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Online since: October 2004
Authors: You Tang Li, Zhi Yuan Rui, Chang Feng Yan
Fracture, erosion and abrasion are the three key kinds of failure for mechanical parts and engineering components.
Fracture is happened unexpectedly usually and often causes a great loss of life and property.
The relations of critical stress intensity factor to stress amplitude in fatigue fracture are shown in Fig.7.
The factors affecting to the cycle times of fracture include the geometric parameters of notch and the presetting deflection, which focus on the cycle times of fracture.
The higher the mechanical intensity of material, the smaller the presetting deflection should be chosen.
Online since: October 2014
Authors: Hong Gen Qin, Shuai Shuai Geng, Chao Ming Pang, You Hua Tao
Dry density is one of the most important physical properties, which affects their strength, thermal conductivity, water absorption, softening coefficient.
Binder material is the main source of foam concrete strength, also is the primary influencing factors.
At the same time, the physical and mechanical properties of foam concrete can be obviously improved.
Cellular concrete part 2 physical properties.
Influence of filler type on the properties of foam concrete, J.
Online since: December 2014
Authors: Jaimal Singh Khamba, Davinder Singh, Tarun Nanda
Exchange of information and resources with different partners are important factors in the innovation process.
Two factors mainly characterize the development of the model of cooperation to the Triple Helix: the capitalization of knowledge and striving for regional development by the university as a third mission.
A specific study by James [60] on fiscal and financial factors that affect MSMEs in ASEAN (Malaysia, Indonesia, Philippine, Thailand and Singapore) exposed that most small and medium entrepreneurs in the region use personal savings for initial funding.
Following factors (TI Factors) are identified from an extensive literature review which affects manufacturing performance of MSMEs: 1.
[60] James, K. (1986) ‘Fiscal and financial factors affecting small and medium business improvement in the ASEAN region’, ASEAN Economic Bulletin, pp. 153-167
Online since: November 2016
Authors: Dagoberto Brandão Santos, Paula Oliveira Malta, Iane Dutra Moutinho, Davi Silva Alves, Aline Vasconcelos Ferreira
Introduction The ferritic stainless steel represents materials with great application potential in several industries sectors, due to their good mechanical properties and corrosion resistance.
The properties of these polycrystalline materials may be modified by mechanical and thermal processing, between the hot, cold rolling and annealing.
The samples for EBSD examination were prepared by the classical procedures of mechanical grinding and polishing.
Recrystallization Kinetics The recrystallization kinetics was evaluated by logarithmic graphic obtained from the equality, known as JMAK equation, in which k is a pre-exponential factor and n is the Avrami exponent [4]: XV=1- e(-ktn) (2) This linearization of XV as a time function was realized from microhardness (Fig. 3), KAM (Fig. 4) and GOS (Fig. 5) data, which the slope corresponds to n (Tab. 2).
The Vickers microhardness evolution is directly affected by recovery, recrystallization and grain growth process.
Online since: December 2006
Authors: Jin Heung Kim, Nak Kyu Chung, Chang Oh Kim
A Study on the Cooling Characteristics of TMA Clathrate Compound with Additives Chang-Oh Kim 1, a , Jin-Heung Kim 2, b and Nak-Kyu Chung3, c 1 Department of Mechanical Design Engineering, Graduate School, Chosun University, #375 Seosuk-dong, Gwangju 501-759 Republic of Korea 2 Department of Mechanical Engineering, Chosun University, #375 Seosuk-dong, Gwangju 501-759 Republic of Korea 3 Department of Mechanical Design Engineering, Chosun University, #375 Seosuk-dong, Gwangju 501-759 Republic of Korea a cokim@stmail.chosun.ac.kr, bjhbkim@chosun.ac.kr, cnkcung@chosun.ac.kr(Co.
However, in case of ice storage system that water is used as low temperature latent heat storage material, refrigerator capacity is increased and COP (performance factor) is decreased because refrigerator is operated at low temperature due to supercooling of water in the course of phase change from solid to liquid.
And physical properties according to temperature are stable and congruent melting phenomenon is occurred without phase separation and it has relatively high latent heat .[1] But clathrate compound still has supercooling problem occurred in the course of phase change and supercooling should be minimized because it affects efficiency of equipment very much.
And phase change temperature is varied by adding ethanol because of colligative properties of solution.
Online since: February 2014
Authors: Hong Yan Chu, Lei Su, Xiao Lin Zhang, Rui Qing Shen, Li Gang Cai
There are so many factors affecting the printing quality,such as the printing pressure, the characteristics of printing paper, the physical parameters of the ink, the property of fountain solution and so on.
And domestic and foreign scholars carry on the discussion and research about the effect of rotational speed of roll, degrees of impression and ink and material property of the substrate [1-3].
References [1] M Pudas, J Hagberg and S Leppavuori, Printing parameters and ink components affecting ultra-fine-line gravure-offset printing for electronics applications[J], Journal of The European Ceramic Society. 10 (2004) 2943-2950
Journal of Mechanical Science and Technology. 1(2010) 293-296
College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology,2013
Online since: September 2008
Authors: Patrick Fiorenza, Francesco La Via, Marco Mauceri, Ruggero Anzalone, Giuseppe Condorelli, Andrea Severino, Giuseppe Abbondanza, Gaetano Foti, Giuseppe D'Arrigo, Corrado Bongiorno
Introduction Silicon carbide (SiC) is considered to be one of the alternative power semiconductor materials to Si, due to its excellent properties such as wide band gap, high breakdown field, and high thermal conductivity [1].
Furthermore, one important property of 3C-SiC is that it can be grown on large diameter Si (silicon) substrates.
In fact, the simple replacement of SiH4 with SiHCl3 (TCS) produces a significant alteration of the chemical species involved in the reaction, whose key factor is represented by the shift from Si to SiCl2 as the most important siliconcontaining precursor.
TEM sample preparation was not so difficult as in the case of thicker SiC films and was performed via mechanical and ion thinning prior to analysis.
These values are affected by the presence of the hetero-interface which is full of defects (mainly micro-twins and stacking faults) that increase the true rocking curve value.
Online since: October 2017
Authors: Meng Jin Fan, Wen Ge Jiang, Yu Zhou, Yi Hao Luan, Qian Zang, Dong Xia Zhang, Cheng Yuan Shang
Because of the extraordinary properties such as extremely good molecular design flexibility, no by-products generated and near-zero volumetric change during curing, excellent mechanical properties, high thermal stability and low flammability [1-3], polybenzoxazine is thought to be a promising candidate in high performance composite matrices [4, 5].
In this study, a cycloaliphatic epoxy resin, a monofunctional benzoxazine precursor based on phenol, formaldehyde and aniline, and a high molecular thermoplastic phenoxyl resin were used to improve the processing ability of the resin system; in addition a flame retardant containing phosphorus and nitrogen elements was also added to the resin system to improve its flame retardant property.
Since the curing condition may significantly affect the final performance of the cured products, it is necessary to learn about the curing kinetics of the resin systems prior to application.
In the case of relatively low reaction temperature (e.g. < 100 oC) the reaction rate of this resin system was quite low, and the complex viscosity was mainly affected by the temperature: the complex viscosity of BZ501-1 is about 103 Pa·s at 50 oC and decreases to 2-3 Pa·s at about 125 oC.
In general, k(T) can be represented through the Arrhenius equation [11]: (3) where A is the pre-exponential factor, Ea is the apparent activation energy, R is the universal gas constant, and T is the absolute temperature.
Online since: May 2012
Authors: Wen Ting Wu, Yi Ren, Ao Shen
The core of creative economy is the knowledge-intensive and technology-intensive emerging service, which is a kind of innovative economic form that can realize the increases in wealth and improves the employment growth point with the use of intellectual property rights.
Creative Industry The creative industry refers to the enterprises which have their origin in individual creativity, skill and talent and the activities which have a potential for wealth and job creation through the generation and exploitation of intellectual property.
Lack of characteristics in the overall design of the creative park with poor identifiability.The design idea, whose designer is eager for quick success and disregards the importance of the sustainable development of space, may work out a mechanical design concept and a rather regular layout.
While giving prominence to the theme of space function, it also highlights the theme characteristics of building facade and spatial property, which makes the park significantly different from other creative parks.
This article starts from the study on the strategies of the spatial development mode of the creative park as well as the objective factors of the creative park, combines the analysis of some cases, sums up the design concepts and innovative design ideas of the creative park space and points out the following four spatial development modes for the creative park: the integration mode of large indoor creative markets and creative industries, the thematic industrial park mode after the subdivision of creative industries, the spatial finished mode and special spatial modes.
Online since: October 2004
Authors: Mehran Kadkhodayan
Numerical prediction of springback and side-wall curl in U-bending of anisotropic sheet metals Mehran Kadkhodayan Department of Mechanical Engineering, The University of Azad Mashhad, Iran kadkhoda@ferdowsi.um.ac.ir Keywords: Springback, Side-Wall Curl, Anisotropic Sheet Metal, U-Bending Abstract.
An anisotropy property for material is considered.
Although the main aim of all investigations was to explore the effect of different factors on the springback results, some methods, however, have been suffering from particular difficulties.
Hence, it seems that the area is still open and researchers may continue their studies to evaluate numerical factors influencing springback more effectively.
It is found from these results that the holder force affects on the springback considerably.
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