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Since missile airfoil structures in the same batch are based on the same drawings, the random dispersion of these structure parameters certainly exists due to machining deviation and other factors.
Reliability analysis and sensitivity analysis can quantitatively give the structural safety reliability, the most important factor affecting structural strength and structural life, and it can help to make instruct structural design [5].
Material properties are listed in Table 1.
Machining processing and dimension error are main uncertainty factors that affect airfoil structure strength.
(3) Sensitivity analysis of missile airfoil structure illustrates that the thickness of skin is the main factor affecting the strength of the airfoil structure.

Mechanical properties of adhesive were determined by tensile test and ANSYS analysis.
Mechanical properties for these materials are shown in Table 1.
Therefore, mechanical properties such as Poisson’s ratio and elastic modulus determined.
These mechanical properties are used in finite element analysis.
Thus, the plate 1 was applicable to determine the mechanical properties of adhesive.

The properties of welded joint will been improved by these fine crystal grain.
Those are not better for the properties of welded joint.
The molten pool will be affected when the arc rotates.
Conclusions (1) The optimal mechanical properties will be obtained when Im=2A, f=20Hz, which the ultimate tensile strength is 231Mpa and the micro-hardness is 76.2HV
The properties of welded joint will be improved by these fine crystal grain.

In order to refine the microstructure and improve the mechanical properties of the thicker steel plate, the large rolling reduction should be conducted.
Introduction Requirement of thicker steel plate with fine microstructure and excellent mechanical property are improved with rapid development of state economics [1].
The inner mechanical property of steel plate is not as well as in the top and bottom surface, the reason is that the inner region can not get enough deformation [2].
The deformation in the center was improved and then the strip mechanical property was improved.
Roller speed ratio (the divided value of bottom and top roller speed) that will not only affect effective strain along plate thickness but also affect plate shape after rolled is an important factor during constitution of snake rolling process.

The demand for titanium and its alloys, especially Ti6Al4V has gained a rapid pace in the recent decades because of its excellent mechanical and metallurgical properties.
Ramulu [12] presented that most significant parameter in drilling process affecting the cutting force is feed rate.
Titanium alloy Ti6Al4V is widely used and offer high strength, depth hardenability and elevated temperature properties up to 400 ̊C [6].
Chemical composition, mechanical and physical properties of test specimen is summarized in Table 1 – 3.
· According to experimental results from main effect plot as well as ANOVA, feed rate was the most significant factor affecting the thrust force

It is one of important factors to affect the stability of the sensing abilities of CFRC by now.
But the large amount of graphite powders added in cement-based material will result in a dramatic decline in mechanical properties, so small amount of carbon fibers is involved to ensure the mechanical properties of CFRC.
Therefore, mixing short carbon fiber and graphite powder into cement-matrix is a good way to increasing the instability of electrical properties of cement-based composites[7].
Because of environmental factors such as temperature, humidity and so on will badly affect the smart features of such materials, especially the electrical properties, so environmental effects on smart concrete is the basic problem of realizing its engineering application.
The electrical resistivity of conductive concrete depends on the electrical conductive properties, physical properties and interaction of conductive phase and cementitious materials.

Complex Equipment Failure Prediction Technology Based On Virtual Environment Jingde Huang Dalian Naval Academy, China jdh925@sina.com Keywords: Information Processing Technology; Failure Prediction; Virtual Environment; Complex Equipment; Failure Mode Abstract: Complex equipment used in the process, due to changes in running load, vibration, shock and other incidental factors and other confounding factors can lead to changes in equipment and technology status, fault diagnosis of the current state of change brought about by these technologies use is not enough information, relying solely on traditional sensor technology can not test some special devices for signal extraction and data acquisition features.
Introduction In the process of using complex equipment, due to load changes, the impact of friction and other incidental factors and other confounding factors can lead to changes in equipment and technology status, fault diagnosis of the current state of change brought about by these technologies use is not enough information, relying solely on traditional sensor technology can not test some special devices for signal extraction and data acquisition features.
Therefore, the establishment of more complex equipment operating conditions of dynamic simulation environment, combined with the physical prototype test results and raw statistical data, the actual use of complex equipment, process, considering the state of mechanical properties, condition monitoring parameters and empirical knowledge of the traditional expert integration and reasoning techniques to solve complex tasks needed to protect equipment maintenance problems.
Affect the fire performance of complex equipment failures divided into two types: the type of fault and under the type of failure.
Other factors identified in the case of moderate ring wear, leakage recoil mechanism, recoil machine leak and leaking projectile by the number of complex equipment for precise description of these factors will have a direct fault of the shooting of complex equipment performance (maximum After sitting long Xmax, the maximum recoil resistance Rmax, open the bolt recoil velocity VH) have a direct impact.

This process contributes to enrichment of matrix with fine TiNi3 precipitations, which significantly affect the strain-strength properties of the alloy.
This macrostructural feature of porous materials significantly affects their physical and mechanical properties.
Table 1 shows the physical and mechanical properties of SHS-produced and sintered materials obtained in bending test.
The structure of materials investigated is responsible for their mechanical properties.
Yasenchuk, Mechanical properties of porous NiTi aluminum-doped, Fund.

A test study of deformation resistance of S50C medium carbon steel in hot rolling process was conducted by using Gleeble 3500 Thermal-mechanical testing machine.
The research of deformation resistance show that not only the flow stress and plastic workability depend on chemical composition of material and microstructure, but also some external factors such as deformation temperature, strain rate, strain, stress state and environmental medium play a very important impact on the mechanical properties of material.
So, it can be used to provide theory basis for accurately calculate mechanical parameters of mill and formulate the rolling technology process.
The relation of strain rate and stress can be expressed by deformation rate affect index, witch value depends on deformation temperature.
(2)Through analysis the influencing factor for deformation resistance, established the plastic deformation resistance mathematic model of S50C medium carbon steel.

The different numerical models are constituted with the different material constitutive models in this paper, with the different section fiber division and other factors.
The results show that the different concrete constitutive model and the hardening of the steel constitutive model are the important factors of the accuracy of model, and the Gaussian integration points have 3~5 are bitterly for the simulate mode.
The Material Constitutive Model Material constitutive model is one of the main factors that affect the numerical calculation accuracy.
Mechanical properties of the materials Table. 2 materials yield strength (MPa) peak strength (MPa) elastic modulus (MPa) steel box girder 355 521 1.97×105 steel strand 1670 1860 1.95×105 common reinforced 335 518 2.04×105 concrete / / 3.58×104 The materials of concrete used C60.
Conclusions This study used the fiber model method with the OpenSees[1] for an externally prestressed composite beam to carry through the numerical simulation under static bending load, through control to the test results, this paper advanced several factors affect the accuracy of numerical simulation combined with the modeling analysis.