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Online since: October 2022
Authors: Kamonlak Kesmanee, Wanwanut Boongsood, Amarin Chanpariyavatevong
Carbon fiber reinforced polymer (CFRP) is commonly used in many industries such as sports equipment, aerospace and automotive industries because of its particular properties of low weight and high strength.
Introduction Over the years, composite materials such as carbon fiber reinforced plastics (CFRP) have been used in many industries, due to the unique properties of carbon fiber reinforced plastics with low weight and high strength [1].
The drilling conditions, cutting speeds and feed rates as experimental factors were set at different levels, as shown in Table 3.
The range of factors in this table was selected from the usage range recommended by the manufacturer and previous research [11, 12].
Cong, A review of mechanical drilling for composite laminates, Composite structures. (2012) 1265-1279
Introduction Over the years, composite materials such as carbon fiber reinforced plastics (CFRP) have been used in many industries, due to the unique properties of carbon fiber reinforced plastics with low weight and high strength [1].
The drilling conditions, cutting speeds and feed rates as experimental factors were set at different levels, as shown in Table 3.
The range of factors in this table was selected from the usage range recommended by the manufacturer and previous research [11, 12].
Cong, A review of mechanical drilling for composite laminates, Composite structures. (2012) 1265-1279
Online since: February 2011
Authors: Hong De Qin, Ya Zhou Zhu
Some factors such as platform structure form, working load, see condition and welding technology directly affects the thick high-strength rack’s mechanical property.
Points of Rack Plate Weld Technology Jack-up drilling platform structure is complex; working environment is very harsh; investment is very huge and legs are the main bearer structure unit, so it requires high mechanical properties for legs.
Choosing the welding rod of ultra low hydrogen type or low hydrogen type can prevent cold cracks and improve the toughness of heat affected zone.
It needs to be cleaned out that Oxide, water, oil, rust and other impurities that affect the quality of welding in the groove and the groove edge of the range of 20mm each side.
Points of Rack Plate Weld Technology Jack-up drilling platform structure is complex; working environment is very harsh; investment is very huge and legs are the main bearer structure unit, so it requires high mechanical properties for legs.
Choosing the welding rod of ultra low hydrogen type or low hydrogen type can prevent cold cracks and improve the toughness of heat affected zone.
It needs to be cleaned out that Oxide, water, oil, rust and other impurities that affect the quality of welding in the groove and the groove edge of the range of 20mm each side.
Online since: August 2014
Authors: Qin Yu Niu, Kuan Wang
The synchronization performance is one of the two basic properties of synchronizer [1].
Influencing factors In order to study the synchronization performance of lock-pin synchronizer, analyzing the effects of various factors on the synchronization time.
The lock-pin synchronizer, relative to the lock ring synchronizer, one big advantage is that the cone radius is not affected by the diameter of the gear.
And analysis the factors like the friction coefficient, engine speed, cone radius, input moment of inertia respectively, how they influence the performance of the synchronizer.
Mechanical transmission.2013.98-101
Influencing factors In order to study the synchronization performance of lock-pin synchronizer, analyzing the effects of various factors on the synchronization time.
The lock-pin synchronizer, relative to the lock ring synchronizer, one big advantage is that the cone radius is not affected by the diameter of the gear.
And analysis the factors like the friction coefficient, engine speed, cone radius, input moment of inertia respectively, how they influence the performance of the synchronizer.
Mechanical transmission.2013.98-101
Online since: July 2015
Authors: Alwin Nagel, Johannes Edelbauer, David Schuller, Oliver Lott
The combination of both materials seems beneficial as the fracture toughness and ductility of the metal phase with the stiffness and creep resistance of the ceramic shows promising materials properties, especially at high temperatures [3,4].
Squeeze casting is a fast primary shaping process offering good mechanical properties of the casting.
An increase in tool temperature does affect the load to be absorbed by the tension rings.
Matsuda, Effects of some Factors on the Critical Preheating Temperature of Particles in Producing Metal-Particle Composites by Pressure Casting, Journal of the Japan Foundrymen Society 53 (1981) 35-43
Huchler, Pressure Infiltration Behaviour and Properties of Aluminum Alloy - Oxide Ceramic Preform Composites, Dissertation, University of Birmingham, Birmingham, England, 2009
Squeeze casting is a fast primary shaping process offering good mechanical properties of the casting.
An increase in tool temperature does affect the load to be absorbed by the tension rings.
Matsuda, Effects of some Factors on the Critical Preheating Temperature of Particles in Producing Metal-Particle Composites by Pressure Casting, Journal of the Japan Foundrymen Society 53 (1981) 35-43
Huchler, Pressure Infiltration Behaviour and Properties of Aluminum Alloy - Oxide Ceramic Preform Composites, Dissertation, University of Birmingham, Birmingham, England, 2009
Online since: June 2007
Authors: Y.H. Kim, Chang Hwy Lim, Xiang Ma, H.C. Baek
It is known that the properties
of the constituent powders play an important role in determining the properties of the final part.
However, by consolidating powders of different constituents, a spectrum of new composites with unique properties is now possible.
Such composites are known to have, hitherto, unattainable mechanical, electrical and magnetic properties.
Lastly these materials can be produced to the desired densities in parts varying from low-density porous bearings to high-density structural and load carrying components with comparable mechanical properties to most known metallic materials [1].
The variable density in such products gives rise to distortion and uncontrolled residual stresses affecting the final quality of powder-based products [2].
However, by consolidating powders of different constituents, a spectrum of new composites with unique properties is now possible.
Such composites are known to have, hitherto, unattainable mechanical, electrical and magnetic properties.
Lastly these materials can be produced to the desired densities in parts varying from low-density porous bearings to high-density structural and load carrying components with comparable mechanical properties to most known metallic materials [1].
The variable density in such products gives rise to distortion and uncontrolled residual stresses affecting the final quality of powder-based products [2].
Online since: April 2010
Authors: R. Bakhtiari, A. Ekrami
Bainite morphology and mechanical properties depend on austempering temperatures.
Austempering time is also an important factor which determines the percentage of bainite transformation completion and therefore can affect the final microstructure.
According to previous work by one of the authors [9], ferrite-bainite steels with 34% volume fraction of ferrite showed the optimum mechanical properties.
Mechanical properties of samples austempered at different temperatures are given in table 3.
Table 3: Mechanical properties of the investigated steel austempered at different temperatures Austempering temp.
Austempering time is also an important factor which determines the percentage of bainite transformation completion and therefore can affect the final microstructure.
According to previous work by one of the authors [9], ferrite-bainite steels with 34% volume fraction of ferrite showed the optimum mechanical properties.
Mechanical properties of samples austempered at different temperatures are given in table 3.
Table 3: Mechanical properties of the investigated steel austempered at different temperatures Austempering temp.
Online since: October 2014
Authors: Ning Li, Chi Lan Cai, Ya Fei He, Qing Zhi Lin
Its dynamic performance directly affects the accuracy of the geometry, and be the root cause of vibration, noise and temperature increase, etc.
It is a complex strong coupling system, including mechanical, electrical, magnetic, and thermal, etc.
Except the mechanical factors, such as rotor shaft concentricity, rigidity and rotor bearings jump, etc., the core effect come from motor torque control accuracy.
Meanwhile PWM frequency is also affected by the resource constraints of control system, higher PWM frequency needs higher resource at control system.
In the Motorized Spindle machining process, due to the different mechanical characteristics of the work piece and material properties, the Motorized Spindle need to work at the volatile states that torque and speed will change frequently, rather than work at a constant area.
It is a complex strong coupling system, including mechanical, electrical, magnetic, and thermal, etc.
Except the mechanical factors, such as rotor shaft concentricity, rigidity and rotor bearings jump, etc., the core effect come from motor torque control accuracy.
Meanwhile PWM frequency is also affected by the resource constraints of control system, higher PWM frequency needs higher resource at control system.
In the Motorized Spindle machining process, due to the different mechanical characteristics of the work piece and material properties, the Motorized Spindle need to work at the volatile states that torque and speed will change frequently, rather than work at a constant area.
Online since: May 2007
Authors: Jin Koo Park, Sung Min Joo, Sang Hwan Cho, Ji Whan Ahn, Hwan Kim, Im Ho Kim, Seung Kwan Lee
When PCC is as paper filler and coating color, the mean particle size, size
distribution and particle shapes could be important factors which have an influence on physical and
optical properties of paper.
And these impurities have a bad influence on calcinations of limestone, reactivity of CaO and properties of synthesized PCC.
As shown in Fig. 3, the mechanical properties such as tensile strength, bursting strength, stiffness of the paper were relatively low because the addition of filler decreased the quantity of fiber, and the fine particles of the filler which are located between fibers interrupted the bonding of fibers[4,5,6].
Hemstock, "The effect of clays upon the optical properties of paper" J.
Robinson, "Optical properties of paper as affected by wet-end chemistry" J.
And these impurities have a bad influence on calcinations of limestone, reactivity of CaO and properties of synthesized PCC.
As shown in Fig. 3, the mechanical properties such as tensile strength, bursting strength, stiffness of the paper were relatively low because the addition of filler decreased the quantity of fiber, and the fine particles of the filler which are located between fibers interrupted the bonding of fibers[4,5,6].
Hemstock, "The effect of clays upon the optical properties of paper" J.
Robinson, "Optical properties of paper as affected by wet-end chemistry" J.
Online since: March 2009
Authors: De Hai Ping, Li Ming Yu, Fu Xing Yin, Satoshi Iwasaki
Introduction
Internal friction is defined as the mechanical energy dissipation property of materials, measured by
the energy dissipation ∆W, divided by the maximum elastic energy W during one cycle loading, i.e.
temperature, and the dipole shape factor, which is the intrinsic parameter controlling the peak height.
Since high damping alloys are also expected to have adequate mechanical properties, as well as the superior workability for the applications as Fig. 4.
Snoek relaxation peak shift and broadening observed in Nb-1%M alloys a), and Nb-50%V alloys b) [13,14]. structural materials, Ti based alloys involving such metallic solutes, Nb, Cr, or V, become the smart choice in such alloys design since β-Ti alloys show the good mechanical properties for engineering applications [7].
It is made clear that Ti and Cr show a larger binding effect than Nb in affecting the V-O relaxation.
temperature, and the dipole shape factor, which is the intrinsic parameter controlling the peak height.
Since high damping alloys are also expected to have adequate mechanical properties, as well as the superior workability for the applications as Fig. 4.
Snoek relaxation peak shift and broadening observed in Nb-1%M alloys a), and Nb-50%V alloys b) [13,14]. structural materials, Ti based alloys involving such metallic solutes, Nb, Cr, or V, become the smart choice in such alloys design since β-Ti alloys show the good mechanical properties for engineering applications [7].
It is made clear that Ti and Cr show a larger binding effect than Nb in affecting the V-O relaxation.
Online since: November 2013
Authors: Pina M. Bhatt, Hitarthi H. Patel, U.S. Joshi, Dhawal H. Agrawal, Abrarkhan M. Pathan
Cryogenics Division, Mechanical Engineering Department, L.D.
MICROSCOPE = AFM is incorporated among a broad group of instruments used to image and measure properties of material, chemical, and biological surfaces.
SS304 is used for fabrication as it has excellent properties at cryogenic temperature such as low heat transfer rate, high strength, better corrosion resistance, fracture toughness, fabricability, etc.
The copper rod not only serves to transmit cooling effect but also prevents the vibrations that are generated due to LN2 boiling from affecting the tip of AFM.
In addition to aluminium's excellent vacuum properties it is also a more versatile material from a manufacturing standpoint.
MICROSCOPE = AFM is incorporated among a broad group of instruments used to image and measure properties of material, chemical, and biological surfaces.
SS304 is used for fabrication as it has excellent properties at cryogenic temperature such as low heat transfer rate, high strength, better corrosion resistance, fracture toughness, fabricability, etc.
The copper rod not only serves to transmit cooling effect but also prevents the vibrations that are generated due to LN2 boiling from affecting the tip of AFM.
In addition to aluminium's excellent vacuum properties it is also a more versatile material from a manufacturing standpoint.