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Online since: November 2013
Authors: Ming Huang, Quan Lv, Wei Dong Huang
Epoxy asphalt is consisted of asphalt, epoxy resin, curing agent and other additives .This modified asphalt is used as a binding and bonding material, the formation of a typical thermosetting materials after reaction curing enable the physical and mechanical properties of asphalt a qualitative leap, besides, the adhesion of the material, tensile strength and elongation rates are also significantly improved .The conventional thermoplastic of the asphalt is changed fundamentally , as a result ,the fatigue resistance increases in an order of magnitude [3].However ,there is no precedent in applying the epoxy asphalt in pavement construction , this study is aimed at putting forward such a conception ,namely , to design a mixture tailored to specification for pavement design.
The characteristics of aggregate used in the test are shown in Tab.1 and Tab.2: Tab.1 Property index of aggregates Test Index Basalt aggregate Standard requirement Crushed stone value/% 23.2 <28 Weared stone value(Los Angeles) /% 21.3 <30 Content of flat particle /%(size between 4.75~13.2mm) 10.3 <20 Sand equivalent value(size<2.36mm)/% 91.0 >60 Angularity /% size between 2.36~4.75mm >30 >30 size<2.36mm 49.2 Tab.2 Aggregate density Size(mm) Mineral powder 0~3 3~5 5~10 10~13 Density(g·cm-3) 2.788 2.835 2.866 2.875 2.903 In order to reach the porosity of 3% or even lower, the selection of gradation is based on theoretical calculations and previous experience.
Conclusions and recommendations Although the epoxy asphalt can meet the requirements of airport pavement, there are many aspects of deficiencies and issues need to be saved and studied: 1, China's steel bridge deck pavement has only just started using epoxy asphalt concrete, there is no complete system for designing epoxy asphalt concrete steel bridge deck pavement and experience is lacking. 2, The asphalt pavement design specifications need more accumulated experience, and mechanics - empirical method should be combined with airport pavement mixture method using epoxy materials of high modulus. 3, The defects of the epoxy asphalt is the problem about mixing and construction, temperature is an important factor affecting the performance of epoxy asphalt mixture, the reasonable distance between the mixing plant and the construction site and construction organizations is indispensable to guarantee the good performance. 4, There are many types of epoxy resins and curing agents with different
properties, suited surroundings, temperature and construction process.
In addition, reasonable formulation of epoxy asphalt can also be developed to become a stress-absorbing layer with low modulus, on the one hand, because the property is similar, the interlayer bonding is better, on the other hand, reflective crack can also be reduced due to the curing.
Online since: February 2012
Authors: Guo Qian Zhao, Hong Tian Zhang, Rui Guang Geng
Exciting Force of Combustion Engine When the combustion engine runs, it is affected by all kinds of excitations.
Boundary conditions of the base could be changed by changing supporting rigidity, and then rigidity of flexible base was changed to simulated different property structural support.
Bushing force unit was applied between diesel rigid body and flexible base, rigidity factor and damping factor were set along the direction of, , .
The results of simulation calculation were very anastomotic with the results theoretical calculation Passive vibration isolation system of combustion engine was affected severely by the rigid character of flexible base.
Beijing: mechanical industry press, 2007: 85-93
Online since: July 2017
Authors: Katharina Arnaut, Franz Josef Wöstmann, Matthias Busse, Jan Clausen, Armin Schmid, Maximilian Koerdt, Adrian Struss
Duroplastic matrix systems show adverse properties, such as brittleness, time-intensive production cycles, and limited temperature stability [3].
On the one hand, the different material properties have to be considered, whereas, on the other hand, the type of joining method used can lead to stress concentrations in the joint area.
For the production of a hybrid composite within one single step in HPDC, both the process parameters and the material properties of PEEK and aluminum have to be considered.
Thus, the PEEK must show optimized mechanical properties as a result of an increased degree of crystallinity.
WANG, Tensile Properties of CFRP and Hybrid FRP Composites at Elevated Temperatures, Journal of Composite Materials, Vol. 43, No. 04 (2009)
Online since: October 2014
Authors: Mao De Li, Zhi Song Zheng, Cong Qiu
With the rapid development of desktop computer, its motherboard power consumption has become an important factor.
From these figures, it is easy to observe the temperature rising properties of the computer motherboard under the four conditions.
However, this does not affect our observations of temperature changing of computer motherboard.
American Society of Mechanical Engineers. 2005: 431-437 [4] He Yujie, Liu Lei.
Online since: April 2023
Authors: R.A. Khuramshina, V.I. Muratova
The release of the solid phase depends on the physical and chemical characteristics of the oil, temperature, rheological properties, design features of pipelines and a number of other factors, and the intensity of sediment accumulation depends on the technical and operational and design features of the tanks.
The choice of rational and optimal ways to combat ASPO and the evaluation of the effectiveness of various methods depends on many factors, in particular, on the fractional composition of solid hydrocarbons in oil, its physical and rheological properties, temperature, duration of paraffinization, design features of the pipeline (especially offshore fields) , etc.
Saltykov, et.al., Influence of ultrasonic treatment conditions on the properties of paraffin oil, Equipment and technologies for the oil and gas complex.
Mullakaev, Influence of Ultrasound and Heat Treatment on the Rheological Properties of Ust-Tegusskoe Oil, Chemical and Petroleum Engineering.
Mousavi, Effect of ultrasonic irradiation on rheological properties of asphaltenic crude oils, Petroleum Science.
Online since: September 2015
Authors: Wen Jie Peng, Yue Wang, Huan Xue, Jia He
Although there is difference between the ultrasonic and conventional fatigue tests, for some cases, what is concerned is the difference in fatigue properties of high strength steel in two different smelting processes and the comparison of the fatigue properties before and after the smelting process refined as shown in Fig.7 can be conducted through ultrasonic fatigue tests.
Ultrasonic fatigue properties of a high strength steel at two smelting processes. 5.
Specimen size effects on gigacycle fatigue properties of high-strength steel under ultrasonic fatigue testing.
Furuya, et al. 1010-cycle fatigue properties of 1800MPa-class JIS-SUP7 spring steel.
Influence of loading frequency on the high cycle fatigue properties of AlZnMgCu1.5 aluminium alloy.
Online since: May 2015
Authors: Imran Syakir Mohamad, Mohd Ridzuan Nordin, Jin Li Li, Mohd Haizal Mohd Husin
Synthesis and Characteristics of Mesoporous SBA-15 Influence by HMTA as an internal pH Modifier Mohd Haizal Mohd Husin1,a, Mohd Ridzuan Nordin2,b, Imran Syakir Mohamad1,c and Jinli Li3,d 1Advanced Materials Group (A-MAT), Faculty of Mechanical Engineering, UniversitiTeknikal Malaysia Melaka (UTeM) 76100, Durian Tunggal, Melaka, Malaysia, 2Faculty of Industrial Science and Technology, University Malaysia Pahang (UMP) 26300 Gambang, Pahang, Malaysia 3Laboratory of Catalysis and Materials Science, South-central University for Nationalities (SCUN), Wuhan 430074, China ahaizal@utem.edu.my, bmridzuan@ump.edu.my, cimran@utem.edu.my, djinlinli@hotmail.com Keywords: SBA-15, HMTA, pH modification Abstract.
In addition, the physical properties of SBA-15 showed a decrease of surface area and pore size due to the increase in the pH.
Many studies have indicated that several factors of pH and acid species could affect the interaction between organic micelles and inorganic species and consequently influence the final structure of the mesoporous materials during the self-assembly process [4-5].The acidic environment (pH value) of the whole synthesis procedure was variable and influenced by some factors such as the protonation of the surfactant and the hydrolysis of the metal salt according to Li and co-worker [6].
The physicochemical properties of SBA-15 and SBA-15 additional HMTA samples are summarised in Table 2.All SBA-15 synthesised at different initial acidity of HCl, was found that the surface, pore volume and pore size greatly decreased respectively to decrease of acidity of HCl solution (increasing of pH).
In addition, the physical properties ofSBA-15 showed a decrease of surface area and pore size due to the increase in the pH (low acidity).
Online since: December 2005
Authors: Akinori Fujinami, Shigenobu Ogata, Yoji Shibutani, Kenichi Yamamoto
Molecular Orbital Study on Adsorption Process of Silica Cluster on Polyimide Surface Akinori Fujinami1 , Shigenobu Ogata 1,2 , Yoji Shibutani1 and Kenichi Yamamoto 3 1 Department of Mechanical Engineering and Systems, 2Handai Frontier Research Center, Graduate School of Osaka University, Osaka 565-0871, Japan, E-mail: fujinami @comec.mech.eng.osaka-u.ac.jp, ogata@mech.eng.osaka-u.ac.jp, sibutani@mech.eng.osaka-u.ac.jp 3 Corporate Manufacturing Innovation Division, Matsushita Electric Industrial Co., Ltd., Osaka 571-8502, Japan, E-mail: yamamoto.kenichi@jp.panasonic.com Keywords: adsorption process, polyimide, silica cluster, minimum energy paths, sorption energy Abstract.
Understanding the bonding mechanisms at the interface between a silica film and an aromatic polyimide substrate allows us to control the mechanical and chemical stabilities of such interfaces which, in turn, facilitate control of the reliability of the devices [1,2].
Since the thickness of each component layer in such devices is generally less than one micron, atomic-level factors of adhesion and adsorption directly affect these interfacial properties.
Online since: October 2010
Authors: Yang Zhi Chen, Lei Hou Sun, Di Wang, Yong Qiang Yang, Jiang Ding
Investigation into the Process of Selective Laser Melting Rapid Prototyping Manufacturing for Space-curve-meshing-wheel Yangzhi Chena , Leihou Sun b, Di Wang c , Yongqiang Yangd and Jiang Dinge School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China a meyzchen@scut.edu.cn, bqfllslh@163.com, cscut061389@163.com d meyqyang@scut.edu.cn, estudent239@126.com Keywords: Selective Laser Melting, Space-Curve-Meshing-Wheel, Transmission mechanism Abstract.
Introduction With the developing trend of mechanical device miniaturization, manufacturing technology of complex micro-3D parts becomes especially important.
The strengthened structure coincides with the root of tines, and will not affect the meshing of the tines.
To obtain optimized process parameters, an orthogonal experiment scheme with 6 factors and 3 levels is designed, as shown in Table 1.
Emmelmann: Reproducibility for properties of selective laser melting.
Online since: July 2012
Authors: Yu Long Lin
It’s just a downhole tools in drilling, but its quality directly affects the cost of drilling and drilling quality[1].
There are many factors affecting product quality of three-cone drill bit, and the design aspects are essential.
Its reasonable directly affects the work state and life of bearing.
The basic properties of the design bit product could be analyzed and forecasted in the design stage that makes designers more confidence.
[5] Liang Shangming, Yin Guofu: modern mechanical optimization methods, Beijing: chemical industry press, 2005
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