This study aims to evaluate the effect of bone-implant interference and implant length of a straight implant, on the primary stability of a humerus CAD model through finite element analysis. The results suggest that a compromise can be made between interference and length to accommodate varying bone morphology and stump length. Additionally, the study results may suggest re-evaluating the prescribed weight limits for transhumeral implants based on their actual load-bearing capacity. Comparison with existing literature underscores the relevance of the study's optimizing design parameters for improved clinical outcomes.

关键词： osseointegration primary stability finite element method

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Method for Variation of Deformations and Stress Under Natural Vibrations 6th

Method for Variation of Deformations and Stress Under Natura...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Pokhlebina, Taisiia Lymarenko, Oleksandr Balaniuk, Anna Bazhanova, Anastasia Khamray, Vadim State Univ Intelligent Technol & Telecommun 1 Kuznechna St UA-65023 Odesa Ukraine Odesa Polytech Natl Univ 1 Shevchenko Ave UA-65044 Odesa Ukraine

ISBN: (纸本)9783031827488;9783031827464;9783031827457

A feature of testing complex products is that there are a lot of points for measurements - strain gauges. Multichannel strain gauges and an information-measuring system for strength tests are used for these purposes. This paper explores the method of penalty functions. In those problems where many local solutions are assumed, different versions of existing calculation methods can be used to find the scale minimum of the functional. The expediency of using such options is explained by the fact that the problem being solved is nonlinear. It has been established that if the objective function is continuous, and the allowed area of restrictions forms a closed set, then this will not be enough to determine the optimal parameters when designing machine parts. All parameter values of complex loaded parts, presented as constraints, are divided into sections and intervals. In this case, the interval corresponds to the corresponding segment. When considering a nonlinear system of constraints, the method of penalty functions should be applied. The paper proposes a method for finding the optimal parameters of complex components under load. The study proposes an option for determining the direction of the main axes of the so-called strain tensor, principal strains, and stresses by determining the strains in parts with complex loading.

关键词： Deformation Stress Complex Load Parts Strain Gauges Full-Scale Experiment Method of Penalty Functions

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