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This paper presents a conclusion drawn by adopting laser processing technology to form striated non-smooth surface of nodular cast iron and study the factors that affect the wear resistance at the normal temperature by means of single factor testing and orthogonal testing.
The parameters of laser processing are as belows: electric current 30A, velocity 0.5mm/s, frequency 16Hz, pulse width 20ms. 1.2 Experimental method The factors affecting wear mainly involve material surface and external environment.
The material surface factors include the hardness of test-piece, the shape and density of the geometric unit of non-smooth surface.
The single factor test is conducted on the factors affecting wear to find the major factors for orthogonal experiment and achieve the optimal processing conditions.
[3] Zhang Song, Wang Maocai, Wu Weitao, The Organization and Tribology Properties of Laser cladding T iC/ Ti[ J ].

The Study on Mechanical Properties in Narrow-Gap Welds for SA312 TP347 Seung-Wan Woo1,a, Choon-Yeol Lee1,b, Jae-Do Kwon1,c, Young-Hwan Choi2,d and Ho-Sang Shin2,e 1 Department of Mechanical Engineering, Yeungnam University 214-1 Dae-dong, Gyongsan, Gyongbuk 712-749, Korea 2 Korea Institute of Nuclear Safety 19 Kusong-dong, Yusong-ku, Taejon 303-338, Korea a lagmisia@yumail.ac.kr, cylee@yu.ac.kr (Corresponding Author), cjdwon@yu.ac.kr d yhchoi@yumail.ac.kr, ehsshin@kins.re.kr Keywords: Narrow-gap weld, Stainless steel, General weld, Repair weld, Stress corrosion crack Abstract.
Performed are various mechanical tests to investigate microstructure, tensile strength and so on.
It is verified that the mechanical properties of stainless steel are slightly changed after repair welding process.
In addition, this welding process becomes a major time consuming factor in the whole construction period, because it generally requires more than 7 months to complete installation of the pipes.
Summary This study performed various tests to investigate mechanical properties of the general welding material (SAW) and repair welding material (SRW) using the stainless steel of SA312 TP347, which is used in the pipe system of a nuclear power plant by applying a narrow-gap welding method.

The properties needed to be studied, not only from the mechanical point of view but also from that of sustainability.
Mechanical properties are also influenced by the composition, structure and number of defects in a fibre.
The factors that affect elongation of a fibre can be attributed to the orientation, high degree of crystallisation and the angle of the micro fibrils with respect to the axis of the fibre [5].
To prepare the specimen, these coconut husks were retted carefully to obtain the fibre for analysis for its mechanical properties.
According to the tensile tests, the mechanical properties of coconut fibre are rather close to those of less ductile polymer.

Effect of cryogenic treatments on mechanical properties of 2A11 aluminum alloy were studied.
The influences of different process parameters on mechanical properties of 2A11 aluminum alloy were compared, and the results showed that cryogenic treatment could improve mechanical properties of 2A11 aluminum alloy.
Since then it became a supplementary process to improve the mechanical properties of metals.
Microstructures and mechanical properties of metals in cryogenic treatment drew attention of the researchers.
In the case of 2A11 aluminum alloy, the obtained results suggest that cryogenic treatment produced positive effects on the mechanical properties, and the results are strongly affected by the treatment parameters.

The calculation formula of horizontal stiffness of isolator is derivated,and the mechanical properties are researched.
The research results show that:besides the horizontal isolating property of common rubber isolators,the prestress rubber isolator has also properties of reducing vertical deformation, limiting horizontal displacement and resisting tension.Moreover,the prestress isolator has also a certain vertical isolating affect because of the improve of rubber thickness.
To improve the mechanical properties of RIs,a lot of researches have been done recent years.Su et al[7,9] studied the mechanical properties of high damping rubber(HDR) isolators,which can increase the energy dissipation capacity of structures; Skinner et al[1] set a flexible lead-core in the isolator,which is called lead-core rubber isolator, to increase the damping and initial lateral stiffness.The lead-core rubber isolator can reduce the lateral displacement of structures during strong earthquakes ,and improve the stability of structures during wind and minor earthquakes.Kang[4] proposed and researched the fiber reinforced rubber isolator.Their research results show that the steel plates can be replaced by a fiber reinforcement to reduce the weight of isolators.Zhang[6]and Cui[8] proposed a rubber isolator with a steel bar inside to limit the displacement of isolator,and introduced its restoring force model.
The purpose of this paper is to propose a new rubber isolator,namely PRI,to deduce the calculation of stiffness,and to research its mechanical properties.
(a) Making holes (b) Exerting prestress (c) Exerting vertical loads (d) Horizontal deformation Fig.2 Functional diagram of prestress isolator Vertical bearing ability and vertical stiffness The vertical bearing ability is one of the important mechanical properties of isolator.Under the application of vertical static loads,the mechanical mechanism of PRI is similar to that of normal RI.Hence,its calculation method of vertical bearing ability can consult that of normal RI as follow: (1) where,is the limiting average compressive stress of isolator;is the yield strength of steel plate;、are the thickness of single steel plate and rubber layer,respectively; is the first shape factor of isolator,which is the ratio of the active carrying area and the free face of each rubber layer,and its value can be obtained by: (2) where, is the diameter of active carrying area,is the diameter of hole

This study is conducted to determine the effect of five variables on mechanical properties of geopolymer binders.
The mechanical properties considered are compressive strength, porosity and density.
A statistical analysis was performed to determine the statistically significant factors and therefore this table has no units.
Geopolymer binder (GB) properties are highly dependent upon the type, ratios and concentrations of mixing constituents.
Nikraz: Properties of fly ash geopolymer concrete designed by Taguchi method, Material and Design, vol. 36 (2012), pp. 191-198 [10] S.

(a) Compressive strength test (b) Flexural strength test Fig. 1 Mechanical properties test 3 Results and Discussions  In this paper, the test is based on the specimen curing age of 28 d, and the compressive strength (R1) and flexural strength (R2) are used as the response values to study the effect of test factors on the mechanical properties of premixed dry-mixed mortar with iron tailings., and the test results are shown in Table 1.
Therefore, the cement-sand ratio is the key factors affecting the compressive strength of mortar.
Study on the properties of fine-grained tailings [J].
[13] Nakkeeran G, Krishnaraj L, Bahrami A, et al.Machine learning application to predict the mechanical properties of glass fiber mortar[J].Adv.
Machine learning application to predict the Mechanical properties of Glass Fiber mortar[J].

Two heavy metals (Mn, Ni) were added in different amounts to find out the influence of dosage of heavy metal on the mechanical properties of the matrices and the leachability.
Increasing of addition of heavy metals led to decrease of mechanical properties of matrices.
The physical fixation is linked with the mechanical properties of matrix mainly with the compressive strength and the porosity.
Lorenzen, Factors affecting the immobilization of metals in geopolymerized fly ash, Metal.
Qu, Study on the factors of affecting the immobilization of heavy metals in fly ash-based geopolymers, Mat.

These precipitates were mostly deformed along the deformation direction and affected the recrystallization as well as the mechanical properties of the material.
This segregation has a significant effect on the microstructure and consequently, on the mechanical properties of the steel.
Using plain compression tests, the effect of centreline precipitate deformation on the mechanical properties of a selected steel was assessed.
This elongation affected the restoration kinetics and mechanical properties of the material.
The results also confirmed the strong influence of re-heating temperature of precipitates size, distribution and morphology as well as the mechanical properties of steel.

Therefore, an alternative from natural source is needed to replace carbon black as the reinforcing agent in rubber industries without so much affecting the physical and mechanical properties of the final products.
Natural fibres are more preferable and have many advantages to be used as fillers in rubber compounding due to the tremendous properties over other material such as light weight, low cost, renewable, good mechanical properties, ease of chemical and mechanical modification, water resistance, better dimensional stability, ease availability, recyclability and environmental friendliness [2].
The mechanical properties of rubber composite such as tensile strength, elongation at break and hardness are important to be measured.
One of the factors that contribute to the fracture was the uneven fibre distribution in the rubber matrix as can be seen from the Fig. 3.
Okieimen, Effect of coconut fibre filler on the cure characteristics, physio-mechanical and swelling properties of natural rubber vulcanisates, International Jurnal of Physical Sciences (2007) 039-046