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Online since: October 2002
Authors: César A.C. Sequeira, Fernand D.S. Marquis
This paper discusses the mechanisms of synthesis of advanced materials developed by SHS , their microstructures and properties.
The purity of inert gas and solid reactants, the completeness of degasification process, and an inertness of container's material affect significantly the oxygen content in the final product.
The traditional sintering of nonoxide ceramics is still a major cost factor.
Similar experiments of in situ uniaxial densification of combustion synthesized TiAl in a mechanical press were also performed.
Online since: February 2018
Authors: Lu Zhang, Zhu Xian Yao, Ji Miao Xu
As for the prominent state of abrasive grain, after the truing of the grinding wheel surface, is not only influenced by the wear volume but also affected by the truing parameters.
Therefore, in this paper both orthogonal test and single factor test method are used to study the effect of truing parameters on the truing quality of grinding wheel.
Table 3 Evaluation parameters of microscopic 3D roughness of the grinding wheel Parameters Mathematical expression Property Sp Sp=Max[Z ( x, y )] Evaluation of the maximum protrusion height of abrasive grains: The larger the Sp value, the greater the maximum protrusion height of the abrasive grain.
To address the problem above, this paper carries out the single factor experiment of feed and the results of the three-dimensional roughness of the surface of the diamond grinding wheel are shown in Table 5.
Mechanical technician,1992.12 P7-P8 [5] Li Yafei etc.
Online since: November 2010
Authors: Tsutomu Miyasaka
Mechanical compression of as-coated TiO2 particles was first attempted by Hagfeldt et al.
This affects overall conversion efficiency which shows a saturation at the same thickness.
This situation is further affected by a relatively large internal resistance against the flow of photocurrent, which brings about a voltage loss (IR loss) and reduces fill factor (FF) of the I-V curve.
Apart from the photoanode, substrate of counterelectrode need not necessarily has transparent property like FTO and ITO.
It can supply a large photocurrent by exposure to sunlight without a large loss in fill factor (IR loss).
Online since: February 2019
Authors: Liliana Sachelarie, Nicoleta Dumitrascu, Adina Rotaru-Birgaoanu, Teodora Teslaru, R. Ionut Olariu, Ionut Chirap
The efficiency of the sealing procedure depends on various factors, from the techniques of enamel surface preparation to the quality of bonding agents, dentists’ skills and clinical conditions, including the diet and oral hygiene of the patient [4, 5].
In practice, one may use various kinds of sealants, well-defined according to their composition (presence of fillers and coloring agents), polymerization method, physical properties (mechanical strength, elasticity, viscosity and aging), technique of application, costs etc. may be applied [12, 13].
One important tooth property that may affect sealant retention is its surface morphology, a higher roughness being beneficial for the mechanical preservation at the surface, improving sealant bonding to the enamel [14, 4].
Skin Melanin, Hemoglobin, and Light Scattering Properties can be Quantitatively Assessed in Vitro Using Diffuse Reflectance Spectroscopy.
Optical properties of enamel and translucent composites by diffuse reflectance measurements.
Online since: August 2004
Authors: Man Yong Choi, Jung Yeol Park, Hong Dong Cho, Sang Hoon Han
That is, de-bonding of CFRP plate can be considered as an important factor of specimen failure.
Especially, CFRP plate whose mechanical properties and chemical resistance are excellent is recently used much.
The threshold level was fixed at 48dB considering the electrical and mechanical noise, and then measured data were analyzed in PC.
Used material properties were provided from manufacturer, and tensile strength and elastic modulus of CFRP plate were 2.7~3.0GPa and 165MPa, respectively.
This was attributed to the fact that in case of small strengthening width AE count was affected by partial composite action such as slip between concrete and CFRP plate.
Online since: January 2013
Authors: Elena Panchenko, Haluk E. Karaca, Hans J. Maier, Ibrahim Karaman, Thomas Niendorf, Jayaram Dadda, Jan Lackmann, James A. Monroe
Maier1,h 1 Lehrstuhl für Werkstoffkunde (Materials Science), University of Paderborn, Pohlweg 47-49, 33098 Paderborn, Germany 2German Aerospace Center (DLR), Institute of Materials Research, 51170 Köln, Germany 3 Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA 4 Siberian Physical-Technical Institute, Tomsk 634050, Russia 5 Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506-0503, USA aniendorf@mail.upb.de, bjayaram.dadda@dlr.de, cjan.lackmann@benteler.de, djamonroe848@tamu.edu, eikaraman@tamu.edu, fpanchenko@mail.tsu.ru, gkaraca@engr.uky.edu, hhmaier@mail.upb.de Keywords: shape memory alloys (SMA); martensitic phase transformation; nucleation, phase transformation; internal friction; martensite variants Abstract.
Introduction In recent years, high-temperature shape memory alloys (HTSMAs) have gained increasing attention owing to their attractive properties, which are of interest for applications in aerospace, automobile, robotic and energy exploration and conversion industries, where the operating temperatures are often well above 100 °C [1].
Many of the properties of CoNiGa HTSMAs such as structural and phase transformation characteristics [11,12] and fundamental shape memory and pseudoelastic behavior (i.e. transformation strains, stress and thermal hysteresis and cyclic stabilities as functions of temperature and stress) [13-17] have been thoroughly examined.
The stress state also affects the thermal hysteresis and the magnitude of the transformation strains of the [001]-oriented Co49Ni21Ga30 crystals.
Since the Schmidt factor of the prevailing {110} <001> slip system is zero in B2-ordered alloys such as NiTi and CoNiGa [18], the influence of dislocation slip is minimized in this orientation.
Online since: July 2021
Authors: Andrey V. Kochetkov, T.N. Ivanova, Ludmila V. Seliverstova, Oleg V. Zakharov
The effective scope in the production of mechanical engineering products is still limited by both the materials used and the design of the products.
In this case, the error of the arms, taking into account their parallel action, affects the positioning error of the end effector in a complex way.
Kovalkova, Аutomatisation of Calculation Method of Technological Parameters of Wiredrawing with Account of Speed Factor and Material Properties, Solid State Phenomena. 299 (2020) 552-558
Oglodkov, Investigation into the Formation of Texture, Microstructure, and Anisotropy of Properties during Rolling Sheets of the Aluminum–Lithium 1420 Alloy, Russian Journal of Non-Ferrous Metals. 59 (2018) 56-61
Bonnard, Design and dimensional synthesis of a Linear Delta robot with single legs for additive manufacturing, Journal of the Brazilian Society of Mechanical Sciences and Engineering. 41 (2019) 536
Online since: July 2017
Authors: Budhijanto Budhijanto, Mohammad Fahrurrozi, Rochmadi Rochmadi, Suhandono Suhandono, Febbie Setyaningrum, Adimas Prasetyaaji
The results exhibited good coating properties.
Atimuttigul et al. [15] studied the effect of oil type on the properties of short oil alkyd.
Olatunji, Improving Jatropha curcas Linnaeus oil alkyd drying properties, Prog.
Tanthapanichakoon, Effects of oil type on the properties of short oil alkyd coating materials, Korean J.
Sami Boufi, Synthesis and properties of hybrid alkyd–acrylic dispersions and their use in VOC-free waterborne coatings, Prog.
Online since: November 2009
Authors: Robert E. Rudd
This particular potential was chosen to provide a good representation of the elastic properties of Ta at a moderate computational cost.
They provide a powerful way to express the orientations and misorientations of a polycrystalline material, facilitating the analysis of the grain boundary network including coincident-site lattice properties [56,59]-it is for this reason we use them here.
The nucleation of dislocations and twins is expected to be governed by the overall shear stress modified by local stress concentrators, as well as the usual considerations of lattice orientations (Schmid factors), mobilities and nucleation thresholds [64].
This strain hardening rate is a factor of 3 lower than the experimental value quoted above, and a factor of 30 lower than the biaxial value.
Dieter: Mechanical Metallurgy, 3rd ed.
Online since: October 2023
Authors: Sudhakar Reddy, Ishant Jain
Technically, they are mechanical cable entry devices.
Similarly, an insufficient function is performed by lock nut over the junction box where it holds/pushes it changing the surface area as property.
Contradiction, in TRIZ, happens when solving one improving parameter or characteristic of a technique negatively affects the same or other characteristics or parameter of the characteristics.
Table 3 Improving and worsening parameter from 40 engineering parameters Improving Parameters 11 - Tension or Pressure 13 - Stability of Object 14 - Strength 27 - Reliability Worsening Parameters 26 - Amount of Substance 36 - Complexity of Device Altshuller matrix was formed between improving and worsening factors to identify the underlying inventive principles as shown in figure 12.
Altshuller matrix was formed between improving and worsening factor to identify the underlying inventive principles as shown in figure 14.
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