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It focuses on the use of relative method, via testing dynamic elastic modulus of concrete damage layer subjected to single face salt freezing cyclic, to draw a gradient damage curve of concrete, and then study the damage process of the concrete under the effect of salt solution and the freeze-thaw cycle synergetic factors.
Research programs Dynamic elastic modulus is an important parameter of the material properties, the theory basis of the test is determined by measuring the structure resonance frequency, according to a certain volume of strength and density, as well as the density related to the basic physical principle of resonant frequency based on the material strength theory of structural resonance frequency calculated by dynamic modulus of elasticity.
So this research mainly through the test the depth of damage layers of concrete was studied by the dynamic modulus of elasticity of the different factors under the synergy of damage evolution process, and measured their life in the laboratory.
Therefore, the hierarchical analysis on the corrosion of concrete under multi-factor still needs further research.
Relative method and its application in the mechanical properties evaluation of brittle materials [D].

In order to analyze the layered structure affect on seismic dynamic response of rock Slope.
Therefore, it provide the basis for dynamic reliability design in the process of slope treatment design to looking for the dynamic load response rule of different layered slope, including the correlation between slope inherent dynamic properties, dynamic loads and structural responses.
Physical and mechanical parameters of the slope are shown in Table 1.
Table 1 Physical and mechanical parameters of the slope Density(kg.m-3) Elastic modulus (Gpa) Poisson's ratio Cohesion between layers (kP) Friction coefficient between layers 2600 45 0.1 40000 0.7 Fig.1 The cross section of the homogeneous (a) , bedding (b) and anti-dip (c) slope The transient dynamic analysis technology was adopted for dynamic analysis of structure.
The following conclusions can be obtained from analyses: (1) Layered structure interface is one of the factors affect on slope seismic dynamic response, and it makes slope seismic dynamic response discontinuous or mutations

Ball milling time and concentration of short carbon fibers are the significant factors effect the dispersion of short carbon fibers among silicon carbide.
SiC whisker has good mechanical properties, heat resistance, corrosion resistance and high temperature oxidation resistance, it also has good compatibility with matrix material and it has become one of the major enhancements, toughening agent in composites.
According to fiber strengthen theory, carbon fiber can not play a function of reinforcing and toughening , it would affected the mechanical properties and toughness of the composites, the dispersion effects and the injury degree together determined the best ball milling time was 48h.
Determined the content of the content of SiC whisker is 5vol% based on the cost and the mechanical properties of composites.
Manufacture and Properties of Carbon Fiber-reinforced C/SiC Dual Matrix Composites[J].

The components of AASCM were optimized for favorable mechanical properties.
In addition, the tensile strength and wettability of FRP sheets are key factors that affect FRP sheets and AASCM work together.
The wettability and mechanical properties were taken into account in the determination of optimal mixtures of the constituents of AASCM, for the present results, the Ms of PS should be around 1.0, and the P/S and W/S should be around 12% and 42%, respectively. 2.
The strengthening effects of FRP sheets substantially depends upon the properties of the fibers.
Jiang, Alkali activated cementitious materials: mechanisms, microstructure and properties, Ph.D Thesis, The Pennsylvania State University, Ann Arbor, MI, USA, 1997

However, the majority of well-known HDAs possess much lower mechanical properties than well-known structural steels, and this is very serious obstacle for their application to the practice.
Materials and Experimental Methods The following factors were taken into consideration during the choice of damping component of the composite material: external static stresses practically do not affect the damping capacity of high-damping alloy with 60%Mn and 40%Cu alloy in the region of high and medium amplitudes of vibration, as it was shown in our previous research [2].
After explosion welding, the kinetics of changes in damping and mechanical properties of the bimetallic material during annealing at temperatures of 400-450oC was studied.
Adhesion properties of the compound were also monitored.
Summary High-strength bimetallic structural materials possessing high level of damping capacity and high mechanical properties can be produced using the explosion welding technology.

Student, Department of Mechanical Engineering, Khomeinishahr.
Changes in the composition of the apatite affect its lattice parameters, morphology, crystallinity (reflecting crystal size and/or perfection) and finally dissolution properties.
In regard to the above points, lattice parameters are expected to have better dissolution properties.
Estimation of HA nano crystallite size lattice parameters is one of the most important factors for dissolution properties of bone apatites.
The emphasis was placed on the relationship of the structure (or LCs) and atomic properties of these apatites.

Excellent combination of light weight and good mechanical properties put magnesium alloys ahead of other structural materials in applications where high specific properties are required.
In present study, the mechanical properties of magnesium alloys AZ91D and AZ31B under dynamic loadings have been evaluated using Hopkinosn bar.
Mechanical Properties of Magnesium Alloys Magnesium alloys have excellent strength to weight ratio, high specific stiffness, high impact resistance and good castibility [7].
The higher specific properties of magnesium alloys have gained a lot of attention in recent years and one of the prime factors that drive magnesium alloys utilization for vehicles related applications as well as an effective protective structural material.
Figure 2: Specific strength and specific energy as function of strain rate When metals are subjected to dynamic loadings, the rate dependence of their mechanical properties is vital for understanding their behaviour in such situations.

Several studies have reported that geopolymer binders show comparable or superior mechanical and durability properties than OPC system.
Mechanical properties of the final geopolymer brick product, are significantly influenced by variations in the type, composition and physical properties of the source material [32, 33, 34].
Unlike the workability of OPC mixtures which is affected predominantly by water to cement ratio, that of geopolymer mixtures is dependent on several physico – chemical factors such as concentration of alkali activator solution, alkali activator to binder ratio, mixing temperature, silicate modulus and solids ratio of the activator, physical properties of the raw material, etc. [22, 23, 36, 37].
Table 1 gives the values of impact factors determined for the various geopolymer materials.
Both of these factors increase the production cost

A Research On Static And Dynamic Fracture-Resistance Of Welding Parts Of Coolant Piping Material Haochuang Li, Kwang-Hyeon Lee, Jae-Mean Koo,Chang-Sung Seok Graduate School of Mechanical Engineering, Sungkyunkwan University, Korean, GM Korea, technical center, Korean School of Mechanical Engineering, Sungkyunkwan University, Korean School of Mechanical Engineering, Sungkyunkwan University, Korean lihaochuang123@126.com, psjjang@yahoo.co.kr, kjm9000@hanmail.net, seok@skku.edu Keywords: Fracture Toughness, Dynamic Loading, plastic η factor Abstract.
Tensile tests were performed according to ASTM E8 and ASTM E21 at a loading rate of 1mm/min to obtain the proper mechanical properties.
The mismatch factor MW is shown in Table 4。
Fig. 6 Relationship between plastic η factors and b / W for various strength mismatches As shown in Fig. 7, because the intersections of the lines fitting the analysis results according to variation of MW are located on the line of Eq. 3, the new plastic η factor equation was suggested.
[6] Y.Huh, H.I.Kim, K.H.LEE: Evaluation of the plastic η factor considering strength mismatch in a narrow gap welding part, Journal of Korean Society of Mechanical Engineers, Vol.32(2008), No. 6, pp. 512-518.

The formation of the weld line is influenced by a complex interplay of factors, including the rheological properties of the molten plastic, mold geometry, temperature distribution, and operational parameters like extrusion speed and cooling rate [3].
Table 1 The experimental factors.
Material properties of the parison model.
The changes in the mechanical properties and temperature of the parison can be mathematically analyzed during the process.
The parison model will be characterized by two main mechanical elements which consist of spring and damper properties which were explained by Hooke’s law.