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Online since: October 2013
Authors: Yin Suo Dai, Jian Dang Ding, Yue Hu Tan, Xiao Jun Yuan, Chun Hua Lu, Zi Ming Gong
Successful grouting depends on grouting performance and material properties.
Markou et al. [10] studied the effect of many factors such as grain sizes, water to cement, superplasticizer, on effectiveness of cement grouting and compression strength and permeability coefficient.
Single fluid jet-grout strength and deformation properties [J].
Effect of superplasticizers on the rheological properties of cements [J].
Factors Affecting Engineering Properties of Microfine Cement Grouted Sands [J].
Markou et al. [10] studied the effect of many factors such as grain sizes, water to cement, superplasticizer, on effectiveness of cement grouting and compression strength and permeability coefficient.
Single fluid jet-grout strength and deformation properties [J].
Effect of superplasticizers on the rheological properties of cements [J].
Factors Affecting Engineering Properties of Microfine Cement Grouted Sands [J].
Online since: March 2013
Authors: Cai Li Zhang, Ning Li Li, Qing Yi Xiao, Ti Song, Chuang Du
Through the creation of the finite element analysis model of the composite pavement, the paper analyzed the shear stress and influencing factors such as a different level of force, the contact between the different layer, shear stress conditions, the surface layer modulus and thickness, base thickness, soil base resilient modulus.
The use of flame-retardant modifier to improve the flame retardant properties of the asphalt concrete, with cold-rolled ribbed steel mesh cement concrete leveling layer to adjust the aspect of the road slope, thick paving asphalt pavement, asphalt concrete leveling layer between set crumb rubber modified asphalt stress absorbing layer.
Stress-absorbing layer affect in maximum shear stress between layers According to the pavement structure, a finite element analysis model is established, the thickness of laying stress-absorbing layer takes 2~8cm and resilient modulus is in the range of 10~300Mpa and its benchmark value is 150Mpa.
Table 2 Stress-absorbing layer modulus variation of the maximum shear stress between layers Stress layer modulus changes(Mpa) 80 90 100 110 120 130 140 The top layer of shear stress(Mpa) 0.223 0.232 0.240 0.248 0.255 0.261 0.266 Layer bottom shear stress(Mpa) 0.161 0.166 0.170 0.174 0.177 0.179 0.182 Stress layer modulus changesMpa) 150 160 170 180 190 200 210 The top layer of shear stress(Mpa) 0.272 0.277 0.282 0.287 0.291 0.294 0.298 Layer bottom shear stress(Mpa) 0.184 0.186 0.188 0.19 0.192 0.192 0.194 Fig.2 Interlaminar shear stress and stress-absorbing layer resilient modulus curve Fig.2 shows that the size of the interlayer shear stress increases with the increase of the stress-absorbing layer resilient modulus, when the resilient modulus varies from 80MPa to 210MPa and when the top layer and layer bottom shear stress change values respectively33.7% and 20.2%, visible stress-absorbing layer resilient modulus of the interlayer shear stress significantly affect the lower resilient
[2] XiaoMin Wang:Tunnel composite asphalt pavement structure of the mechanical properties and anti-drainage system optimization(chongqingjiaotong University ,Chongqing 2007) .In Chinese
The use of flame-retardant modifier to improve the flame retardant properties of the asphalt concrete, with cold-rolled ribbed steel mesh cement concrete leveling layer to adjust the aspect of the road slope, thick paving asphalt pavement, asphalt concrete leveling layer between set crumb rubber modified asphalt stress absorbing layer.
Stress-absorbing layer affect in maximum shear stress between layers According to the pavement structure, a finite element analysis model is established, the thickness of laying stress-absorbing layer takes 2~8cm and resilient modulus is in the range of 10~300Mpa and its benchmark value is 150Mpa.
Table 2 Stress-absorbing layer modulus variation of the maximum shear stress between layers Stress layer modulus changes(Mpa) 80 90 100 110 120 130 140 The top layer of shear stress(Mpa) 0.223 0.232 0.240 0.248 0.255 0.261 0.266 Layer bottom shear stress(Mpa) 0.161 0.166 0.170 0.174 0.177 0.179 0.182 Stress layer modulus changesMpa) 150 160 170 180 190 200 210 The top layer of shear stress(Mpa) 0.272 0.277 0.282 0.287 0.291 0.294 0.298 Layer bottom shear stress(Mpa) 0.184 0.186 0.188 0.19 0.192 0.192 0.194 Fig.2 Interlaminar shear stress and stress-absorbing layer resilient modulus curve Fig.2 shows that the size of the interlayer shear stress increases with the increase of the stress-absorbing layer resilient modulus, when the resilient modulus varies from 80MPa to 210MPa and when the top layer and layer bottom shear stress change values respectively33.7% and 20.2%, visible stress-absorbing layer resilient modulus of the interlayer shear stress significantly affect the lower resilient
[2] XiaoMin Wang:Tunnel composite asphalt pavement structure of the mechanical properties and anti-drainage system optimization(chongqingjiaotong University ,Chongqing 2007) .In Chinese
Online since: March 2010
Authors: Zhi Jian Peng, Cheng Biao Wang, Xiu Jun Du, Song Sheng Lin, Xiang Yu, Zhi Qiang Fu, Ming Jiang Dai
W-doped DLC films were synthesized from CH4 and W by ion beam deposition and magnetron
sputtering, and the influence of W target current on the surface morphology and the mechanical properties
of W-doped DLC films deposited were studied.
The introduction of metal elements into pure DLC films is a fascinating method to improve the tribological properties of DLC films for it can greatly reduce the difference at the film/metal interface and the residual stress in the films.
Mastering the influence of the deposition parameters on the tribological properties of W-doped DLC films is very important for their applications.
The adhesion between W-doped DLC films and 316 stainless steel was evaluated by a MFT-4000 surface properties tester under the conditions with a load rate of 40N/min, a end load of 100N and a scratch length of 5mm.
The particles induced by vacuum arc have less obvious influence on the tribological properties of DLC films for the structures and the properties in the different zones of the top W-DLC films are similar.
The introduction of metal elements into pure DLC films is a fascinating method to improve the tribological properties of DLC films for it can greatly reduce the difference at the film/metal interface and the residual stress in the films.
Mastering the influence of the deposition parameters on the tribological properties of W-doped DLC films is very important for their applications.
The adhesion between W-doped DLC films and 316 stainless steel was evaluated by a MFT-4000 surface properties tester under the conditions with a load rate of 40N/min, a end load of 100N and a scratch length of 5mm.
The particles induced by vacuum arc have less obvious influence on the tribological properties of DLC films for the structures and the properties in the different zones of the top W-DLC films are similar.
Online since: February 2012
Authors: Asaad A. Abdullah, Usama J. Naeem, Cai Hua Xiong
The surface roughness is often the most important feature in process engineering given the decisive influence on the surfaces of mechanical and physical properties of the machined part. [1].
The overall capacity of the network, In fact, depends on three factors.
Experimental and Analysis of Data The trial was conducted to assess the effect of cutting process factors in the surface roughness.
By using the properties of the linear and quadratic order functions, the best model of the surface roughness was achieved.
To verify the influence of cutting factors (cutting speed, cutting depth, and feed rate) on the surface roughness of the workpiece, and to determine the best factors to get the lower value of surface roughness, by using ANOVA, the signal _ to _ noise ratio (S/N), and Taguchi’s optimization methods.
The overall capacity of the network, In fact, depends on three factors.
Experimental and Analysis of Data The trial was conducted to assess the effect of cutting process factors in the surface roughness.
By using the properties of the linear and quadratic order functions, the best model of the surface roughness was achieved.
To verify the influence of cutting factors (cutting speed, cutting depth, and feed rate) on the surface roughness of the workpiece, and to determine the best factors to get the lower value of surface roughness, by using ANOVA, the signal _ to _ noise ratio (S/N), and Taguchi’s optimization methods.
Online since: November 2012
Authors: Pouria Kavandi, Maryam Mohammadi, Seyed Sina Khamesi
Granular material properties and dimensions of the geometry[10]
1680 [kg/m3]
Density
50 [µm]
Cement particles diameter
1 [m]
Kiln length
10 [cm]
Kiln diameter
5 [cm]
Dam height
Step shaped dam
Triangle shaped dam
Figure 3.a.
The results of this research are based on all of the properties of 1 two-phase flow such as: viscosity effect, particle diameter, kiln rotational velocity and kiln slope.
The flow is affected by these parameters: kiln slope, kiln rotational velocity and dams which contract the flow path.
Increasing slope or rotational velocity will affect the high of bed considerably.
Saeman: Passage of solids through rotary kilns: factors affecting time of passage, Chem.
The results of this research are based on all of the properties of 1 two-phase flow such as: viscosity effect, particle diameter, kiln rotational velocity and kiln slope.
The flow is affected by these parameters: kiln slope, kiln rotational velocity and dams which contract the flow path.
Increasing slope or rotational velocity will affect the high of bed considerably.
Saeman: Passage of solids through rotary kilns: factors affecting time of passage, Chem.
Online since: September 2011
Authors: Hai Lan Feng, Yi Wang Bao, Yi Hong Liu, Yan Qiu, Lin Jia Zhu, Hui Juan Chen, Qing Hui Zhang
The veneer safe from damage is mainly depended on the properties of core materials due to the poor strength and toughness of porcelain.
It has been demonstrated that their mechanical performance relies on the intrinsic mechanical properties and properties matching of the inner core ceramic and the outer porcelain shell [2].
The mechanical properties of core ceramic and the performance of interface of core/porcelain affected the damage process of porcelain [2].
The mismatch of the flexural strength of the porcelain and core materials was also the mechanical factors influenced the crack path.
The FEA simulation revealed that the interfacial delamination observed in ziconia bi-layer composites was initiated by shear stresses building up along the interface due to the mechanical properties mismatch of the porcelain and core [2].
It has been demonstrated that their mechanical performance relies on the intrinsic mechanical properties and properties matching of the inner core ceramic and the outer porcelain shell [2].
The mechanical properties of core ceramic and the performance of interface of core/porcelain affected the damage process of porcelain [2].
The mismatch of the flexural strength of the porcelain and core materials was also the mechanical factors influenced the crack path.
The FEA simulation revealed that the interfacial delamination observed in ziconia bi-layer composites was initiated by shear stresses building up along the interface due to the mechanical properties mismatch of the porcelain and core [2].
Online since: November 2012
Authors: H. Rama Murthy Naik, J. Jerald, N. Rajesh Mathivanan
Ultrasonic testing uses transmission of high frequency sound waves into a material to detect imperfections or to locate changes in material properties.
Hosur et al. (1998) Investigated ultrasonic through-transmission or pulse-echo techniques rely on the use of high-frequency mechanical oscillations for the detection of damage mechanisms; by measuring the signal amplitude and/or the time-of-flight of the ultrasonic signal the location and size of the defects can be estimated.
Therefore, it is not only the energy but the velocity and the mass which are the decisive factors affecting the response of a laminate.
[5] Zongjie Cao, Huaidong Chen, Jin Xue, Yuwen Wang (2005) Evaluation of mechanical quality of field-assisted diffusion bonding by ultrasonic nondestructive method.
Hosur et al. (1998) Investigated ultrasonic through-transmission or pulse-echo techniques rely on the use of high-frequency mechanical oscillations for the detection of damage mechanisms; by measuring the signal amplitude and/or the time-of-flight of the ultrasonic signal the location and size of the defects can be estimated.
Therefore, it is not only the energy but the velocity and the mass which are the decisive factors affecting the response of a laminate.
[5] Zongjie Cao, Huaidong Chen, Jin Xue, Yuwen Wang (2005) Evaluation of mechanical quality of field-assisted diffusion bonding by ultrasonic nondestructive method.
Online since: July 2021
Authors: Konstantinos Sotiriadis, Andrii Kovalov, Yurii Otrosh, Sergii G. Guzii, Olena Guzii
Domestic or industrial activities, as well as natural phenomena, are among the risk factors that may cause ignition [2, 3].
This behavior can be tailored to the needs of certain applications by altering the water content in the magnesite mixture or the annealing temperature to obtain MgO powder, both affecting the microstructure and the properties of the obtained heat-insulating material, similarly to magnesium potassium phosphate ceramics [20, 21].
Kovalov, et al., Parameters of fire-retardant coatings of steel constructions under the influence of climatic factors.
Nevřivová, Study on the properties of geocement based thermal insulating materials for high temperature technical appliances, AMR. 734-737 (2013) 2356-2359
Kopylova, Study on physico-mechanical properties of the modified alkaline aluminosilicate adhesive-bonded timber elements.
This behavior can be tailored to the needs of certain applications by altering the water content in the magnesite mixture or the annealing temperature to obtain MgO powder, both affecting the microstructure and the properties of the obtained heat-insulating material, similarly to magnesium potassium phosphate ceramics [20, 21].
Kovalov, et al., Parameters of fire-retardant coatings of steel constructions under the influence of climatic factors.
Nevřivová, Study on the properties of geocement based thermal insulating materials for high temperature technical appliances, AMR. 734-737 (2013) 2356-2359
Kopylova, Study on physico-mechanical properties of the modified alkaline aluminosilicate adhesive-bonded timber elements.
Online since: November 2015
Authors: Kamarul Ariffin Zakaria, Shahrum Abdullah, M.B. Ali, M.R. Alkhari
The total absorbed energy becomes higher or lower than the optical encoder energy depending on the strength of material, ductility of test specimen, and other factors [6].
The specimen and striker properties are given in Table 1.
Properties of material for the striker and charpy specimen.
When the strain value and the impact duration were higher, the area for strain versus time became larger, thereby affecting the PSD value.
When the strain value and the impact duration were higher, the area for strain versus time became larger, thereby affecting the PSD value.
The specimen and striker properties are given in Table 1.
Properties of material for the striker and charpy specimen.
When the strain value and the impact duration were higher, the area for strain versus time became larger, thereby affecting the PSD value.
When the strain value and the impact duration were higher, the area for strain versus time became larger, thereby affecting the PSD value.
Online since: October 2011
Authors: Janakarajan Ramkumar, M. Ravi Sankar, V.K. Jain
Al alloy/SiC composites possess better mechanical and physical properties thus finding applications in automotive, sports, and aerospace.
These properties determine the aggressiveness of the abrasion.
Workpiece properties, process input conditions, component geometry, and medium properties are the most important factors that affect the performance of the process.
Soft styrene butadiene provides the dominating elastic and partial viscous properties.
At low plasticizer to polymer ratio, polymer dictates the medium properties (i.e., elastic properties are dominant).
These properties determine the aggressiveness of the abrasion.
Workpiece properties, process input conditions, component geometry, and medium properties are the most important factors that affect the performance of the process.
Soft styrene butadiene provides the dominating elastic and partial viscous properties.
At low plasticizer to polymer ratio, polymer dictates the medium properties (i.e., elastic properties are dominant).