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Impact performances are studied when some factors such as feedback pressure, pipe length and flow rate are changed.
The effects that main parameters have on the impact property are studied, where some main parameters are changed.
The pressure in the nitrogen chamber will be affected by the stroke length of the return stroke, and different pressures in the nitrogen chamber are detected by PLC.
Research and analysis of the simulation results The effects of impact properties, which include changing the feedback pressure, the length of the oil pipe and the flow rate, are studied.
References [1] Xinlong Duan: Construction Mechanization ,3(2000),p59~61(In Chinese) [2] Guoping Yang: Construction Mechanization ,4(2001),p22~25(In Chinese) [3] Dinjun Zhang: Jiang Su Metallurgy, Vol.36(2008),p4~6(In Chinese) [4] Yongling Fu and Haitao Qi: LMS Imagine Lab AMESim(Advanced Modeling Environment for Simulation of engineering systems)(BEIHANG UNIVERSITY PRESS, China 2011)(In Chinese) [5] Guoping Yang and Yubao Chen: Mechanical Engineering Research, Vol.2(2012),p46~51(In English) [6] Xiaohua Ye,Xiaolong Miao and Yuwan Cen: Mechanical and Electrical Technology IV,Vols.229~231(2012),p1697~1701(In English)

Introduction The determination of mechanical properties of materials is important, both for the knowledge of their behavior and also for their sizing and using at maximum capacity.
The elastic properties of materials are characterized by three constants, namely: Young’s Modulus (E), shear modulus (G) and Poisson's ratio (n).
The developed techniques for determining these material properties are mainly classified into two types of methods: static and dynamic.
Resonance frequencies depend unique on the material properties of the object's, his geometry and boundary conditions.
Material properties of specimen are: Young’s modulus E = 210.000 MPa, Poisson’s ratio of 0.3 and a material density of 7850 kg/m3.

The efficiency of operation of deposits is determined by numerous factors, including the complex use of zeolite-containing rocks.
The study of the basic physical and mechanical properties of the initial components of the mixture of Portland cement with zeolite-containing rock, rheological and physical and mechanical characteristics of binders and mortars on its basis was carried out in accordance with the methods of existing standards.
Since the same degree of phase transformation leads to the same increase in porosity, it is obvious that other factors also have an impact on the strength reduction.
Methods of improving physical and mechanical properties of composite materials One way to improve the physical and mechanical properties of composite materials, including dry building mixes, is to fill the matrix of cement binder with highly dispersed mineral parts of zeolite-containing rock and fractional composition.
Graph of changes in the strength of solution samples in the age of 28 days with different ratios of silica component One way to improve the physical and mechanical properties of composite materials, including dry building mixes, is to fill the matrix of cement binder with highly dispersed mineral parts of zeolite-containing rock and fractional composition.

Therefore the independent intellectual property rights on the key parts’ assembly technology, the overall engine assembly technology and the bench test system design technology of the high-power low-speed marine diesel engine are formed to improve the technical level of the China's marine main engine industry.
Assembly of Intake and Exhaust System and Timing Adjustment of Valve The valve timing is one of the key factors that affect the intake process of the low-speed marine diesel engine, and directly affects the whole power, economy and emission performance.
That brings about the significant differences in the cylinders’ performance and affects the overall performance.
The disadvantage is that the actual working conditions have the cylinder pressure to affect the valve opening process, and the valve timing in turning the camshaft at a low-speed differs from the one in the actual working condition.
After analyzing the diesel engine vibration, the shock-absorbing structure is applied to avoid the test platform’s resonance caused by the mechanical vibration of the diesel engine.

The improvement of moisture damange resistance of asphalt concrete as a asphalt pavement surface is the way to enhance essential properties of the asphalt concrete mixture components between mix aggregate and a binder (asphalt cement) to withstand adverse effects from moisture.
This method allows for a fundamental mechanism of moisture damage to be analysed from an inside out perspective, free of external influencing factors.
Properties of the materials involved directly affect the adhesive ability of the aggregate and binder within the asphalt mix [3].
These properties include the surface free energy (SFE) and the aggregate mineralogy.
Two aggregates, namely Boral and BGC aggregates, sourced from different quarries around Perth in WA were used to replicate the physical aggregate properties used in asphalt pavement throughout the metropolitan region.

The effect of different factors on the polymer concrete composite and material selection are also described.
Chen and Yang [3] studied the influence of polymer latex on the fresh and the hardened properties of modified concrete.
Yang et al [12] also studied the effect of the fiber/matrix interface on the properties of cementitous composite.
From the experiments, repair of damaged walls using FRP sheets served to restore the mechanical properties of damaged reinforced concrete walls.
OHAMA, Handbook of polymer-modified concrete and mortars properties and process technology, Noyes Publications, 1995

Considering the excavation area, depth, the engineering piles length, pile diameter pile spacing factors, puts forward the experience calculation method, Honghuan Cui et al[4]. adopted Abaqus to simulate the mechanical behavior and deformation for retaining structure of foundation pit with excavating process.In order to reaveal the deformation and internal force of surport structure,spatial nonlinear finite element analysis is carried out in which the excavation process is considered.Ciritical parameters are discussed in detail.
All components are respectively assigned to properties, assembly, created the analysis step, defined the contactions and the boundary conditions, loading conditions, created mesh, then calculate and get results.
Therefore, quality level of the building model often can obviously affect the calculation time, calculation accuracy, calculation effect.
All parts are respectively assigned to properties, assembly, created the analysis step, defined the contactions,the boundary conditions, and loading conditions, create mesh, then calculate and get results
Therefore, quality level of the building model often can obviously affect the calculation time, calculation accuracy, calculation effect.

A successful model can predict the performance of a fuel cell at the given physical and operating parameters, loading of platinum catalyst on the membrane, GDL and material properties.
Hydration of membrane in the PEM fuel cell is to maintain the performance, if it is not maintained properly, flooding would occur which will affect the fuel cell performance [3, 4].
So identifying the proper channel and flow field design is a very important task while designing the fuel cell which also affects the performance of fuel cell significantly [5].
The model used to consider the system as three-dimensional and steady, the inlet gases as ideal gases, the system as an isothermal, the flow as laminar, the fluid as incompressible, the thermo physical properties as constant and the porous GDL, the two catalyst layers and the membrane as an isotropic.
Many other factors must also be considered into account in order to generate a computational mesh which provides representative results when simulated [7].

The principle of V-bending revolves around the mechanical interaction between the punch and die, determining the bend angle and radius based on the thickness and properties of sheet metal.
By considering factors such as material properties, the geometry of the part, and process conditions (such as applied forces and tooling configurations), analytical formulations aim to quantitatively estimate the amount of springback that occurs after the forming operation.
It incorporated various factors, including sheet thinning, neutral surface shift, combined hardening coefficient, blank holding force, friction, sheet thickness, and anisotropy.
By incorporating material properties, boundary conditions, and tooling geometries into the numerical model, FEA accurately calculates the elastic recovery of the material after forming.
Table 3 shows the mechanical properties of SUS 304 material [13] The parameters of the models are shown in Table 4 Fig.1 Parameters of the 2D Bending Model .

Peening a surface spreads it plastically in the manner of a rivet, causing changes in the mechanical properties of the surface.
Fig. 1, Stress-strain curve used for simulation Fig. 2, Numerical simulation model for shot peening Only the elastic properties of the harder component (Piece 2) will be considered (E = 200 x 103 N/mm2 and υ = 0.28).
Urriolagoitia-Sosa, "Analysis of prior strain history effect on mechanical properties and residual stresses in beams" Ph D Thesis, Oxford Brookes University (2005), pp 130-142
Carlson, "Weight function and stress intensity factor solutions" Pergamon Press, Oxford, England, (1991)
Dowling, "Mechanical behavior of materials", Englewood Cliffs, Nj, Prentice Hall, (1993)