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Online since: October 2014
Authors: Hai Liang Wu, Yan Qin Shen, Yi Chen Tang, Dan Zhou
Some film adhesion is good, can increase the film strength and elastic; some combination is good, thus it not only plays a variety of pulp properties, but also improves the serosa abrasion resistance.
ND J-79 Rotary viscometer, ASS3000 Full automatic single yarn sizing machine. 1.3 Experimental operation 1.3.1 Test of basic performance The basic properties of the size must be mastered when develop the size formula.
The basic properties of pulp slurry formulation are formulated to master.
There is a close relationship between adhesion performance and sizing effect and sizing quality, is one of important factors of sizing process.
But because the properties of various solid poly-acrylic acid sizes are different, the sizing affects differences.
Online since: January 2022
Authors: Naoki Omura, Yuichiro Murakami
EMS is easy to increase size than the mechanical vibration method.
Therefore, the flow velocity and a resistance force on the solidification interface may have affected the areal ratio on α-Al particles.
Tada, Effects of Mechanical Vibration Factors on Size and Shape of Solid Particles in JIS AC4CH Aluminum Alloy Semi-Solid Slurry, Materials Transactions 57 (2016) 163-167
Omura, Development of Slurry Preparation Method by Applying Mechanical Vibration, Solid State Phenomena 285 (2019) 333-338
Wang, Microstructural evolution of thixomolded AZ91D magnesium alloy with process parameters variation, Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 444 (2007) 251-256
Online since: June 2021
Authors: De Fu Li, Bao Hong Zhu, Nan Nan Wang, Zhong Wen Li, Zhi Guo Liu, Si Yu Yao, Zhi Shui Yu
It is generally believed that in (α+β) type titanium alloys, the microstructure directly affects the properties.
The origin of microstructural diversity, texture, and Mechanical Properties in Electron Beam Melted Ti-6Al-4V[J].
Microstructure and mechanical properties of Ti–6Al–4V parts build by selective laser melting [J].
Graded microstructure and mechanical properties of additive manufactured Ti–6Al–4V via electron beam melting[J]. 2015, 97: 1-16
Heat treatment of Ti6Al4V produced by selective laser melting: microstructure and mechanical properties[J].
Online since: February 2013
Authors: Wen Bai Liu, Hong Ming Jiang
Thus, the study on basic mechanical properties of artificial modified soil, like compression deformability and shear strength, is what engineering community pays attention to.
This paper makes an experimental study on the compression deformability and shear strength of dredged soil solidified with a kind of composite curing agent, and systematically analyzes the influential factors.
Fundamental mechanical properties of solidified dredged marine sediment[J].
Influence of clay content on mechanical properties of solidified silt[J].
Compression properties and structure yield stress for solidified soil composing of dredged clays[J].
Online since: September 2008
Authors: Andrea E. del Grosso
Smart technologies are not limited to provide sensing and actuation devices but also include innovative materials, able to provide built-in sensing and actuation functions and properties like selfhealing or energy harvesting capabilities.
These fluids, that are already available on the market [9,10], are able to modify their rheological properties (viscosity) under an applied electrical or magnetic field.
The sensing elements under consideration for integration into textiles include optical fibers and sensitive fibers, such as those characterized by piezoelectric properties.
In the mentioned study, it appeared that simple safety measures based on conventional partial safety factors for resistance and loads related to an acceptable probability of failure or on a reliability index, as implemented in current design practices, could not be adequate to cope with the generality of the situations encountered in smart structures.
Conventional structural reliability measures can still be applied, and in principle partial safety factors may be reduced for monitored structures only based upon a determination of probabilities for false positive/negative conclusions from the sensor data acquisition (DAQ) logic processing chain.
Online since: June 2011
Authors: Yong Cheng Lin, Yu Chi Xia
The importance of Solder Joint Reliability (SJR) became more emphasized in recent years as a result of two factors: (1) the shift of the semiconductor industry to lead-free solders; (2) the emergence of fine-pitched surface-mount packages that employ hundreds of solder joints for electrical connection.
The material properties of flip chip package were shown in Table 1.
Table 1 Material properties of flip chip package Material Elastic modulus (GPa) Poisson ratio CTE (ppm/) Thermal conductivity () Silicon 131 0.30 2.8 150 Flex substrate 6 0.36 20 393 PCB (FR4) 22 0.28 18 13 Solder (SnAg) E=36.85-0.18×T () 0.4 21.85+0.02039T 51 A non-linear finite element model was made to study the reliability of the typical flip chip assembly, as shown in Fig. 2(a).
For the rigid PCB substrate, the mechanical situation is the same, but because rigid substrate is much stiffer than solder, thus solder joint is deformed instead of rigid substrate.
The selection of different substrate materials could affect solder joint thermal fatigue life significantly.
Online since: February 2013
Authors: Yan Yu, Ning Yu, Sheng Zhe Yu
However, variable fill hydrokinetic coupling has disadvantages of low efficiency, huge waste heat and poor control performance; variable frequency control with higher voltage and power is limited to its behaviors on explosion-proof, heat rejection and harmonic wave pollution; high-price CST system, combined with reducer, is affected by each other, and its maintenance is difficult, though its higher accuracy of regulating speed; hydro-viscous soft starter is independent on reducer but a little expensive.
Fig. 1 Regulating-voltage mechanical properties Fig. 2 Curves of starting with full voltage of three-phase asynchronous motors and ordinary hydraulic coupling Starting with full voltage and ordinary hydraulic coupling The starting mode with full voltage and ordinary hydraulic coupling can start belt conveyors carrying loads and fully use the maximum output torque of a motor.
Fig. 3 Regulating voltage principle of Fig. 4 Curves of starting with reduced fuzzy self-adaptive PID control voltage and ordinary hydraulic coupling Due to viscoelastic belt, frequent surge loads and complex interfering factors, the relationship between speed of a belt conveyor and the voltage of a motor is uncertain.
Starting process Fig. 4 illustrates the starting characteristics of three-phase asynchronous motors’ reduced voltage starting and ordinary hydraulic coupling cooperatively applied to the conveyor belt, where, curves 1, 2, 3 respectively represent three-phase asynchronous motors’ mechanical properties under different input voltage; curvesⅠ , Ⅱ , Ⅲ respectively describe the input features of ordinary hydraulic coupling with different transmission ratio.
Deng, Mechanical and electric drive control, fourth ed., Huazhong University of Science and Technology Press, Wuhan, 2000, pp.62
Online since: June 2013
Authors: Shuai Huang, Xing Hua Zheng, Ze Fei Wei
The pulse electrochemical machining has gotten researchers attention in various countries because it has its own characters and advantages and can solve many problems in mechanical finishing.
The surface obtained by PECF has good surface mechanical property.
However, the products and temperature will increase rapidly if the current density is too large, which would affect the homogeneity of the flow field and surface quality.
The study of the experiment also indicates that, the transformation of the physicochemical property of the gap is different in different frequency range and different range of pulse width.
Generally, the higher the pulse frequency is, and the smaller the duty ratio is, and the stronger and larger the pulse and the transformation of the physicochemical property are.
Online since: May 2018
Authors: Majid Ali, Asad Zia
Incorporation of fibers in concrete composites has the potential to improve these properties of concrete.
The polypropylene fibers (PPF) have the unique properties of chemically inertness and low cost raw materials.
Discussions on the considered properties of PC and PPFRC are made.
The well dispersal of fiber gave better control of cracking to accomplish enhanced durability and improved mechanical properties [8,9].
Artificial fibers can play a vital role in improvement of mechanical properties of concrete.
Online since: November 2009
Authors: Jian Qiu Wang, X.Q. Liu, X.C. Chang, W.L. Hou, Y.G. Zheng
Influence of HVOF Thermal Spray Process on the Microstructures and Properties of Fe-based Amorphous / Nano metallic Coatings X.Q.
The coating microstructure, amorphous phase content and properties under different HVOF processes were evaluated.
Also, the nano phase embedded in the amorphous matrix is advantageous to improve the mechanical properties.
So the oxygen / fuel ratio is also a critical factor affecting coating quality.
The difference of corrosion properties for the coatings sprayed at different parameters is mainly due to the difference in coating microstructure.
Showing 19611 to 19620 of 26166 items