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This paper in full consideration of the rheological properties of MRF and the structure of the traditional pilot operated relief valve, based on analysis of the key technical problems existing in this type of valve when using MRF instead of mineral oil.
The key technical problems of the pilot operated relief valve for MRF system Due to the special physical and chemical properties of MRF, when we use MRF is as the working medium of hydraulic system, the magnetorheological components in hydraulic system will be designed to face the following key technical problems.
Noise of the hydraulic system is divided into mechanical noise and fluid noise.
Damping force of the MRF valve decide to set the pressure range of the pilot operated relief valve for MRF system, and it influence the properties of the pilot operated relief valve for MRF system and the working efficiency of hydraulic system.
Ji: Chinese journal of mechanical engineering Vol. 16 (2005), p. 1625

In the previous studies on the ERW pipe performance, Chapetti et al [2] analyzed the cause of defects which were formed on oil transmission pipe and evaluated the fatigue properties.
Chemical composition and mechanical properties are listed on the Table 1 and Table 2 respectively.
Table 1 Chemical composition Table 2 Mechanical properties Chemical Compositions [wt.%] t [mm] C Mn Si P S Nb, Cr, Cu, V, Ni Ceq T.S [MPa] Y.S [MPa] El. [%] vE-20°C [J] 11.6 0.038 1.31 0.23 0.006 0.001 ≤ 0.8 0.335 617 562 39 464 Fig. 1 shows the surface-cracked specimen used in this study.
As recommended in ASTM E740-88, Newman-Raju equation [6] was used to calculate the stress intensity factors of the specimens.
Stress intensity factors for the pipes were calculated with the Newman-Raju equation [7] obtained from the 3-dimensional finite element analysis.

The durability is the key about how to study the Green High Perforcemence Concrete (GHPC).Much work has been done by many scholars on the duravility of RAC.However, more study focus on the mechanical performance.
Feng et al. [13] summarized that a number of factors such as:the recycled aggregate concrete,the ratio of water and cement,the variety and dosage of gelled material, curing conditions and the load would have important influence on the carbonation.
The Sulfate Corrosion Resistance.Yan hongsheng [14] found that after the water cement ratio was reduced and the fly ash was mixed into the recycled concrete, the internal pore structure of the recycled concrete can be improved, the speed and the number of crystallization would be reduced greatly in the aggregate clearance, and the sulphate corrosion resistance is improved.An et al.[15]observed that Na2SO4 erosion has different influence on mechanical properties of recycled aggregate concrete for different substituting ratio of recycled aggregate.Their cleavage strength and relative dynamic modulus of elasticity increase gradually in the initial stage of immersion-dry cycles.the overall tendency of relative dynamic modulus of elasticity and cleavage strength were diminishing with increased immersion-dry cycle number in the later phase of immersion-dry cycles.
It is not enough that researchers usually only consider a kind of influencing factors and the mutual coupling should be considered after various factors affected.Numerous studies have gathered in the coarse aggregate concrete, the study of fine aggregate concrete should also be strengthened.On the durability of the recycled concrete, scholars should not only on the macro phenomenon, but more on the micro structure level of the mechanism.
References [1] L.Wenxia, Z.Xiong and L. xin, Mechanical Properties of Recycled Aggregate Concrete Study of The Impact Factors.concrete, Number 10 in 2009（Total No.240）,60-63(In Chinese) [2] Kou, S.C. and Poon,C.S, “Compressive strength, pore size distribution and chloride-ion penetration of recycled aggregate concrete incorporatin class-F fly ash”,Journal of Wuhan University of Technology -Mater.

On the other hand, the corrosion of the steel plates as a result of exposure to external factors may be considered a problem that affects the permanence of the structures.
Though, construction of these jackets is not developed to affect the general behavior but to change some mechanical properties of the concrete to strengthening and repair the occurred damages.
The Iraqi Standard specification No. 45/1984 [36] used to confirm the chemical and physical properties of materials.
Table 2: Properties of the analyzed columns.
Xie, Effect of SCM and nano-particles on static and dynamic mechanical properties of UHPC, Constr.

The main factors cause the situation above is the bonding temperature stride across the a→β transition temperature of 980℃[12].
These factors might lead to Ti diffused more fully than other elements.
But there was many dendrites in the base metal which might change base metal property.
Review: synthesis, properties and applications of titanium aluminides[J].
Microstructure and properties of transient liquid phase diffusion bonded joints of DD3 single crystal superalloy[J]．

In the actual logistics process,external vibration excitation is often caused package resonance and lead to final damage of the package, so understanding the package natural frequencies and mode shapes, which can avoid package resonance factors causing unnecessary losses.
X-PLY Super-intensity corrugated paperboard pads is a high-strength corrugated board structure, at the same quantitative, the strength, the stiffness and the bending strength higher 15%, the strength of flat pressure higher 92% than ordinary corrugated paperboard, with a light weight, large strength ratio and stiffness ratio, excellent compression performance, cushioning properties and vibration-proof performance.
Sek [6, 7] based on experimental data of static and quasi-dynamic compression test, established analysis model for cushioning properties of corrugated board and also studied the compressive performance, the vibration transmissibility of the corrugated paperboard by using theoretical and experimental method.
Li et al [12, 13, 14] based on the drop impact test, investigated dynamic cushioning properties of two kinds super-intensity corrugated board X-PLY (A) and X-PLY (B) and obtained the experience formula and its characteristic coefficient for dynamic buffering characteristic curve.
As corrugated core showed a corrugated shape, the size of the surface curvature will directly affect the cardboard cushioning performance.

Produce cross cracks mainly due to the following factors.
When the vehicle impact load is too large, corner cracking, thereby seriously affecting the ride quality and durability of the pavement.
The surface loose flaking generated mainly due to the following factors.
According to the different mechanical properties of steel fiber in concrete, the strengthening effect is also different.
Because China has not yet specifically formulated for the basic requirements of the basic characteristics of the fiber reinforced concrete rigid pavement fiber concrete pavement design theory and methods, thus affecting the application of fiber reinforced concrete in road works.

Compared to the traditional thermoset-based FMLs, thermoplastic-based FMLs show significant merits, like recyclability and improved mechanical properties with a lower density.
Table 1 reports the obtained mechanical properties.
Bienias, The comparison of effects of hygrothermal conditioning on mechanical properties of fibre metal laminates and fibre reinforced polymers, Compos.
Experimental and numerical investigations on the quasi-static structural properties of fibre metal laminates processed by thermoforming, Compos.
Preparation and properties of Fibre-Metal Laminates based on carbon fibre reinforced PMR polyimide.

The laboratory tests carried out on the material were conventional test methods including unconfined compressive strength, cleavage strength, resilient modulus and shrinkage properties tests.
All these factors would affect the result of mix gradation.
Recycle mixtures with aged asphalt material could be affected by temperature.
Experimental study of mechanical properties of cold in place recycled mixture.
Fatigue properties of cold—recycled asphalt mixture.

Introduction Cement hydration is a physical and chemical process that the cement components and water react with each other, it is very complicated process affected by water-cement ratio, cement chemical composition, fineness, temperature, humidity, additives and other factors.
The study of hydration of concrete not only has a high theoretical value, but also the hydration mechanism of hardening pastes directly affects the microstructure and the development of various mechanical properties of concrete, and further affects cracking resistance, durability of concrete.
Laboratory method requires good laboratory conditions, and the results vary widely because of many influencing factors.
However, the study work of cement hydration is very difficult due to the complex components of cement and so many influencing factors.
After the ANNs was trained in the 37 training cases, it was tested to see how well it would recognize various material properties.