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Scheme of the nylon seal · Physical and mechanical properties of materials [7] are given in table 1: Table1.
Features of the Material PMMA is an amorphous polymer, the physical and mechanical properties of which depend on many parameters: temperature, strain rate, molar mass, characteristics of the external load, manufacturing method.
The temperature limits that characterize the mechanical properties of polymers are not material constants and depend on the rate or time of the strain.
After taking into account the non-linear properties of PMMA, the numerical calculation approached the experiment, the error of the FEM decreased on average to <5%.
The presence of the nylon seal between the aluminum hatch and the main acrylic sphere greatly affects the stress in the contact area.

It is characterized by various process parameters including material properties, extrusion ratio, friction, tool shape etc.
It is characterized by various process parameters including material properties, friction, extrusion ratio, die shape and so on.
As various process parameters in sheet metal extrusion affect the extrusion force, it is costly and time-consuming to study each parameter's influence by experiments.
Cold-rolled and 100% spheroidized carbide steel sheet C15E(EN) was used as the workpiece material, and a flow curve was determined by tensile testing experiments and its mechanical properties with Ludwik hardening material model.
Table 4 Analysis of forming force Factors Material type(A) εF (B) s(C) RP(D) Rd(E) µ (F) T1 114.8 107.2 147.8 157.1 152.3 152.5 T2 159.4 147.2 153.7 153.4 162.6 155.5 T3 191.2 211 163.8 154.8 150.5 157.2 R 76.4 103.8 16.0 3.7 12.1 4.7 Sum of squares 2945.8 5481.6 130.9 7 85.25 11.33 The range value (R) for each parameter is the difference between the maximal and minimal value of the three levels.

This paper focuses the technology and understanding of the grain properties and grain conditioning procedures.
On account of its structure and surface properties and also low heat conductance, grain offers the ideal conditions for cooling process.
A full understanding of technology of silo and handling plant design which takes account of the relevant physical properties of the grain storage under varying environmental conditions during storage is essential.
The most critical physiological factors in successful grain storage are the moisture content of the crop.
Another major factor influencing spoilage is temperature.

The objective of this study is to evaluate how the inclusions parameter, the inclusions size and their mechanical properties influence the maximum hydrostatic stress and damage value during multi-pass dry drawing.
The modified Bridgman correction factor was used in order to predict the large deformation behavior based on the result of tensile test.
In multi-pass dry wire drawing, the mechanical properties of final product are seriously affected by the wire temperature rise during deformation.
Table 4 shows the mechanical properties of the inclusion, Al2O3 [1].
Table 4 Mechanical propertis of Al2O3 Properties E [GPa] ν Value 398 0.23 Normalized Cockcroft and Latham’s criterion was used for estimation of the effect of inclusion on ductile fracture.

Furthermore, the properties analysis including boundary, conservation, and repeatability is given.
Therefore, in addition to the analysis of decomposition and composition algorithms and structural properties, the completeness of the composition and decomposition operation based on the analysis of concurrency and conflict should be studied furthermore. 1 Factors for completeness of the composition and decomposition 1.1 Basic factors In this section, three basic factors for Petri net decomposition and composition operations (i.e. concurrency, conflict and collision) are described briefly.
s1 s2 s3 s4 s5 s1 s2 s3 s4 s5 t1 t2 t1 t2 Fig.3 The Petri Nets with collision 1.2 Other factors for completeness of the composition and decomposition In Petri nets, the prior set place of transition can be seen as the condition of the occurrence of transition, the posterior set place of transition can be seen as the result of the transition.
[2] Wu Zhehui, The introduction of Petri net [M] Mechanical Industry Press 2006
The Reduction Operations and Their Properties for P/T Nets[J].

School of Mechanical Engineering, Harbin Institute of Technology Shenzhen Graduate School, 518000, China 2.
Introduction When developing new dental restorative materials, manufacturers must be able to predict the properties of new materials and their performance in the oral environment.
A number of uncertain factors are involved, each of which has the potential to introduce inaccuracies [2], for example, operator’s skill, prosthetic material, or cast shrinkage [22].
Accurate duplication of the movements of the teeth and condyles during function within a real oral environment are influenced by many soft tissue factors, such as the ligaments of the TMJ and masticatory muscles.
Pameijer, J., Periodontal and Occlusal Factors in Crown and Bridge Procedures, Chapter 7. 1985: Dental Center for Postgraduate Courses, Holland

Therefore, characteristics which will not affect the results of the analysis, such as filleted corners are often ignored. 
Fig.4 3D structural entity unit of SOLID185 3）Definition of material properties: the material of the base frame was pre-selected as 16Mn, basic parameters of 16Mn were shown in Table 1.
Tab. 1 Chemical composition and Mechanical properties of 16Mn steel The name of a shop Chemical composition % Mechanical properties 16Mn C Si Mn P S Yield strength MPa tensile strength MPa Stretch length % 0.12～0.2 0.2～0.55 1.2～1.6 ≤0.045 ≤0.045 ≥345 ≥510～660 ≥22 4）The free mesh generation with meshing accuracy of "4" was adopted, as shown in Diagram 4, a total of 10541 nodes and 35072 units were generated.
Usually, the safety factor of the base was taken as (n)=1.1, thus , therefore, in the operating process, the base frame can ensure the working resistance of the bearing roof, which meets the design requirements. 2 Conclusion Based on the above analysis on base frame, the following conclusions can be drawn.Stress concentration occurred mainly in the column nest and surrounding areas, where the stress often reached its maximum, therefore, the intensity of the column nest should be fully considered in the design.Through this analysis, we can know that the use of finite element analysis software ANSYS can well simulate the operating stress state of the equipment, and that by fully utilizing the analysis software, we can make an accurate assessment of the design scheme.
Conventional mechanical analysis of Key components of the auxiliary supporting equipment of the self-propelled road header based [J].

Glass ceramics are materials with special optical properties such as light reflecting and transmitting.
The outstanding properties of glass ceramic are the most interesting part to be explored.
Besides these factors, the glaze colour is also affected by size and quantity of crystals formed [13].
Demirkıran, The effects of mechanical activation on the sintering and microstructural properties of cordierite produced from natural zeolite, Powder Technol. 260 (2014) 7–14
Chen, Effect of ZrO(2) additions on the crystallization, mechanical and biological properties of MgO-CaO-SiO(2)-P(2)O(5)-CaF(2) bioactive glass-ceramics., Colloids Surf.

Concrete is vital in the construction industry, concrete innovation on the change of the traditional building materials and construction properties play an important role.
Lightweight concrete, foam concrete production is usually of foaming agent solution preparation in mechanical way into a bubble.
The material of low thermal conductivity, good thermal insulation anti-condensation properties, high compressive strength, strong bonding, adhesion, resistance to freezing and thawing, drying shrinkage and invasion of small water line linear variable rate, easy hollowing, cracking .
Shrinkage of cement stone structure causes the micro cracks, reduce the density of the structure of the cement, affect the structure of impermeability, frost resistance, corrosion resistance, etc.
Nature of the particle magnetization and the sequence of directional arrangement is the main factor to cement magnetic, at the same time, the varieties of cement and molding process, and the ratio of particle content is to determine the important factors of cement magnetic.

Introduction As the product of deriving of geological activity of the crust, rock mass widely exists in nature, it also be widely used as various construction foundation, surronding rock or building materials in the field of engineering construction, so its mechanical characteristics and performance is always the focus of research. rock or rock material are the rock sample which get shredded from natural rock mass, owing to Incomplete development and effect of crustal stress in process of diagenetic, there always form natural defects such as Subtle fractures, holes and plane of weakness in rock texture, so to affecting the physico-mechanical properties of rock.
Table 1 Different dimensions da-qing limestone rock sample mechanical parameters Rock number D[mm] L[mm] L/D [MPa] [10-3] E[GPa] T05 87.36 62.48 0.715 31.08 1.71 20.1 T12 90.11 86.86 0.964 28.06 5.63 5.1 T08 120.13 62.74 0.522 32.48 6.17 19.1 T09 120.15 62.85 0.523 29.28 3.17 9.7 T11 134.75 86 0.638 28.31 1.3 22.3 According to the test result, drawing a scatter diagram about relation between compressive strength and size, As shown in Figure 1.
China University of Mining and Technology associate professor Sheng-Qi Yang based on two equations, put forward a theory model of size effect of rock material [10]: (3) In the equation: is the mechanical parameters of any draw ratio under uniaxial compression, is the mechanical parameters of standard rock samples(this article takes the average values of all specimens), L/D is the draw ratio of rock sample, parameter a represents the sensitivity that rock mechanical parameters to size, parameter b represents correlation between rock material and size, parameter a and b are all material parameters, can be got by least-square method in regression analysis.
Due to the limited conditions, this test uses the specimen are all less than 1, so the end of rock specimen friction is the key factor that different size of rock owns different compression strength.
Standardized test for determining the physical properties of mine rock [M].U.S.