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Rubber sealing ring is one of the common seal components of military products, and its performance will directly affects the storage life of ammunition.
There are many factors influencing the sealing ring storage life, so it is not easy to give the exactly life for one specific model of sealing ring.
Introduction Rubber sealing ring is one of the common seal components of military products, and its performance will directly affect the storage life of ammunition.
During natural storage process, main factors which impact the performance is heat, oxygen, mechanical stress and oil medium, therefore, in a certain temperature range, aging test in oven is same with natural aging under warehouse storage condition in mechanism.
Combined with the storage conditions and methods for material evaluation, we get the dynamical equation between O-ring permanent deformation rate and ageing time by using the relationship between the material properties’ variation and ageing time as well as Arrhenius equation.

The predicted plastic deformation behavior of the workpiece material during ECMAP of route A, route B and route C with a theoretical total strain of ~2.2 upon a single pass at three different friction factors (m=0, 0.1 and 0.2) was compared.
Because the evolution of microstructures and the mechanical properties of the severely plastic deformed material are directly related to the history of plastic deformation, the understanding of the phenomena associated with stress, strain and strain rate developments is very important to the development of the ECAP process and to understanding the processed materials.
Table 1 includes mechanical and thermal properties of AZ-31 alloy from references [17-19].
Friction factors (m) between die (ram and channel inner) walls and workpiece walls were set to 0 (frictionless sliding), 0.1 and 0.2.
In the finite volume spaces, grid nodes were deformed in each space and the solver calculates effective strain, stress and the other properties by the relationships between the force and displacement of nodes of the finite volume space.

The results showed that properties of the samples passed the requirements of the industrial standard.
In addition, the utilization of dissolving agent affects both the microstructure and the properties of the samples.
Zhang, Investigation on the formation of tobermorite in calcium silicate board and its influence factors under autoclaved curing, Construction and Building Materials 143 (2017) 280-288
Quercia, Formation of tobermorite and xonotlite fiber matrices in well cementing and impact on mechanical properties, the 14th International Congress on the Chemistry of Cement, Beijing, China, 2015
Bye, Portland Cement: Composition, Production and Properties, Second ed., Thomas Telford, 1999

Many Factors influencing the testing accuracy are discussed according to the differences between the testing data of most of the domestic anti- force rolling brake testing platform.
We try to get the theoretical analysis and be proved by experiment through the mechanical model.
Finding the factors influencing the testing accuracy of anti-force rolling brake testing platform is significative to improve the authenticity and accuracy.
Conclusion In the view of the influence factors of the accuracy of measurement of anti- force rolling brake testing platform, mainly from the adhesion coefficient, the tire pressure, the displacement of the rear wheel, direction of deflection in four aspects，and expanding influence factors measurement under the condition of car braking force, by the braking curve, compare it with the braking curve under normal situation to prove the vehicle state changes affect the precision of anti- force rolling brake testing platform.
The Factors Influencing the Testing Accuracy of the Anti- force Rolling Brake Testing Platform: Agricultural Equipment & Vehicle Engineering,2007(4) , p.36-38.

Meanwhile, the mechanical properties of membranes were researched.
The blend membranes possess much better permeability than pure PVDF membrane and fairly good the mechanical properties especially for the membrane made by PVDF: PPTA=6: 1.
The mechanical properties of the blend membrane.
Blend membranes can have better mechanical properties by adding an appropriate amount of PPTA.
When the weight radio of PVDF and PPTA was less than 4:1, the mechanical properties began to decrease.

The electrical and mechanical properties of the PS/PSEG were measured.
The mechanical properties and electrochemical properties of the composites were investigated.
Results and discussion Mechanical properties.
Electrical properties.
(a) Impact strength (b) Tensile strength Fig.1 Mechanical properties of PS/ PSEG composite materials Fig. 2 Surface electrical resistance Rs of PS/ PSEG composite materials Distribution.

The structure, elcctrical conductivity and mechanical properties of the composite were studied in detail.
The SEM characterization indicates that CNTs were dispersed uniformly in the PPS matrix, which leads to a remarkable improvement in mechanical properties of composite.
Recently, polymer/Carbon nanotubes (CNTs) nanocomposites have gained intensive interest because of their unique and valuable properties, such as, in mechanical[9], thermal [10], and electronic [11] properties compared to the pristine polymers.
One of the advantages of CNTs as a reinforcement filler is their large surface area that can induce a better adhesion with the polymeric matrix, which is an important factor for an effective enhancement of the composite properties [12].
So the ball milling process is ideal technique for preparation of PPS composite with high elcctrical conductivity and mechanical properties.

It should be noted that on the lowest stiffness (0,5 kPa) the mechanical properties do not significantly affect the organoid size during the development.
Investigation in neural tube growth in 3D tailored synthetic matrix also has been conducted to see how the mechanical properties affect the artificial system[1].
In this system, the mechanical properties do not affect significantly the organoid size during the development.
It has been reported that mechanical properties affect multicellular tumor growth embedded in the matrix using agarose based[27].
For future works, it could be suggested to perform not only mechanical properties but also various cues that influence organoid growth such as soluble factors, extracellular matrix components, and degradability.

The joining of these dissimilar metals using any other conventional welding process is extremely challenging due to varying physical, chemical, thermal properties, the formation of the heat affected zone and lesser bond strength.
The domain of factors with their ranges are shown in Table 1.
Table 1 Experimental domain of input parameters Factors Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Amplitude (µm) 47 54 60 68 ... ...
The various properties of the base metals are portrayed in Table 2.
Effect of zinc coatings on joint properties and interfacial reactions in aluminum to steel ultrasonic spot welding.

Furthermore, the project addresses important factors affecting the quality and durability of the coating system.
An important factor in the evaluation was to determine the mechanical properties of the film [1,2,3].
The classification level of 0 was achieved in the test, which means that the coating system exhibits very good adhesion property.
The formation of corrosion in a material where a coating system has been applied is immediately influenced by several factors.
And that is why these factors require close attention.