Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: October 2013
Authors: Hua Li, De Xiang Zhu, Yue Chen, Rui Li
Safety of the arch bridge will change when a suspender sudden failure, and affect the safety of the structure.
The relative length of the side suspender is short, to improve its displacement caused by the change of the adaptation load, temperature and other factors and avoid material fatigue and strength reduce of suspenders, Design uses HVMBDSQ7-73-type ball-hinge boom.
Dead loads+ live loads cases: The dead loads that affect the force of suspenders of arch bridges are mainly the self gravity of vertical and horizontal beams and secondary dead loads, the live loads that affect the force of suspenders are mainly vehicle load, impact load of vehicle and non-vehicle load.
[12] R.A.Collacott, Mechanical Fault Diagnosis and Condition Monitoring, London, 1997
[14] Malm.R,Andersson.A: The field testing and simulation of dynamic properties of a tied arch railway bridge.
The relative length of the side suspender is short, to improve its displacement caused by the change of the adaptation load, temperature and other factors and avoid material fatigue and strength reduce of suspenders, Design uses HVMBDSQ7-73-type ball-hinge boom.
Dead loads+ live loads cases: The dead loads that affect the force of suspenders of arch bridges are mainly the self gravity of vertical and horizontal beams and secondary dead loads, the live loads that affect the force of suspenders are mainly vehicle load, impact load of vehicle and non-vehicle load.
[12] R.A.Collacott, Mechanical Fault Diagnosis and Condition Monitoring, London, 1997
[14] Malm.R,Andersson.A: The field testing and simulation of dynamic properties of a tied arch railway bridge.
Online since: January 2019
Authors: Xiao Hong Wang, Yuan Hua Lin, Qiao Gang Hu, Shi Yu Zhong, Teng Dang, Hai Lun Wang
With the increase of particle size, the maximum damage factors appearing in the particles are: 0.0426, 0.0448, and 0.0507, which tend to increase gradually.
Effect of particle size on properties of SiCp/Al composites and its numerical simulation [D].
Mechanical Properties and Fracture Mechanism of Silicon Carbide Reinforced Aluminum Matrix Composites[J].
Effects of particle shape, content and matrix properties on compressive mechanical behavior of metal matrix composites[J].
Effects of die-pressing pressure and extrusion on the micro structures and mechanical properties of SiC reinforced pure aluminium composites[J].
Effect of particle size on properties of SiCp/Al composites and its numerical simulation [D].
Mechanical Properties and Fracture Mechanism of Silicon Carbide Reinforced Aluminum Matrix Composites[J].
Effects of particle shape, content and matrix properties on compressive mechanical behavior of metal matrix composites[J].
Effects of die-pressing pressure and extrusion on the micro structures and mechanical properties of SiC reinforced pure aluminium composites[J].
Online since: May 2014
Authors: Yong Gan, Han Chao Wang
Consequently, what other factors affect the TWBs’ forming ability, how they work on the sheet forming, and what quantitative relationship between the TWBs’ formability and the influence factors are deserved questions on research.
In the finite element simulation, the tools(punch, die and blank holder) were modeled as rigid materials, the difference of material thickness is reflected in the blank holders, the blank holders were split in two parts, the distance between two parts was half of the TWBs’ thickness, a circler draw bead was provided on the blank holder of 132.6mm diameter to restrict the flow of metal, Square sheet metal was regarded as a plastic material, and the size is 180 mm 180 mm, belytschko-tsay thin shell elements were applied for the blank and tools to reduce the calculate time, using the adaptive grid in the mesh, on the both sides of parent sheet were meshed under the different layer, which is ignoring the material properties of heat affected zone, the finite element model and the corresponding boundary conditions in the Dome test were shown in Fig. 2 and Table 1.
When two sides of the parent sheet have the same thickness, the weld-line doesn’t move, due to the two sides of parent sheet has the same property, the TWBs deformed uniform.
Formability Principles of linear-weld-line tailor-weld blanks(TWBs) with different thickness ratios, Chinese Journal of Mechanical Engineering, Vol 44(5) (2008), p. 215-219
Weld-bead movement and formability of tailor-welded blanks during forming automobile panels, Chinese Journal of Mechanical Engineering, Vol 40(9) (2004), p. 62-66
In the finite element simulation, the tools(punch, die and blank holder) were modeled as rigid materials, the difference of material thickness is reflected in the blank holders, the blank holders were split in two parts, the distance between two parts was half of the TWBs’ thickness, a circler draw bead was provided on the blank holder of 132.6mm diameter to restrict the flow of metal, Square sheet metal was regarded as a plastic material, and the size is 180 mm 180 mm, belytschko-tsay thin shell elements were applied for the blank and tools to reduce the calculate time, using the adaptive grid in the mesh, on the both sides of parent sheet were meshed under the different layer, which is ignoring the material properties of heat affected zone, the finite element model and the corresponding boundary conditions in the Dome test were shown in Fig. 2 and Table 1.
When two sides of the parent sheet have the same thickness, the weld-line doesn’t move, due to the two sides of parent sheet has the same property, the TWBs deformed uniform.
Formability Principles of linear-weld-line tailor-weld blanks(TWBs) with different thickness ratios, Chinese Journal of Mechanical Engineering, Vol 44(5) (2008), p. 215-219
Weld-bead movement and formability of tailor-welded blanks during forming automobile panels, Chinese Journal of Mechanical Engineering, Vol 40(9) (2004), p. 62-66
Online since: June 2010
Authors: Barry C. Muddle, Stavroula Moutsos, Russell King, Xiang Yuan Xiong
Introduction
The mechanical properties and microstructures of Al-Li-Mg-Cu alloys have been studied
extensively [1], due to the low density and high stiffness of alloys with the potential to replace
conventional aluminium alloys used in aircraft structures.
Understanding the microstructure and local composition distributions is important for optimizing the mechanical properties and designing new alloys.
The results in Figs. 4 and 5 show the effects of the two major factors that affect the measured compositions of alloys.
There are other factors that affect the measurement, such as the probing direction and evaporation rate.
Understanding the microstructure and local composition distributions is important for optimizing the mechanical properties and designing new alloys.
The results in Figs. 4 and 5 show the effects of the two major factors that affect the measured compositions of alloys.
There are other factors that affect the measurement, such as the probing direction and evaporation rate.
Online since: October 2013
Authors: Lin Hai Zhang, Yu Fu, Jian Hua Xie, Ming Hao Zhang, Shu Lin Hou
There are a large number of crop roots in the plow layer ,which was often affected by agricultural activities and natural factors.
The residual film also easy to block the crop seedling root growth, affecting crop seed germination and seedling growth, finally leading sprout deficiency.
Plastic film also impede the migration of soil capillary water, and has an adverse affect on soil bulk density, porosity and permeability, causing soil compaction and decline in soil fertility.
Since the accumulation of plastic film and the change of soil physical and chemical properties , root growth is retarded and crop growth was inhibited, eventually leading to production decline.
First author: Yu Fu (1989 - ) , male (Han), Shanxi, postgraduate, mainly engaged in mechanical design and manufacturing. fuyucau@126.com.
The residual film also easy to block the crop seedling root growth, affecting crop seed germination and seedling growth, finally leading sprout deficiency.
Plastic film also impede the migration of soil capillary water, and has an adverse affect on soil bulk density, porosity and permeability, causing soil compaction and decline in soil fertility.
Since the accumulation of plastic film and the change of soil physical and chemical properties , root growth is retarded and crop growth was inhibited, eventually leading to production decline.
First author: Yu Fu (1989 - ) , male (Han), Shanxi, postgraduate, mainly engaged in mechanical design and manufacturing. fuyucau@126.com.
Online since: October 2014
Authors: Michal Kraus, Darja Kubečková
The main factor was the thickness of the thermal insulation.
Calcium silicate masonry has high heat accumulation and excellent acoustic properties.
The correct thermal insulation must fulfill the following criteria: good thermal insulation properties, long-term durability, dimensional stability, low thermal expansion, vapor transmission, acoustical and mechanical properties, fire resistance, applicability and economic and environmental demands.
Grey polystyrene has better thermal properties about approximately 20 %.
Fiberboard increase rigidity and improve the thermal properties of the construction.
Calcium silicate masonry has high heat accumulation and excellent acoustic properties.
The correct thermal insulation must fulfill the following criteria: good thermal insulation properties, long-term durability, dimensional stability, low thermal expansion, vapor transmission, acoustical and mechanical properties, fire resistance, applicability and economic and environmental demands.
Grey polystyrene has better thermal properties about approximately 20 %.
Fiberboard increase rigidity and improve the thermal properties of the construction.
Online since: August 2011
Authors: Zhuang Chu, Cheng Bin Li, Xiang Deng, Wei Du
Result analysis
Fig.1 The relationship between the C content and Fig.2 The state diagram of the 1Cr17Ni2
the hardness of martensite stainless steels
The influence of the C content The main factor that affects the kit hardness is the C content in martensite after being quenched.Fig.1 is the relationship between the C content and the hardness of martensite after being quenched.
And ferrite influents greatly on the mechanics character of the 1Cr17Ni2 stainless clad steel, the composition of the steel satisfies the allowed range, which affects seriously the contents of ferrite, the organization after routine hardening have 5~20% or so ferrite [3].
It’s mechanical properties are lower because Cr17 steel can not be strengthened by phase transformation,So Ni, Co, N and other austenite forming elements must be added to ensure that the microstructure is austenite at solution treatment heating and martensite after quenching.
The steel may transform phase when heating if the 2% nickel is added,so the mechanical properties of steel can be improved by phase transformation strengthening.It is Cr17Ni2 martensite-ferrite stainless steel.
The Cr17Ni2 stainless steel has high corrosion resistance and high mechanical properties[4].
And ferrite influents greatly on the mechanics character of the 1Cr17Ni2 stainless clad steel, the composition of the steel satisfies the allowed range, which affects seriously the contents of ferrite, the organization after routine hardening have 5~20% or so ferrite [3].
It’s mechanical properties are lower because Cr17 steel can not be strengthened by phase transformation,So Ni, Co, N and other austenite forming elements must be added to ensure that the microstructure is austenite at solution treatment heating and martensite after quenching.
The steel may transform phase when heating if the 2% nickel is added,so the mechanical properties of steel can be improved by phase transformation strengthening.It is Cr17Ni2 martensite-ferrite stainless steel.
The Cr17Ni2 stainless steel has high corrosion resistance and high mechanical properties[4].
Online since: April 2015
Authors: Min Shan Liu, Tong Liu, Wen Fu Liang
(2) Access to the material properties: LBB assessment will use material properties and variation curve of properties.
Analysis of leak detection system should be based on the experiment and measured data of reactor, in addition, considering the impact of surface roughness, crack opening area, two-phase flow and other factors
T91 has good mechanical properties.
According to the rules, the J-integral of model under mechanical load and thermal load were calculated.
In A16 instructions, sodium leak generally choose the safety factor St=10.
Analysis of leak detection system should be based on the experiment and measured data of reactor, in addition, considering the impact of surface roughness, crack opening area, two-phase flow and other factors
T91 has good mechanical properties.
According to the rules, the J-integral of model under mechanical load and thermal load were calculated.
In A16 instructions, sodium leak generally choose the safety factor St=10.
Online since: May 2012
Authors: Hu Jia, Jin Zhou Zhao, Rui Liu, Wan Fen Pu, Tian Hong Zhao
Dispersion copolymerization was carried out in a 250mL three-neck separable flask equipped with mechanical stirrer, water bath, and a nitrogen inlet under nitrogen.
Effect of TDS on the Micromorphology of Microgel The salinity of injection water is a key factor to assure the performance of microgels both in surface installation and reservoir condition.
It suggests that the swell property of microgel cannot be seriously affected at this high TDS.
The basic petrophysical properties and fluid saturation of the sand pack is listed in Table2.
Table 2—Petrophical Properties of Sand Pack Used in Experiments L (cm) D (cm) PV (ml) ¢ (%) Krw (mD) Vo (ml) So (%) 59 2.48 95 33.35 2200 61 64.2 After the settled oil saturation was established, pump the formation water at constant flow rate of 2 ml/min to calculate the primary oil recovery for the first water flooding.
Effect of TDS on the Micromorphology of Microgel The salinity of injection water is a key factor to assure the performance of microgels both in surface installation and reservoir condition.
It suggests that the swell property of microgel cannot be seriously affected at this high TDS.
The basic petrophysical properties and fluid saturation of the sand pack is listed in Table2.
Table 2—Petrophical Properties of Sand Pack Used in Experiments L (cm) D (cm) PV (ml) ¢ (%) Krw (mD) Vo (ml) So (%) 59 2.48 95 33.35 2200 61 64.2 After the settled oil saturation was established, pump the formation water at constant flow rate of 2 ml/min to calculate the primary oil recovery for the first water flooding.
Online since: July 2012
Authors: Zi Li Yu, Ling Luo, Xing Wang, Yun Liu
GRT cannot be used in large quantity in a rubber compound because of its poor mechanical property and processability.
For a certain GRT/plastic compound, the adhesion between them is a key factor affecting properties.
The mechanical properties of GRT/HDPE using GRT-g-MAH, E/nBA/CO, SBS and EVA respectively as compatilizer were listed in Table 1.
The GRT and GRT-g-MAH have different structure and thermal properties.
The GRT-g-MAH can be used as a compatilizer for GRT/HDPE blending for achieving better mechanical property.
For a certain GRT/plastic compound, the adhesion between them is a key factor affecting properties.
The mechanical properties of GRT/HDPE using GRT-g-MAH, E/nBA/CO, SBS and EVA respectively as compatilizer were listed in Table 1.
The GRT and GRT-g-MAH have different structure and thermal properties.
The GRT-g-MAH can be used as a compatilizer for GRT/HDPE blending for achieving better mechanical property.