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Simulation results for the combinations of design factors, according to the orthogonal array [3] of Taguchi method, are generated, and the optimum levels of design factors based on the response curves are obtained.
Proper settings of 3D modeling, acoustic boundary conditions, material properties of absorptive materials and perforated plates are crucial to the accurate solution of acoustic analysis.
The design factors that may affect the muffler performance include the structural configuration and interior design.
Table 4 lists the possible design factors that may affect the transmission loss of the muffler.
Subsequently, S/N ratios and curves of the design factors can be derived.

Crack initiation, wear and failure are caused by mechanical fatigue as local stresses in the contact area are high.
Using three uni-dimensional sensors in the microscope allowed finding a strong correlation between the magnetic field and the stress intensity factors during crack growth.
It was found that the magnetic field intensity is affected by the magnetization direction as well as the magnetization location.
Tables 2(a) and 2(b) present their mechanical properties.
Mechanical properties of the specimens: (a) Silicon nitride ball, TSN-03.

The composition of the mixture is one of the elements affecting the water absorption capacity of concrete.
This additional factor makes that the properties of the concrete mix with RCA, including in particular the water absorption, may significantly differ from the properties of the material with exactly the same composition, but made entirely with natural aggregate.
But this is not the only factor affecting the value of water absorption obtained in the study.
Ribeiro, Modeling of mechanical properties and durability of recycled aggregate concretes, Constr.
Kaplan, Concrete at high temperatures: material properties and mathematical models, Longman, 1996

The result shows that adding Ce can significantly improve the corrosion resistance and damping capacity of AZ91 magnesium alloy; the grain refinement and secondary phase morphology modification can contribute to those properties improvement.
The dynamic modulus was expressed according to relation [6]: G*=Gexp(i)=G′+iG″ (1) The mechanical losses (tanφ)were given by the ratio G′/G″.
Compared with other tested alloys, AZ91+3%Ce alloy exhibits the best corrosion resistance property.
Fig.3 The damping of AZ91 alloys with different Ce addition The tested strain amplitude(3*10-5) is at a low strain amplitude range and the factors influencing the damping properties are mainly including the solid solution, the second phase, dislocation configurations and grain size[11-12].
Instrinsically, the factors influencing the damping are weak pinners density and the average length of dislocation segments[13-14].

.-% gives excellent magnetic properties.
The improvement of the magnetic properties stays in contrast with the lack of ductility of these alloys, making their thermo-mechanical processing difficult.
Introduction The improvement on the magnetic properties of iron by silicon addition up to 6.5 wt.-% have already been reported, nevertheless the mechanical processing high silicon steels becomes difficult because of different factors: hardening effects because silicon atoms act as substitutional solid solution on iron atoms.
For the samples of steel B deformed 35 and 75% of reduction and held at temperatures of 900 and 1000°C during 10 seconds a small fraction of static recrystallised grains were found, the nuclei were characterised as regions with high Image Quality factor (showing a sharper Kikuchi pattern).
Dieter: Mechanical Metallurgy (McGraw-Hill Book Company, London, 1988)

Within the scope of this paper, the influence of contact area and surface pressure on the frictional properties during forming is studied.
State of the Art Major factors affecting friction include the normal stress along the tool and workpiece interface, the lubrication condition, the relative velocity, the temperature, the roughness, and the mechanical properties of the material and/or the tool.
A detailed investigation of these factors is demanding since the tool and workpiece interface in metal forming is usually under high pressure.
The amount of lubricants which can be stored in a micro dimple depends on geometric properties (width, depth, shape) of the indentation.
Results and Discussion In order to investigate the effect of contact area on friction properties, an experimental matrix is defined.

There is no significant difference in the composition and properties of the opoka-like raw materials and tripolis.
Tests of the properties of the opoka-like rocks as a basis for the products of wall ceramics have shown that the best way for them is the compression molding method [5,6].
This fact worsens the physical and mechanical properties of products, even in the absence of obvious defects [10].
The main factors affecting the quality of compacts are the molding moisture (for each type of opoka is different) and the pressing pressure.
Bratskii, Material structure and ceramic properties of a clay opoks, Engineering Bulletin of don. 4 (2014) 47–59

Not possessing outstanding strength properties in a wide range of materials it has low density and thermal conductivity, good acoustic properties.
These factors eventually lead to additional costs for grinding organization and implementation compensation.
The switching from traditional cement to composite binders on its basis provides an opportunity to make the technology of obtaining porous material more stable, less dependent on various technological factors and external influences.
Nakano, Microstructural approach to properties of moist cellular concrete, Proceedings Autoclaved Aerated Concrete, Moisture and Properties.
Andrzej Cement-based composites: materials, mechanical properties and performance, CRC Press, 2005

To improve thermal shock resistance of MgO-C materials, the properties of MgO-C materials with different graphite size distributions are researched.
The graphite in the MgO-C materials is the important factor influencing the properties of materials.
Through adjusting the graphite content with different size, as shown in Fig.2, the properties of MgO-C materials with different graphite size distributions are researched.
Cylinder specimens of Ф100mm×700mm are prepared for thermal shock resistance testing. 1.3 Properties testing After heat-treatment, the properties of materials are characterized by measurement of modulus of rupture at room temperature and at 1400℃, elastic modulus, corrosion resistance, bulk density, thermal expansion coefficient and apparent porosity.
A B C Fig.3 (A)Bulk density , (B) Apparent porosity and (C) E of MgO-C materials with different graphite size 2.2 Mechanical properties Fig.3(C) is the elastic modulus of MgO-C materials with different graphite particle distributions.

Titanium alloys due to their low density and high mechanical properties are a group of materials that are being used willingly nowadays.
Fast cooling of the molten material allows obtaining a surface layer with mechanical, physical and chemical properties other than in the base material, often also guaranteeing the improvement of the mechanical properties of the sample.
Laser texturing allows to modify the properties of the surface layer without affecting the chemical composition of the substrate material.
Liu, Microstructural evolution and mechanical properties of Ti–Zr beta titanium alloy after laser surface remelting.
Liu, Multi-scale microstructural development and mechanical properties of a selectively laser melted beta titanium alloy, Addit.