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Online since: August 2013
Authors: Baris Sayin, Erdem Damcı
However, fire resistance of CFRP is a primary factor limiting the widespread application of the composites in building applications.
At elevated temperatures, the properties of FRP deteriorate, resulting in rapid loss of strength and stiffness above glass transition temperature, Tg [4].
Because of the reduction in force transfer between fibers and the resin, the mechanical properties of the FRP reinforcements would be reduced.
Based on the results obtained from validated model, a number of recommendations for future research and application purposes are listed below: · The material properties of the insulation material, such as density, specific heat and thermal conductivity, directly affects temperature variation of RC beam element and thereby its collapse time.
For this reason, insulation materials with different material properties should be taken into consideration in the numerical and experimental studies and their effectiveness must be examined
At elevated temperatures, the properties of FRP deteriorate, resulting in rapid loss of strength and stiffness above glass transition temperature, Tg [4].
Because of the reduction in force transfer between fibers and the resin, the mechanical properties of the FRP reinforcements would be reduced.
Based on the results obtained from validated model, a number of recommendations for future research and application purposes are listed below: · The material properties of the insulation material, such as density, specific heat and thermal conductivity, directly affects temperature variation of RC beam element and thereby its collapse time.
For this reason, insulation materials with different material properties should be taken into consideration in the numerical and experimental studies and their effectiveness must be examined
Online since: September 2013
Authors: Severin Hönle
The quality of forming simulation in relation to the prediction of strains depends essentially on six key factors.
Therefore it is absolutely necessary to examine isolated parameters without interferences with other factors.
The forming of the sample is therefore not affected by the friction.
Therefore buckling-bending-tests were performed and mechanical properties were determined in tensile tests.
The material properties gained by tensile test procedure only provide an insufficient description of the material behaviour in terms of bending operations.
Therefore it is absolutely necessary to examine isolated parameters without interferences with other factors.
The forming of the sample is therefore not affected by the friction.
Therefore buckling-bending-tests were performed and mechanical properties were determined in tensile tests.
The material properties gained by tensile test procedure only provide an insufficient description of the material behaviour in terms of bending operations.
Online since: January 2016
Authors: Kai Qin Yu, Xiao Wei Zheng, Yin Fei Yang, Wei Zhang, Hui Tian, Xiang Dong Qi
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing,210016 China
2.
Introduction: Hard aluminum alloy with advantages of heat resistance and processing properties are widely used in the aviation and aerospace field [1].
Thus, the key problem for decreasing the machining deformation and improving quality of products is to predict the deformation and find the influence factors.
Fig. 4 Y-displacement image after processing (Unit: mm) Fig. 5 Y-displacement curve after processing The deformation of workpiece in X and Z axis affect its molding and fitting precision.
The initial and final states of mechanical process were all same in the finite element simulation, so there were same displacements.
Introduction: Hard aluminum alloy with advantages of heat resistance and processing properties are widely used in the aviation and aerospace field [1].
Thus, the key problem for decreasing the machining deformation and improving quality of products is to predict the deformation and find the influence factors.
Fig. 4 Y-displacement image after processing (Unit: mm) Fig. 5 Y-displacement curve after processing The deformation of workpiece in X and Z axis affect its molding and fitting precision.
The initial and final states of mechanical process were all same in the finite element simulation, so there were same displacements.
Online since: July 2008
Authors: Jun Li Li, Ming Chen, Qing Long An
This model is suitable for modeling cases with high strain, strain
rate, strain hardening, and non-linear material properties, which represents the main numerical
challenges when modeling metal cutting.
Moreover, predicted results such as cutting force, RS and cutting temperature might be affected by different parameters used in chip separation criterions.
The temperature increment associated with the heat generation may be expressed by p pl C ff T ρ εσ ∂⋅⋅⋅ =∆ 21 (1) Where T∆ is temperature increment, 1f is the work-heat convection factor, 2f is the conversion efficiency factor.
In addition, rolling process which produces a major mechanical deformation is more likely to generate compressive stress, while heat effect might result in tensile stress.
Hakem: Journal of Mechanical Engineering Science, Vol. 212 (1998) (5), p. 331-341
Moreover, predicted results such as cutting force, RS and cutting temperature might be affected by different parameters used in chip separation criterions.
The temperature increment associated with the heat generation may be expressed by p pl C ff T ρ εσ ∂⋅⋅⋅ =∆ 21 (1) Where T∆ is temperature increment, 1f is the work-heat convection factor, 2f is the conversion efficiency factor.
In addition, rolling process which produces a major mechanical deformation is more likely to generate compressive stress, while heat effect might result in tensile stress.
Hakem: Journal of Mechanical Engineering Science, Vol. 212 (1998) (5), p. 331-341
Online since: June 2021
Authors: Ming Yue, Feng Gao, Yu Jie Fan, Bo Xue Sun, Xiao Wen Yin
The life cycle list was calculated and the environmental impact of the main processes was examined using the ReCiPe method, and the main factors of environmental impact were identified.
Introduction NdFeB(neodymium iron boron) magnets are by far the most cost-effective magnets, featuring light weight, small size, good mechanical properties and strong magnetic properties [1-4].
In this paper, the properties of pollutant emissions and resource and energy consumption associated with production processes are used to characterize climate change (GWP), particulate matter formation (PMFP), fossil resource depletion (FDP), freshwater consumption (WCP), human toxicity (HTP), photochemical ozone formation (POFP), land acidification (AP), freshwater ecotoxicity (The eight impact categories of the (WTP) are identified as follows mid-point model evaluation indicators.
The reason for this is that the ethanol emitted during the calcium reduction phase contributes only to WTP, and therefore has the highest WTP sensitivity; however, for the calcium reduction process, the HTP characterization factor is 2-5 orders of magnitude more than the WTP characterization factor, and therefore has the highest HTP sensitivity in the calcium reduction process.
The main factors and sources of environmental stresses are identified by developing a life cycle model of the production process, calculating life cycle inventories and environmental impacts associated with the main processes.
Introduction NdFeB(neodymium iron boron) magnets are by far the most cost-effective magnets, featuring light weight, small size, good mechanical properties and strong magnetic properties [1-4].
In this paper, the properties of pollutant emissions and resource and energy consumption associated with production processes are used to characterize climate change (GWP), particulate matter formation (PMFP), fossil resource depletion (FDP), freshwater consumption (WCP), human toxicity (HTP), photochemical ozone formation (POFP), land acidification (AP), freshwater ecotoxicity (The eight impact categories of the (WTP) are identified as follows mid-point model evaluation indicators.
The reason for this is that the ethanol emitted during the calcium reduction phase contributes only to WTP, and therefore has the highest WTP sensitivity; however, for the calcium reduction process, the HTP characterization factor is 2-5 orders of magnitude more than the WTP characterization factor, and therefore has the highest HTP sensitivity in the calcium reduction process.
The main factors and sources of environmental stresses are identified by developing a life cycle model of the production process, calculating life cycle inventories and environmental impacts associated with the main processes.
Online since: August 2014
Authors: Tian Qing Liu, Xiang Qin Li, Ke Dong Song, Shi Xiao Li, Mei Yun Fang, Fang Xin Shi, Li Li Ji
Recently, more and more researchers have combined biomaterial scaffolds with different cells, constructing bone tissues in vitro for tissue regeneration with the same physical and biological properties as natural tissues.
Amongst them, calcium alginate microbeads are widely used in cell embedding, the release of drugs and growth factors as well as tissue engineering fields [5-7] because of its biocompatibility, biodegradability, high mechanical strength, good toughness and its three dimensional porous network structures, which can provide microenvironment for cell growth and stretching and also support cellular proliferation as well as induced differentiation in vitro.
Studies have shown that containing a large number of hydroxyapatite and BMP growth factor, bone power can promote the growth and differentiation of seed cells, and can also be recognized and creeping substituted [8] by host tissue cells after being implanted in vivo for its good osteoinductive activity.
For traditional 3D static culture [9,10], however, the mass transfer resistance restricts mass transfer of nutrients into scaffold and timely expulsion of metabolic products of internal cells, which seriously affects their normal proliferation and differentiation.
On one hand, microbeads can protect ADSCs from mechanical damage produced by fluid flow.
Amongst them, calcium alginate microbeads are widely used in cell embedding, the release of drugs and growth factors as well as tissue engineering fields [5-7] because of its biocompatibility, biodegradability, high mechanical strength, good toughness and its three dimensional porous network structures, which can provide microenvironment for cell growth and stretching and also support cellular proliferation as well as induced differentiation in vitro.
Studies have shown that containing a large number of hydroxyapatite and BMP growth factor, bone power can promote the growth and differentiation of seed cells, and can also be recognized and creeping substituted [8] by host tissue cells after being implanted in vivo for its good osteoinductive activity.
For traditional 3D static culture [9,10], however, the mass transfer resistance restricts mass transfer of nutrients into scaffold and timely expulsion of metabolic products of internal cells, which seriously affects their normal proliferation and differentiation.
On one hand, microbeads can protect ADSCs from mechanical damage produced by fluid flow.
Online since: April 2021
Authors: Sumit Dubal, Sachin Chavan
These properties make them suitable for energy storage applications.
CNFs show great potential for large-scale applications in energy storage and conversion with their excellent mechanical properties, superior thermal and electrical conductivities, and high chemical stability [8-10].
The stabilization treatment of PAN is carried out at 200-3000C which starts the formation of a thermally stable ladder structure which increases the stability and mechanical properties of the structure due to the four-point connection of the bonds [32].
The precursor solution properties, environmental conditions also showed an effect on the morphology of nanofibers.
Sachin Chavan.Review: Electro Spinning Technique and Factors Affecting Electro Spun Nano Fibers and Some Applications.
CNFs show great potential for large-scale applications in energy storage and conversion with their excellent mechanical properties, superior thermal and electrical conductivities, and high chemical stability [8-10].
The stabilization treatment of PAN is carried out at 200-3000C which starts the formation of a thermally stable ladder structure which increases the stability and mechanical properties of the structure due to the four-point connection of the bonds [32].
The precursor solution properties, environmental conditions also showed an effect on the morphology of nanofibers.
Sachin Chavan.Review: Electro Spinning Technique and Factors Affecting Electro Spun Nano Fibers and Some Applications.
Online since: September 2011
Authors: Rui Wang, Shu Jie Zhang, Da Wei
Hard anti-stab clothing is usually produced in metal materials, which featuring the physical and chemical properties, such as low weight, high strength, high hardness, corrosion resistance and other characteristics.
They mainly use their own unique chemical properties to enhance the anti-puncture performance.
In addition, because of a high degree of process complexity, these two methods can not applied in mass production, industrialization will be affected.
Since Fabric structure is different, the corresponding mechanical properties, protective performance are not the same.
Increasing the density and tightness of existing materials: While researching the anti-stab mechanism of other weft knitted fabric, Qiu Guanxiong, Jiang Yaming point out a way to improve the anti-stab-performance of materials, he need to develop a better shear properties of new materials and improve existing materials’ density, because density is a very important factor.
They mainly use their own unique chemical properties to enhance the anti-puncture performance.
In addition, because of a high degree of process complexity, these two methods can not applied in mass production, industrialization will be affected.
Since Fabric structure is different, the corresponding mechanical properties, protective performance are not the same.
Increasing the density and tightness of existing materials: While researching the anti-stab mechanism of other weft knitted fabric, Qiu Guanxiong, Jiang Yaming point out a way to improve the anti-stab-performance of materials, he need to develop a better shear properties of new materials and improve existing materials’ density, because density is a very important factor.
Online since: October 2009
Authors: Xin Cun Zhuang, Yu Wu, Cong Xin Li
Aim at the property of flexible Manufacturing systems, the dynamic
scheduling methods are analyzed and a coding method based on working procedure is improved in
this paper.
Each re-scheduling factor can drive the start time of re-scheduling, and the decision-making depends on a number of system attributes.
Step 3: Reading the re-scheduling factor to determine whether the scheduling program needs to regenerate.
Improper encoding will easily result in deadlock and decoding trouble, which may seriously affect the feasibility and effectiveness of the scheduling algorithm.
Wang: China Mechanical Engineering, Vol. 13 (2002) No.20, pp.1756-1760.
Each re-scheduling factor can drive the start time of re-scheduling, and the decision-making depends on a number of system attributes.
Step 3: Reading the re-scheduling factor to determine whether the scheduling program needs to regenerate.
Improper encoding will easily result in deadlock and decoding trouble, which may seriously affect the feasibility and effectiveness of the scheduling algorithm.
Wang: China Mechanical Engineering, Vol. 13 (2002) No.20, pp.1756-1760.
Online since: March 2013
Authors: Deng Guang Yu, Xiao Yan Li, Xia Wang, Ying Li, Shi Tang, Xu Yao Zhao
Electrospinning is a popular procedure for producing nanofibers due to ease of implementation and cost-effectiveness of the process, and the unique properties and versatile applications of the resultant nanofibers [6-11].
Although electrospinning is simple and straightforward, the mechanism of fiber formation involves complex electro-fluid-mechanical issues and there are many factors that can affect the fiber diameters and morphology.
Approaches that have been attempted to produce thin nanofibers include manipulation of intrinsic solution properties, addition of additives such as salts and surfactants to polymer solutions; and control of process parameters or ambient conditions [14-17].
Because the presence of sufficient chain-entanglement density in the working solution necessary to prevent capillary breakup and Rayleigh instability is the first and foremost factor for producing nanofibers with uniform structure, thinning nanofibers through reducing the polymer concentrations is often compromised by the detriment of nanofibers’ quality [18,19].
It has been applied broadly in controlling secondary structures of nanofibers, encapsulating drugs or biological agents into the polymer nanofibers, preparing nanofibers from materials that lack filament-forming properties, enclosing functional liquids within the fiber matrix, manipulating the size of self-assembled nanoparticles, preparing ultrafine fibers from concentrated polymer solutions previously thought to be unspinnable, and improving nanofibers’ quality systematically [22-30].
Although electrospinning is simple and straightforward, the mechanism of fiber formation involves complex electro-fluid-mechanical issues and there are many factors that can affect the fiber diameters and morphology.
Approaches that have been attempted to produce thin nanofibers include manipulation of intrinsic solution properties, addition of additives such as salts and surfactants to polymer solutions; and control of process parameters or ambient conditions [14-17].
Because the presence of sufficient chain-entanglement density in the working solution necessary to prevent capillary breakup and Rayleigh instability is the first and foremost factor for producing nanofibers with uniform structure, thinning nanofibers through reducing the polymer concentrations is often compromised by the detriment of nanofibers’ quality [18,19].
It has been applied broadly in controlling secondary structures of nanofibers, encapsulating drugs or biological agents into the polymer nanofibers, preparing nanofibers from materials that lack filament-forming properties, enclosing functional liquids within the fiber matrix, manipulating the size of self-assembled nanoparticles, preparing ultrafine fibers from concentrated polymer solutions previously thought to be unspinnable, and improving nanofibers’ quality systematically [22-30].