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Sealing property of threaded connection in gas storage wells is of great importance to the safety operation condition of CNG filling station.
Threaded Connection Leakage Test Factors such as material, structure, pressure affect the strength property of threaded connection[2].
Fig. 1 Tested points distribution in thread leakage test Finite Element Mechanical Analysis for Threaded Connection The contact end face of external thread is subjected to F under preload force.
The elastic deformations of both threads are: (1) (2) where is the thread angle in axial section, °; is the thread taper angle, °; , are the elastic deformation factors of internal and external threads; , are the elastic modulus of internal and external thread materials; is the unit force on the thread, N.
Firstly, the tested pipes have good sealing property in threaded connection.

Resonant electromagnetic high-voltage transformers have an electrical QE factor of 20 to 30 whereas the equivalent for the piezoelectric transformer is its mechanical quality factor QM, which exceeds 2000.
Impedance Spectroscopy (IS) proves to be an efficient method capable to detect contribution of grains and the grain-boundaries resistance to the complex impedance of the PZT compound; it properly estimates its electrical conductivity as well as corresponding activation energies and concludes on structural properties [11-13].
Finally IS is shown to be an important method for detecting the proper amount of isovalent Ca-dopant in PBZT ceramics due to change in electrical properties.
Calcium dopants are located in the Pb vacancies, due to ionic radii similarity, and the resulting decrease in the amount of point defects affects the conductivity [14].
Results and discussion Mechanical quality testing.

Focus on the structure design of the wall, the main factors of influence rupture, mechanical characteristics of side wall and etc.
There is a wide shrinking of space in the design of the thickness of shaft wall due to these two factors
Vertical pressure is one of the important factors in the design of shaft lining structure, as there is a close correlation between its with vertical additional force, then its become a very important factors in the field of related research.
The affecting factors analysis on the shearing characteristic of the interface under high pressure [J].
Engineering properties of two grouting techniques in mending shaft-lining ruptures [J].

Due to tightening requirements for thermal protection of buildings, the development of new materials with good thermal insulation properties is supported.
Thermal conductivity of materials is not constant, is influenced by many factors.
For this reason we created by isolating a block from secondary raw materials [1], where the emphasis was placed on reducing the value of thermal conductivity coefficient while maintaining mechanical properties applicable for civil engineering.
The weight ratio and the mutual arrangement of layers of binder and filler affects the thermally technical and mechanical properties of composite.
Measurement of physical properties of samples by Isomet instrument was done by a straight probe with a range from 0.04 to 0.30 W / m.K.

An Investigation about Microstructures, Mechanical Properties and Corrosion Behaviour of the TIG – MIG Hybrid Welded Dissimilar UNS 2205 and is 2062 Steels N.
The welded joints are inspected through metallurgical, mechanical properties and corrosion behaviour.
Structure and properties of carbon steel to duplex stainless steel submerged arc welds. 
Effect of post-weld aging treatment on mechanical properties of Tungsten Inert Gas welded low thickness 7075 aluminium alloy joints. 
Muhibbullah, Mechanical Properties and Electrical Resistivity of the Friction Stir Spot-Welded Dissimiliar Al-Cu Joints, International Journal of Polymer Science, 2022, 208-222.

Serious accidents, like combustion and explosion of combustible and explosive fossil fuel chemical products, frequently happening in transportation and logistics fields become killers of human life and property safety and factors affecting social stability and development [1].Therefore, how to solve problems of storage, transportation and safety use of light oil fuels and chemicals is the urgent military and social needs.
Most of non-metallic explosion suppression materials are common polyurethane foam explosion suppression materials, which generate chips and impurities seriously affecting the quality of chemicals due to low glass transition temperature, poor hydrolytic stability and its relatively sever collapse situation[5] [6].
The material possesses quite high mechanical strength and toughness to guarantee collapse doesn’t happen during using process, so the service life exceeds the oil tank; it has good chemical inertness, heat and static conduction properties and anti-bacteria character[6]; in addition, compared with polyurethane foam and reticular metal materials, regular spherical figures are more suitable for various pipelines, oil tanks in abnormal shape and cleaning, which can conduct mechanical automation quick loading and unloading, so it boasts good application prospect.
Study on influence of separate and explosion-proof material on properties of oi lin storage process [J].
Study on influence of separate and explosion-proof material on properties of oilin storage process, 2014, 10(10):124-130

Effect of material properties on the plastic straining capacity of defective welds W.
The other important problem is that the interactions between the strain-based design specific variables affecting weld integrity are not fully understood [1,2].
This requirement involves knowledge of the interaction between the remotely applied strain, the mechanical properties of both weld and base metal (yield strength, Y/T ratio and uniform elongation) and defect size.
For non-elastic deformations the actual material properties must be used.
The crack tip driving force depends on many interrelated factors, which requires consideration in a strain-based design.

By using five different alkyl silane precursors, RSi(OR')3, to prepare the silica matrices, we have found that the R group influenced both the photochromic performance (e.g. response speed and optical absorption) and the fabric properties (e.g. durability to washing and abrasion, and fabric handle).
Also, epoxy groups have an additional crosslinking reaction, thus improving the mechanical properties of the crosslinked layer [9, 10].
Besides the mechanical properties and coating adhesion, durability to washing can be important for easy-care textile applications, and it is anticipated that this would be influenced by the pore size of the silica, the dye molecular dimensions, silica-dye interactions and the adhesive strength of the coating.
The washing durability was apparently affected by the mechanical strength of silica coating and its ability to retain the photochromic molecule.
The mechanical strength and delamination of photochromic silica layer could be the main factors affecting the washing fastness.

Heat treatment status also affects fracture toughness greatly, and fracture toughness in the T62 state is better than that in the T87 state.
Manganese alloy can greatly improve the heat resistance, while it can reduce the tendency of welding cracking; the addition of zirconium improves the heat resistance of 2219 aluminum alloy and grain refinement, can improve the welding properties of the alloy.
Compared to a large tank material in the past aerospace industry, 2219 aluminum alloy has the distinct advantage in the low temperature mechanical properties, fracture toughness, weldability and resistance to stress corrosion.
Effect of temperature on mechanical properties of 2219 aluminum alloy and welding joint of FSW.
Metallurgical factors affecting fracture toughness of aluminum alloys[J].

The analysis of two-dimensional rotation and impact properties of volleyball serving benefits detailed force analysis during the process of hitting and serving.
In this paper, a method combining modeling and actual impact properties analysis is proposed and utilized to analyze two-dimensional rotation curve of volleyball.
Fig.1 A schematic diagram of the ball hitting The main factors affect ball spinning concludes the following areas: (1) Flight speed of volleyball: for the hitting of volleyball, the greater the strength of striking the ball, the faster flight speed of volleyball, if the flight of volleyball is in the same arc, the ball flight for a short time, i.e., the speed is faster.
(3) Rotation properties of volleyball: the volleyballs in different rotating condition after interacting with the ground, the arc produced is different.
The analysis of two-dimensional rotation and impact properties of volleyball serving benefits detailed force analysis during the process of hitting and serving.