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The main negative factors leading to a decrease in the casting properties of the process, as well as the quality of the castings obtained, are indicated.
The mechanical properties of copper castings can be improved by heat treatment.
Summary Thus, chill casting of copper alloys is a complex technological process that depends on many factors that affect both the mechanical properties and the quality of the castings obtained.
Among the unfavorable factors inherent in the casting process of copper alloys: high melt temperature, as well as poor casting properties of copper.
Hekimoǧlu, Relationships between mechanical and tribological properties of Zn-15Al-based ternary and quaternary alloys, International Journal of Materials Research. 107(7) (2016) 646-652

The high piezoresistivity effect and sensitivity to stress are due to compositional and mechanical properties of polymer derived AlSiCN ceramics.
Introduction Polymer-derived silicon-carbon based ceramics with excellent high-temperature properties have a potential application of engineering materials in harsh environment[1-3].
Thus, we assume the electrical properties can also be understood through tunneling-percolation network model which have been suggested to properly describe transport properties of conductor-insulator systems in which tunneling coexist with percolation behaviors [6]. we reported for the first time [7] that polymer-derived SiCN ceramics also have very significant piezoresistive effect with gauge factors ranging from 1000-4000, which is much higher than that of any existing high-temperature materials.
Hence, to some extent,dopants modulate the electrical properties of Si-C-N ceramics[8].
Therefore, in this paper, we present our studies on the piezoresistive effect with Al doping to gain a basic understanding the electrical properties of polymer-derived ceramics.

Micro-mechanical properties increased with increasing value of the dose of irradiation material.
The factors affecting the changes of polyethylene by irradiation are the molecular weight distribution, branching, degree of unsaturation, and morphology [1-6].
The micro-mechanical properties of surface layer of HDPE modified by beta radiation improved significantly.
The highest values of micro-mechanical properties were reached at radiation dose of 99 kGy.
Improvement of mico-mechanical properties of radiated HDPE has a great significance also for industry.

Mechanical Properties and Texture Evolution of AZ31 Mg Alloy during Equal Channel Angular Pressing H.
Microstructure and texture evolution in the AZ31 Mg alloy subject to equal channel angular pressing (ECAP) have been investigated and correlated with the mechanical properties.
The Schmid factors on basal slip systems for 1 passed material are relatively small compared to those for more than 2 passed materials and all basal slip systems in 6 and 8 passed materials can be activated with high values of Schmid factors.
It is also possible to correlated the small changes of yields stress with variations of schmid factors after 2 and 6 passes.
Table 1 Textures and Schmid factors of the ECAPed AZ31 Mg alloys.

Further step, effect of pouring temperature on microstructures and tensile properties of castings was researched in the introduced process.
Microstructures and mechanical properties of rheo-diecasting samples are investigated.
It is mainly caused by two factors, one is heat loss of slurry during processing as mentioned above, the other is the sensitivity of solid fraction to temperature changes which becomes very high below 570 ºC[11,12] .
With the aim to analyze the factors affecting solid volume fraction, the number of primary particles per unit area is selected to represent the density of primary particles because of randomly observed area.
SEM images of reho-diecasted samples with pouring temperature of 575ºC 3.2.2 Tensile tests The mechanical properties of rheodiecasted samples with correspondingly pouring temperature are summarized in Table 2.

To study its mechanical properties, the commercial software ANSYS is adopted to establish the finite element models of PLSL.
To study the mechanical properties of PLSL, the commercial software ANSYS is adopted in this paper to establish the finite element models by nonlinear buckling analysis.
The special mechanical properties of wood mainly perform elasticity under lower load, plasticity under higher load, and creep and relaxation under special conditions which is similar to metal.
Structural Factors Some factors affecting the ultimate bearing load are considered, such as the diameter and spacing of prestressed steel wire, the magnitude of prestress and the width of the lumber.
The length of lumbers is 2400mm, only one factor is variable, other factors are same as the previous model.

The results showed that the larger induction reheating power of the billet, the smaller the grain size of its microstructure and the higher surface hardness and the better mechanical properties of its thixoforming sample.
To compare the microstructure and mechanical properties of the thixoforming samples under different heating power in a lateral direction, the parameters should be kept the same during the thixoforming.
Measurement of mechanical properties.
Mechanical properties.
Among the many factors affecting the intensity and plasticity of the material, the role the grain size played a very important role.

Timber is one of the most used materials for roofing of ice arena because of its very good mechanical properties and low weight.
Newly developed mathematical and physical model using CFD simulation is used for simulation of hygrothermal stress in chosen part of the ice arena roof construction, which substantially affects quality, utility properties and life time of timber roof components.
Not only the long-term action of liquid condensed water, but also the increased air humidity in the surrounding of cooled timber constructions are the cause of a decrease in biological resistance and a deterioration of the mechanical properties of wood mass.
To assess long-term risks of wood degradation and changes in mechanical properties due to an increased moisture, it was necessary to create a simplified 2D model for solving time-steady heat and humidity transfer in timber constructions taking the ice rink radiation into account.
In publication [4] it is stated that for wood with a moisture content between 8% and 20% an approximately linear dependence between moisture and mechanical properties can be considered.

X-shaped conjugated single-slope shear failure and single-slope shear failure under compression and shear tests ; (2) under uniaxial compression, the performance of intact specimen is clearly affected by its size, and the strength of jointed one is significantly affected by the weakening of the structure.
And the spatial distribution and properties of the structural surface (like geometry, density, filling materials, etc.) [1] play a controlling role in the deformation and failure of rock mass.
Test specimens preparation Similar material model test is widely used in the mechanical research of jointed rock [6~9] for the following reasons: (1) to make parametric analysis, that is, the engineering practice controlled by multiple factors can be tested under individual event, in order to analyze the influence of a certain factor; (2) to solve the problem of engineering mechanics which can not be solved by mathematical method at the present time;(3) to study mechanical phenomenon that may occur and to calculate deformation of the prototype from the model test.
The value of c will be affected also by the joints existence, e.g. c is 1.03, 0.51and 0.50 respectively for the 3 different kinds of specimens.
(4) The mechanical properties of material with preset filling joints are affected by the physical and chemical properties of filling material.

Various types of gates have differing properties and advantages, but based on the summary analysis of the state of the active gate, there are some common problems. 
For example, by using FRP materials, the weight of the gate could lose 40% of its weight and the durability can be doubled with the same mechanical properties.
This shows that elastic deformation will not affect the performances of FRP gates.
When the optimal factors come to limitation, it is time to consider appropriate increase in thickness.
The structure should be convenient to remove and install, meet the mechanical property requirements, and lower the cost.