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Online since: February 2011
Authors: Tao Zhou, Zhi Ming Zhou, Yang Hu, Li Wen Tang, Min Min Cao, Bin Bin Lei
These so called alloys have outstanding combination of high mechanical strength with good electrical conductivities [1].
These excellent properties are not only dependent on the alloy composition, but also strongly influenced by the solidified microstructure.
It has been well known that the smaller the Cr-rich phase is, the better the electric properties can achieve.
For the sake of simplicity, this physical model is dealt with using the following assumptions: (1) The thermal resistance is neglected; (2) The physical properties of the flakes and the cooling plate are constant, and are independent of temperature; (3) Mass transfer in liquid and solid is neglected; (4) There is no gap between the flake and the cooling plate, so that only heat conduction is considered.
The factors affecting the temperature distribution and the cooling rate are discussed according to the cooling rate function.
Online since: October 2008
Authors: Krzysztof Jan Kurzydlowski, Małgorzata Lewandowska, Joanna Siejka-Kulczyk, Mariusz Andrzejczuk
The degree of microstructural homogeneity has a significant influence of the mechanical properties of composites.
The flexural strength (Rf) using the three - point bend tests was used as a measure of the mechanical properties.
Another factor influencing the mechanical properties of composites is the bonding between the particles and the matrix.
Nanosilica has a beneficial effect on the properties of the composites, improving the mechanical strength and wear resistance.
Such a transformation can drastically decrease some mechanical properties and result in degradation of the ceramic.
Online since: November 2011
Authors: Xian Fu Wei, Bei Qing Huang, Xiao Xu Ma, Wan Zhang
Ink’s Properties Testing.
The value b means the biggest ink amount fills the substrate surfaces indentation by mechanical anchoring effect.
There are many factors effect the value b, and the main factor is the ink viscosity.
The main factor affects f’ is the rheological properties of ink[3].
The ink viscosity, yield value and ink silk length would affect the value f’.
Online since: September 2013
Authors: Fang Yao, Xiao Long Ma, Jing Ying Zhao, Ming Ji, Fang Wu
The main failure factors and weak parts for the products are founded out and the corresponding improvement measures are put forward.
In addition, because of manual setting, the accuracy is affected.
All these show that the aspects such as the stability of material properties of key parts, the precision the processing, the standard of the assembly, the strictness of the design has weakness.
The main failure factors and the weak parts are found out.
Mechanical Industries Publishing Company, (2004) [4] J.Y.
Online since: July 2022
Authors: E.N. Buldyzhova, Аleksandr F. Buryanov, Nadezda A. Galceva
The conclusion was formulated about the ability of additives to influence the technological and physical-mechanical properties of the filling mixtures. 1.
The final properties of the obtained filling mixtures are presented in Table 3.
Properties of the obtained filling mixtures No.
The optimal compositions of filling mixtures have been established, which correspond to both technological and physical and mechanical properties.
[13] Edamenko, A.S., Matveeva, L.Yu., Yastrebinskaya, A.V.: Influence of Gypsum Binder Phase Composition on Operational and Mechanical Properties of the Hydration Product.
Online since: September 2011
Authors: Chang Jun Qiu, Ju Zhou, Xi Yang Cheng
With the effect of tensile stress cracks appeared, which severely affected the quality of laser cladding layer, greatly limited the application and the popularization of laser cladding technology [1-3].
The microstructure evolution largely determined the macroscopic mechanical properties of the cladding layer [5].
Size of re-crystallization grain and re-crystallization rate, are not only in relevant with primitive grain size and trace elements outside, but also mainly depend on the deformation and such factors as the temperature, strain and strain rate of cooling process.
A friction factor of 0.3 and preheating temperature of 523K were used as input parameters.
Table 2 Mechanical properties Cladding layer(Ni60) Forging head Young’s modulus(MPa) 204×103 Rigid Poisson ratio 0.28 Rigid Coefficient of the thermal expansion(/K) 13.36×10-6 0 Thermal conductivity (N/(s K)) 24.8 45.7 Heat capacity (N/(mm2 K)) 5.9 3.6 Emissivity 0.7 0.7 Fig.1 The FEM model Fig.2 The result of temperature field Fig.3 The result of strain-effective Fig.4 The result of stress-X Fig.5 The result of stress-Y Fig.6 The result of average grain size The finite element model was showed in Fig.1, Fig.2 exhibited temperature field calculation results of cladding layer of micro forging after 5min’s cooling in the air, Fig.3 showed results of equivalent strain field, Fig.4 and Fig.5 showed stress results of X direction and Y direction respectively, Fig.6 revealed the result of average grain size.
Online since: September 2014
Authors: Jian Liang Hu, Shi Quan Huang, You Ping Yi
Introduction The die temperature is one of the most crucial factors during the forging process [1].
Thus, it is necessary to introduce another way to study how the die temperature affects the microstructure evolution of specimens.
Tarterini: Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, Vol.513-514 (2009), p. 176 [4] O.
Hama: Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, Vol.516 (2009), p. 180 [5] C.
Shan: Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, Vol.580 (2013), p. 294 [11] D.
Online since: December 2010
Authors: Yong Huang, Xu Ren, Wei Gang Chen
Study shows that, block type shear connector which set additional steel bars has good mechanical properties, it’s a shear only connector; Composite construction which adapt the connector has good capability of energy consumption and higher safety storage under vertical load.
The structural measures above not only solve the problem of resistance hogging momentbut also effectively improve the mechanical property of the structure.
Table 1 Bearing capacity of test pieces Test-piece name Initial cracks load /kN ultimate load /kN Shell type connector 151 556 Block type connector 150 375 Block type connector with additional bar 280 609 Fig.11 Load-displacement curve of test pieces Vertical pseudo-static analysis on composite open-web plate frame with shell type connector According to the above push-out test, the shell type connector with additional bar has good mechanical properties.
It makes the constructure undertaking additionalpressure form beginning to end and also directly affects the test result.
It can restrain the concrete and deliver shear factor effectively. 2.
Online since: May 2016
Authors: Roberto Venturini, Paolo Daniele Avancini, Nicola Barbier, Alessandro Rizzi
This work is focused on describing some aspects of the industrial production process and the investigation of the metallographic and mechanical properties for thin gauge HSLA and multi-phase steel strips.
The quality demands HS and AHS steels are higher in terms of: steel cleanness, internal soundness, homogeneous mechanical properties, homogeneous microstructure and surface quality [5].
Therefore a balance between mechanical properties and chemical composition was taken into account during the development of these steel grades.
The mechanical tests (Tab. 2) showed a good homogeneity of properties along the length of the strip and along the width.
Tab. 2 – Average mechanical properties of the different steel grades for coil head (H1-H2-H3), centre (C1-C2-C3) and tail (T1-T2-T3), with their standard deviations in brackets.
Online since: July 2021
Authors: Volodymyr Kovregin, Ivan Medved, Andrii Lysenko, Oksana Myrgorod
The article discusses Scheffe's simplex-lattice planning method using the example of describing the dependence of the properties of a mixture by a second-order polynomial [4].
Factors and levels of their variation i Factors xiн xi 1 The amount of preliminary residual deformations εн, [%] 1 -1 3 1 2 Maximum cycle voltage σmax, [MPa] 1080 -1 1280 1 The value of the preliminary residual deformation xin was set according to the deformation diagram P – Δl with a scale of 1: 80 (Fig. 1).
For the convenience of processing and interpretation of the experimental results from the natural values of the factors xin we went over to the dimensionless xi, while for the factors with equally spaced levels, the coefficients of the orthogonal Chebyshev polynomials were taken [6].
Thermodynamic properties of binary and ternary compounds of CaO-BaO-Al2O3 system.
Mechanical Engineering. (1980) 304 p
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