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There are various treatments used to improve fatigue properties: thermal, chemical and mechanical methods, all have applications in this area.
Improved mechanical strength and fatigue properties are desirable in all engineering components, allowing lighter, more efficient operation in these circumstances.
This process alters the microstructure and properties of the peened layer, and therefore, fatigue damage needs to be assessed in terms of microstructural fracture mechanics [6].
The chemical composition and mechanical properties of the alloy are depicted in table 1.
Materials: Mechanical properties and chemical composition [13].

In addition, the nuclear reaction process between the incident particles and materials can produce transmutation atoms and spallation products such as helium atoms in materials, which can affect the microstructural evaluation and mechanical properties of the material [13].
In the irradiation and annealing specimens, these mechanical properties and microstructures including positron annihilation analysis and kMC simulation were examined to understand the effects of helium production and displacement damage on mechanical properties and microstructures.
Takada, Effect of gas atoms and displacement damage on mechanical properties and microstructures of F82H, J.
Aoto, Irradiation effect on mechanical properties in structural materials of fast breeder reactor plant, J.
Takada, Effect of gas atoms and displacement damage on mechanical properties and microstructures of F82H, J.

Cao electrospun PLA superfine fibers from solution and characterized the mechanical properties of the fibers [2].
The solution electrospun superfine fibers, which have holes in the surface, exhibit low mechanical property compare with melt electrospun fibers.
The low mechanical property limits their utility in some applications.
So many people study the melt electrospinning to get PLA fibers of high mechanical property.
Yang, Orthogonal design study on factors effecting on fibers diameter of melt electrospinning, J.

The natural aging behavior of the joint was systematically studied by local and global mechanical property testing method.
Based on TEM observation and EPMA analysis, the key factors that lead to different natural aging behavior among various regions of the joint were discussed.
Introduction The microstructure and properties of age-hardened Al-Zn-Mg aluminum alloy welds are in a metastable state after welding.
Therefore, in this work natural aging behavior of various regions (especially the weld zone) of the MIG-welded A7N01 aluminum alloy was systematically studied, with the aim of clarifying the key factors that affect the natural aging ability of the welds. 2.
The local tensile properties of the upper, middle and lower layer samples extracted along the welding direction from the weld zone were shown in Fig. 4.

In order to research the influence property of pre-tightening force, centrifugal force and dynamic cutting force on cutter components, and reveal safety recession of the cutter components, this paper makes load analysis for high speed milling cutter, studies cutter deformation, joint surface crushing, ductile fracture and other damage characteristics, gets the safety recession order of cutter components by safety margin theory.
(a) Load analysis of screw (b) Load analysis of blade (c) Load analysis of body Fig. 2 Loads analysis of milling cutter Safety Characteristics Analysis of High Speed Milling Cutter Analyze the deformation of components, crushing of combining surface, ductile fracture and other macroscopic properties.
Among them, tangential force affects obviously knifepoint, radial force is a small effect on stress and deformation, axial force is the main factors of blade positioning the stress and deformation.
Tangential component of cutting force has a significant effect on knifepoint, the radial component of cutting force has lesser effect on the stress and deformation of cutter, and the axial component of cutting force is the major factor of the stress and deformation of cutter body location surface.
Stroh: Journal of the Brazilian Society of Mechanical Sciences and Engineering Vol. 29 (2007), pp.313

However, there are few reports on the tribological properties of QBe2 so far, so it has great significance to study its tribological properties, wear resistant mechanism and the influencing factors.
The wear resistant property usually requires not only itself with good wear resistant but also its couple, and the two together constitute the mechanical system of the wear resistant property.
In addition, the actual using environments such as different surface roughness, loads and corrosion period under acidity will affect the tribological properties of the material.
The tribological properties are showed in Figs. 6 and 7.
The prior corrosion process reduces the tribological properties on the whole.

The preliminary results showed that coating steel with polypyrrole layer under different rotational speed can improve its corrosion resistance by a factor ranging from 1.2 to 1.88 depending on the operating conditions.
The advantages of aqueous electropolymerization are: (1) the aqueous solutions used are environmentally favorable, (2) the technique combines the formation of polymer and deposition of coating in one process and this process can be easily automated, (3) the production cost is relatively low and (4) the properties of the coatings can be controlled by varying the electrochemical parameters.
The above results can be attributed to the higher potential required for PPy layer formation at higher tartrate concentrations; this higher potential can affect the characteristics of the formed polypyrrole layer by over oxidation of the layer.
The above results can be attributed to that at higher solution pH lower corrosion of iron substrate takes place which reduce the amount of iron ions available for buffer layer formation and that can affect the homogeneity of the formed PPy layer and consequently affect its stability against corrosion while rotating in sodium chloride solution.
For examination under rotation conditions, the results show that coating steel with PPy layer can improve it corrosion resistance by a factor ranging from 1.2 to 1.88 compared to bare steel depending on the conditions at which the polymer layer was formed and the rotation speed.

Experiments showed that when the capacitor is exposed to a temperature excursion between -55°C to +125°C, its capacitance properties are maintained.
These factors, even if in HASS stage, may alter useful life while considerably reduce, in a causal approach, reliability in field.
Failure is generally originated from a combination of factors, mainly over operative conditions, that can hardly be connected to early detectable effects.
Those can helpfully foretell conditional factor affecting useful remaining life.
Zhou, «Similarity assessment of mechanical parts based on integrated product information model,» J. of Comp. and Inf.

Duo to quality defects of welds and some other factors，stress concentration is critical in the typical beam-column welded connection.[7] So the brittle failure of the welds at the beam-column connections can happen more easily, which lead to the damage of steel frame.
In the paper，finite element models are established by using numerical methods to study the mechanical behavior of these kinds of connections.
The impact produced by design parameters Lb on the mechanical properties of the nodes is not apparent.
So properly raising the widened flange arc length may play a role on the mechanical property in some extent.
Widened beam flange width bwf mainly affects the stress values of beam surface near the column flange.

Many problems must be considered, much workload has to be done, and different meshes can directly affect solution accuracy and solution scale.
There are many factors, which are unit type, mesh amount, mesh spacing and mesh equality, can affect the mesh generation.
Mesh amount is increased, solution accuracy will be improved, but solution scale also be enlarged, so how to choose mesh amount, must be took two factors into consideration.
Setting material properties is no essential difference between software, but operation has slightly difference.
[22] Xin Wang and Yunfei Mai: Mechanical Research and Application Vol. 9(2009), P. 43–46(In Chinese) [23] Z.