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Online since: March 2008
Authors: Yoon Suk Chang, Jin Ho Lee, Young Jin Kim, Hae Dong Chung, Kwang Won Seul, Shin Beom Choi, Young Jae Park, Jae Boong Choi
Then, the cumulative usage factor as well as stress intensities at critical locations of the pressurizer are calculated and compared with corresponding allowable design stress limits.
Finally, after categorizing the stress component, stress intensities and cumulative usage factors at critical locations of the pressurizer are calculated through main finite element analyses and compared with corresponding allowable design stress limit.
However, it is well-known that the finite element analysis results can be affected by the element type and mesh pattern.
Fig. 4 shows the resulting cumulative usage factors at representative critical locations such Cuts 1, 4, 5, 14 and 101, which ensure soundness of the modular pressurizer against failure due to fatigue.
I Design stress intensity values, allowable stresses, material properties, and design fatigue curve (1998)
Online since: March 2008
Authors: Muhetaer Kelimu, Marc Thiriet
Besides, the duct walls are currently assumed to be rigid due to the lack in knowledge on rheological properties of the solid walls, either in the normal state or in the pathological state.
Even in static condition, ECM features affects cell adhesion and spreading, differentiation, migration, and apoptosis.
They augment the activity of transcription factors, such as activator proteins AP1 and AP2, cAMP response element, early growth response protein EGR1, and NFκB, with a magnitude which depends on the cell type (on the vascular region).
Receptor serine/threonine kinases (RSTK) and umor necrosis factor receptors (TNFR) control the cell fate.
PoG: proteoglycan, NOx: NAD(P)H oxidase, NFAT: nuclear factor of activated T cells.
Online since: April 2004
Authors: Sang Ll Lee, J.O. Jin, Akira Kohyama
properties of RS-SiC based materials.
The decrease of starting SiC particle size for the preparation of C/SiC complex slurry will affect the microstructure and the mechanical properties of RS-SiC based materials.
In the present study, the microstructure and the mechanical properties of monolithic RS-SiC and RS-SiCf/SiC materials are investigated.
The three point bending test was conducted to investigate the room temperature mechanical properties of all materials.
Especially, the mechanical properties of Hi-Nicalon/SiC composites were evaluated at elevated temperatures of 1000 � and 1300 �.
Online since: November 2007
Authors: Dong Hui Wen, Bing Hai Lv, Ju Long Yuan, Cong Rong Zhu, Qin Xu
To obtain the amorphous alloy films with superior properties by method of electrochemical deposition, the accuracy requirement for the copper substrates for Alloy Films is extraordinarily strict.
The two above factors heighten the workpiece material removal rate.
The lapping velocity mainly affects the workpiece deformation velocity in the lapping machining to modify the machined surface for the physical and mechanical properties.
But the increasing lapping velocity has a little effect upon the surface roughness which depends on the properties of the abrasive grain and lapping pad.
The polishing pad made of polyurethane has superior properties such as strong wear resistance, high polishing efficiency and small deformation, but the requirement for the surface roughness is strict.
Online since: August 2015
Authors: Trevor A. Dean, Nan Li, Jian Guo Lin
The mechanical properties of martensitic boron steel, achieved through conventional press hardening processes, are well known and usually provided as product information by steel suppliers.
Due to the potential advantages of parts with tailored mechanical properties, interest in forming hot stamped boron steel with non-uniform microstructure has arisen.
With respect to this work, since boron steel with different phase states are heat treated from the same initial microstructure, and subjected to the heating rate and soaking time, variations in morphological factors can be neglected [10].
High Strain Rate Properties of Hot Formed Die Quenched Boron Steel.
Grajcar, Heat treatment and mechanical properties of low-carbon steel with dual-phase microstructure.
Online since: September 2019
Authors: Anton Sergeevich Tsvetkov, Irina Vladimirovna Teplukhina
It should be noted that the reliability and durability of the reactor pressure vessel and its internals under operating conditions is determined not only by the average level of physical and mechanical properties of the steel, but also by the homogeneity of these properties in the entire volume of metallurgical blanks [3-5].
At the same time, there is an acute problem of ensuring the homogeneity of properties in the production of billets from large ingots.
This can affect the technological ductility of steel, as well as have a significant impact on the formation of the grain structure and mechanical properties [10,11].
Microhardness in the Initial and after Homogenization States Measurement Since the liquation homogeneity affects the mechanical properties of the metal, in particular, the microhardness values should differ after homogenizing annealing.
Shaposhnikov, Effect of production factors on main oil pipeline pipe metal property formation, Metallurgist. 62(7-8) (2018) 766-771.
Online since: February 2014
Authors: Hai Yan Yin, Chun Cheng Zuo, Yan Xin Cao, Da Yi Yang
In this article, we deduced microparticle clustering in Z and X direction Coordinate equation, discussed in detail the various factors influencing particles equilibrium position in the liquid medium.
Separation of particles is directly affected by external forces.
Through the analysis of stress and motion of particles, the different particles are in different equilibrium positions; the influential factors of the equilibrium position will be analyzed and discussed in detail in this paper.
Particles of different property will gather at different heights.
Summary In this paper, we study the aggregation behavior of particles in a fluid medium, discussed in detail the various factors influencing the particle mechanical movement particulate matter - tiny particles in the liquid medium.
Online since: May 2012
Authors: Yu Feng Li, Shi Fu Zhu, Yun An
Introduction Natural graphite is flake shaped solid widely used in the metallurgical, mechanical, electrical, chemical, textile, defense, nuclear power industry and other fields for its unique mechanical properties.
The structure and properties of synthetic materials can be improved under microwave heating.
The table.1 shows the main factors of experimental test Table1 Factors and levels Pressure/MPa Time/min Power/W 1 0.5 15 400 2 1.0 20 600 3 1.5 25 800 4 2.0 30 1000 Results and Discussion The improvement of purification after the introduction of the microwave field The sample is purified in the microwave digestion instrument and the condition are listed as following: the acid mixture with proportion of HCL/HNO3 is 1:1,the reactor tank pressure is 1.0Mpa, irradiation time is 25minutres and the microwave power is 800W respectively.
During the process of microwave radiation, the pressure occupied the controlling factor.
Microwave Synthesis and Electrochemical Property of One Dimensional Nanostructured MnO2.
Online since: December 2011
Authors: Xu Wang, Yu Xin Dong, Yong Jie Wang, Xiao Peng Xu, Si Chen, Yan Qin Shi, Jia Yuan Shen, Xiang Bin Xu
Introduction Some defects such as low distortion temperature and brittleness of PA6 have limited its application, so many researchers tried to improve these properties [1].
Furthermore, the mechanical properties of PA6 based ternary composites are determined by many factors, such as: blend route, kinds and contents of elastomers, inorganic fillers type, surfactant categories and dosages, dispersion degree of additive component, et al [2-8].
Wang [10] and co-workers prepared wollastonite which coated with nano-aluminium silicate and applied it into PA6 as fillers, the results suggested that the mechanical properties and the heat distortion temperature of the PA6 composites filled by it were notably enhanced.
Mechanical measurement.
Table 1 The surface area of the three kinds of CaCO3 calculated by BET Name ground CaCO3 spherical CaCO3 needle-shaped CaCO3 Specific surface area [m2/g] 1.87 10.57 15.84 a b c Fig. 1 SEM micrograph of the CaCO3 particles: (a) ground CaCO3 (b) spherical CaCO3 (c) needle-shaped CaCO3 Fig. 2 Impact strength of PA6 based composites Mechanical Properties.
Online since: September 2013
Authors: Teng Fei Sun, Qing Zang, Qing Sheng Hu, Xiao Feng Han, Teng Fei Wang, Chun Qiang Shao, Hui Chen, Jian Hua Yang, Ai Lan Hu, Ya Dong Li
In order to study the physical properties of magnetic confined plasma and the mechanism of various complex plasma phenomena, a lot of plasma diagnostic systems were built around the Tokamak device.
On one hand, due to long mechanical structure of baffle actuator, it has a relatively large load inertia which affects its property of starting and stop.
This feature guarantees the safe and smooth running of baffle mechanical system.
Firstly, the effective thread pitch is not exactly 2.5[mm] and it needs to be calibrated by laser level carefully before positioning, because of the influencing factors like deviation of manufacture and installation, as well as the vibration of whole baffle actuator.
We move the baffle plate up and down repeatedly to explore the most perfect parameters configuration like load inertia ratio, properties of acceleration and deceleration, maximum output torque, slight vibration suppression control, etc. in order to ensure baffle mechanical actuator could operate stably and smoothly.
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