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Online since: September 2013
Authors: Ismail Gerdemeli, Eren Kayaoglu, Adem Candas, Serpil Kurt
Afterwards, material properties of St 52 steel were set up in the program.
In the study, C2A-06-062LW-350 strain gage which has 2.125 ± %0.5 gage factor at 240C and produced by Vishay Micro-Measurement was used.
When the crane dead load and test load (21280 kg) affected to the structure, stresses increased normally.
Safety factor (n), which is the ratio of the yield point of the material to maximum stresses on structure, must be minimum 1.30.
Higher safety factors also means for special requested designs entails extra efforts and materials.
Online since: December 2013
Authors: Ke Hui Qiu, Hao Quan, Rong Chen, De Ming Huang, Jin Yan Liu
The experiment result shows that the tri-modal microstructure could obtain high damage tolerance properties of titanium alloy in theory.
As heat preservation prolonged, grain will be distributed uniformly in the alloy, grain surface tension will decrease, making a stable state for grain, and the influence of dynamic factors will also decrease gradually.
(3) The tri-modal microstructure could meet high damage for tolerance properties of titanium alloy in theory.
Effect of Treatment on the Microstructure and Properties of TC18 Titanium Alloy Wire.
The relationship of heat treatment-microstructures-mechanical properties of the TC18 titanium alloy.
Online since: October 2012
Authors: Erween Abdul Rahim, Z. Mohid, K.C. Mat, M.F.M. Jamil, R. Koyasu, H. Sasahara
Introduction Carbon fiber reinforced polymer (CFRP) has make an interest worldwide for its lightweight and excellent engineering properties in the form of high modulus and high strength fiber.
Nowadays modern CFRP are made up by composite engineered materials that made from two or more constituent materials with significantly different physical or chemical properties which remain separate and distinct on a macroscopic level within the finished structure [1].
Dry machining conditions were employed due to the effect of coolant to the properties of the CFRP.
Delamination Factor, Fd.
The value of delamination factor (Fd) can be calculated by using Eq.1.
Online since: January 2018
Authors: Myroslav Sanytsky, Tetiana Kropyvnytska, Taras Kruts, Oleksander Horpynko, Iryna Geviuk
Like other pozzolanic materials, replacement of cement by natural zeolite can improve the mechanical properties of cement and concrete composites.
The optimization of multi-component cements CEM II/B-M containing 65 mass.% CEM I 42,5R and 35 mass.% of mineral additives was determined due to plan of two-factor three-level experiment.
This in turn affects the ultimate compressive strength, the permeability and chemical durability of quaternary zeolite-containing Portland-composite cements significantly.
The lowering clinker factor ratio in CEM II/B-M (S-P-L) 32,5 R reduces the CO2 discharge in the cement production process 1.46 times/ 1 ton cement.
Conclusion The rheological properties of the strength development of Portland-composite cement CEM II/B-M (S-P-L) improve and its density increase due to the following factors: 1) the optimization of the particle size distribution of the constituents using the values of incremental coefficient of surface activity, 2) the effect of the hydraulic properties of the GBFS combined with the pozzolanic action of the zeolitic tuff, 3) the filling effect of the finely dispersed limestone powder, 4) the reduction in the clinker factor.
Online since: April 2014
Authors: Zhao Min Lian
Introduction Electrical equipments are easy to be influenced by human factors, equipment factors and environmental factors in the process of operation, if human operate them incorrectly, misope- ration can make the equipments unable to run normally, or even cause safety accidents, threat directly to the people life and property safety.[1-2]Therefore, the enterprise must pay attention to the electrical faults, and take some feasible measures, timely deal with electrical faults, reduce potential risk.Electrical faults are differences owing to the different type or model of loom, common electrical faults and positions are shown in Table 1.
The higher frequency of irregular broken weft certainly belongs to the mechanical problems, the poor weft transmission can be caused by weft tube, guide hole or all parts in contact with weft.
In electrical ways, in the process of a complete weft insertion, the existence of the weft is detected by the weft sensor, when driving in the sensor probe holes, weak mechanical vibration generated by sliding, sent “with weft”signal ensure machine running through the machine - electric conversion and amplification.
Loom starting circuit with several buttons, parallel connection, contact for normally open contacts, if one cannot conduct, this is not enough to affect all button, they can be transposed to check, but the stop button is a normally closed contacts in series, loom can't run if there is a fault.
The brake clearance is too large or brake weakness all can cause the parking does not reach the designated position; Brake weakness can be casued by mechanical faults, aslo may be due to electrical fault.
Online since: September 2011
Authors: Bao Qi Zuo, Yao Xing Jiang, Jin Fa Ming
UV radiation is one of the major causes of natural aging of textile materials [5], especially B.mori silk fiber easily happening aging phenomenon, resulting in yellowing and other properties loss, such as luster, mechanical property, thermal property, and amino acid contents, etc.
Mechanical Properties Analysis.
The UV irradiation leads to fiber breakage in the sample surface and, consequently, there is loss in mechanical properties especially in breaking strength.
This result confirms again the mechanical degradation described previously in the mechanical properties analysis summary.
In addition, this surface phenomenon during natural and accelerated aging process affects mechanical property and amino acid contents.
Online since: February 2020
Authors: Najat A. Alghamdi
Recently, improvements in nanotechnology have led to the development of nano-electro-mechanical systems (NEMS) such as nano-mechanical resonators.
They added a factor in their formula of thermoelastic damping K=(1+υ)(1-2υ) which is different from that of Lifshitz and Roukes [12], in which υ is Poisson's ratio.
Kidawa [14] studied the effects of internal and external damping on transverse vibrations of a beam induced by a free heat source by using the properties of the Green functions.
Rahmani et al. discussed the buckling and free vibration of shallow curved micro/nano-beam based on strain gradient theory under thermal loading with temperature-dependent properties [20].
Golmohammadi, Buckling and free vibration of shallow curved micro/nano-beam based on strain gradient theory under thermal loading with temperature-dependent properties, Applied Physics A, 123 (2017) 4
Online since: October 2011
Authors: Shuo Wang, Quan Yuan, Xin Ye, Hua Cong
China 2 School of Mechanical Engineering, Shandong University, Jinan 250061, P.
On Fixation I, the stress concentration mainly appears in the belly, on Fixation II, stress concentration mainly occurs in the attachment edge, which can affect the long term durability of leaflets.
The Fixation I contribute to better mechanical behavior of leaflet, which may has a significant effect on the long term durability of the value.
The ELV is superior to the CLV in mechanical properties.
Li, Geometrical Stress-Reducing Factors in Anisotropic Porcine Heart Valves, Journal of Biomechanical Engineering, vol.125, pp.735-743, 2003
Online since: September 2012
Authors: Jun Wang, Cui Lian Che, Chuan Zhen Huang, Zhe Lv, Hong Tao Zhu
A 3D simulation on fluid field at the impact zone of abrasive water jet under different impact angles Zhe Lva, Chuanzhen Huangb , Jun Wangc, Hongtao Zhud and Cuilian Chee Center for Advanced Jet Engineering Technologies (CaJET), Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University, Jinan, China, 250061 alzjslyz@126.com, bchuanzhenh@sdu.edu.cn, cjun.wang@unsw.edu.au, dhtzhu@sdu.edu.cn, echecuilian@163.com Keywords: abrasive water jet, simulation, CFD, impact angle Abstract.
Li’s research results [6] show that the incidence angle and water pressure are the main factors affecting the removal rate and surface roughness, which are the most important indicators of polishing performance.
The properties of these materials can be found in the software’s database.
Hence it may be drawn that the incoming jet velocity component perpendicular to the workpiece surface is the main influential factor on the pressure value on the impacted surface.
The maximum pressure value on the impacted surface is decreased as the impact angle varies from 90°, 60° to 25°, depending on which it can be inferred that the perpendicular velocity component of the fluid is the major influential factor of the pressure on the impacted surface.
Online since: May 2013
Authors: Ying Shuai Zhang, Hui Shen, Ming Feng Xu, Yun Yi Tao
This mechanical pre-dedusting method could remove 40% of the dust in design.
So, it’s obvious that PPS textile mechanical properties (tenacity and tensile strength) were already distinctly reduced.
In flue gas at the deduster’s inlet, several affecting factors have great influence on the operating life of PPS filter bag as flue gas temperature, humidity, and components.
PPS filter bags broken in application is a common and complicated problem, and is concerned with such aspect factors as physical and chemical reasons.
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