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These changes in mechanical properties with torsional cycling can be related to the generation of imperfections such as longitudinal cracks on the instruments.
Many factors have a significant influence on mechanical behavior and fracture resistance of endodontic instruments, such as: diameter, taper, design of cross-sectional, alloy composition, manufacturing methods, depth of the flute, beyond canal curvature and dentin hardness [7,8].
The influence of cyclic straining in torsion, on torsion properties and fatigue resistance was evaluated at G2 and G5, respectively.
So, both geometrical parameters are efficient to predict these mechanical properties, as observed in previous studies [12,16,21,22].
Despite of the good relation between D3 and A3 and the maximum torque until rupture, others factors can influence the torsional behavior of the instruments.

Introduction High strength aluminum alloys, such as 7075-T6 and 2024T3, are utilized extensively for aerospace vehicles due to their excellent mechanical properties [1].
Influence of DNS complexing agent on the properties of conversion coating.
Analysis results of table 2 are as follows: the main factors of affecting thickness are the fluoride content, followed by the amount of complexing agent DNS.
The main factors affecting the corrosion resistance is also the content of DNS, followed by voltage level.
Comprehensive analysis of the results of three properties, A1B3C1D2 is the best experiment project.

Hydrogen Evolution Behavior during Tensile Deformation in Austenitic Stainless Steels Exposed to High Compressed Hydrogen Atmospheres Keitaro Horikawa1, a , Hidetoshi Kobayashi1,b and Motohiro Kanno2,c 1 Department of Mechanical Science and Bioengineering, School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, 560-8531, Osaka, Japan 2 Department of Mechanical Science Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, 275-0016, Chiba, Japan a horikawa@me.es.osaka-u.ac.jp, b hkoba@me.es.osaka-u.ac.jp, ckanno.motohiro@it-chiba.ac.jp Keywords: Austenitic stainless steel, hydrogen, mass spectrometry, deformation, fracture, high-pressure, embrittlement Abstract.
However, it is reported that type 316 stainless steels hydrogen-charged both cathodically and thermally are susceptible to hydrogen embrittlement, and a number of researches have carried out on the effect of hydrogen on the mechanical properties of the stainless steels [1, 2].
Although most of these researches have revealed the factors affecting the hydrogen embrittlement from the viewpoint of microstructures, little is known the role of hydrogen behavior during deformation affecting the embrittlement in the stainless steels, in which the stability of austenitic phase is different.
In contrast, when the SUS310S specimens with and without hydrogen charging were tested by SSRT, no clear differences of tensile properties were observed.

However, these materials are susceptible to damage induced by mechanical, chemical, thermal, UV radiation, or a combination of these factors. [1] Cracks and damages in materials alter their mechanical, electrical and thermal properties and thus result in failure of structures. [2] Cracks and damages in materials even at a microscopic level alter their acoustical, electrical and thermal properties resulting in failure of structures.
To determine which microencapsulation technique should be adopted, the following factors must be considered: properties of the core material, capsule size, encapsulation efficiency, resistance of the capsules to compounding with the matrix, and interfacial interactions between the microcapsule and matrix.
Initially, the research in this regard was focused on recovery of mechanical properties.
Available approaches to self-healing may be applied to restoration of other properties aside from mechanical property, such as conductivity.
Factors such as healing speed, healing efficiency, repeatability in healing, healable crack scales and compatibility with matrix materials must be characterized and considered clearly.

Plastic moulded parts should have good mechanical properties and free from defects.
Table 1: Experimental Factor Level Parameter Pressure [MPa] Injection temp.
Other factor that affects the weld line strength includes the presence of fillers and reinforcement.In injection molding process the packing time follows the fill time.
Material properties of ABS that obtained high impact resistance and strength when injection moulding process at low temperature also affected the weld line tensile strength results but had much less effect as compare with parameters condition.
This approach is suggested to be able to be tailored to various products and materials for injection moulding for both the optimization of production and structural properties of injection moulded parts.

Sensors Distribution Strategies In Guided Wave Sparse Arrays Based On Defects Scattering Properties WU Bin, ZHANG Yechi, ZHENG Yang, HE Cunfu College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology, Beijing, 100124, China wb@bjut.edu.cn Keywords: Guided wave; SHM; Imaging; Array shape; Ellipse algorithm; Hyperbola algorithm Abstract.
However, some recent researches on scattering properties of guided wave in defects demonstrate that the scattered signal is un-uniform even for a circular hole.
Scattering properties of defects were studied and effects of sensors distribution strategies were presented in this paper.
The number of transducer in the array affects the imaging precision.
The angle between transducer and crack is a key factor on locating the crack.

Shrinkage is a natural property of concrete.
One of the factors that could significantly limit the durability of concrete structures, are the effects of atmospheric carbon dioxide (CO2).
Fig. 2 Documentation of concrete surface affected by action of chlorides.
After carbonation, sulfite corrosion that substantially alters the physical and mechanical properties of concrete takes place.
Synergistic effect of acid gases affect pH significantly.

Potassium feldspar, phosphogypsum and coke are used as raw materials to obtain soluble salts of calcined sample through mechanical grinding, roasting activation and leaching with acid.
A study has been conducted on the factors that affect the leaching ratio of K2O of calcined samples, such as the type and concentration of leaching medium, temperature, time, liquid-solid ratio.
In order to explore the relationship between potassium dissolution rate and dissolution conditions, the effect of the four factors is mainly studied, such as leaching medium type, temperature, time, liquid-solid ratio on dissolution rate of potassium of the roasting samples.
Table 1 Chemical composition of potassium feldspar Chemicals Al2O3 SiO2 TFe K2O Na2O CaO Content (%) 17.09 62.91 1.15 12.79 0.97 0.19 Table 2 Chemical composition of phosphogypsum Chemicals CaO SO3 SiO2 Al2O3 TFe K2O H2O Content(%) 30.99 40.37 7.42 0.47 0.36 0.11 19.77 Table 3 Physical properties and chemical composition of coke Content Ash （%） Volatile（%） Fixed carbon （%） Calorific value (Cal/g） Ash composition（%） SiO2 S Al2O3 CaO Mass ratio 15.94 6.99 76.27 6711.18 57.80 0.87 21.30 9.67 2.2 The experiment principle and methods Si-A1-O bond of potassium feldspar is extremely stable and reflects a higher melting point (about 1500 ℃) and the larger melting range [5-6].

From the results, tensile properties and hardness of TPVs are slightly affected by processing conditions.
Parameters of mixing and products’ properties will be studied.
Physical Properties Table 1 shows physical properties of TPVs.
However, we found that the mixing pattern has slight effects on mechanical properties of TPVs.
Soares, The Effect of Mercapto- and Thioacetate-Modified EPDM on The Curing Parameters and Mechanical Properties of Natural Rubber/EPDM blends, Eur.

The orthogonal experiments were designed for three levels and four influence factors.
The unique properties of nanocomposite, not shared by conventional materials, include mechanical strength, thermal stability, fire retardant, molecular barrier, and corrosion protection properties.
Factorial designs are very important when experiments involve two or more factors and it is desirable to study the main effects and the factor interactions.
As shown in Table 1, the dosage of chitosan, PAC, MMT and the pH were designed as influence factors.
Table 1 Influence factors and level of the orthogonal experiments Influence factors CTS (mg) PAC (mg) MMT (mg) pH Level 1 20 100 100 6.3 Level 2 10 75 50 5.3 Level 3 5 50 0 4 Table 2 Results of the orthogonal experiments Experiment serial No.