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Online since: June 2020
Authors: Leslie Joy L. Diaz, Gianina Martha A. Tajanlangit
Fiber morphology is heavily affected by both solution properties and processing parameters.
The two factors both affect the electric field generated in the set-up; increase in voltage increases the electric field while increase in tip-to-collector distance decreases the electric field.
The voltage effect and the interaction between voltage and tip-to-collector distance are the significant factors that affect the size of beads with p-values of 0.0088 and 0.0135, respectively.
At the settings chosen for the study, interaction effects between factors prevailed.
Huan et al., Effect of experimental parameters on morphological, mechanical and hydrophobic properties of electrospun polystyrene fibers, Materials, Vol. 8 No. 5 (2015), 2718–2734
Online since: July 2014
Authors: Martin Keppert, Kirill Polozhiy
Nevertheless after a treatment such ashes can have properties relatively comparable with coal fly ashes and thus can be used as Supplementary Cementitious Material (SCM).
It can be concluded that water extracted MSWI fly ash can be used as 10 % Portland cement substitute without loss of mechanical properties.
The specimens of mortars (160x40x40 mm prisms) were stored in water for 7, 28 and 90 days and then its bending and compressive strength was measured (ČSN EN 196-1).The influence of thermal load on mechanical properties of mortars was examined by means of measurement of residual compressive and bending strength; the thermal load was realized by heating of 28 days cured samples in a laboratory oven for 4 hours at given temperature.
Another process influencing the residual properties is thermal expansion of aggregate particles; especially the quartz crystal modification transition at 573 °C is understood as an important factor reducing the strength of materials containing quartz.
Konvalinka, Basic and Hygric Properties of Concrete Containing Fine Ceramic Powder, Advanced Materials Research 897 (2014) 188-191
Online since: March 2024
Authors: Sroisiri Thaweboon, Boonyanit Thaweboon, Supaporn Mala, Ratchaporn Srichan
Various agents were added to artificial saliva to improve its properties.
They supply the main functions of removing damaged cells, and pathogens, and secrete growth factors and proteins that attract the arrival of relevant cells, such as fibroblasts and endothelial cells, to the injured area.
Hyposalivation factors include the presence of glandular or systemic diseases, aging, and the use of some drugs such as antihypertensives, diuretics, antihistamines, anticholinergics, and anxiolytics.
In addition, the attributes of cells implicated in tissue regeneration in the oral mucosa are unique and have some properties of fetal cells [2].
Saliva is a complex fluid that affects oral health by means of specific and non-specific physical and chemical properties.
Online since: January 2014
Authors: Xi Kang Yan, Xia Zhou
Research on Mechanical Properties of Reinforced Concrete (RC) Beams for the Corrosion by Sea Water Zhou Xia1,YAN Xi-kang2, 1.Hebei Electric Power Design & Research Institute, Shijiazhuang 050031,China 2.School of Civil Engineering, Hebei University of Technology, Tianjin 300072,China Keywords: reinforced concrete beam; sea water corrosion; bearing capacity; Abstract: By way of the soaking and drying cycle test on the different mix proportions vertical section of 10 pieces of RC beams suffered artificial sea water(ASW) corrosion under0,35,70,105,140 times of dry-wet cycles, the compared result of exerting pressure test of these beams under simply supporting were investigated.
The law about the changes of the mechanical performance for RC beams with different mix proportions under different time periods for suffering corrosion of dry-wet cycles was as follows: The resistibility to ASW corrosion for the concrete specimens with various water cement ratio(various initial strength) are different;The characters of normal section failure for RC beams attacked by sea water are about the same as that for ordinary RC beam; Along with the extension of the time for seawater attack, the bearing capacity for normal section of RC beams varies wave upon wave.
Introduction The RC structures in the wave splash area are easier to be subjected to destroy and the loss is vast[1,2].In this experimental result, the law for the change of mechanical performance of RC beams with different mix proportions under different dry-wet cycle conditions was investigated through artificially imitated sea water corrosion on the in-site casting RC beams especially on the concrete structure in the wave splash area.
These specimens were cured and dried under the same condition as the experimental beams. 2.3 the Procedure for Eroding Experimental Beams According to relevant research result, it is possible to simulate the real eroding situation affected by natural environment with the aid of seawater spraying test.
Corroded Expansion Force of Reinforced Concrete Members and Its Influence Factors.
Online since: September 2007
Authors: Rui Chen Yang, Z. Li, Kui Chen
The heat strength parameter Pc was proposed as one property of materials, and heat processing factor P as temperature-time processing parameter.
However, for the effect of temperature, stress and corrosion in service for a long-term running, the materials will progressively deteriorate, leading to the degeneration of microstructures, the weakening of mechanical properties and eventual creep damage and rupture.
Under the case of known C-value in LMP, the behavior of pearlitic heat-resistant steels at elevated temperatures can be evaluated, including microstructures, properties and the prediction of running life.
And different chemical composition and interatomic environment in heat resistant steels will affect not only bond energy and bond strength between atoms, but also the atomic vibrating frequency and C value.
Conclusions From the Larson-Miller parameter with the present determined C values (20.62 for 12Cr1MoV and 20.30 for 15CrMo), the degradation analyses of both microstructures and mechanical properties of 12Cr1MoV and 15CrMo all show good accuracy and suitability.
Online since: October 2013
Authors: Wojciech Zębala, Robert Kowalczyk
Sintered carbides with cobalt, as metal binder, with good properties of abrasion resistant in high temperature environment are used as construction material.
The mechanical properties depend on amount of WC in the material structure, grain size of WC and the amount of metal binder in the material structure [5-6].
Projects, which performance depends on many factors should apply a statistical technique in experiments, introduced in the 1920s by Ronald A.
F-test value at 95% confidence level is used to decide the significant factors affecting the process and percentage contribution is calculated.
The properties of work piece material (WC) are as follow: • density 13 g/cm3, • hardness HV10 equals 950, • hardness HRA equals 85.4.
Online since: October 2010
Authors: G.S. Geng, Jiu Hua Xu, B. Y, S.N. Galyshev
It is well known for its outstanding mechanical properties such as high strength and corrosion resistance, particularly at elevated temperatures.
On the other hand, Inconel 718 is also known to be one of the most difficult-to-cut materials, and the properties responsible for the poor machinability of it are as follows [1-3].
A major part of Inconel 718's strength is maintained during machining due to its high-temperature properties, resulting in a large cutting force.
The factors and levels of different cutting tools are shown in Table 4.
When machining Inconel 718 with cermet tools, cutting speed is the most influential factor that affects the surface roughness, followed by the depth of cut.
Online since: June 2014
Authors: Khairil Anas Md Rezali, Michael J. Griffin
Griffin Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, SO17 1BJ.
This study investigated the effects of material dynamic properties on the transmission of vibration to the palm of the hand and to the fingers.
Because the transmissibility of a glove depends on the dynamic response of the hand, factors that affect the dynamic response of the hand affect the transmissibility of materials to the hand.
The dynamic properties of a glove also affect the transmissibility of a material to the palm of the hand [8, 11, 13, 15].
The effects of material dynamic properties on the transmission of vibration to the finger have yet to be investigated.
Online since: August 2014
Authors: Mei Hong Liu, Xi Chen Yuan
Binder Latex as binder in the non asbestos gasket, his role is to combine various components, provides the material fluid resistance and compression resilience, gasket is heat resistance, resistance to medium, sealed performance is one of the important factors.After considering I selected the nitrile rubber latex, carboxyl nitrile latex.Nitrile latex or NBR, carboxyl nitrile latex abbreviation XNBRL, they with fiber can be a combination of good performance compared to other latex with heat resistance, oil resistance, abrasion resistance, aging resistance, but its tensile properties is bad.
Table 1 The principle of non asbestos gasket Fiber Packing Binder Cooperate with the agent Aramid Wood pulp Mineral wool Calcined kaolin Talcum powder Mica XNBRL NBR-26 Sulfur Al2(SO4)3 Formula In order to get the required properties of the material, the need to establish a basic formula here, on this basis) to get better performance.Here we used the orthogonal test, the ratio of raw material for the design.Because there are 4 main influential factors on the performance required, so choose the L9 (34) orthogonal test table.Table 2 for the selected factors and levels, the orthogonal test table listed in table 3 and table 4 for the relationship between the factors and levels; Table 2 Test factors and levels The level of A- Fiber /% B- Packing /% C- Binder /% D- Cooperate with the agent /% 1 40 25 13 0.8 2 45 30 15 1.0 3 50 35 17 1.2 Table 3 Orthogonal table The serial number A B C D Creep relaxation rate /% 1 1 1 1 1 36.25 2 1 2 2 2 40.60 3 1 3 3 3 50.63 4 2 1 2 3 37.80
Table 4 The foundation of the non-asbestos gasket materials formula (mass fraction) Fiber Packing Binder Cooperate with the agent 50 25 13 1.2 Summary After experimental research, found on the basis of non asbestos latex copy take gasket packing for non asbestos latex copy of gasket strongest influence of creep, the influence of the binder on the followed, with minimal impact on the agent.In view of this current study alone in here creep properties of the optimal basic formula: fiber is 50%, 25% filler, binder, 13% 1.2% chelating agent.
Mechanical engineering material, on May 31, 2007 (5) [2] Mei-hong liu, Cai Renliang su-jiang xie, Meng Feng have, dong-mei tian.
Mechanical engineering material, in January 2005, 29 (1) [3] Emerging in the summer, ho ngoc ha.
Online since: August 2015
Authors: Igor Yadroitsev, Ina Yadroitsava, Ivan Zhirnov
Temperature gradient determines the microstructure and mechanical properties of the SLM part, so studies about temperature fields are primarily important.
The temperature is one of the key parameters which define properties of matter, phase transitions, the rate of chemical reaction, microstructure of sintered material and mechanical properties of produced SLM object.
All properties of the material were temperature-dependent (Fig. 1).
Kruth, Determination of geometrical factors in layerwise laser melting using optical process monitoring, Opt.
Mills, Recommended values of thermophysical properties for selected commercial alloys.
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