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Newton et al. [1] and Melkote et al. [2] experimentally investigated the effect of several factors on burr formation in stacks of 2024 and 7075 aluminium alloy.
During drilling of bimetallic stacked materials, in addition to the surface burrs, the interlayer burrs will form in the gap between the layers because of the drill thrust force and different bending properties at each layer, as illustrated in Fig.1.
This experimental intent is to use the general factorial design for analyzing the process parameters how to affect the burr size.
Two replicates of a factorial design in these four factors were run, with all 96 runs taken in random order.
For the interlayer burr high, it can be attributed to the interlayer gap, the thrust force and the material properties.

It Shows that both samples of N and SPN have the Nitriding hardening effect only to a certain distance from the surface and does not affect the hardness of the core or center.
The rate of diffusion of an element is affected by two factors, temperature and activation energy of diffusion [11].
As already known, the density of defects or dislocations and grain size are two important factors that enhance the diffusion process of nitrogen [11, 15, 16].
[13] S Lu, “Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment,” Journal of Materials Science and technology, vol. 26, no. 3, 2010, pp. 256-263
[17] S Kikuchi, and J Komotori, “Effect of Fine Particle Peening Treatment prior to Nitriding on Fatigue Properties of AISI 4135 Steel,” Journal of Solid Mechanics and Materials Engineering, vol. 2, no. 11, 2008, pp. 1444-1450.

Introduction The riveting joint is the main connection to fasten two thin-walled sheet-metal parts in aircraft assembly, which affect aircraft’s safety and fatigue life.
The materials properties and geometrical parameters of the riveting joint structure are as shown in Table 2 and Fig 3(a).
Table 2 Material properties of the riveting joint structure Material brand Elastic modulus (GPa) Poisson's ratio v Yield strength (MPa) density （kg/m3） 2A12-T4 2024-T3 73 73 0.33 0.33 368 345 2790 2790 (a) (b) Fig 3 Instance of finite element analysis Fig 4 Riveting force in the process The finite element model of instance is as shown in Fig 3(a).
FEA modeling of setting and mechanical testing of aluminum blind rivets.
Mechanical Science and Technology for Aerospace Engineering, 2009(4): p.514-516, In Chinese

Research on flexible bonnet polishing process method and related technology Shujing Sha1,2,a, Longshan Wang1,b, Yongjie,Shi1,c 1College of Mechanical Science and Engineering, Jilin University, Changchun, 130025, China 2School of Mechatronic Engineering, Changchun University of Technology, Changchun, 130022, China assj-07@163.com, blswang@jlu.edu.cn, cjiesy2007@gmail.com Keywords: Bonnet tool polishing, Precision machining, Core technology.
Among them, reinforcement layer choose fiber cloth of high tensile strength and thin thickness, polishing film used 0.8mm thick polyurethane pad, rubber balloon thickness of 1mm or 2mm, taking into account the mechanical properties and the bonnet inflation pressure are closely related.
Material removal is the essence of the mechanical processing and also the key factor that affects process efficiency and error convergence.
Harbin Institute of Technology have studied on the bonnet polishing properties through a lot of experiments and obtained some achievements.
[5] Ji Shiming, Zhang Li, Jin Mingsheng, Li Yanbiao and Wan Yuehua: Journal of Mechanical & Electrical Engineering Vol.27(2010) [6] Ji Shiming, Jin Mingsheng, Zhang Xian, Zhang Li, Zhang Yindong and Yuan Julong:Journal of Mechanical Engineering.

Considering the sampling depth, the dry drilling process lack any form of auxiliary radiating, combines with high vacuum lunar surface, poor thermal properties of lunar soil and high solar radiation, all these environments make the drill bit may reach very high temperature [2-4].
The drift of FBG wavelength caused by temperature change can be denoted as , (6) FBG sensor has high precision, and its sensing results are rarely affected by the source energy or the optical path, adapting to the humid climate.
And it also has capability of anti-electromagnetic interference, small size, easy to paste, and hardly impact on mechanical properties.
Conclusions The temperature and its influencing factors in drilling rigid regolith process is a great concern of space engineering, especially in vacuum environment.
The experimental results show that the vacuum environment must be considered as one of the important factors during the study on the drill bit thermal characteristic.

That is why the development of new algorithms for calculating the stress-strain state and durability of the structure, which are under the influence of the general action of several factors, is an urgent problem.
Available data about the study of changes of strength and deformation properties of welded joints, including conditions of varying degrees of exposure of aggressive mediums, as well as existing and proposed methods of calculating welded joints based on mathematical models to a large extent allow predicting the work of welded joints.
However, existing developments still do not have a general approach and do not reflect the real picture of the work of welded joints, taking into account the factor of reducing the working section of welds as a result of corrosion processes.
The Frequency Equation To study the changes of the strength of welds in time that have undergone corrosion, a plan and experimental studies have been developed: - the properties of the strength of the welds were determined, which were both at the usual conditions and the influence of various aggressive medium with a certain time interval; - the ratio of the strength reserves of the welded elements and the welds under the influence of various aggressive medium is obtained.
The method of determining the percentage reduction of the area of the working section of the test samples was taken as a basis for the study of the state of cross sections obtained as a result of mechanical cutting and measurements thickness of the layers obtained during the impact of various aggressive medium.

Role of various factors that affect the nucleation and growth of nanoparticles is discussed at length.
Morphology and size control of nanomaterials are key factors to improve their properties.
Extensive research has been performed to identify and control the factors that affect such equilibrium.
The factors controlling the morphologies of grown nano-particles have also been probed.
The basic operation and factors affecting the performance of QDSCs are reviewed by Tian and Gao [250].

The perfection of the ceiling-making process is very subjective to the adhesive and density levels of physical and mechanical properties.
Most importantly, microstructures affect the physical properties and behaviour of a material, and we can tailor the microstructure of a material to give it specific properties (this is the subject of the next course).
The minimal fire resistivity of the epoxy polymer signifies a limitation in major structural implementations because it affects the mechanical properties of the composite.
The inclusion of fire retardants, however, would retain their thermal and mechanical properties [34, 37].
The Mechanical Properties of Ceiling Board Produced from Waste Paper.

High speed mixer,GRH-10, Light mechanical and electrical equipment factory in Fuxin City,Liaoning Province.Parallel twin-screw extruder,ZSK-25WLE,WP Company in Germany.Injection molding machine,HTF120X2,Ningbo Haitian Plastics Machinery Group Co.
Fig 11 The relation between thermal conductivity and the test temperature and humidity Figure 11 shows that the thermal conductivity of composites is mainly affected by the test temperature and the air humidity.In the lower temperature (lower than the Debye temperature),the thermal conductivity increased with the temperature and humidity increasing.
The thermal conductivity of composites decreases with the injection speed increasing.The orientation of polymers affect thermal conductivity.The trend of density and electrical conductivity of some points of samples is similar,which is related to the crystallization and carbon content.
Test temperature and humidity affect the thermal conductivity.In a lower temperature,the higher temperature,the greater humidity and the higher thermal conductivity.
Properties of Iron Powder Filled High Density Polyethylene [J].

The working condition of jib can be simulated, and the main factors can be retrospect.
The working performance of jib will directly be affected by its performance.
But now for the solid-web telescopic jib weld strength, especially for the study of weld defects still have many shortcomings , in order to predict failure critical value under typical working condition, retrospect the main factors, ensure normal production, avoid the occurrence of major accidents, reduce the economic loss, decide to analyze the weld strength of solid-web type telescopic jib is decided to be analyzed by this paper.
The working condition of Jib also can be simulated, and the main factors can be retrospect.
Mechanical equipment and metal structure Design. (2th ed) [M].Beijing: China Machine Press, 2009