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Online since: August 2008
Authors: Saeed Daneshmand, A. Ahmadi Nadooshan, C. Aghanajafi
2) Did the FDM new material has the mechanical characteristics, strength, and elongation
properties enquired to survive wind tunnel testing at subsonic, transonic, speeds and still produce
accurate data?
Figure 2 show the model tested FDM .The material properties of AISI 1045H (CK45) and ABSi are shown in Table 1 and Table 2 [5].
Table 1 Material properties of AISI 1045H Mechanical Properties Units AISI 1045H -(CK45) Yield Strength Tensile strength Elongation at Break Mpa Mpa Percent 310 565 16 Table 2 Material properties of FDM- ABSi Mechanical properties Units Test Method FDM-ABSi Tensile Strength Tensile Modulus Tensile Elongation Flexural Strength Flexural Modulus Mpa Mpa Percent Mpa Mpa ASTM D638 ASTM D638 ASTM D638 ASTM D790 ASTM D790 37 1,915 3.1 61 1,820 Wing-body-tail configuration The geometry used for the study was that of a wing-body-tail configuration concept [6].This configuration would indicate possible deflections in the wings or tail due to loads and whether the manufacturing accuracy of the airfoil sections would adversely affect the aerodynamic data that resulted during testing.
Each of these factors will be considered separately.
Adelnia, "Rapid Prototyping in Wind Tunnel Testing", 13th Annual (International) Mechanical Engineering Conference, ISME2005, Isfahan University of Technology, Isfahan, Iran, May 2005,pp350-357
Figure 2 show the model tested FDM .The material properties of AISI 1045H (CK45) and ABSi are shown in Table 1 and Table 2 [5].
Table 1 Material properties of AISI 1045H Mechanical Properties Units AISI 1045H -(CK45) Yield Strength Tensile strength Elongation at Break Mpa Mpa Percent 310 565 16 Table 2 Material properties of FDM- ABSi Mechanical properties Units Test Method FDM-ABSi Tensile Strength Tensile Modulus Tensile Elongation Flexural Strength Flexural Modulus Mpa Mpa Percent Mpa Mpa ASTM D638 ASTM D638 ASTM D638 ASTM D790 ASTM D790 37 1,915 3.1 61 1,820 Wing-body-tail configuration The geometry used for the study was that of a wing-body-tail configuration concept [6].This configuration would indicate possible deflections in the wings or tail due to loads and whether the manufacturing accuracy of the airfoil sections would adversely affect the aerodynamic data that resulted during testing.
Each of these factors will be considered separately.
Adelnia, "Rapid Prototyping in Wind Tunnel Testing", 13th Annual (International) Mechanical Engineering Conference, ISME2005, Isfahan University of Technology, Isfahan, Iran, May 2005,pp350-357
Online since: September 2013
Authors: Winarto Winarto, Eddy S. Siradj, Dedi Priadi, Triyono Triyono
However, from the study of literature, the papers discussing study the effect of jatrophacurcas on the physical properties of recast layer in cutting of steel, has never been obtained so far.
Electric current for each electrode selected in optimum cutting conditions as recommended by the engine manufacturer.Optimum conditions for Copper and Copper Chrome are the same, that is: 10, 15, 20, 30, 45, 60Amperes, while for graphite electrode: 6, 9, 15, 20, 30, 40 Ampere.In addition, the use of pulse-on time and pul se-off time are constant, the duty factor of 85% with a flushing injection.
Figure 2Comparison of TWR affected by dielectric fluid kerosene and jatrophacurcas for graphite electrodes.
Figure 3.Comparison of TWR affected by dielectric fluid kerosene and jatrophacurcas for Cu and CuCr electrodes.
Acknowledgments The authors wish to thank the postgraduate students from the study program of Metallurgy and Materials, the University of Indonesia, and the study program of Mechanical Engineering,Trisakti University, who have helped the implementation of this study.
Electric current for each electrode selected in optimum cutting conditions as recommended by the engine manufacturer.Optimum conditions for Copper and Copper Chrome are the same, that is: 10, 15, 20, 30, 45, 60Amperes, while for graphite electrode: 6, 9, 15, 20, 30, 40 Ampere.In addition, the use of pulse-on time and pul se-off time are constant, the duty factor of 85% with a flushing injection.
Figure 2Comparison of TWR affected by dielectric fluid kerosene and jatrophacurcas for graphite electrodes.
Figure 3.Comparison of TWR affected by dielectric fluid kerosene and jatrophacurcas for Cu and CuCr electrodes.
Acknowledgments The authors wish to thank the postgraduate students from the study program of Metallurgy and Materials, the University of Indonesia, and the study program of Mechanical Engineering,Trisakti University, who have helped the implementation of this study.
Online since: September 2013
Authors: Ping He, Xian Qiang Qu, Yao Guo Xie, Hong Bin Cui
There are many ways for the isolator can be used to represent an inner friction or energy loss of elasticity - damping properties of the materials, a widely used description method is complex stiffness[3].
System is assumed to be viscoelastic structural damping, the input signal is a harmonic signal, mechanical model of the test system (SDOF) shown in Fig. 3, the equations of motion according to Eq. 2
(2) Where, M is the quality of moving objects in the system, K is the static stiffness of elastic element in the system, ηis the loss factor of the viscoelastic damping structure is twice the damping ratio, X is the absolute displacement of moving objects, is the absolute acceleration of the moving object, u is the absolute displacement of the foundation or countertops, F0 is the amplitude of excitation, ω is the circular frequency of excitation.
Fig. 3 Mechanical model of the system Fig. 4.
Zhao: Mechanical Vibration and Noise (Science Press, China 2004).
System is assumed to be viscoelastic structural damping, the input signal is a harmonic signal, mechanical model of the test system (SDOF) shown in Fig. 3, the equations of motion according to Eq. 2
(2) Where, M is the quality of moving objects in the system, K is the static stiffness of elastic element in the system, ηis the loss factor of the viscoelastic damping structure is twice the damping ratio, X is the absolute displacement of moving objects, is the absolute acceleration of the moving object, u is the absolute displacement of the foundation or countertops, F0 is the amplitude of excitation, ω is the circular frequency of excitation.
Fig. 3 Mechanical model of the system Fig. 4.
Zhao: Mechanical Vibration and Noise (Science Press, China 2004).
Online since: October 2010
Authors: Wen Jie Fan
Introduction
Acoustic loads and boundary layer turbulence are transformed into mechanical vibrations in the
launch vehicle, which affect the spacecraft at its base[1].
Material properties of 3A21 Al alloy is showed in Table 1[3].
In order to reflect the real structural properties of these materials, a stress-concentration factor K must be included in the evaluation of the exponent b.
The sufficient safety factor can ensure safety for the environment.
Finally two ribs were added at each flange base for decreasing the stress concentration factor.
Material properties of 3A21 Al alloy is showed in Table 1[3].
In order to reflect the real structural properties of these materials, a stress-concentration factor K must be included in the evaluation of the exponent b.
The sufficient safety factor can ensure safety for the environment.
Finally two ribs were added at each flange base for decreasing the stress concentration factor.
Online since: September 2013
Authors: Yu Hai Xu, Yu Ping Zhao
The development of new materials is to support the technology rapid development of one of the factors, make the material surface functionalization of compound, improve, and high strength of the innovation of the new material is research and development of the ing, lubrication, corrosion resistance, heat most looking forward to.
If metal organization toughness is insufficient easy generation surface layer under the action of shear stress cracks and peeling, influence of the composite material multi-layer anti-wear properties.
Metal Matrix of Material Mechanical Properties Table 2 45Mn Mechanic Performance σb(Mpa) σs(Mpa) δ5(℅) ψ(℅) 630 380 15 40 2.4.
Multilayer Composite Material Analysis of Heat Treatment The object of heat treatment is: (1) to eliminate welding residual stress; (2) reduce the sensitivity of the stress corrosion; (3) to soften the heat affected zone; (4) the plastic composite was improved; (5) make hydrogen to escape, etc.
ZHANG Fu-cheng, XU An-you, XU Tie-yan, WANG Tian-sheng, HU Bai-tao,With The Help of Gradient Coating ZGMn13 Steel And U71Mn Steel Welding Sex Research, Journal of Mechanical Engineering(1999),Vol.35,pp. 67-69 [6].
If metal organization toughness is insufficient easy generation surface layer under the action of shear stress cracks and peeling, influence of the composite material multi-layer anti-wear properties.
Metal Matrix of Material Mechanical Properties Table 2 45Mn Mechanic Performance σb(Mpa) σs(Mpa) δ5(℅) ψ(℅) 630 380 15 40 2.4.
Multilayer Composite Material Analysis of Heat Treatment The object of heat treatment is: (1) to eliminate welding residual stress; (2) reduce the sensitivity of the stress corrosion; (3) to soften the heat affected zone; (4) the plastic composite was improved; (5) make hydrogen to escape, etc.
ZHANG Fu-cheng, XU An-you, XU Tie-yan, WANG Tian-sheng, HU Bai-tao,With The Help of Gradient Coating ZGMn13 Steel And U71Mn Steel Welding Sex Research, Journal of Mechanical Engineering(1999),Vol.35,pp. 67-69 [6].
Online since: October 2011
Authors: Ning Zhuang, Song Ge, Da Chen, Wan Jun Ye, Jun Wei Li
So the steel-bar corrosion is the leading factor influencing concrete durability.
b) Assessment of pile’s bearing capacity The mechanical properties of pile are commonly tested by non-destructive detection method or dynamic pile testing to determine the pile’s bearing capacity.
Evaluation Method of Piled Wharf Evaluation procedures and steps of piled wharf including [1]-[5]: a) Due to different structure type, dividing sections and units, assigning these parts number and marking them in the field; b) Making site investigation, recording broken situation and taking photos and video data; c) According to investigation records, making qualitative analysis, determining the test section and content, working out testing scheme; d) According to testing framework, burying observation instrument, testing data in the field and field sampling for indoor measurement; e) According to testing results, making quantitative analysis, inferring characteristic number; f) According to actually measured and referred result, comparing original design characteristic parameter with new characteristic parameter, finding out deviations, evaluating each engineering properties of different project parts; g) By evaluation sequence of sections and units of engineering, making whole
And this method does not affect the structure appearance after reinforcement.
This method is commonly used for concrete components which are not seriously damaged which can prevent steel which is in the cracks from corroding but can not restore the original mechanical properties of damaged components.
b) Assessment of pile’s bearing capacity The mechanical properties of pile are commonly tested by non-destructive detection method or dynamic pile testing to determine the pile’s bearing capacity.
Evaluation Method of Piled Wharf Evaluation procedures and steps of piled wharf including [1]-[5]: a) Due to different structure type, dividing sections and units, assigning these parts number and marking them in the field; b) Making site investigation, recording broken situation and taking photos and video data; c) According to investigation records, making qualitative analysis, determining the test section and content, working out testing scheme; d) According to testing framework, burying observation instrument, testing data in the field and field sampling for indoor measurement; e) According to testing results, making quantitative analysis, inferring characteristic number; f) According to actually measured and referred result, comparing original design characteristic parameter with new characteristic parameter, finding out deviations, evaluating each engineering properties of different project parts; g) By evaluation sequence of sections and units of engineering, making whole
And this method does not affect the structure appearance after reinforcement.
This method is commonly used for concrete components which are not seriously damaged which can prevent steel which is in the cracks from corroding but can not restore the original mechanical properties of damaged components.
Online since: July 2014
Authors: C. P. Christin Raj, S.A. Ananthapuri Surendran, B. Amjathkhan, J.Antony Baksi Metilda, S.Eben Devaraj, Elango Aristotle
Such a flow directly cools the electrical and mechanical components or passes through an air/liquid heat exchanger, usually located on the top/back side of the nacelle.
In addition, in the former case, the airflow can carry a large amount of dust, sand, salt, etc. within the nacelle, whereas in the late case the heat exchanger affects the airflow around the turbine, thus making more difficult its control.
Such enhancement also depends on other factors, such as particles shape, volume fraction and thermal properties [7][8][9][10][11].
NANOFLUID CHARACTERIZATION In order to acquire significant data on the thermal properties of nanofluids mixtures of base fluid with different commercially available nanoparticles have been tested.
[11] Kau – Fui Vincent Wong and Tarun Kurma, Tranport properties of alumina nanofluids, Nanotechnology 19 (2008) 345702, (8 pp.).
In addition, in the former case, the airflow can carry a large amount of dust, sand, salt, etc. within the nacelle, whereas in the late case the heat exchanger affects the airflow around the turbine, thus making more difficult its control.
Such enhancement also depends on other factors, such as particles shape, volume fraction and thermal properties [7][8][9][10][11].
NANOFLUID CHARACTERIZATION In order to acquire significant data on the thermal properties of nanofluids mixtures of base fluid with different commercially available nanoparticles have been tested.
[11] Kau – Fui Vincent Wong and Tarun Kurma, Tranport properties of alumina nanofluids, Nanotechnology 19 (2008) 345702, (8 pp.).
Online since: August 2021
Authors: Megdi Eltayeb
Electrosprayed nanoparticles can protect environmental factors reactions, it is beneficial to capture nourishment enhance earlier to utilize in nourishments or refreshments.
Encapsulation prevents ethyl maltol from responding to environmental factors such as oxygen and water, thereby providing stabilized ethyl maltol, enhancing self-life and bioavailability.
Surface tension and viscosity are the important properties of the electrosprayed nanoparticle solutions that influence the development of nanoparticles in the electrospraying technique, both of which are affected by the concentration of electrosprayed nanoparticles [15].
The physical properties of ethyl maltol in the solvent-dissolved ethylcellulose and stearic acid (ethanol).
Zhang, Nanoparticles fabricated from bulk solid lipids: Preparation, properties, and potential food applications.
Encapsulation prevents ethyl maltol from responding to environmental factors such as oxygen and water, thereby providing stabilized ethyl maltol, enhancing self-life and bioavailability.
Surface tension and viscosity are the important properties of the electrosprayed nanoparticle solutions that influence the development of nanoparticles in the electrospraying technique, both of which are affected by the concentration of electrosprayed nanoparticles [15].
The physical properties of ethyl maltol in the solvent-dissolved ethylcellulose and stearic acid (ethanol).
Zhang, Nanoparticles fabricated from bulk solid lipids: Preparation, properties, and potential food applications.
Online since: November 2015
Authors: Naser Kabashi, Ragip Hadri, Violeta Nushi, Arton Dautaj, Cene Krasniqi
The flexural ductility affects the serviceability deflection of RC beams once flexural cracking take place.This paper focuses on the use of polypropilene fibres to improve the performance.
Its mechanical behavior is critically influenced by crack propagation.
The properties of fibers are presented in Table 2.
Table 2-Properties of fibers Fibers Type Production Length/ Diameter (mm) Density (gr/cm3) Tensile strength (N/mm2) PP Mapei Fiber NS12/NS18 Mapei/ITALY 12 to 18 0.91 400-500 Steel Straight-Hooked-end Inomix/GREECE 20-60/0.75-1 7.85 1100 In the test for flexural static loading, center points loading was applied to the specimen.
The reinforcement ratio using the different types of fibres results in different measurement of deflections, with different ages Fig. 7- Deflections of different sets on the 28 days Fig. 8- Deflections of different sets on the 56 days The mid-span cracks, mode of failure and deflections are the main factors indicated in servicibility of the examinated samples. 5.
Its mechanical behavior is critically influenced by crack propagation.
The properties of fibers are presented in Table 2.
Table 2-Properties of fibers Fibers Type Production Length/ Diameter (mm) Density (gr/cm3) Tensile strength (N/mm2) PP Mapei Fiber NS12/NS18 Mapei/ITALY 12 to 18 0.91 400-500 Steel Straight-Hooked-end Inomix/GREECE 20-60/0.75-1 7.85 1100 In the test for flexural static loading, center points loading was applied to the specimen.
The reinforcement ratio using the different types of fibres results in different measurement of deflections, with different ages Fig. 7- Deflections of different sets on the 28 days Fig. 8- Deflections of different sets on the 56 days The mid-span cracks, mode of failure and deflections are the main factors indicated in servicibility of the examinated samples. 5.
Online since: April 2016
Authors: Jiří Moskalík
Deposits can too affect the shape of flue gas channel and thereby reduce his size.
Thermal conductivity of fouling material is very important factor in calculation of heat transmission index.
Evidence of fouling in operational parameters of the incinerator First, we have to select modes of equipment operation before and after the shutdown that have the most similar operational parameters, otherwise the assessment of fouling affects is incorrect.
Evaluation of properties and impact of the deposits is an interdisciplinary issue, where are combined knowledge from Physic, Chemistry and power engineering.
In general, it seems appropriate to study how various aspects affect the equipment in order to improve their operations.
Thermal conductivity of fouling material is very important factor in calculation of heat transmission index.
Evidence of fouling in operational parameters of the incinerator First, we have to select modes of equipment operation before and after the shutdown that have the most similar operational parameters, otherwise the assessment of fouling affects is incorrect.
Evaluation of properties and impact of the deposits is an interdisciplinary issue, where are combined knowledge from Physic, Chemistry and power engineering.
In general, it seems appropriate to study how various aspects affect the equipment in order to improve their operations.