Letteratura scientifica selezionata sul tema "On-Demand mechanical properties"
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Articoli di riviste sul tema "On-Demand mechanical properties":
1
Hippie, Jack. "Invention on Demand". Mechanical Engineering 127, n. 11 (1 novembre 2005): 36–37. http://dx.doi.org/10.1115/1.2005-nov-3.
Abstract (sommario):
This article reviews a system that lays down tools for creative problem-solving and product-design. Altshuller identified a number of inventive principles and also discerned patterns of technological evolution. He regarded these ideas as generic principles that could be used not only to solve problems in product design, but also to forecast and plan product and business development. As people have continued to study the patent literature, they do not find much in the way of any new inventive principles, and the ratio of really breakthrough patents continues at less than 5 percent. Theory of Solving Inventive Problems (TRIZ) began to migrate to the West after perestroika, partly because many of its proponents in the Soviet Union were frustrated at not being able to implement their technology in the private sector. Systems and products become more dynamic over time. Systems evolve by the matching and mismatching of components and properties.
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Kozibaevich, Mirzaev Bahodir. "THE EFFECT OF ADDITIVES THAT ACCELERATE SOLIDIFICATION ON THE MAIN PROPERTIES OF FOAM CONCRETE: CHANGES IN PHYSICAL AND MECHANICAL PROPERTIES". International Journal of Advance Scientific Research 02, n. 11 (1 novembre 2022): 67–76. http://dx.doi.org/10.37547/ijasr-02-11-10.
Abstract (sommario):
At a time when the demand for heat-insulating materials is increasing every year, the production of composite materials with high efficiency based on local and industrial waste can be one of the solutions to this problem. One type of these materials is foam concrete. Use of energy-efficient construction materials, production of wall coverings and heat-insulating products from them. The article considers the issues of improving the main properties of foam concrete under the influence of additives that accelerate the hardening process of foam concrete produced based on local raw materials. The correlation of porosity with mechanical strength was studied. It has been shown that the strength varies significantly when different materials are compressed in a solid fractional volume.
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Džugan, Jan, Martina Maresova e Pavel Podany. "Dynamic Mechanical Properties of Sugarcane". Advanced Materials Research 811 (settembre 2013): 314–18. http://dx.doi.org/10.4028/www.scientific.net/amr.811.314.
Abstract (sommario):
New design of a sugarcane shredder is being performed within a research project. This kind of equipment used to be traditionally designed on the basis experiences up to recent time. With increasing demand for the material economic utilization and reliable service, new material optimized design of shredders is required. In order to be able to perform qualified design and material optimization, service conditions has to be known. The paper is dealing with determination of sugarcane mechanical properties under dynamic loading, as the shredding process is performed at high velocities in the range of several meters per second. The mechanical properties of the sugarcane are going to be subsequently used for calculation of in operation loading on shredder components in the further steps.
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Zhou, Jianwei, Baoying Yu, Yaning Kong, Wen Yang e Baojun Cheng. "Effect of Limestone Powder on Mechanical Properties of Engineering Cementitious Composites". Journal of Physics: Conference Series 2076, n. 1 (1 novembre 2021): 012082. http://dx.doi.org/10.1088/1742-6596/2076/1/012082.
Abstract (sommario):
Abstract The effect of limestone powder replacing fly ash on the mechanical properties of engineering cementitious composites was investigated. The results showed that the water demand of engineering cementitious composites due to partial replacement of fly ash by limestone powder, but the water demand of the system decreased when the replacement ratio reached 100%. The flexural strength of the specimen appears to decrease with increasing age due to incomplete replacement of lime powder. The toughness of the specimen can be significantly improved due to the complete replacement of fly ash by limestone powder.
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Qadr, Hiwa Mohammad, e Ari Maghdid Hamad. "Mechanical Properties of Ferritic Martenstic Steels: A Review". Scientific Bulletin of Valahia University - Materials and Mechanics 17, n. 16 (1 maggio 2019): 18–27. http://dx.doi.org/10.2478/bsmm-2019-0003.
Abstract (sommario):
Abstract The word-wide demand for energy is constantly increasing, and therefore ideas around future energy-generation are also on the increase with the aim of meeting this demand. This includes designs for the next generation of nuclear power reactors, such as gas-cooled, liquid-metal-cooled and water-cooled reactors; the goal being to create smarter ways to produce more economical, environmentally-friendly energy. The conditions such reactors would need to meet, present significant design challenges for scientist and engineers, not least around the structural materials and components to use. Depending on the operational conditions, use of elevated- temperature ferritic/martensitic materials such as P91 and P92 steel are favoured by several of the designs for use with out-of-core and in-core applications. The main goal behind this review article is to explain mechanical properties of P91 and P92 steel; these are two types of ferritic/martensitic steels. This reviewer, highlight and discuss the development of ferritic/martenisitc steels for nuclear programmes and to explain the effect of irradiation on mechanical properties of P91 and P92.
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Velkushanova, Konstantina V., Lungi Zuma e Chris Buckley. "Mechanical properties of faecal sludge". Gates Open Research 3 (17 ottobre 2019): 1582. http://dx.doi.org/10.12688/gatesopenres.13049.1.
Abstract (sommario):
On-site sanitation facilities contribute to the majority of toilet facilities in developing countries as full waterborne sanitation is not feasible or affordable. The characteristics of faecal sludge vary greatly between different locations and types of onsite sanitation facilities and at the same time their understanding is crucial for improvement of the existing faecal sludge management services. The Pollution Research Group (PRG), within the School of Chemical Engineering in the University of Kwa-Zulu Natal have been focussing on the analysis of faecal sludge from different on-site sanitation, such as urine diversion and dehydration toilets, wet and dry ventilated improved pit latrines at household and community levels and unimproved pit latrines. This study was undertaken between 2012 and 2014 and focussed on the characteristics of faecal sludge obtained from different on-site sanitation facilities in the Durban metro area in South Africa. Sampling methods were developed and applied for different depth levels of the pits for each on-site sanitation facility. The analysis followed the PRG standard operation procedures for properties such as: moisture content, total solids, ash content, pH, chemical oxygen demand, density, nutrient contents and thermal properties.
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Souto, André, Jian Zhang, Alejandro M. Aragón, Krassimir P. Velikov e Corentin Coulais. "Edible mechanical metamaterials with designed fracture for mouthfeel control". Soft Matter 18, n. 15 (2022): 2910–19. http://dx.doi.org/10.1039/d1sm01761f.
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De Smet, David, e Myriam Vanneste. "Design of Debondable PU Coating for Degradation on Demand". Coatings 14, n. 6 (7 giugno 2024): 731. http://dx.doi.org/10.3390/coatings14060731.
Abstract (sommario):
Polyurethane (PU) coatings are applied on technical textiles for their superior properties. Up to now, PU-coated textiles are not recycled at end of life. Landfilling is still the most occurring way of processing PU waste. Next to looking to sustainable routes for processing PU waste, there is the drive towards bio-based polymers. With this regard, a bio-based trigger degradable PU coating specifically designed for textiles was developed. The PU was characterized via FT-IR, TGA, and DSC. The performance of the coating was assessed by examining the mechanical properties and the resistance to hydrostatic pressure initially and after washing. The developed bio-based PU coatings had a high tensile strength, were waterproof, and had excellent wash fastness at 40 °C. The coating could be easily debonded from the textile by immersion in a tetra-n-butylammoniumfluoride solution. FT-IR and microscopic analysis indicated that the coating was completely removed and that the polyester fabric was not degraded.
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Hidayati, Fanny, Sri Sunarti, Teguh Setiaji e Arif Nirsatmanto. "SIFAT FISIKA DAN MEKANIKA KAYU JABON MERAH (Anthocephalus macrophyllus) YANG DITANAM DI WONOGIRI, 2 JAWA TENGAH". Jurnal Hutan Tropis 8, n. 3 (15 dicembre 2020): 357. http://dx.doi.org/10.20527/jht.v8i3.9739.
Abstract (sommario):
Red jabon is one of the fast growing species. It is growth well in tropical countries. It has a potential to fulfill the demand of wood. Tree imrovement program of this species has been done in Indonesia. However, information of wood properties related to tree improvement program of red jabon is limited. Therefore, wood properties such as physical and mechanical properties of this species at the progeny trial were needed to clarify. The aims of this research were to clarify the variation of physical and mechanical properties of red jabon from 5 families at5-year-old planted in Wonogiri, Central Java and relationship between air-dry density and mechanical properties. As the result, physical and mechanical properties were varied among 5 families. Based on the results, famili number 85 performed good result of physical and mechanical characteristics, eventhough the physical properties were not highest among 5 families but it was abouf the average value. Furthermore, this family showed the best values of all mechanichal characteristics tested. In addition, air-dry density has highly positive significantcorrelation with mechanical properties (static bending strength and compressive strength parallel to grain), suggesting that mechanical properties can be predicted by air-dried density.
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Ramadji, Christian, Adamah Messan e Elodie Prud’Homme. "Influence of Granite Powder on Physico-Mechanical and Durability Properties of Mortar". Materials 13, n. 23 (27 novembre 2020): 5406. http://dx.doi.org/10.3390/ma13235406.
Abstract (sommario):
This study explored the pozzolanic reactivity of granite powder (GP) and its influence on the microstructure of cement paste. An analysis of the physical properties (water demand, setting time, heat of hydration and total shrinkage), compressive strength and durability indicators (water absorption, porosity, acid attack and chloride ions diffusion) was carried out on mortar containing 10%, 15% and 20% of GP as partial substitution to cement (CEM I 42.5 R) in the short and long term. The results showed that the GP does not exhibit pozzolanic reactivity and that it reduces the heat of hydration. Water demand and setting time were not affected by the GP. The compressive strength decreases with increasing the content of GP; but in the long term, the compressive strength was not affected for 10% GP substitution. The presence of granite powder in mortar induces an increase in porosity, which led to an increase in the diffusion properties of fluids (capillary water absorption and chloride ions diffusion).
Tesi sul tema "On-Demand mechanical properties":
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Cheikho, Karim. "Conception de structures souples élastiques et applications en biomécanique". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0147.
Abstract (sommario):
La sélection d’une matrice poreuse la plus adaptée à la régénération tissulaire pour une application clinique donnée est un défi, qui a motivée de nombreuses études en particulier pour des applications au comblement osseux. Plusieurs propositions ont été proposés au cours de la dernière décennie, y compris des structures avec des gradients de taille de pores dont il a été prouvé qu’elles facilitaient le transport des nutriments de la périphérie au cœur de la matrice poreuse, et encourageaient donc la régénération tissulaire. Le cadre utilisé pour concevoir de telles matrices poreuses à gradients est limité par les possibilités de distribution des pores et l’étendue des propriétés mécaniques qu’il est possible d’atteindre. Dans ce travail, nous avons proposé un cadre de conception pour générer diverses structures de matrices poreuses tridimensionnelles dotées de gradients de taille de pores à partir de transformations appliquées à des cellules unitaires. Nous avons proposé une méthodologie pour générer des matrices poreuses par une répétition multicouche de sections transverses circulaires, ce qui a permis d'obtenir une anisotropie ajustable en fonction de l'application clinique visée. Nous avons identifié les propriétés mécaniques apparentes de différentes configurations de matrices poreuses à l'aide d'une méthode numérique originale, soulignant la polyvalence de la procédure de conception qui permet d’ajuster séparément les propriétés mécaniques longitudinales et transversales des matrices poreuses. Afin d'étudier la capacité des techniques de fabrications additives usuelles à fabriquer les structures proposées, nous avons élaboré des structures poreuses à l'aide de la technique DFF (dépôt de filaments fondus) et SLA (stéréolithographie), et nous avons réalisés des essais mécaniques expérimentaux pour les confronter aux prédictions issues des simulations. Malgré les différences géométriques observées entre la conception initiale et les structures réellement obtenues, les propriétés apparentes des structures issues de la technique SLA concordent avec celles prédites par la méthode de calcul proposée. Des perspectives prometteuses ont été proposées concernant la conception de matrices poreuses auto-adaptables utilisables pour des applications spécifiques, notamment pour le comblement osseux dans un contexte de chirurgie mini-invasiveThe selection of the most-suitable porous bone scaffold for regenerative medicine applied to a given clinical application is challenging, which has motivated numerous studies especially for the repair of bone defects. Several designs have been proposed over the last decade, including structures with pore size gradients that have been proved to facilitate nutrient transport from the periphery to the core of the scaffold, and therefore to enhance tissue regeneration. The framework used to design such porous scaffolds with pore size gradients is limited by the range of the reachable pore distribution and mechanical properties.In this work, we presented a design framework to generate various three-dimensional porous scaffolds structures including cylindrical graded scaffolds from the transformations of unit cells. We proposed a methodology to generate porous scaffolds by multilayer repetition of circular cross sections, resulting in tunable anisotropy depending on the intended clinical application. We identified the apparent mechanical properties of different porous scaffold configurations using an original numerical method, highlighting the versatility of the design procedure that allows for separate tuning of longitudinal and transverse mechanical properties of porous scaffold.In order to investigate the ability of common additive manufacturing techniques to fabricate the proposed structures, we have elaborated scaffolds using FDM (fused deposition modeling) and SLA (stereolithography) techniques, we have performed experimental mechanical tests to be confronted to the predictions issued from simulations. In spite of the geometrical differences observed between the initial design and the obtained structures, the apparent properties of the structures obtained by the SLA technique agree with those predicted by the proposed computational method.Promising perspectives have been proposed concerning the design of self-fitting scaffolds that can be used for clinical applications, particularly to repair bone defects using mini-invasive surgery
Libri sul tema "On-Demand mechanical properties":
1
Günther, Hans-Peter, a cura di. Use and Application of High-Performance Steels for Steel Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2005. http://dx.doi.org/10.2749/sed008.
Abstract (sommario):
<p>New steel production processes have led to a remarkable improvement in steel products within the last few years, and now allows steels to be produced according to the desired mechanical and chemical properties. High-Performance Steel (HPS) is the designation given to this new generation of steels that offer higher performance not only in terms of strength but also toughness, weldability, cold formability and corrosion resistance, compared to the traditionally used mild steel grades.</p> <p>The development of HPS goes with today's increased demand for slender lightweight structures, as for example in bridge design and the design of high-rise buildings, where there is a strong requirement to use high-strength materials in combination with good execution and fabrication properties. However, on the structural engineering side there is a need for knowledge on these new steel grades, and quite often design codes do not provide sufficient information to fully exploit the advantageous properties of HPS.</p> <p>The present volume provides an overview of the development and application of HPS on an international level. This is done by giving information on, for example, the production process, the chemical and mechanical properties, the relevant design and fabrication standards and on recent research results. Approximately fifteen included examples of realised applications aim to provide detailed information based on existing technical solutions, and to point out the major benefits when using HPS in comparison to mild steels.</p> <p>The document is thus not a monograph but an assembly of contributions from different countries. lt is separated into chapters related to different countries, namely the USA, Canada, Japan and Europe, all of them providing a state-of-the-art report on HPS.</p>
2
Succi, Sauro. Flows at Moderate Reynolds Numbers. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199592357.003.0018.
Abstract (sommario):
This chapter presents the application of LBE to flows at moderate Reynolds numbers, typically hundreds to thousands. This is an important area of theoretical and applied fluid mechanics, one that relates, for instance, to the onset of nonlinear instabilities and their effects on the transport properties of the unsteady flow configuration. The regime of Reynolds numbers at which these instabilities take place is usually not very high, of the order of thousands, hence basically within reach of present day computer capabilities. Nonetheless, following the full evolution of these transitional flows requires very long-time integrations with short time-steps, which command substantial computational power. Therefore, efficient numerical methods are in great demand. Also of major interest are steady-state or pulsatile flows at moderate Reynolds numbers in complex geometries, such as they occur, for instance, in hemodynamic applications. The application of LBE to such flows will also briefly be mentioned
Capitoli di libri sul tema "On-Demand mechanical properties":
1
Utsunomiya, Hiroshi, Daisuke Taniguchi, Jyoji Miyamoto e Ryo Matsumoto. "On-Demand Fabrication of Composites with Prescribed Properties by Multifilament Cold Extrusion". In Lecture Notes in Mechanical Engineering, 491–99. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-41023-9_50.
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Rohde-Tibitanzl, Melanie. "Influences on Material Properties in Direct Processing". In Direct Processing of Long Fiber Reinforced Thermoplastic Composites and their Mechanical Behavior under Static and Dynamic Load (Print-on-Demand), 89–130. München: Carl Hanser Verlag GmbH & Co. KG, 2015. http://dx.doi.org/10.3139/9781569906309.005.
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Plumed, Alejandro, David Ranz, Ramón Miralbes e Gustavo Vargas. "Enhanced Material-Driven Design Methodology: Luffa Cylindrica’s Case". In Lecture Notes in Mechanical Engineering, 182–87. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_29.
Abstract (sommario):
AbstractAs society and regulations demand more ecological materials, we must focus on finding new properties in potential candidates that make them really feasible and open up new possibilities. A new methodology is established to reach that goal, based on already existing ones, but with a broader vision; more focused on the use, and not solely on the product. To put it into practice, it’s been applied on Luffa Cylindrica, a plant with interesting properties. A volumetric, mechanical and perceptual characterization of it has been carried out, so that we can create new concepts specially linked to that. One of these paths has been fully developed to the point of getting a physical prototype, while more complex ones have been suggested. The stated methodology may be used as a flexible guide to find new materials not only more environmentally-friendly, but better than what’s stablished.
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Rohde-Tibitanzl, Melanie. "Influence of Fiber Length on Composite Properties Under Static Load". In Direct Processing of Long Fiber Reinforced Thermoplastic Composites and their Mechanical Behavior under Static and Dynamic Load (Print-on-Demand), 131–55. München: Carl Hanser Verlag GmbH & Co. KG, 2015. http://dx.doi.org/10.3139/9781569906309.006.
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Rohde-Tibitanzl, Melanie. "Influence of Fiber Length on Composite Properties Under Fatigue Load". In Direct Processing of Long Fiber Reinforced Thermoplastic Composites and their Mechanical Behavior under Static and Dynamic Load (Print-on-Demand), 156–86. München: Carl Hanser Verlag GmbH & Co. KG, 2015. http://dx.doi.org/10.3139/9781569906309.007.
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Shilko, Evgeny V., Alexey Yu Smolin, Andrey V. Dimaki e Galina M. Eremina. "Particle-Based Approach for Simulation of Nonlinear Material Behavior in Contact Zones". In Springer Tracts in Mechanical Engineering, 67–89. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_4.
Abstract (sommario):
AbstractMethods of particles are now recognized as an effective tool for numerical modeling of dynamic mechanical and coupled processes in solids and liquids. This chapter is devoted to a brief review of recent advances in the development of the popular particle-based discrete element method (DEM). DEM is conventionally considered as a highly specialized technique for modeling the flow of granular media and the fracture of brittle materials at micro- and mesoscopic scales. However, in the last decade, great progress has been made in the development of the formalism of this method. It is largely associated with the works of the scientific group of Professor S. G. Psakhie. The most important achievement of this group is a generalized formulation of the method of homogeneously deformable discrete elements. In the chapter, we describe keystones of this implementation of DEM and a universal approach that allows one to apply various rheological models of materials (including coupled models of porous fluid-saturated solids) to a discrete element. The new formalism makes possible qualitative expansion of the scope of application of the particle-based discrete element technique to materials with various rheological properties and to the range of considered scales form microscopic to macroscopic. The capabilities of this method are especially in demand in the study of the features of contact interaction of materials. To demonstrate these capabilities, we briefly review two recent applications concerning (a) the effect of adhesive interaction on the regime of wear of surface asperities under tangential contact of bodies and (b) the nonmonotonic dependence of the stress concentration in the neck of the human femur on the dynamics of hip joint contact loading.
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Kumar, D., M. Alam e J. Sanjayan. "A Novel Concrete Mix Design Methodology". In Lecture Notes in Civil Engineering, 457–68. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_46.
Abstract (sommario):
AbstractConcrete mix design is the methodology for mixing binder, aggregate and water to achieve required physical, mechanical, and thermal properties. In particular, the physical properties depend on the volume fraction of each element in the concrete recipe. In this study we considered cement mortar, complying with ASTM C105, as the reference concrete with cement as the binder and silica sand as the aggregate. The reference mortar was denser with high thermal conductivity and compressive strength at given rheological properties. A denser concrete presents difficulty in material handling and imposes a safety risk, and high thermal conductivity increases building energy consumption. Therefore, lightweight concrete (LWC) has been developed by replacing silica sand with porous materials. LWC includes cement as the binder, with silica sand and other porous materials as the primary and binary fillers. The mass of the filler materials is determined by their particle density and volume fraction. LWC has low thermal mass, thereby exacerbating the summertime overheating and peak cooling demand of buildings. Therefore, there is a need to design a LWC with high thermal mass by incorporating phase change materials (PCM), which are mainly incorporated as tertiary filler. Here, we propose a novel concrete mix design methodology to incorporate PCM composite as a partial replacement of the porous material without changing binding materials.
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Cao, J., N. Gowripalan, V. Sirivivatnanon e J. Nairn. "Investigation of ASR Effects on the Load-Carrying Capacity of Reinforced Concrete Elements by Ultra-Accelerated Laboratory Test". In Lecture Notes in Civil Engineering, 43–52. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_7.
Abstract (sommario):
AbstractThe alkali–silica reaction (ASR) can cause expansion, cracking, and degradation of the mechanical properties of affected concrete. Concerns about the safety of ASR-damaged reinforced concrete structures have driven the demand for studying the effects of ASR on residual load capacity of the deteriorated structure. Conventionally, field load testing methods are used to assess the residual load capacity of ASR-affected structures. In this study, a novel accelerated laboratory test using the LVSA 50/70 autoclave to accelerate ASR was applied to investigate the flexural and shear behavior of small-scale reinforced concrete beams affected by ASR. The specimens were subjected to three cycles of 80 °C steam curing at atmospheric pressure in the autoclave, with 60 h/cycle. Significant expansion and ASR damage were observed. Load carrying capacity tests on the small-scale reinforced concrete beams showed that, at the expansion levels achieved, the flexural capacity of the reinforced concrete beams was not significantly affected. Shear resistance of the reinforced concrete beams, however, was found to increase compared with their 28-day counterparts, which could be attributed to the prestressing effect due to ASR expansion. It appears that the multicycle 80 °C steam-curing autoclave test is suitable for investigating ASR deterioration of actual concrete mixes within a short period of time. ASR effects on the load carrying capacity of reinforced concrete elements at higher expansion levels, however, need further investigation.
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Bock-Seefeld, Benjamin, Patrick Gehre e Christos G. Aneziris. "Carbon-Bonded Filter Materials and Filter Structures with Active and Reactive Functional Pores for Steel Melt Filtration". In Multifunctional Ceramic Filter Systems for Metal Melt Filtration, 1–25. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-40930-1_1.
Abstract (sommario):
AbstractThere exists an increasing pressure on the metal making and metal using industry to remove solid and liquid inclusions such as deoxidation products, sulfides, nitrides carbides etc. and thereby improve metal cleanliness. It is well known that size, type and distribution of non-metallic inclusions in metal exert considerable effects on the mechanical properties of the cast products. In terms of this contribution a new generation of metal qualities via melt filtration with superior mechanical properties for use in light weight structures and high demand construction materials are explored. The main target is an enormous reduction of non-metallic inclusions in the metal matrix by the use of intelligent filter materials as well as filter systems with a functionalized filter surface. Especially a new generation of combined refining filter systems will be illustrated. The metal melt comes first in contact with a reactive filter which generates gas bubbles in the melt as well as activates gas bubbles on the surface of the inclusions. As a result, a kind of flotation of the inclusions towards the slag on the surface of the melt takes place. Further the high reactivity as well as the gas bubbles contribute to the agglomeration of the fine inclusions to big clusters which flow due to buoyancy forces to the surface of the melt or are filtrated on the surface of active filters, which do not form gas bubbles but provide on their functionalized surfaces the same chemistry as the inclusions for a sufficient adhesion and as a result for a sufficient filtration of the inclusions. With this approach a purification higher than 95% can be achieved. Another topic is dealing with carbon-bonded filter materials based on environmentally friendly binder system based on lactose and tannin. Furthermore, functional calcium aluminate coatings in combination with carbon are studied with regard to their impact on the active/reactive filtration and flotation in steel melts, respectively. Another major focus is the investigation of water-soluble filter skeleton-templates, which are produced by 3D-hybrid-printing techniques and coated by flame spraying technology. Subsequently, the filter skeleton-templates are removed in water, avoiding sharp-edged cavities inside the filter.
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Kumar, Manjeet, Rajesh Kumar, Sandeep Kumar e Chander Prakash. "Biomechanical Properties of Orthopedic and Dental Implants". In Handbook of Research on Green Engineering Techniques for Modern Manufacturing, 1–13. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5445-5.ch001.
Abstract (sommario):
The demand for the orthopedic and dental implants has increased sharply in last decade due to physical traumas and age-related deficiencies. The material used for orthopedic and dental implants should be biocompatible to ensure the adaptability of the implant in the human body. The mechanical stability of implants is dependent on mechanical properties and surface characteristics essential to ensure corrosion and wear resistance. The requirement of mechanical properties also differs substantially from load-bearing to non-load-bearing implants. There are many problems arising due to lack of sufficient biocompatibility, like infection, poor osseointegration, and excessive foreign body response. Fatigue failure, stress shielding, and bone resorption are some major problems associated with lack of mechanical stability. Numerous conventional materials, coatings, and nanomaterials have been used to enhance the implant stability.
Atti di convegni sul tema "On-Demand mechanical properties":
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Kagerer, Markus, Arne Meeuw, Jan Berger, Dominik Rumschoettel, Tim C. Lueth e Franz Irlinger. "Relevant Influencing Factors on Droplet Characteristics for a Piezoelectrically Driven Drop-on-Demand Printhead". In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36199.
Abstract (sommario):
Dispensing minute amounts of fluid is used in many industries, such as in life science, bioengineering, 3D printing, or in electronics manufacturing. Each application for drop-on-demand (DoD) printheads requires different drop volumes and drop velocities. Furthermore, it is necessary to eject droplets made of fluids with different fluid properties, like viscosity, surface tension, or density. Due to this wide range of different applications and demands on printheads it is important to investigate the influence of relevant factors on the droplet formation process. Therefore, the influence of the fluid properties, the printhead geometry, and the electrical excitation form on the droplet formation process are described in this project. In detail, the influence of the surface tension as well as the viscosity of the fluid, the nozzle length and its width, and the amplitude of the applied voltage at different pulse widths on the droplet characteristics are investigated. The used printhead consists of a silicon chip, which includes the fluidic components, and of a bimorph piezoelectric actuator. The printhead is manufactured with rapid manufacturing techniques, such as laser micromachining. The advantage of this method is that the printhead is adaptable to new boundary conditions in a time- and cost-saving manner. In this project, the nozzles have a square shape with a sidelength between 50 and 100 μm and the nozzle length varies between 50 and 200 μm. A fluid mixture is provided which can be varied in its fluid properties. Therefore, the possibility for the independent adjustment of its viscosity and its surface tension is given. The mixture consists of glycerin, distilled water, and isopropanol. An analytical description for each amount of its substances enables to provide a fluid with defined properties. Three kinds of experiments are carried out in order to determine the influence of the fluid properties, the printhead geometry, and the electrical excitation on the droplet formation process. The determination of the minimum excitation voltage needed for droplet ejection and the determination of the droplet volume and its velocity. The main results are: The higher the surface tension, viscosity, and nozzle length, the higher is the minimum excitation voltage. Furthermore, the droplet velocity decreases for an increased surface tension, viscosity, and nozzle length. On the other hand, the droplet velocity increases with an enlarged amplitude of the voltage and pulse width. The droplet volume increases for an increased surface tension, nozzle width, pulse width, and amplitude of the voltage. In general, the reasons for these correlations are the interaction between the strength of the pressure pulse, friction forces, fluidic resistances, and fluid properties. Overall, the possibility to achieve microdroplets made of different fluids and with a specific velocity and volume is described. Furthermore, a fluid mixture, which can be varied in its fluid properties, is presented.
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Xu, Tao, Catalin Baicu, Brian Manley, Michael Zile e Thomas Boland. "A Finite Element Model for Drop-on-Demand Printing of Designer Hybrid Cardiovascular Constructs". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79082.
Abstract (sommario):
A Finite element model (FEM) was constructed and used to predict the mechanical properties of hybrid cardiovascular tissue engineering constructs. The model allows implementing 3D structures with desired porosities, mechanical and chemical properties. CAD models where designed using the FEM, with mechanical properties matching those of cardiac tissue. Contractile cardiac hybrids have been fabricated by arranging alternate layers of hydrogels and mammalian cardiovascular cells according to these CAD models using inkjet printers. Alginate hydrogels with controlled microshell structures were built by spraying cross-linkers onto ungelled alginic acid using inkjet printers. Cells were seen to attach to the inside of these microshells. The cells remained viable in constructs as thick as 1 cm due to the programmed porosity. Microscopic and macroscopic contractile function of cardiomyocytes sheets was observed in vitro. These results suggest that the printing method could be used for hierarchical design of functional cardiac patches, balanced with porosity for mass transport and structural support.
3
Hukle, Martin, Brian Newbury, Dan Lillig, Jonathan Regina e Agnes Marie Horn. "Effects of Aging on the Mechanical Properties of Pipeline Steels". In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57874.
Abstract (sommario):
The intelligent design of a given pipeline system intended for operation beyond the elastic limit should incorporate specific features into both the base material (line pipe) and girth weld that enable the affected system to deform safely into the plastic regime within the intended strain demand limits. The current paper focuses on the mechanical properties known to influence the strain capacity of the base material (i.e., line pipe steel independent of the girth weld). Line pipe mechanical properties of interest include: longitudinal yield strength, tensile strength, yield to tensile strength ratio, reduction of area, elongation and uniform elongation. Of particular interest (in consideration of the conventional thermally applied corrosion protection coating systems to be employed), are the longitudinal mechanical properties in the “aged” condition. The present study investigates six (6) different pipeline steels encompassing grades X60 (415 MPa) to X100 (690 MPa), and includes both UOE Submerged Arc Welded - Longitudinal (SAW-L) and seamless (SMLS) forming methods.
4
Jiang, Huicong, e Hua Tan. "One Dimensional Simulation of Droplet Ejection of Drop-on-Demand Inkjet". In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71190.
Abstract (sommario):
In this study, we present a 1D method to predict the droplet ejection of a drop-on-demand (DoD) inkjet which includes the drop breakup, coalescence, and the meniscus movement at nozzle orifice. A simplified 1D slender-jet analysis based on the lubrication approximation is used to study the drop breakup. In this model, the free-surface (liquid-air interface) is represented by a shape function so that the full Navier-Stokes (NS) equations can be linearized into a set of simple partial differential equations (PDEs) which are solved by method of lines (MOL). The shape-preserving piecewise cubic interpolation and third-order polynomial curve are employed to merge approaching droplets smoothly. The printhead is simplified into a circular tube, and a 2D axisymmetric unsteady Poiseuille flow model is adopted to acquire the relationship between the time-dependent driving pressure and velocity profile of the meniscus. Drop breakup and meniscus movement are coupled together by a threshold of meniscus extension to complete a full simulation of droplet ejection. These algorithms and simulations are carried out using MATLAB code. The result is compared with a high fidelity 2D simulation which was previously developed [10], and good agreement is found. This demonstrates that the proposed method enables rapid parametric analysis of DoD inkjet droplet ejection as a function of nozzle dimensions, driving pressure and fluid properties.
5
Sanchaniya, Jaymin-Vrajlal, Sai-Pavan Kanukuntla e Kagan-Berkay Senyurt. "Fabrication and mechanical properties of polymer composite nanofiber mats". In 22nd International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, Faculty of Engineering, 2023. http://dx.doi.org/10.22616/erdev.2023.22.tf014.
Abstract (sommario):
In recent years, as microelectronics technology advances, the number of miniature devices has increased as well as the demand for power supply. Polymer-based electrospun nanofiber membranes have been used as lithium-ion (LI) battery separators and filtration medium. This study investigates the mechanical properties of orientated polyamide 6 (PA6) and polyacrylonitrile (PAN) nanofiber mats prepared by electrospinning a solution containing PAN and PA6, separately. The PA6 granules and the PAN powder were dissolved in formic acid solvent and N, N-dimethylformamide solvent, respectively. To generate the composite mat, the PA6 nanofiber mat was first electrospun, followed by the PAN nanofiber mat directly electrospun on the PA6 nanofiber mat. In our experiment, we employed the following electrospinning parameters: a voltage of 25 kV, a flow rate of 0.65 ml/h, 25 cm between the tip of the syringe and the drum collector centre, and a constant rotating speed of 1800 rpm. The mechanical properties of nanofiber composite mats, such as the tensile strength and Young’s modulus, were examined. The results demonstrate a reduction in the tensile strength and an increase in the elastic modulus of the composite nanofiber mats by 12% and 126% compared to PA6 nanofiber mats, respectively. The structure of spun nanofibers enables their use as separators for lithium-ion batteries and as a filtering medium. This article suggests the improved mechanical characteristics of nanofiber membranes for use as a barrier in lithium-ion batteries and for filtration.
6
Akash, S., Stanly Augustin, S. Suhail e Vishnu S. Nair. "Impact of Chromium Addition on the Mechanical Properties of A356 Alloy". In 2nd International Conference on Modern Trends in Engineering Technology and Management. AIJR Publisher, 2023. http://dx.doi.org/10.21467/proceedings.160.59.
Abstract (sommario):
A significant problem in the modern day automotive and aerospace industries is to manufacture more fuel-efficient components to reduce energy usage. A356 is a material that could meet the demand for an automotive industry in the manufacturing of machine components because of their high strength-to-weight ratio, high toughness and good cast ability. However the existing properties of A356 alloy can be improved by blending it with additive elements in order to meet the modern requirements of various industries. Chromium is selected for the alloying process because of its increased resistance to oxidation at high temperature and higher wear resistance. The project deals with the fabrication of A356 alloy blended with Chromium particles and the determination of impact strength, hardness, and tensile strength of the fabricated alloy. The compositions of 0.15 wt. % Cr, 0.17 wt. % Cr and 0.20 wt. % Cr with A356 are taken for conducting the experiment. The stir casting method is the most suitable method for mixing the chromium particles into the metal matrix. It is a liquid-phase fabrication method that uses mechanical agitation approach to produce the required alloy. Impact testing and hardness testing are to be conducted on the specimen by using Charpy method and Rockwell hardness tester respectively. The tensile strength of the alloy can be analyzed with the help of a universal testing machine (UTM). The results are compared with the existing properties of A356 to analyze the improvements in mechanical properties.
7
Toma, Ionut-Ovidiu, Ioana Olteanu, George Taranu, Oana-Mihaela Banu e Sergiu-Mihai Alexa-Stratulat. "EARLY AGE MECHANICAL PROPERTIES OF CEMENT BASED MORTAR WITH ZEOLITE AGGREGATES". In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/6.2/s26.52.
Abstract (sommario):
As natural resources are rapidly depleting and the demand of cement based products in construction industry is continuously increasing, there is a pressing need for finding alternatives without large penalties in terms of mechanical properties. Another issue to be resolved is related to current design guidelines developed for traditional cement based materials (e.g. mortar and concrete). Zeolites, either natural or synthetic, are crystalline alumina silicates with pozzolanic activity in cement based materials that lead to obtaining mortars and concrete with improved elastic, mechanical and durability properties. They represent a viable alternative to river or quarry aggregates. The paper focuses on assessing the early age mechanical properties of cement based mortar with natural zeolites aggregates that were used to replace river sand in different percentages: 10, 20 and 30 percent by mass. A mortar mix, without zeolite aggregates, was also considered and served as reference. Standard 40?40?160 mm mortar prisms were cast and then cured in water for 14 days. The samples were measured and weighed in order to determine the density of the mortar mixes. The damping material properties were determined based on ASTM C215 code. Flexural and compressive strength were determined in accordance to SR EN 196-1 specifications.
8
Nokesh, Dadı, Jaya Madhuri Mandava, Chokkara Mahesh, Kallepalli Mani Naga Kumar, Mohammed Abdul Rahim Ahmed, Nersu Lokesh, Tadavarthi Yuva Kiran Naga Venkata Sai Ganesh e P. Phani Prasanthi. "Mechanical Properties of Sisal and Corn Starch Mixed Polymer Matrix Composites Using Experimental and Micromechanics". In 1st International Conference on Mechanical Engineering and Emerging Technologies. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/p-5d8u23.
Abstract (sommario):
The usage of reinforcing fibers extracted from nature is increasing in the present decade due to increasing the demand for biodegradability and environmentally friendly materials. In this paper, biodegradable sisal fiber and corn starch powder mixed thermoset and thermoplastic composite are prepared and tested for Young’s modulus. The effect of sisal fiber weight fraction on the Young’s modulus is identified at constant content of corn starch powder. Later, using Micromechanics approach and Finite Element Method simulation studies are performed to estimate transverse Modulus, Shear modulus, major and minor Poisson’s ratio of the sisal and starch based polymer composites. It is found that the composites prepared with sisal fiber and corn starch powder are a promising replacement for plastic reinforced composite to promote the biodegradability, especially under high weight fraction of sisal fiber
9
K.R, Bindhu, Abiya B, Hasna Haneef, Jinu David e Justin Mathew Joseph. "Mechanical Properties of Concrete with Coconut Shell and Fibre as Additives". In International Web Conference in Civil Engineering for a Sustainable Planet. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.112.39.
Abstract (sommario):
Sustainability is a key in modern construction scenario. Even when the construction industry underwent a revolution in terms of equipment and materials used, the resultant impact on environment skyrocketed. This leads to the adoption of more sustainable approaches in construction like using coconut byproducts such as coconut fibre and shell as additives in concrete. Coconut fibre is abundantly available material which makes it a viable reinforcement material in concrete and the same goes for coconut shell which can be used as a partial replacement for conventional aggregate. This can further act as a new source of income for the coconut producers who get the benefit of the new demand generated by the construction industry. It is also an effective method of disposal of coconut husks and shells and thus reduces their negative impact on the environment. This project aims at studying the variation of strength of coconut fibre reinforced concrete (CFRC) with different percentages of coconut fibre (0.5%, 1%,1.5% and 2% by weight of cement), coconut shell aggregate concrete by replacing coarse aggregate with different percentages of coconut shell ( 15%, 30% and 45%) compared with that of conventional concrete. The optimum percentage of both fibres to be added and coconut shell to be used is determined by analyzing the strength aspects such as flexural, compressive and tensile strength. This project also includes the investigation on the mechanical properties of CFRC with coconut shell aggregate by incorporating coconut fibre and shell together in concrete matrix.
10
Leahy, P. Devin, e Christian M. Puttlitz. "Mechanical Properties of Injured Human Cervical Spine Ligaments and Corresponding Effect on Spinal Kinematics". In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53210.
Abstract (sommario):
The assessment of cervical spine instability following traumatic injury is controversial [1, 4, 5, 8]. Typical definitions of cervical instability are based on the presence of several key detectable injuries using simple radiographs, computed tomography (CT), and magnetic resonance (MR) imaging. Although these imaging modalities have been shown to be relatively reliable for detection of fractures and very large soft tissue injuries, they are largely deficient for determining the presence of smaller soft tissue injuries, such as hyperstrained ligaments [1, 3]. Soft tissue injuries of this nature may be revealed with dynamic range of motion (ROM) assessment, such as a flexion and extension test with radiography. However, these tests are currently inadequate for determining the existence of specific injuries. Cervical soft tissue injuries demand further analysis, given the risk of severe and permanent neurological impairment that may accompany these injuries [2, 5].
Rapporti di organizzazioni sul tema "On-Demand mechanical properties":
1
STUDY ON MECHANICAL PROPERTIES OF SIMPLIFIED STEEL FRAME MODEL WITH EXTERNAL WALL PANELS. The Hong Kong Institute of Steel Construction, agosto 2022. http://dx.doi.org/10.18057/icass2020.p.334.
Abstract (sommario):
A simplified analysis model of the overall steel frame with external wall panels is established by finite element numerical method, and the influence of external wall panels on the internal force and seismic performance of the steel frame is studied. Pushover analysis and cyclic loading analysis are carried out on the simplified model. The results show that the external wall panel can improve the initial stiffness and ultimate bearing capacity of the steel frame, and after considering the external wall panel, the shear demand of the column increases accordingly. Moreover, compared with the pure steel frame, the ability of the steel frame structure with the external wall panel to maintain the strength and rigidity and the energy consumption capacity are significantly improved, and the cumulative energy consumption can increase by about 16.6%. The contribution of the external wall panels to the horizontal force of the steel frame structure can reach up to about 22% when the node sliding reaches the limit, and then gradually decreases to 3.5-5.4% with the increase of the loading displacement, which still has a non-negligible impact on improving the lateral resistance of the structure.