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The effects of prestrain on the mechanical properties of steels are important for various steel structures that will have been exposed to plastic deformation.
Accordingly, a study was undertaken to determine the prestraining effects on the variations in fracture toughness (mechanical properties, Charpy V-notch impact properties and crack tip opening displacement) with structural steel Q235B and Q345 welded joints.
Results and Discussions Tensile Properties.
Impact Properties.
Fracture Mechanics Properties.

In addition, cutting process is independent of the mechanical properties of the ceramic material such as hardness and fracture toughness.
The factors affecting the laser cut edge quality were examined by King and Powell [5].
They indicated that the cut quality was affected through modulating the incident laser power at frequencies derived from the natural striation frequency.
They showed that the main parameters affecting the end product quality were the laser output power, the scanning speed of the laser beam, the work-piece thickness, and the assisting gas pressure.
Kanaoka: Transactions of the Japan Society of Mechanical Engineers, Part C, Vol. 57 (2001), p. 2441

Factors that influence this phenomenon are the viscosities of the dispersed and continuous phases, the droplet deformability, the droplet size and the inter-droplet forces, the interfacial tension and the mobility of the adsorbed film [16].
Moreover, emulsifying properties were ultrasonic time-dependent.
Foaming properties.
Foam formation is governed by three factors: transportation, penetration and reorganization of the molecules on the air/water interface.
Mechanical homogenization process tends to increase the foaming capacity.

Silicon Steel Sheet Vibration Model Based on the Magnetostrictive Properties Panting Dong1,a, Li Zhang2,b, Mengqi Liu, Tong Zhao, Liang Zou, Qingquan Li School of Electrical Engineering, Shandong University, Jinan 250061, China aemail: 648940281@qq.com, bemail: zhlieee@gmail.com Keywords: Magnetostrictive force, Elongation-based model, Energy conservation principle, Elastic thin plate theory Abstract: Magnetostriction of transformer core plays a dominated role in the vibration of transformer equipment.
The vibration of the high voltage transformer is very serious, it may not only affect the normal operations and service life of the equipment, but also result in serious impacts on living activities of the surrounding people [1].
Magnetostriction is a coupled magneto-mechanical phenomenon which appears in ferromagnetic materials where the magnetic and mechanical properties are tightly related [4].
The frequency of magnetostriction is twice the sinusoidal magnetic field, so the frequency property should also be considered.
But actual transformer cores are laminated structure, the dynamic properties should be different from single silicon sheet steel, to obtain the actual vibration properties of transformer,there are still a lot of work to do.

The chemical modifier was impregnated into cell lumen space by pulse-dipping machine to improve the dimension stability and mechanical property of timber.
If a chemical can be impregnated as a bonding agent, chemical factors such as dipole interactions, hydrogen *Corresponding author: Junwen Pu, E-mail： jwpu@bjfu.edu.cn, TEL： +86-13681243864 bonds, dispersion forces, ionic bonds, and covalent bonds can also play a major role in the dimensionally stability.
Three methods for wood modification are presented along with the effects of modification on adhesion properties of acid and alkaline catalyzed phenolic and isocyanate resins [6].
The preservative type, preservative retention, and interaction with the surface were reported as highly significant factors affecting the shear strength of glue bonds in solid wood samples [7].
The chemical modified wood with urea-formaldehyde prepolymer changed the structure of wood lignin, cellulose skeleton of combination of chemical bond, so that between the skeleton through the urea-formaldehyde prepolymer for the bridge and the cross-linked together, played a role in enhancing the mechanical properties of wood and increase the dimensionally stability.

The extension of heat affected zone is an important factor.
Another phenomenon which should be dealt with is the change of properties due to radiation.
Of course the real capabilities of the techniques and the application parameters have to be taken into account, and these are considered as objective factors.
Intensive steps should be taken to learn the actual mechanical properties, and the integrity has to be verified by suitably selected non-destructive testing procedures.
Nanstad: "Effects of Thermal Ageing and Neutron Irradiation on the Mechanical Properties of Three-Wire Stainless Steel Weld Overlay Cladding" (ORNL Report NUREG/CR-6363 and ORNL/TM-13047, 1997), p. 85

The cost of magnesium and its alloys is one of the factors that limits their use on a very large scale (the cost of Mg is 3.5-6 times higher than that of steel and 1.7-2.8 times higher compared to that of aluminum) [1-5].
Magnesium-deformable alloys are of particular interest due to the possibility of obtaining more homogeneous structures and better mechanical properties, compared to similar parts made of cast alloys.
Due to the specific physical properties of magnesium, its welding requires low and well controlled energy.
Due to its very low electro-negative potential, magnesium is susceptible to galvanic corrosion, thus affecting the performance of mechanical joints in conductive environments.
Ebert, Magnesium: properties-applications-potential, Mater.

Effect of content of synthetic aluminosilicates in medium-density polyethylene on the fire hazard characteristics and mechanical properties of compositions is investigated.
These fire retardants are entered both individually and in the form of synergistic mixtures, given their effect on the change in the complex of mechanical, dielectric and other properties.
In the article effect of finely dispersed inorganic fillers on the thermal and mechanical properties of polyethylene compositions was studied.
The fire hazard properties of the samples of compositions were studied by the method of fire tube according to DSTU EN ISO 4589-3:2018 [14], the oxygen index was determined according to DSTU-N B EN 1991-1-2:2010 [20], and the mechanical properties were studied according to DSTU EN ISO 527-2:2018 [19].
In terms of their physical and mechanical properties, the studied compositions are not inferior to the known ones.

As a kind of labor-intensive industry, the building industry is characteristic of fixed product, huge staff mobility and many participants, which in turn bring about many insecure factors, and greatly affect the development of construction enterprises and national economy.
The good safety management can not only bring social reputation and economic benefits to the enterprises, but also keep the companies from losing property.
With a long production cycle and a bulky size, the building product is usually constructed in outdoor or high place, which is often affected by physioclimate.
Construction machineries, like tic-tac frame and portal frame, with laggard safety devices can easily cause mechanical injuries and fall accidents, which should be restricted or eliminated.
Where the production activities are, there must have unsafe factors and endless demands of preventing the harm or protecting the workers.

Establishing travelers satisfaction evaluation indicators system of passenger station External factors affecting travelers satisfaction has a lot, Including natural attributes travelers, social attributes, travel expenses sources, distribution of passengers, their mental capacity and ability to pay.
There are a lot Internal factors affecting travelers satisfaction, the main factors are from the internal transport, It also play a very important role in transportation enterprises to ameliorate their own problems .
We must integrate into external and internal factors and analysis of these factors on passenger satisfaction evaluation system.
Due to passenger satisfaction evaluation with special properties of multiple indicators and multiple level, it needs to clear construction principles of the travelers satisfaction evaluation index system[3],then analyzes the characteristics of passenger satisfaction based on the factors affecting travelers satisfaction evaluation.
The factors setare divided into several groups, such that , when （）,we called the first stage of the factors set.