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Online since: September 2012
Authors: Cosimo Carfagna, Lorena Affatato
New functions are required to modern textiles: wearing comfort, durability, cleaning properties, optimized functionality for specific applications (workwear, sportswear, medical wear).
The smart technology is rewarding materials with new properties and abilities which have never been experienced before.
Changing in their mechanical properties as well as their thermal, optical, and electromagnetic properties, in a handy manner in response to the stimuli.
As an example, microfibers have waterproofing properties but at the same time they are permeable to water vapour.
The amount of energy transferred to make these changes is determined by the material properties.
Online since: June 2013
Authors: Fabiano Rezende, Pedro Manuel Calas Lopes Pacheco, Luís Felipe Guimarães de Souza
The developed model takes into account the coupling between mechanical and thermal fields and the temperature dependency of the thermomechanical properties.
The developed model takes into account the coupling between mechanical and thermal fields and the temperature dependency of the thermo mechanical properties.
The numerical simulations developed considers thermal and mechanical temperature-dependent properties for UNS32750 until 600 °C [18,21-23], after this temperatures was used AISI 316L thermal and mechanical properties [24].
The numerical model permits to assess the stress levels during and after welding execution considering mechanical and thermal properties of material in function of temperature.
Microstructure, properties and applications, Cambridge, Abington Pub. (2003)
Online since: October 2014
Authors: Yan Li
The current actual capacity of LiFePO4 has reached 160 mA⋅h⋅g-1, but after only a theoretical capacity of 170mA ⋅h⋅g-1, affecting its total energy; Li3V2 (PO4) 3 with 200 mA⋅h⋅g-1 around is higher than the capacity, but the cycle is less stable [4].
The addition of metal ions in the cathode material LiFePO4, replace the lattice position of Fe, the lattice defects and promote the diffusion of Li +,which can improve the internal conductive properties.
The LiFePO4 sample is a synthesis method using combined solid phase synthesis and mechanical milling.
Cell collapse causes the structure becomes unstable, so that is not conducive to the lithium ions in the charge and discharge process in the three-dimensional structure of dropping into and block out, thus worsening the electrochemical properties of cathode materials.
Fig.5 Charging/discharging profiles of P1 at the first cycle of LiFePO4 and 0.05c Conclusions The purpose of doping of Mg2+ ion improves the olivine type structure of LiFePO4 low intrinsic conductivity, so as to improve the electrochemical properties of materials.
Online since: September 2011
Authors: Yun Cai Zhao, Shu Feng Huang, Xiao Mei Liu
The research shows: round pit texture has a certain influence on friction factor of coating’s surface and abrasion loss.
Foreword Wear-resisting coating prepared by supersonic plasma spraying has excellent mechanical property, friction and wear property, anti-oxidation and corrosion-resistance, so wide attention and application are received, and there are many researches about it to be reported[1-3].
The technical problem just can be solved by the laser remelting[4-5], and coating’s layer structure, most of pores and oxide inclusion are removed, forming uniform dense coating, thereby it ensures coating’s properties and improves working life of parts.
Friction coefficient is related to properties of boundary film and the distribution of surface effective gradient, property of boundary film is related to third-body bed, the increase of thickness of third-body bed can make effective gradient decrease, this is said the change of third-body bed can cause the change of friction coefficient.
Micro moulding has a certain influence on third-body bed, so it can be thought micro moulding has a certain influence on tribological properties.
Online since: December 2012
Authors: Shu Ren Wang, Zhong Qiu Wang
Introduction The layer deposition property of coal-bearing strata is the main cause that the roof of the mined-out areas displays the layered structural characteristic.
Some scholars carried out many tests to study the mechanical properties of the layered rock [6-7], and some scholars regarded the roof of the mined-out areas as an elastic rock beam to do the mechanical analysis [8-9].
To the quantitative evaluation method and the influencing factors of the safety thickness of the roof in the mined-out areas, foreign scholars had also done a lot of meaningful work, many new theories and methods were introduced to predict the safety thickness of the layered roof [10-12].
In order to reflect the mechanical response characteristics under different conditions, these contrastive analysis schemes of the simulation calculation were listed in Table 2.
Scheme Fixed factors Variation factors Notes 1 θ=0°, c=10 kPa, λ=0 w: 6 m, 8m, 10m,12m w is the mining width; θ is the dip angle of coal seam; c is the cohesion of the layered roof; λ is the lateral pressure coefficient, amely the ratio of horizontal stress and vertical stress 2 w=8 m, θ=0°, c=10 kPa λ: 0.5, 0.75, 1.0, 1.25,1.75 3 w=8 m, θ=0°, λ=0 c : 0 kPa, 40 kPa, 70 kPa, 100 kPa 4 w=10 m, λ=0, c=10 kPa θ : 0°, 15°, 30°, 45°, 60° Calculation Results and Discussion Separation Analysis with Different Mining Width.
Online since: December 2013
Authors: Yin Nan Yuan, Guan Nan Xi, Ya Yuan Bao
Most of the researches compared the circular cylinders with other disturbed components on the heat transfer effect and analyzed the factors which can affect the heat transfer effect.
Conversely, it will greatly affect the overall heat transfer.
So the water drop-shaped column array is a promising configuration with comprehensive properties and can replace the normal circle-shaped column.
Xueli Leng[10] discussed the thermal property of vibration pipe and did the experiment on heat transfer properties of the vibration pipe when fluid passes by it slowly.
And the ways of studying on its influencing factors are mostly through numerical simulations and experiment.
Online since: April 2008
Authors: Hai Hong Wu, Zhen Feng Zhao, Chang Yu Shen
Introduction Injection molded polymer parts always have internal stresses that affect their properties and dimensional stabilities.
The effective way to acquire the relaxation parameters of a polymer is to introduce the shift factor by means of WLF equation, which means that time and temperature are generally equivalent in affecting the relaxation modulus of polymers.
The WLF equation was proposed as an empirical expression for the shift factor and has been frequently utilized to model the temperature dependence of different polymers.
In addition, the properties of polymers, such as Young's modulus and viscos factor, always depend on the temperature, time and other processing conditions.
The instruction of internal stress development The mechanical characteristics of polymers are highly sensitive to the rate of deformation (strain rate), the temperature, and the time.
Online since: January 2024
Authors: Fakhreza Abdul, Kariza Defarrel Aqil Ilman, Fahny Ardian, Sungging Pintowantoro, Yuli Setiyorini
Table 2 show the characteristics of ASTM F75 are assigned to acetabular and stem part of the prosthesis, while the femur bone mechanical properties is shown in Table 3.
Mechanical properties of CoCrMo.
Mechanical properties of femur bone.
The lifetime of the AHP is influenced by 2 factors, namely from the inside of the material such as the Wear Coefficient and from the outside in the form of Contact Pressure and Sliding Distance.
Hastings, Handbook of biomaterial properties, second edition. 2016
Online since: October 2004
Authors: Tai Chiu Lee, Lei Wang
The friction condition between blank and the tools is one of the most influencing factors to the whole deep drawing process.
Table 1 Material property of sheet material Material property unit Density 7.8e-6 [kg/mm3].
Due to its good machining ability and high mechanical property it is applied into many metalworking fields such as auto body, electrical product and steel-made furniture etc.
Design of experiment DOE is a popular method that plans and conducts experiments and analyzes the result data to identify the factors which significantly influence the process.
It is clear that the friction condition between the blank and the punch is the most influencing factor which does affect the forming process.
Online since: August 2015
Authors: Marina Popova, Aleksandr Prudnikov, Vladimir K. Afanasyev
Furthermore, we showed that the composition of atmosphere significantly affects structure formation and physic-mechanical properties of aluminum alloys [5-7].
This, in turn, leads to the change of the structure and properties of aluminum alloys, in particular, it affects their coefficient of linear expansion.
Results We implemented comparative analysis of the properties of alloy Al – 5% Cu after boiling treatment during 15, 30 and 45 hours respectively.
Gregson, Predicting the structural performance of heat-treatable Al-alloys, Aluminum Alloys: their physical and mechanical properties, 2000, vol. 331-337, p. 97-110
Tumbull, Effects of Hydrogen on Properties of Aluminum Alloys, Paper from Hydrogen in Metals, American Society for Metals, 1974, 277-287
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