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Online since: May 2013
Authors: Feng Cang Ma, Yin Chen, Wei Li, Xin Kuan Liu, Xiao Hong Chen, Dai Hua He, Ping Liu
In clinical settings, it has repeatedly been demonstrated that HA coatings have osteo-conductive properties and that HA-coated implants have better fixation than uncoated implants under optimal surgical conditions [2].
For example, fibrous and plate-like HA particles have stronger adsorption properties due to their increased surface area [11], while HA whiskers present more favorable mechanical properties [12, 13].
The mechanisms by which temperature and other factors affect HA morphology during this procedure merit further investigation.
LeGeros, Properties of osteoconductive biomaterials: calcium phosphates, Clin Orthop Relat Res 395(2002) 81–98
Turner, Hydroxyapatite whiskers provide improved mechanical properties in reinforced polymer composites, Journal of Biomedical Materials Research - Part A 67(2003) 801-812
For example, fibrous and plate-like HA particles have stronger adsorption properties due to their increased surface area [11], while HA whiskers present more favorable mechanical properties [12, 13].
The mechanisms by which temperature and other factors affect HA morphology during this procedure merit further investigation.
LeGeros, Properties of osteoconductive biomaterials: calcium phosphates, Clin Orthop Relat Res 395(2002) 81–98
Turner, Hydroxyapatite whiskers provide improved mechanical properties in reinforced polymer composites, Journal of Biomedical Materials Research - Part A 67(2003) 801-812
Online since: July 2011
Authors: Emidio Nigro, Gaetano Manfredi, Anna Ferraro, Edoardo Cosenza, Giuseppe Cefarelli
FSE requires the choice of a performance level, the definition of design fire scenarios, the choice of heat flows models and several numerical thermo-mechanical analyses.
In this case the specific fire load density is: (2) Finally, according to EN1991-1-2, the design fire load density can be evaluated as: (3) where dq1=1.4 (factor taking into account the fire activation risk due to the size of the compartment), dq2=1.0 (factor taking into account the fire activation risk due to the type of occupancy) and dn=0.9 (factor taking into account the different active fire fighting measures i) are defined according to Italian code.
The fire scenario is significantly affected, among other things, by the geometry and ventilation conditions of the compartment.
Substructures Static scheme Fig. 5 – Thermo-mechanical model of the structure Analyses results.
Finally, the thermo-mechanical analyses in fire situations for the described case study, consisting of the car parks located at the ground floor of buildings of the C.A.S.E.
In this case the specific fire load density is: (2) Finally, according to EN1991-1-2, the design fire load density can be evaluated as: (3) where dq1=1.4 (factor taking into account the fire activation risk due to the size of the compartment), dq2=1.0 (factor taking into account the fire activation risk due to the type of occupancy) and dn=0.9 (factor taking into account the different active fire fighting measures i) are defined according to Italian code.
The fire scenario is significantly affected, among other things, by the geometry and ventilation conditions of the compartment.
Substructures Static scheme Fig. 5 – Thermo-mechanical model of the structure Analyses results.
Finally, the thermo-mechanical analyses in fire situations for the described case study, consisting of the car parks located at the ground floor of buildings of the C.A.S.E.
Online since: July 2018
Authors: Fritz Klocke, Kristian Arntz, Kai Winands, Nils Klingbeil, Jon Iñaki Arrizubieta Arrate, Mahesh Teli
This steel nowadays best satisfies most of the mechanical properties required for hot forging application; for instance, hot strength, temper resistance, creep strength, ductility, and toughness [2, 3].
Conventional welding processes however result in a large heat-affected zone (HAZ) near to the surface.
LMD process generates a small and limited HAZ, which makes the process less vulnerable to the degradation of the mechanical properties [10-13].
The overlap study has been important and critical to achieve the uniform microstructure without pores, hence mechanical properties.
A larger width may be a desirable factor to reduce the production time.
Conventional welding processes however result in a large heat-affected zone (HAZ) near to the surface.
LMD process generates a small and limited HAZ, which makes the process less vulnerable to the degradation of the mechanical properties [10-13].
The overlap study has been important and critical to achieve the uniform microstructure without pores, hence mechanical properties.
A larger width may be a desirable factor to reduce the production time.
Online since: October 2013
Authors: Martin Novák
The quality of products and their price are decisive factors in the successful sale of company products and growth of profit.
The profile provides information about exceptions in the profile, the texture of the profile and from the profile we can determine the extent of the primary plastic deformation zone (affected zone after machining).
Research into the causes cracking of aluminum alloys of Al – Cu during mechanical machining, Manufacturing Technology, vol. 12, no. 12, 47-51 pp
Surface Properties in Precise and Hard Machining, Manufacturing Technology, vol. 12, no. 13, 158-166 pp
The use of fractography in the analysis of cracking after formed workpiece blank mechanical machining from the AlCuSnBi alloy, Manufacturing Technology, vol. 12, no. 13, 174-178 pp
The profile provides information about exceptions in the profile, the texture of the profile and from the profile we can determine the extent of the primary plastic deformation zone (affected zone after machining).
Research into the causes cracking of aluminum alloys of Al – Cu during mechanical machining, Manufacturing Technology, vol. 12, no. 12, 47-51 pp
Surface Properties in Precise and Hard Machining, Manufacturing Technology, vol. 12, no. 13, 158-166 pp
The use of fractography in the analysis of cracking after formed workpiece blank mechanical machining from the AlCuSnBi alloy, Manufacturing Technology, vol. 12, no. 13, 174-178 pp
Online since: August 2011
Authors: Ruo Yu Zhang, Ying Lan Jiang, Jie Yu, Wan Chao Hu, Zhang Tao Yin
By analyzing the images data using some means, for example, statistics, images recognition or neural networks, a mass of important features related to quality attributes and safety factors of agricultural products are extracted.
It becomes less effective when quality attributes or safety factors are mainly determined by the intrinsic properties of products, such as composition and internal physical characteristics, which are not readily detectable at the surface.
Unlike machine vision, the spectroscopy allows us to measure many intrinsic properties of agricultural products, such as sugar content, acidity, or inner defects.
Then these corrected images may be used to extract information about the spectral properties of a sample.
Ariana et al. researched on using a hyperspectral imaging system for detecting pickling cucumbers’ defects caused by mechanical stress and observed the detection accuracy was affected by time after bruising.
It becomes less effective when quality attributes or safety factors are mainly determined by the intrinsic properties of products, such as composition and internal physical characteristics, which are not readily detectable at the surface.
Unlike machine vision, the spectroscopy allows us to measure many intrinsic properties of agricultural products, such as sugar content, acidity, or inner defects.
Then these corrected images may be used to extract information about the spectral properties of a sample.
Ariana et al. researched on using a hyperspectral imaging system for detecting pickling cucumbers’ defects caused by mechanical stress and observed the detection accuracy was affected by time after bruising.
Online since: July 2011
Authors: Li Hua, Cheng Song, Fa Can Wei, Jin Liu
Substrate processing includes rust and oil removal, sand blasting and cleaning.
2.1.1 Substrate selection
Different diamond brazing tools have different requirements for mechanical properties of the substrate.
We selected #45 steel as substrate material. 2.1.2 Substrate surface mechanical treatment A new chemical bond will be formed on the substrate surface in brazing.
The treatment quality of the substrate surface directly affects the quality of the product, which is one of the key factors to ensure fine results.
Table 1 Standard of the hydrochloric acid rust removal process g/L Name Hydrochloric acid Ammonium chloride Temperature Time Process parameters 150 2 Room temperature Until rust is completely removed Contaminated oil in industry is nothing more than the 3 categories of mineral oil, vegetable oil and animal oil, or 2 categories of saponifiedoil (animal oil and vegetable oil) and non-saponifiedoil (mineral oil) by chemical properties.
We selected #45 steel as substrate material. 2.1.2 Substrate surface mechanical treatment A new chemical bond will be formed on the substrate surface in brazing.
The treatment quality of the substrate surface directly affects the quality of the product, which is one of the key factors to ensure fine results.
Table 1 Standard of the hydrochloric acid rust removal process g/L Name Hydrochloric acid Ammonium chloride Temperature Time Process parameters 150 2 Room temperature Until rust is completely removed Contaminated oil in industry is nothing more than the 3 categories of mineral oil, vegetable oil and animal oil, or 2 categories of saponifiedoil (animal oil and vegetable oil) and non-saponifiedoil (mineral oil) by chemical properties.
Online since: December 2013
Authors: Yue Zhong Ye, Cheng Cheng Wang, Tong Chao Liu
Corrosion mechanism of bearing pile
Freezing and thawing cycle mainly affect concrete’s pore structure, permeability and reaction of the salt solution, which caused concrete destruction and damage.
The design criterions are established by the durability, mechanical properties and the workability which is implementing the harmonization of high durability, high performance, easy maintenance, high workability and environmental compatibility
(a) (b) (c) (d) (e) (f) Fig.4 Construction progress Through the field detection and monitoring for nearly three years, the results are as follows: ① Cushion cap’s potential and current are changing in a small range through the anode ladder test, The analysis shows the anode ladders are in good condition according to the critical value judged by the anode ladder corrosion potential and current ,so the concrete iron are out of corrosion. ②The test voltage is great, through the chloride ion electrode test and the analysis of the relationship between the response of chloride ion content in the negative logarithm and chloride ion potentiometric response of electrode sensor, which explaining that the chloride ion content is still at a very low level. ③The influencing factors of the protective effect and site environmental
Foam concrete is a porous material which formed with mechanical methods.
(1) Raw materials and mix proportion of foam concrete 1) Raw materials ①The ordinary port land cement is from the group of Shuangma in Sichuan Province , 42.5R; ②The high alumina cement is from refractory material factory in Yindu ,Guizhou Province , A-50; ③The foaming agent is a kind of solid foaming agent whose type is CCW-95 developed by China Building Materials Academy; ④The water reducing agent whose type is FDN II is produced by the group of Panshuang in Chengdu; ⑤The fly ash is I class of Huaming brand. 2) Mix proportioning (Shown in table 2) Table 2 the mix proportion of foam concrete Ordinary port land cement(kg) High alumina cement(kg) Fly ash (kg) water reducer (kg) CCW-95 foaming agent (kg) W/C 60 8 25 0.6 3 0.5 (2) Properties testing of foam concrete 1) The preparation of foam concrete: First, make foaming agent aqueous solution prepare into a bubble with physical methods , Then add the foam into the slurry which is constituent
The design criterions are established by the durability, mechanical properties and the workability which is implementing the harmonization of high durability, high performance, easy maintenance, high workability and environmental compatibility
(a) (b) (c) (d) (e) (f) Fig.4 Construction progress Through the field detection and monitoring for nearly three years, the results are as follows: ① Cushion cap’s potential and current are changing in a small range through the anode ladder test, The analysis shows the anode ladders are in good condition according to the critical value judged by the anode ladder corrosion potential and current ,so the concrete iron are out of corrosion. ②The test voltage is great, through the chloride ion electrode test and the analysis of the relationship between the response of chloride ion content in the negative logarithm and chloride ion potentiometric response of electrode sensor, which explaining that the chloride ion content is still at a very low level. ③The influencing factors of the protective effect and site environmental
Foam concrete is a porous material which formed with mechanical methods.
(1) Raw materials and mix proportion of foam concrete 1) Raw materials ①The ordinary port land cement is from the group of Shuangma in Sichuan Province , 42.5R; ②The high alumina cement is from refractory material factory in Yindu ,Guizhou Province , A-50; ③The foaming agent is a kind of solid foaming agent whose type is CCW-95 developed by China Building Materials Academy; ④The water reducing agent whose type is FDN II is produced by the group of Panshuang in Chengdu; ⑤The fly ash is I class of Huaming brand. 2) Mix proportioning (Shown in table 2) Table 2 the mix proportion of foam concrete Ordinary port land cement(kg) High alumina cement(kg) Fly ash (kg) water reducer (kg) CCW-95 foaming agent (kg) W/C 60 8 25 0.6 3 0.5 (2) Properties testing of foam concrete 1) The preparation of foam concrete: First, make foaming agent aqueous solution prepare into a bubble with physical methods , Then add the foam into the slurry which is constituent
Online since: July 2012
Authors: Ahmad Zakiah, Martin P. Ansell, Dave Smedley, Paridah Md Tahir
The mechanical properties of adhesive materials change over time, especially when they are subjected to long-term loading regimes.
Ltd) Epoxy-based structural adhesives have emerged as a critical component for bonding pultruded rods and plates with other materials due to their excellent adhesion properties, high mechanical strength and good chemical properties.
The creep test specimens conformed to British Standard BS EN ISO 178 (Plastic- Determination of flexural properties) (2003).
Bending properties of epoxy-based adhesive.
Ashby: Material selection in mechanical design, Butterworth-Heinemann, 2nd Edn. (1999)
Ltd) Epoxy-based structural adhesives have emerged as a critical component for bonding pultruded rods and plates with other materials due to their excellent adhesion properties, high mechanical strength and good chemical properties.
The creep test specimens conformed to British Standard BS EN ISO 178 (Plastic- Determination of flexural properties) (2003).
Bending properties of epoxy-based adhesive.
Ashby: Material selection in mechanical design, Butterworth-Heinemann, 2nd Edn. (1999)
Online since: April 2016
Authors: Yan Mo, Dong Zhe Wang, Bin Jiang, Yong You Li, Hai Ding Liu, Chun Guang Wang, Jin Tai Wang
Difference in corrosion potential between the fusion zone, heat-affected zone and base metal in an alloy 718 weld was the key factor for galvanic corrosion.
Other factors also have important influences on corrosion property, such as composition, pH value and so on [7,10].
Purchasing agents often define standards of chemical composition and mechanical property in the Technology Agreement, but only give a vague description of grain size.
Solidification is also considered as the crucial processing for grain growth with the greatest impact to mechanical properties.
The properties of the passive films seem improved with grain size.
Other factors also have important influences on corrosion property, such as composition, pH value and so on [7,10].
Purchasing agents often define standards of chemical composition and mechanical property in the Technology Agreement, but only give a vague description of grain size.
Solidification is also considered as the crucial processing for grain growth with the greatest impact to mechanical properties.
The properties of the passive films seem improved with grain size.
Online since: December 2012
Authors: Sławomir Kciuk, Paweł Martynowicz, Arkadiusz Mężyk
These can not be fulfilled by the classical suspension systems equipped with passive springs (torsional rollers) and shock absorbers, characterised by the fixed operation properties.
MR shock absorbers utilise the specific properties of MR fluids, which are non-colloidal suspensions of high-concentration soft magnetic particles in nonmagnetic carrier fluids.
Selection of materials is a very important question in any designing process, while in the MR valve design it is of special interest, because both magnetic and mechanical properties have to be thoroughly analysed to obtain satisfactory operational results.
Along with excellent magnetic characteristics, such a composition exhibits moderately advantageous mechanical properties (hardness HRC 20, yield limit of 435 MPa, ultimate strength of 814 MPa, max. elongation of 9%).
This was due to the fact that high shear rate is a critical factor for turbulent flow induction.
MR shock absorbers utilise the specific properties of MR fluids, which are non-colloidal suspensions of high-concentration soft magnetic particles in nonmagnetic carrier fluids.
Selection of materials is a very important question in any designing process, while in the MR valve design it is of special interest, because both magnetic and mechanical properties have to be thoroughly analysed to obtain satisfactory operational results.
Along with excellent magnetic characteristics, such a composition exhibits moderately advantageous mechanical properties (hardness HRC 20, yield limit of 435 MPa, ultimate strength of 814 MPa, max. elongation of 9%).
This was due to the fact that high shear rate is a critical factor for turbulent flow induction.