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The material of impeller is Q235, its mechanical property parameters [9] were shown in Table 1.
The mechanical properties of impeller physical quantity unit value density kg/m3 7850 elastic modulus Pa 2.06×1011 Poisson ratio 0.28 fatigue limit MPa 180 yield limit MPa 235 Assume the structure of the impeller free vibrates and ignore the influence of damping when modally analyze.
Vibration Characteristics Analysis Impeller vibration can affect the flow field in two aspects, firstly, the structural vibration affects the fluid boundary, and secondly, the elastic wave or sound wave that is inspired by the structural vibration affects the flow field.
The sixth-order frequency margin is the least, so its amplitude amplification factor is the largest.
Xi, Chinese Journal of Mechanical Engineering.

Their physical properties (including volume, mass .etc), mechanical properties (such as rigidity, brittleness, tenacity, and elasticity), usage and functionalities that is highly objective.
They are properties belong to materials themselves and are relatively stable so we call them physical properties; and the aesthetic significance, associations and resonance that materials can bring to people are their immaterial properties which are studied by the way people understand materials.
Affected by the standards of aesthetics, psychological cognition, cultural and regional factors, these characters are in accordance with “immateriality”, so they are called the immaterial properties of materials. 4.The Analyses of Immaterial Characters of Materials 4.1 The Aesthetical Characters of Materials It is said in the famous Chinese book The Artificers’ Record that “the combination of proper time, right spirit, delicate craftsmanship and the beauty of materials is fabulous existence .”
Picture 2 （Medals made of Kunlun jades inlaid with gold, silver or copper in the 2008 Beijing Olympics.） 5.Conclusion Materials’ physical properties, mechanical properties, usage and functionalities .etc are properties that can be analyzed and studied with physical, mathematical or chemical measures, these measures are easy to handle but also are easy to fall into rigidity; but the aesthetical, perceptible and associational characters of materials are attributes endowed to them by human beings.
These attributes emphasize “spiritual” level and are relatively complicated because they are connected with psychological, cultural and regional factors in a wide range, so it is difficult to handle measured studies of them.

Modification is usually needed to improve the mechanical properties of Al-Si alloys [4-6].
(2) Different influntial factors play a leading under different cooling rate conditions.
Effect of trace La addition on the microstructures and mechanical properties of A356 (Al–7Si–0.35Mg) aluminum alloys.
Effect of Ce +Sr Compound Modification on Microstructure and Properties of Cast High Silicon Aluminium Alloy [J].
Effects of Al−Ti−B−RE grain refiner on microstructure and mechanical properties of Al−7.0Si−0.55Mg alloy[J].

Damage tolerance properties of 2198-T8 integral fuselage panel between double friction stir weld joints Yu E Ma1,a, BaoQi Liu 2,b and ZhenQiang Zhao3.c 1Box 118, School of Aeronautics, Northwestern Polytechnical University, 710072, P.R.China 2School of Aeronautics, Northwestern Polytechnical University, P.R.China 3School of Aeronautics, Northwestern Polytechnical University, P.R.China ama.yu.e@nwpu.edu.cn; bxplane@126.com; cmarryania@gmail.com Keywords: Friction stir weld; Fatigue crack growth; Crack growth rate; Kres Abstract.
Stress intensity factors for all specimens were calculated using the expressions recommended in ASTM E647.
For superposition approach, the total stress intensity factors from both applied load and residual stress can be superposed together: (1) The stress intensity factor range and effective stress ratio is calculated: (2) (3) So, the stress intensity factor range with the presence of residual stress is independent of the residual stress, however the stress ratio is significantly affected.
Fig.4 Residual stress profile in double weld specimen Kres Stress Intensity Factor from Residual Stress.
[3] Matt H., “An emerging joining technology lets manufacturers rethink how products fit together”, Mechanical engineering- CIME, March 2003

Moreover, such factors as world economy agglomeration, liberal requirements to commercial product and informational globalization facilitate the process.
Therefore, based on the key role of the consumer in market relations, the problem of an objective evaluation of the performance properties of the materials that come in direct contact with human body and that may affect feel-good factor, physiological condition and health of a person.
It was found that the dominant factor in the assessment of ergonomic properties of shoes is human mental comfort or discomfort, which is determined on the basis of respondent’s organoleptic perception.
Based on Rehbinder Theory the following assumptions were made for the type of secreted moisture binding with the material of inside space of a shoe when wearing (for example, everyday low shoes) in closed rooms: in comfortable conditions moisture remains in physic-chemical bond with inside materials (lining and insole) of shoes; in discomfort environment created by intense sweating (humidity increases up to 75 %), moisture forms physical-chemical bond with shoe materials with excessive moisture content, affecting hygienic properties of shoes and consumer’s sensations.
It is shown that, according to consumer’s subjective feelings (psychological comfort or discomfort in wearing shoes) conditioned by objective ambient factors such as environmental conditions (temperature, humidity, etc.), the hygienic properties of shoes and materials the shoes made of, play a special role.

A plastic brick clay with high clay mineral content was selected and the effects of different extruder heads on the main physical properties of the extruded products were investigated.
In addition to the physical properties of the products, the pressure caused by the extruder heads was determined by theoretical calculation and measurement.
The results obtained through an optimized inner geometry or rotation speed of the extruder screw have beneficial effects on product properties or reduce power consumption [1, 2, 3, 4].
Pressure depends not only on the geometry of the screw and the head, but the on rheological properties of the clays used [5, 6].
The physical properties of fired brick products changed to a measurable extent depending on the shape of the extruder heads and the rotation of the extruder screw.

In work [2] investigated the tribotechnical properties of manganese phosphate covers on the steel surface.
It has been shown that the best percentage of molten surface for reducing wear rate is 46%, while the track angle is not considered as a major factor affecting wear rate.
Work [7] is devoted to the study of the tribological properties of laser infused composite covers NiCrBSi / WC.
The experience of re-infusion the WC - Co covers with a laser and the results of tribological properties studying are presented in [8].
To obtain optimum mechanical properties of the deposited cover, knowledge of the temperature fields in the cover is required.

Matrices , , , and vectors , are constructed on the base of corresponding matrices and vectors of local factors , , , , , , finite element (FE) matrices and vectors , , , , , (computed using quadrature of optimum accuracy).
(4) Computational models constructed by authors adequately reflect the geometric-stiffening and inertial properties and load parameters of structures and foundation of a high-rise building.
Coefficients of soil reaction are defined on the base of static properties of soil foundation for permanent, temporary, snow and wind loads (Fig. 2).
Determination of the natural frequencies and mode shapes of mechanical systems are perhaps the most informative verification samples, integrating many factors and parameters of computational model and, at the same time, allowing to detect corresponding difference.
Hughes, The Finite Element Method: Linear Static and Dynamic Finite Element Analysis (Dover Civil and Mechanical Engineering), Dover Publications, 2000

Key idea of the technology is the adaption of the mechanical properties by a local heat treatment.
Thereby the mechanical properties of different material grades were analyzed in dependency of the heat treatment profile.
In case of tailored properties in the blank, one additional factor has to be taken into account.
This is the transition zone between two material properties that has to be defined by analytic description.
Moreover, the material characterization should be extended in order to achieve an even better modeling of properties in the heat affected zone exceeding the used linear interpolation.

These factors considerably limit the range of UF resin uses.
This is due to numerous advantages that isocyanate adhesives provide over other adhesives, for example: faster press times, no formaldehyde emission, higher moisture tolerance and superior mechanical properties at low resin loading.
These negative factors go against technology researching.
Effect of content of EP on the properties The effect of different content of EP in UF resin on the properties of plywood was shown in figure 3.
The better properties were obtained when the content of EP was 7.5%.