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According to the analysis of rock strength and failure models in numerical simulation, it is acquired the influence of heterogeneity and element sizes on rock mechanics properties.
Therefore, the rock heterogeneity is an important factor considered in the research of the rock failure process.
(2) Where is the average stress, is the effective stress, is elastic modulus of no stir rocks, is damage parameter, is relative area of effective bearing internal force, thus, (3) The mechanical properties influence of rocks on element sizes Establish model Under the conditions of mechanical properties of elements and invariable boundary, we study the stability influence of the element sizes from non-uniform materials on macro-mechanical behavior, failure modes, and failure process[6].
Fig.1 gives us the model of mechanical properties of elements and invariable boundary.
Fig.2 shows that the fluctuation of macro-mechanical properties for samples becomes small with the element sizes decreasing.

The increase in the degree of development of civilization and technology has increased the properties and harmfulness of the wastes generated [1].
The curve of TG/DTA of raw clay Physical properties of fired clay bodies The shrinkage, density, apparent porosity and water absorption of the samples are key factors affecting the properties of the porous clay ceramics.
Mechanical strength Mechanical strength is a very important parameter to meet engineering requirements in cornstruction applications [8].
Judicious choice of the BW amount added and the firing temperature can result in different combinations of properties.
From the results obtained in this work, an amount of 20% BW and a firing temperature of 1125oC can be concluded to offer the best combination of properties.

Literature Review Aim to improve mechanical properties of FDM parts, several efforts have been made to study effects of various process parameters on it.
The bonding phenomenon is thermally controlled and ultimately determines the integrity and mechanical properties of the resulting prototypes.
Marloth “Effect of Layer Orientation on Mechanical Properties of Rapid Prototyped Samples” 2000, Materials and Manufacturing Processes
[2] Jaya Christiyana KG, Chandrasekharb U, Venkateswarluc K (2016) “A study on the influence of process parameters on the mechanical properties of 3D printed ABS composite”.
“Anisotropic material properties of fused deposition modelling ABS”.

The SIF provides information about the maximum stress at the tip of a crack, and it is affected by factors such as geometry, material properties, and load.
Press-fitting can introduce residual stresses, which can significantly affect the SIF and residual fatigue life of the axle.
Figure 6 shows the variation of stress intensity factors along the crack front, which are determined under stable and adverse running conditions.
These factors can lead to crack initiation and propagation in the axle, which can increase the SIF value.
An investigation on the influence of rotary bending and press-fitting on stress intensity factors and fatigue crack growth in railway axles.

Comparing and analyzing the corrosion law of tubing in distilled water and produced water, the results of column corrosion rate under hot steam injection and production conditions were obtained, which indicated the difference of corrosion and the influencing factors of tubing in two working conditions.
Therefore, the key point in studying tubing and casing corrosion is the effect of various factors on the corrosion reaction.
The corrosion properties of the mixed gas in the high temperature and high pressure environment may change during the process of injection and insulation especially for the thermal recovery well [4].
The composition and mechanical properties are shown in Table 1.
Hao, Factors affecting the corrosion behavior of tubular steel N80 in CO2 and H2S containing produced water of gas well, Materials Protec. 42 (2009) 59-62

Because of the high pressure and the contact area involved in the process, high friction stresses act on the tube walls restricting the material flow so reducing the amount of fed material, the part formability and affecting the soundness of the final part and its geometry.
Moreover, the whole tube material is deformed during the process, therefore the tube mechanical properties are improved due to the hardening phenomenon.
The material properties were tested in terms of different k and n values, respectively material strength and hardening coefficient according to the flow stress power law (s = k×en).
Figure 5 and Figure 6 report the results in terms of m values, main effect and interactions between the factors.
In the present paper, the method sensitivity on the material mechanical characteristics is evaluated using a simulation study.

Research Significant The importance of study the affect of adding different percentages of Polyethylene Terephthalate, which was obtained from wasted drinking water bottles, in improving some mechanical properties of concrete, such as rupture coefficient .
The properties of PET used is shown in table 5.
Properties and Design Characteristics of the Fiber Concrete.
The mechanical properties of PET fiber reinforced concrete from recycled bottle wastes.
[23] Topcu, I.B. and Canbaz, M., "Effect of different fibers on the mechanical properties of concrete containing fly ash", Construction and Building Materials, vol. 21, no. 7, pp. 1486–1491, 2007

The experimental tests Six T-shaped concrete-filled steel tubular stub columns, five with and one without steel bone, were designed to explore the main factors which affect the mechanical performance and the ultimate bearing capacity of the T-Shaped concrete-filled steel tubular tubular stub columns with steel bone.
The length of each component is 500mm.Cross sections of the components are shown in Figure 1.The compressive strength of concrete cube components is 46.29Mpa in standard test method and the mechanical properties of steel plate is shown in Table 2.
The Figure 4 give s the curves of load-strain under the influence of tube confining factor.
(2).This test verify the bone indicators and the tube confining factor are two major factors which influence the mechanical properties of this component.Increasing the bone indicators and the tube confining factor,can reduce the occuerence of local specimen,and the largest margin of increase is 71.7%
Study of the mechanical properties of axially loaded section steel and steel tube short columns filled with steel-reinforced concrete.

Therefore, oil casting should possess both excellent mechanical properties and good corrosion resistance.
Sn element is difficult to remove in steelmaking process, and will segregate at grain boundaries as residual element that is unfavorable to the mechanical properties [4, 5].
There is therefore a need to understand the influence of Sn on properties and corrosion behavior of the steel.
Table 2 Ion concentration of formation water extracted from oil field Ions Cl- HCO3- SO42- Ca2+ Mg2+ Na+ Content（mg/L） 15000 600 5450 880 1050 9560 Experimental Results Mechanical properties.
The size of the substructure of martensite directly influences the properties of martensite steel, and the sizes of packet and block are direct factors to decide the strength and toughness of the steel [8, 9].

The research results show that the performance of sports equipment based on carbon fiber reinforced epoxy composite materials has been greatly improved, with outstanding effects in terms of thermal properties, interface properties, mechanical properties, and fatigue resistance.
Interfacial modification can make composite materials have better mechanical properties, interface properties, and fatigue resistance than matrix modification.
Due to the limitation of the actual situation and objective factors, relevant data cannot be obtained.
Thus, there will be many interference factors.
This paper ignores many external factors, and the results obtained are slightly less convincing.