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Online since: January 2021
Authors: Jing Jie Zhang, Ming Dong Yi, Chong Hai Xu, Zhao Qiang Chen, Guang Chun Xiao, Ben Yuan Wang
The mechanical properties of the composites were higher than those of the composites containing micro-scale CaF2, and the fracture toughness of the composites was higher than that of the composites without CaF2.
A12O3 ceramic tool has excellent high temperature mechanical properties and wear resistance, but it is brittle.
Table 7 Table of primary and secondary order of various factors of AT tool Table of primary and secondary order of various factors of AT tool Test index Primary and secondary order Cutting force F ap>fz>v Cutting temperature T ap>fz>v Surface roughness Ra v>ap>fz Table 8 Table of primary and secondary order of various factors of ATC tool Table of primary and secondary order of various factors of ATC tool Test index Primary and secondary order Cutting force F fz>ap>v Cutting temperature T ap>fz>v Surface roughness Ra v>ap>fz As can be seen from Tables 7 and 8, the addition of solid lubricant did not change the order in which the amount of cutting affects cutting temperature and surface roughness.
Thermophysical properties of Cu - matrix composites manufactured using Cu powder coated with graphene.
Effect of nanosized CaF2 on mechanical properties of self-lubricating ceramic material.
Online since: December 2010
Authors: Sasan Yazdani, Amir Sadighzadeh Benam, Behzad Avishan
In many applications the fatigue behavior is one of the most important factors which should be considered because the most parts of machines are susceptible to fatigue fractures.
Variations of these factors affect the KIC which expresses the fatigue behavior of ADI.
Optical and Mechanical Test.
The mechanical properties of austempered specimens at two temperatures of 320 and 400°C are compared in Table 2.
Mechanical properties of austempered specimens.
Online since: June 2012
Authors: Ming Chang Shih, Jen Sheng Shie
However, the performance of this type of bearing is greatly affected by the groove shape during the design process and the type of restrictor.
Consider a steady, we assume that the fluid properties are isotropic, isothermal, isoviscous, and laminar flow.
Hence, we defined three levels variation for the factors , , , and , respectively, listed in the Table 2.
The proposed fitness function can be defined as (5) where , , , and are weighting factors, , .
Table 2 Factors and Levels Levels Factors (mm) 1 4 7 0.2 0.02 2 6 8.5 0.4 0.04 3 8 10 0.6 0.06 Table 3 The Parameters Searching Range Parameters Range Unit 3 ~ 9 7 ~ 10 0.1 ~ 0.7 0.01 ~ 0.07 HTGA/Gray Approach.
Online since: January 2016
Authors: Sergio Lorenzi, Stefano Garlati, Luigi Coppola, Patricia Kara
Acrylates, moreover, can be tailored to attain suitable rheological and mechanical behavior of concrete by modifying the PEO chain.
Materials and methods Concretes with w/c equal to 0.53, consistency class F5 (flow table higher than 580 mm - EN 12350-5) and with a cement factor of 325 kg/m3 were manufactured.
The rheological and mechanical behavior of concrete mixtures was studied at a room temperature of 20°C and at the temperature of 30°C in order to simulate hot climate condition for concrete placing.
Table 1 Physical and chemical compositions of Portland limestone cements Cement L.o.i. 500 °C SiO2 Al2O3 Fe2O3 TiO2 CaO MgO SO3 Na2O K2O Cl CE II / B - LL 32.5 R 0.96 16.59 3.89 1.73 0.12 60.01 2.42 2.67 0.13 0.62 0.02 CE II / A - LL 42.5 R 0.99 19.96 4.21 2.06 0.20 61.61 2.73 2.85 0.12 0.80 0.04 Table 2 Properties of NSF, PCE and blended superplasticizers Properties NSF PCE PNH1 PNH2 Molecular weight (MW) [g/mol] 14000 25000 3000 2000 PDI (MW/Mn) 10 2.3 1.2 1.2 Side chain length [g/mol] 1000 1000 150-1000 Monomer type Ester of acrylic or methacrylic acid Polyamine Polyamine Ionic groups/non-ionic side chains 3.6 3 3 Table 3 Blended superplasticizers Base PNH1 10% 30% 50% 70% 90% NSF 10PNH1/NSF 30PNH1/NSF 50PNH1/NSF PCE 50PNH1/PCE 70PNH1/PCE 90PNH1/PCE Base PNH2 PCE 50PNH2/PCE 70PNH2/PCE 90PNH2/PCE Experimental results and discussion Superplasticizer dosage and air entrapped.
Blended PCE/PNH superplasticizer performances, on the other hand, seem to be more affected by the cement type/class.
Online since: July 2014
Authors: Peng Yi Wei, M.R. Bayati
Surlfur may also undermine the mechanical property of iron-base alloys, and especially degrade their fatigue limit and abrasive resistance significantly, which affects the lifespan of iron-base alloys.
However, limited by many factors such as blank, instrumental sensitivity, and lack of low sulfur standard samples, sulfur detection has long been the subject of the exploration for years.
Jiang Qicui [3] discussed the factors to affect the detection repeatability and accuracy, when conducting detection of trace sulfur in steel by using high frequency combustion infrared absorption method.
Jiang Xiumei et al. made research on the influential factors of coulometry method for detecting sulfur, and proposed corresponding optimization method.
[26] Li Yuangui, Liu Yuying, Zhang Ping.Shangdong Mechanical[J], 2000, 36(3):37-38
Online since: October 2011
Authors: Yi Zhang, Yong Liu, Jiang Feng, Bao Hong Tian, Yong Wei Sun
Powder metallurgical Mo-Cu alloys exhibit excellent physical property, high thermal and electrical conductivity, low and alterable thermal expansion coefficient, etc.
The mechanical properties of these alloys are affected by the composition, strain history and the microstructure resulting from the thermo-mechanical treatment imparted before the final use[6].
The Zener-Hollomon parameter is the strain rate factor which is compensated by temperature.
Online since: August 2016
Authors: Josef Meinhardt, Hannes Grass, Marion Merklein, Sebastian Kreissl, Christoph Amann
Besides the three mentioned main sources of process-induced distortions, several additional influencing factors have been considered.
Among these influencing factors, a gradient in fibre volume fraction seems to be most critical, since almost all effective laminate properties are affected.
They took only laminate properties and tool-laminate interface effects into account.
It is assumed that the described deviations are mainly caused by resin properties not captured accurately enough yet.
DuBois, Properties & limits: Review of shell element formulations, in: Developer Forum, Filderstadt, 2013
Online since: February 2007
Authors: Qing Li Ren, Qiang Luo, Wei Chen
Their practical use requires the following properties: avoiding short-circuits between neighboring wires, producing a minimum of toxic gases and dark smoke during pyrolysis, and keeping good mechanical properties.
KT Ea Aek − = (5) where A is the former factor and Ea is the apparent activation energy.
And because the crystal embryo of the Mg,Al-hydrotalcite produced instantaneously is less than 10 nm (See Fig.2(a)), the shape of the crystal embryo can be supposed to be spherical after we add the factor of shape rectify b.
And this is due to the reason that the less the Mg,Al-hydrotalcite grain, the less affecting of the shape rectify factor b based on the assumption that the grain is the round shape; (3) With prolonging the reaction time, the gap between the theory curve and the experimental curve is increased.
And the reason is as follows: 1) the concentration C0 of the reaction liquid is changed a lot after reacting a long time; but we suppose that A value, which is also decided by C0, is a constant when we draft the theory curve; 2) the longer the reaction time, the greater the Mg,Al-hydrotalcite grain size, the more affecting of the shape rectify factor b on the calculation of grain size.
Online since: September 2013
Authors: Joanna Strug
Both UML and OCL, while typically related to software, may be used also for modeling systems from other engineering subject areas, such as electrical or mechanical engineering.
A class diagram is the UML main building block that shows, at an abstract level, elements of the developed system, their properties and operations – thus it possess the capacity to reflect effectively the structure of the system.
Mutation operators are key elements in mutation testing, as the number of mutants they generate and the quality of these mutants affect the process, costs and the results of mutation testing.
Data collected during the experiment were used to calculate, for the evaluated mutation operators, their contribution factors (CF), mutation scores (MS) and impact indicators (II).
However, the results seem also to suggest that some of these operators may be rejected without affecting depreciatingly the mutation testing, while other should always be applied.
Online since: November 2005
Authors: Do Won Seo, Jae Kyoo Lim, Jun Yong Choi
Several studies have verified that moisture can modify the mechanical properties of some reinforced polymers [11-17].
The purpose of the present work was to examine the influence of water absorption on the mechanical properties of carbon fiber reinforced polymers.
Two kinds of test were performed in the dried samples in order to determine the influence of the water absorption cycles on the mechanical properties following the ASTM D 638-90 and D 5045-96.
Mechanical properties are dramatically affected by the water absorption cycles.
Newman: Composite materials technology processes and properties (1990), p. 237 [10] D.C.
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