Mechanical Properties (mechanical + property)

Distribution by Scientific Domains
Distribution within Polymers and Materials Science

Kinds of Mechanical Properties

  • different mechanical property
  • dynamic mechanical property
  • enhanced mechanical property
  • excellent mechanical property
  • exceptional mechanical property
  • good mechanical property
  • improved mechanical property
  • poor mechanical property
  • superior mechanical property
  • tensile mechanical property
  • tissue mechanical property


  • Selected Abstracts


    GEOMETRICAL, THERMAL AND MECHANICAL PROPERTIES OF OLIVE FRUITS

    JOURNAL OF FOOD PROCESS ENGINEERING, Issue 2 2010
    MOHAMAD I. AL-WIDYAN
    ABSTRACT In Mediterranean countries, olive trees play a significant economical role. Knowledge of olive fruits properties is essential for the efficient handling of the product and optimizing oil yield. The lack of such knowledge at the local level triggered this study in an attempt to report the fruit's chemical composition and some major engineering properties. Established procedures were followed in conducting the measurements and calculations on fruit samples. The study examined four major varieties of olive fruits, including Spanish, Black Spanish, improved Nabali and Nabali Baladi for their chemical composition and other properties, including geometrical, thermal and frictional properties. Thermal properties, including thermal conductivity, heat capacity and thermal diffusivity, ranged from 0.41 to 0.47 W/(mK), 2.35 to 2.39 kJ/(kgK) and 2.88 10,7to 2.779 10,7 m2/s, respectively. The geometrical properties of the Spanish and Black Spanish were quite similar except for roundness and sphericity. Similar results were found for improved Nabali and Nabali Baladi. The properties of weight, density and packing coefficient ranged from 2.22 to 8.60 g, 890 to 1,230 kg/m3 and 0.43 to 0.52, respectively. The fruit's static friction coefficient over mild steel, aluminum and softwood surfaces ranged from 0.20 to 0.30, 0.21 to 0.29 and 0.22 to 0.33, respectively. PRACTICAL APPLICATIONS In Jordan and other Mediterranean countries, olive fruits are produced in large quantities every season. They are very widely used as pickled fruits or are processed in mills to extract their oil. Despite the fact that fruit properties are a necessary prerequisite for the efficient handling and processing of fruits, literature search indicated the lack of a comprehensive study of scientific merit that reports on the engineering properties of olive fruits. In addition, it is established that knowledge of the fruit properties leads to optimized handling and processing and results in knowledge-based development of all processes and equipment that deal with the fruits. The practical merit of this study stems from the fact that it reports on the key properties of a major product (olive fruits) that has social, cultural and economical significance throughout a whole region and is expanding throughout the globe. [source]


    ANTIMICROBIAL, PHYSICAL AND MECHANICAL PROPERTIES OF CHITOSAN-BASED FILMS INCORPORATED WITH THYME, CLOVE AND CINNAMON ESSENTIAL OILS

    JOURNAL OF FOOD PROCESSING AND PRESERVATION, Issue 6 2009
    M.H. HOSSEINI
    ABSTRACT Chitosan-based films containing thyme, clove and cinnamon essential oils at 0.5, 1 and 1.5% v/v were prepared to examine their antibacterial, physical and mechanical properties. Scanning electron microscopy was carried out to explain structure,property relationships. Films containing thyme essential oil revealed larger inhibition zones than those containing clove and cinnamon essential oils against gram-positive and gram-negative bacteria tested. Films were more effective against gram-positive bacteria than gram-negative. Incorporating thyme and clove essential oils into chitosan-based films increased moisture content (from 17.80,28.38%), solubility in water (25.97,30.62%), water vapor transmission rate (0.00233,0.00571 g/s/m2) and elongation at break (25.31,42.70%) of films. Cinnamon-enriched films had opposite changes such as increase in tensile strength (from 12.2,21.35 MPa) and decrease in moisture content (17.80,9.36%) and solubility in water (25.9,14.21%) of films. PRACTICAL APPLICATIONS Microbial growth on food surfaces is a major cause of food spoilage. Combining antimicrobial agents such as plant essential oils directly into a food packaging polymer is a form of active packaging. These films possess the potential for improving microbial stability of foods by acting on the food surface upon contact. Because of the effect of direct addition of plant essential oils to food on sensory characteristics of packaged food, incorporation of essential oils into films may have additional applications in food packaging. [source]


    PREDICTION OF MECHANICAL PROPERTIES OF CUMIN SEED USING ARTIFICIAL NEURAL NETWORKS

    JOURNAL OF TEXTURE STUDIES, Issue 1 2010
    M.H. SAIEDIRAD
    ABSTRACT In this paper, two artificial neural networks (ANNs) are applied to acquire the relationship between the mechanical properties and moisture content of cumin seed, using the data of quasi-static loading test. In establishing these relationship, the moisture content, seed size, loading rate and seed orientation were taken as the inputs of both models. The force and energy required for fracturing of cumin seed, under quasi-static loading were taken as the outputs of two models. The activation function in the output layer of models obeyed a linear output, whereas the activation function in the hidden layers were in the form of a sigmoid function. Adjusting ANN parameters such as learning rate and number of neurons and hidden layers affected the accuracy of force and energy prediction. Comparison of the predicted and experimented data showed that the ANN models used to predict the relationships of mechanical properties of cumin seed have a good learning precision and good generalization, because the root mean square errors of the predicated data by ANNs were rather low (4.6 and 7.7% for the force and energy, respectively). PRACTICAL APPLICATIONS Cumin seed is generally used as a food additive in the form of powder for imparting flavor to different food preparations and for a variety of medicinal properties. Physical properties of cumin seeds are essential for the design of equipment for handling, harvesting, aeration, drying, storing, grinding and processing. For powder preparation especially the fracture behavior of the seeds are essential. These properties are affected by numerous factors such as size, form and moisture content of the grain and deformation speed. A neural network model was developed that can be used to predict the relationships of mechanical properties. Artificial neural network models are powerful empirical models approach, which can be compared with mathematical models. [source]


    RELATIONSHIPS BETWEEN PRIMARY PLANT CELL WALL ARCHITECTURE AND MECHANICAL PROPERTIES FOR ONION BULB SCALE EPIDERMAL CELLS

    JOURNAL OF TEXTURE STUDIES, Issue 6 2004
    DAVID G. HEPWORTH
    ABSTRACT This article investigates onion epidermal tissue (Allium cepa) using a combination of mechanical testing, microscopy and modeling and relates tissue mechanical properties to the known structure of the cell walls. Onion epidermal tissue has a simple, regular structure of elongated cells, which have been used to enable the contributions to mechanical properties of cell walls and of higher order structures to be separated and analyzed. Two models of wall behavior were used to explore how Poisson's ratio of cell walls parallel to the plane of the epidermal surface may vary with applied strain. In the first model, cellulose microfibrils can be reorientated in an unrestricted way with the result that the cell wall volume decreases. In the second model the volume of the cell wall remains constant, which controls the reorientation of microfibrils, hence the Poisson's ratio. Measurements made from uniaxially stretched cells show that the data most closely fits model I, therefore, it is concluded that the bulk of the matrix has little influence on the observed mechanical properties (at a test rate of 1 mm/min), allowing cellulose microfibrils to reorient through the matrix in an unrestricted way during uniaxial tests. In its mechanical attributes the primary cell wall resembles more a knitted cloth than a semisolid composite material. When biaxial stretching is applied to tissue, so that there is no re-orientation of microfibrils, the cell wall material is still able to reach surprisingly large elastic strains of up to 12.5% and no plastic deformation was recorded. Current theory suggests that cellulose microfibrils can stretch elastically by a maximum of 7%, therefore further work is required to identify mechanisms that could account for the extra elastic strain. [source]


    MECHANICAL PROPERTIES OF A FRIED CRUST,

    JOURNAL OF TEXTURE STUDIES, Issue 1 2001
    ISABEL LIMA
    A restructured potato model system was fried in canola oil for 5, 10, or 15 min at 170, 180, or 190C and tested in a Dynamic Mechanical Analyzer. Selected mechanical properties were measured using puncture and three-point bending cells. Forces involved in puncture were a combination of tension, compression, and shear, while the three-point bend test studied the crust flexural properties. Crust deformability seemed to be governed by internal structural yielding. Maximum force at rupture increased significantly with both frying time and temperature. Failure criteria identified and standardized types of failure observed during bending tests. [source]


    MECHANICAL PROPERTIES OF TWO-PHASE DISPERSE AGAR/GELATIN MIXED GELS

    JOURNAL OF TEXTURE STUDIES, Issue 3 2000
    KEIKO FUJII
    ABSTRACT Agar/gelatin mixed gels with the same composition but with a different two-phase disperse structure were prepared and their mechanical properties compared. The agar/gelatin mixture was first kept at temperature above the gelling temperature of gelatin but below that of agar and stirred for the selected period, before cooling it below the gelling temperature of gelatin. For the low rupture stress system the agar concentration was 0.7% (w/w), while the gelatin concentration was 4.5% (w/w) to achieve the same rupture stress as the agar gel. The mixing temperatures selected were 20 and 37C. For the high rupture stress system, the agar and gelatin concentration was 2.8 and 10.4% (w/w), respectively, to achieve the same rupture stress. The mixing temperatures selected were 37 and 40C. The both mixed gels prepared by this method consisted of a dispersed phase of agar and a continuous phase of gelatin. The rupture stress of the mixed gels decreased as the content of the dispersed phase increased. The rupture stress had a tendency to be lower as the size of the dispersed particles increased. These results suggest that the interface between the dispersed phase and the continuous phase plays an important role as Griffith's crack, with the rupture of mixed gels occurring from that place. [source]


    MECHANICAL PROPERTIES OF UNPRESSED SEMI-HARD CHEESES BY UNIAXIAL COMPRESSION

    JOURNAL OF TEXTURE STUDIES, Issue 2 2000
    BRIGITTE WEINRICHTER
    ABSTRACT Different lots of Tilsit cheeses, which are characterized by their open structure caused by pressing under their own weight during manufacture, were subjected to uniaxial compression, a quasi-standard for the evaluation of mechanical properties of hard and semi-hard cheeses. Additionally, video films showing the behaviour of the specimens during compression were analysed. For standard Tilsit with a fat content of 35% in dry matter, the cheese mass proved to be highly anisotropic with respect to stress response and lateral expansion expressed as apparent Poisson number. Specimens cut perpendicular to the flat side of the cheese wheels, which had lentil-shaped eyes with their major axis parallel to the compression plates, showed significantly higher stresses and lower Poisson numbers than specimens sampled parallel to the flat side of the cheese wheels. Therefore, stress values calculated on the basis of actual specimen diameter were different from those calculated by assuming constant specimen's volume. However, for samples with a fat content of approx. 60% in dry matter no differences caused by compression direction were observed. [source]


    Mechanical Properties of Compound Extruded Aircraft Stringer Profiles Under Cyclic Loading,

    ADVANCED ENGINEERING MATERIALS, Issue 7 2010
    Kay A. Weidenmann
    The worldwide competition in the field of aircraft structures leads to an increasing need for functionality and safety as well as for cost and weight reduction. For instance stringers could be directly welded on the aircraft's skin sheet. The requirements to be met are increased safety against crack initiation and crack growth as well as improved residual strength against failure after harmful impact of foreign objects. The application of continuously reinforced aluminium profiles which are manufactured by compound extrusion leads to increased strength and stiffness of the profiles by combining the aluminium matrix with high strength wires. Thus aircraft stringers of such profiles represent an innovative concept with improved properties. The characterisation of compound extrusions based on medium and high strength aircraft aluminium alloys EN AW-6056 and EN AW-2099 shows that a good embedding of the reinforcing high strength wires (Co-based and Fe-based) can be achieved. Furthermore the mechanical properties under cyclic loading of the profiles were measured and the S/N-curves for the different compound combinations were determined. Subsequently the crack initiation and propagation was analysed by using metallographic and SEM investigations. The fatigue resistance of reinforced specimens is increased compared to unreinforced ones. The fatigue cracks originate at the surface of unreinforced specimen while the cracks in reinforced specimens are initiated at the wire,matrix interface. [source]


    Microstructure Evolution and Mechanical Properties of Linear Friction Welded Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti17) Titanium Alloy Joints,

    ADVANCED ENGINEERING MATERIALS, Issue 1-2 2010
    Wen-Ya Li
    The microstructural evolution, microhardness, tensile properties and impact toughness of Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti17) alloy joints welded by linear friction welding (LFW) are investigated. A narrow, sound weld is formed, consisting of a superfine ,,+,, structure in the weld center. The structure gradually changes from the weld center to the parent Ti17 in the TMAZ, with the highly deformed , and , phases oriented along the deformation direction, owing to the uneven deformation and temperature distribution. The microhardness of the TMAZ is the lowest of the distinct zones and presents a valley-like shape. The tensile strengths of the joints are comparable to that of the parent Ti17 but with a much lower plasticity and impact toughness. The microstructure variation contributes to the resultant properties. [source]


    Microstructure and Mechanical Properties of New AlCoxCrFeMo0.5Ni High-Entropy Alloys

    ADVANCED ENGINEERING MATERIALS, Issue 1-2 2010
    Chin-You Hsu
    Effects of Co content on microstructures and hot hardness of a new high-entropy alloy system, AlCoxCrFeMo0.5Ni (x,=,0.5 to 2.0) were investigated. As cobalt content increases, the microstructure changes from dendrite to polygrain type and the constituent phases change from BCC,+,, at x,=,0.5 to BCC,+,FCC,+,, at x,=,2.0. The alloy hardness varies from Hv 788 at x,=,0.5 to Hv 596 at x,=,2.0. This can be explained with the relative amount of hard , phase, medium hard BCC phase and soft FCC phase. All the AlCoxCrFeMo0.5Ni alloys possess higher hardness level than that of Ni-based superalloys In 718/In 718 H from room temperature to 1273,K. They obey the Westbrook equation presenting the normal heating behavior. Both alloys of x,=,0.5 and 1.0 exhibit a transition temperature higher than that of Co-based alloy T-800 by about 200,K. They also have a high hot hardness of Hv 347 at 1273,K, which is higher than those of In 718 and In718 H by Hv 220. The strengthening mechanism for their superiority is proposed. The AlCoxCrFeMo0.5Ni alloy system has great potential in high-temperature applications. [source]


    Correlation of Ultrastructure with Mechanical Properties of Nano-Hybrid Dental Composites,

    ADVANCED ENGINEERING MATERIALS, Issue 10 2009
    Lena Schmitt
    Determination of mechanical properties of nano-hybrid dental composites leads to strong correlation to material's ultrastructure. Not only does total filler content in percentage of weight affect the mechanical properties, but the combination of optimal filler size and shape with homogeneous distribution of filler particles and an optimal amount of different sized fillers in finally cured dental composites lead to desired mechanical and thermo-mechanical properties. [source]


    Influence of Filler Composition on the Microstructure and Mechanical Properties of Steel,Aluminum Joints Produced by Metal Arc Joining (Adv. Eng.

    ADVANCED ENGINEERING MATERIALS, Issue 5 2009
    Mater.
    The cover shows the inverse pole figure map obtained by EBSD on the cross section of an hybrid aluminium-to-steel joint produced by the Cold Metal Transfer welding technique on a specially designed butt geometry,More details can be found in the article of L. Agudo et al. on page 350. [source]


    Influence of Filler Composition on the Microstructure and Mechanical Properties of Steel,Aluminum Joints Produced by Metal Arc Joining,

    ADVANCED ENGINEERING MATERIALS, Issue 5 2009
    Leonardo Agudo Jcome
    Chemical joining of aluminum to steel parts is one of the main challenges in the automotive industry to achieve sound economical solutions for required automobile weight reduction. The cold metal transfer (CMT) is a fusion welding process developed to meet that challenge. It is shown in this paper how the choice of proper filler materials can yield appropriate mechanical performance of specially designed dissimilar CMT butt joints by improving the seam characteristics and weld bead properties. [source]


    Microstructures and Mechanical Properties of ZrC Reinforced (Zr-Ti)-Al-Ni-Cu Glassy Composites by an In Situ Reaction,

    ADVANCED ENGINEERING MATERIALS, Issue 5 2009
    Tao Liu
    Wetting behaviors of TiC and ZrC by a molten Zr55Al10Ni5Cu30 alloy were investigated in order to give an instruction in synthesizing the glassy composites using a liquid casting route. The (Zr-Ti)55Al10Ni5Cu30 bulk metallic glass matrix composites, reinforced by in situ ZrC particles were then fabricated by copper mold casting. The microstructure and mechanical properties were investigated systematically. [source]


    Microstructures and Mechanical Properties of Hot-Pressed ZrB2 -Based Ceramics from Synthesized ZrB2 and ZrB2 -ZrC Powders,

    ADVANCED ENGINEERING MATERIALS, Issue 3 2009
    Wei-Ming Guo
    The influence of ZrC on the microstructure and mechanical properties of ZrB2 -SiC ceramics was investigated. SEM observation showed that the presence of ZrC greatly inhibited the grain growth of ZrB2 and SiC phases. With the introduction of ZrC, the Vickers' hardness, fracture toughness, and bending strength of the sintered ceramics increased significantly. [source]


    Temperature-Sensitive Simultaneous Interpenetrating Polymeric Networks With Improved Mechanical Properties and Shrinking Kinetics,

    ADVANCED ENGINEERING MATERIALS, Issue 3 2009
    Jian-Tao Zhang
    In this study, a new IPN structure was designed and a simultaneous method was for the first time utilized to prepare temperature sensitive PNIPAAm IPN hydrogels by carrying out the radical polymerization and hydrolysis/condensation for two kinds of reaction at the same time. Due to the specific structures, the newly prepared simultaneous IPN gels displayed higher elastic modulus and faster shrinking rates than the conventional PNIPAAm gel. [source]


    Hollow Cathode Gas Flow Sputtering of NixAly Coatings on Ti-6Al-2Sn-4Zr-6Mo: Mechanical Properties and Microstructures,

    ADVANCED ENGINEERING MATERIALS, Issue 1-2 2009
    Andreas Kohns
    A W-TiB2 -multilayer erosion resistant coating with a NixAly bond coat deposited by hollow cathode gas flow sputtering is under development for Ti6246 aero engine compressor blades. Blade vibrations in service can produce cracks in the coating propagating into the substrate and reducing the high-cycle fatigue strength of the component. It is assumed, that this effect can be diminished by adapting the mechanical and morphological properties of the NixAly bond coat. In this context, process parameter variations are performed and discussed. [source]


    Influence of Ti on the Mechanical Properties of AgCuInTi Active Brazing Fillers,

    ADVANCED ENGINEERING MATERIALS, Issue 1-2 2009
    Matteo Galli
    Active brazing fillers were produced by adding Ti to a AgCuIn alloy and used to fabricate ceramic-metal joints. The alloy was investigated by hardness measurements and microscopy analyses and the joints tested in bending. The results show that Ti has a hardening effect. However, for the considered values of Ti addition (0.5,1.5 wt %), the extent of the hardening is insignificantly influenced by the Ti introduced in the filler. [source]


    Roll-Bonded Titanium/Stainless-Steel Couples, Part 2: Mechanical Properties after Different Material-Treatment Routes

    ADVANCED ENGINEERING MATERIALS, Issue 1-2 2009
    S. Dziallach
    The accessible mechanical properties of a roll-bonded titanium/stainless-steel couple, consisting of grade-1 titanium and a low-carbon Cr-Ni-Mo-steel (1.4404), after different heat treatments are described. The mechanical properties, determined by tensile and stretch-forming tests, facilitate the optimum process widow for the heat-treatment parameters after roll bonding. The results of stretch-forming tests to determine the forming limits of the composite are shown. These tests also give important indications of the failure mechanism of the composite. Deep-drawing tests allow a first estimation of the deep-drawing functional area for a subsequent forming process to be made. [source]


    Selective Electron Beam Melting of Cellular Titanium: Mechanical Properties

    ADVANCED ENGINEERING MATERIALS, Issue 9 2008
    P. Heinl
    Cellular titanium seems to be a promising material for medical implant applications due to an elastic modulus comparable with human bone and an interconnected porosity which facilitates bone ingrowth. This paper reports the mechanical properties of non-stochastic cellular Ti-6Al-4V structures fabricated by Selective Electron Beam Melting depending on different unit cell sizes and varying energy input per unit length of the electron beam. [source]


    Influence of Homogenization Annealing of AZ91 on Mechanical Properties and Corrosion Behavior,

    ADVANCED ENGINEERING MATERIALS, Issue 1-2 2008
    M.-C. Zhao
    A homogenization annealing (HA) heat treatment is proposed for property enhancement for AZ91; HA for 10 h at 410,C caused an improvement in hardness, ultimate tensile strength and ductility without loss of corrosion properties. The influence on the corrosion behavior of the microstructure was studied. [source]


    Mechanical Properties and Environmental Behavior of a Magnesium Alloy with a Nano-/Sub-Micron Structure

    ADVANCED ENGINEERING MATERIALS, Issue 9 2007
    E. Aghion
    Abstract Newly developed magnesium alloys with a consolidated nano/sub-micron structure and substantially higher specific strength may be considered as an interesting candidate for super-light high-strength applications. Consolidated nano/sub-micron structure applies to alloys with a combined microstructure of nano-crystalline and sub-micron grains. The aim of the present study was to explore the mechanical and environmental behavior of a consolidated nano/sub-micron magnesium alloy with the composition of AZ31. This was required in order to evaluate the applicability of this new structured alloy for practical applications. Although the nano/sub-micron structured alloy has more than twice the hardness and strength of the conventional alloy, its ductility and corrosion resistance were significantly lower. In addition, its stress corrosion characteristics were inferior. The significant limitation of the nano-structured alloy, in terms of ductility and corrosion performance, restricts its potential use as a structural material for practical applications. [source]


    Novel Nanoparticle-Reinforced Metal Matrix Composites with Enhanced Mechanical Properties

    ADVANCED ENGINEERING MATERIALS, Issue 8 2007
    C. Tjong
    Abstract This paper summarizes and reviews the state-of-the-art processing methods, structures and mechanical properties of the metal matrix composites reinforced with ceramic nanoparticles. The metal matrices of nanocomposites involved include aluminum and magnesium. The processing approaches for nanocomposites can be classified into ex-situ and in-situ synthesis routes. The ex-situ ceramic nanoparticles are prone to cluster during composite processing and the properties of materials are lower than the theoretical values. Despite the fact of clustering, ex-situ nanocomposites reinforced with very low loading levels of nanoparticles exhibit higher yield strength and creep resistance than their microcomposite counterparts filled with much higher particulate content. Better dispersion of ceramic nanoparticles in metal matrix can be achieved by using appropriate processing techniques. Consequently, improvements in both the mechanical strength and ductility can be obtained readily in aluminum or magnesium by adding ceramic nanoparticles. Similar beneficial enhancements in mechanical properties are observed for the nanocomposites reinforced with in-situ nanoparticles. [source]


    Microstructure Evolution and Mechanical Properties of Linear Friction Welded 45 Steel Joint

    ADVANCED ENGINEERING MATERIALS, Issue 8 2007
    J. Ma
    Linear friction welding (LFW) is an emerging solid-state joining process to extend the current applications of welding. The microstructure evolution and mechanical properties of LFW 45 steel joint were investigated. The microstructures from the weld center to the parent metal were the superfine ferrite+pearlite in the weld center, the deformed fine ferrite + pearlite in the thermomechanically affected zone, the tempered sorbite, troosite and martensite in the heat affected zone. The microhardness of the joint decreased gradually from the parent metal to the weld center. The tensile properties of the joint were significantly improved in both the strength and ductility. The microstructure evolution, microhardness variation and fracture position are attributed to the various thermal histories of different positions. [source]


    Mechanical Properties and Corrosion Resistance of a Novel Ni-Cr-Mo Alloy,

    ADVANCED ENGINEERING MATERIALS, Issue 1-2 2007
    P. Huang
    A new Ni-23Cr-18Mo (wt.%) alloy, designated as Nistelle Super C, was developed recently at Deloro Stellite Inc. for high corrosion resistance applications. Microstructure and phase transformation behaviour of the alloy were studied using SEM and DSC techniques, respectively. Mechanical properties such as stress - strain relation of the alloy and load , depth relation of individual phases of the alloy were determined under uniaxial tension and under nano indentation, respectively. Corrosion resistance of the alloy in oxidizing and reducing acids was evaluated in accordance with ASTM standard test designation G31-72. [source]


    Determination of Mechanical Properties of Copper at the Micron Scale,

    ADVANCED ENGINEERING MATERIALS, Issue 11 2006
    D. Kiener
    Using a focused ion beam workstation, micron-sized bending and compression samples were fabricated from a pure copper single crystal. The bending and compression experiments exhibited a strong size effect on the flow stress of copper, reaching values in the order of 1,GPa for the smallest test structures. Conventional strain gradient plasticity approaches are not capable of explaining this behaviour. The surface damage introduced by Ga+ ion implantation during focused ion beam preparation was investigated using Auger electron spectroscopy and its consequence on the mechanical response of the miniaturized test samples is addressed. [source]


    Optimization of Mechanical Properties of NiAl-base Alloy by Suction Casting,

    ADVANCED ENGINEERING MATERIALS, Issue 4 2006
    W. Huai
    The suction-cast NiAl-Cr(Mo)/Hf alloy exhibits a refined microstructure and extended solid solubility. Significant improvement in room temperature ductility and strength was achieved by adopting suction casting technique. In addition, their elevated temperature strength also got slightly increase. The optimized mechanical properties can be attributed to the fine interlamellar spacing, the extended solid solubility and the increased cell eutectic zone as well as the refined Heusler phase. [source]


    Alumina/Alumina and Alumina-Zirconia/Alumina-Zirconia Joints Through Glass Interlayers, Microstructure, Mechanical Properties and Residual Stresses

    ADVANCED ENGINEERING MATERIALS, Issue 6 2005
    G. Faga
    As alternative to traditional joining methods, Ca-Al silicate glasses were used to self-bond alumina and alumina-zirconia ceramics under different processing conditions. Microstructures, mechanical properties and residual stress studies have shown glassy interlayer characteristics to be correlated with the chemistry of the starting glasses and of the ceramics. [source]


    Nanocomposite Hard Coatings: Deposition Issues and Validation of their Mechanical Properties,

    ADVANCED ENGINEERING MATERIALS, Issue 5 2005
    P. Schwaller
    Abstract The limitations of conventional coatings due to inferior hardness or poor oxidation stability can be overcome by nanocomposite hard coatings such as nc-TiN/a-SiNx, which consists of nanocrystalline TiN and a non-crystalline tissue phase of SiNx which are mutually immiscible. The properties of nanocomposite coatings, especially their increased hardness, can be explained by their nanostructure, which leads to a maximum hardness at typically 80 atomic percent of the crystalline phase. We show that enhanced hardness can only be attained when the silicon nitride phase is sufficiently nitrided. The accurate and reliable measurement of the hardness and elastic modulus requires the use of appropriate nanoindentation equipment and a careful tip correction with periodical validation. It is shown that for a correct hardness determination of a few microns thick nanocomposite coatings, an indentation depth of 100,nm is sufficient. The maximum hardness of our nc-TiN/a-SiNx coatings deposited by a hybrid UBM/arc-PVD process is about 40,GPa. This value represents a global hardness value, due to the nanocomposite structure there may be a local hardness variation of about 10,%. [source]


    The new easyFoam -Process and Mechanical Properties of Foam-Coating-Sandwiches

    ADVANCED ENGINEERING MATERIALS, Issue 11 2004
    M. Maurer
    Coated aluminium foams were heat treated. The influence on the mechanical properties was investigated. In order to produce cost-efficient foam sandwiches, the foaming and coating processes were modified and the new easyFoam -process was developed. It consists of coating foamable semi-finished parts before inductive foaming. This process allows a fast and continuous production of long foam sandwiches. No expensive moulds are needed. [source]