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Introduction With the development of computational techniques and software, the mechanical analysis of large structures is expected to deal with numerical simulation.
At last, how the length of plastic zone and the size of element affect the computational result is discussed.
The model reflects the property of reinforced concrete structure under the periodic loads.
Considering influence of the ductility of component, the dimension of member and the earthquake wave, the length of the zone for plastic hinge should be adjusted properly according to different problems and factors.

Research Analysis and Experiment Study on Flow Field of Hydrodynamic Coupling Rui Zhang 1, a, Chengjian Sun2, b and Yue Wang1,c 1 Faculty of Mechanical Engineering, Shenyang Aerospace University, Liaoning, 110136, China 2 AVIC Shenyang Aircraft Corporation LTD, Liaoning, 110013, China azhangrui790801@yahoo.com.cn Keywords: Hydrodynamic coupling, Gas-fluid two-phase flow, PIV test, CFD simulation Abstract.
Chin Lee[7-9] did the three-dimensional numerical simulation on flow field of coupling and made predictions on its properties.
By comparing a and b in Figure 3, it is obvious that the pressure is affected by charging ratio considerablly: charging ration is high when the pressure is higher, and charging ratio is low when the pressure is lower.
These results may predict correctly the performance of hydrodynamic coupling and the factors influencing the performance.
In order to reveal the complex internal structure of flow field and reflect the flow mechanism and its properties completely，further research on three-dimensional PIV test should be conducted.

Making use of smaller specimens [2] and geometries easier to machine than the usual threaded end specimens for mechanical testing or Young´s modulus (E) determinations is therefore atractive.
The resulting heat affected surface layers were grounded off with F1000 followed by F1200 SiC paper.
Calculation of E used the following equations: a) for rectangular bars E = 0.9465(mf2f/b)(L 3/t3)T1 (1) b) for circular cross section rods E = 1.6067(L 3/D 4)(mf2f)T1' (2) m, L = mass and length of the bar or rod , mm b, t and D =cross section dimensions of the bar and rod respectively, mm ff = fundamental resonant frequency of bar or rod in flexure, Hz T1 and T1' = correction factors to account for finite thickness/diameter, Poisson's ratio (µ) etc
[5] Materials Properties Handbook -Titanium Alloys, ASM Intern., Materials Park (1994), p. 1011
[6] Properties of SiC / SIKA and ESK leaflets

Stress and Vibration Analysis of Motor Back Plate in HDD GeunSub Heo1, a, Oh-hyun Kang2, b, Cheol woo Park 3,c , Sang-Ryong Lee 4,d, Choon Young Lee 5,e 1,2,3,4,5School of Mechanical Engineering, Kyungpook National University, 1370 Sankyuk-Dong, Buk-Gu, Daegu, 702-701, South Korea a angriu@hotmail.com, b kang9822@gmail.com, cchwoopark@knu.ac.kr, d srlee@knu.ac.kr, e cylee@knu.ac.kr Keywords: Stress Analysis, Vibration Mode, Hard Disk Drive Abstract.
Steel plate properties Fig 3.
There is deformation on the outer curved surface, but the system is not affected (0.00088mm).
So, cost-effective design factors were chosen in order (Thickness of resource, Number of Beams, Width of Beams).
track-following micro actuator for hard disk drives using SOI wafer , Journal of Micromechanics and Microengineering Volume 11 no.1(2001) [3] Yang Jing, Jianbin Luo, Xiaoxing Yi, and Xin Gu : Design and evaluation of PZT thin-film micro-actuator for hard disk drives , Sensors and Actuators A: Physical Volume 116, Issue2, 15 October 2004, pp.329-335 [4] Stanley Kon, Kenn Oldham, Ryan Ruzick and Roberto Horowitz : Design and fabrication of a piezoelectric instrumented suspension for hard disk drives, Proc.of SPIE Vol. 6174 617430-10 [5] Dong-Woohn Kim, Jin-Koo Lee, No-Cheol Park, Young-Pil Park : Vibration Analysis of HDD Actuator with Equivalent Finite Element Model of VCM Coil, KSME International Journal, Vol.17 No.5, pp.679~690,2003 [6] Jae-Hyun Park, Jin-Gyoo Yoo, Yoon-Chul Rhim : The Numerical Simulation of the Airflow for Reducing Vibrations of an Actuator in HDDs, KSME 2003 autumn conference , pp.664-669 [7] DC Jile : The effect of compressive plastic deformation on the magnetic properties

Among the available Hopkinson bar experimental setups, the bend test method is most commonly used for the measurement of material dynamic fracture properties [2].
Dynamic fracture properties measurement of the low impedance materials has gained importance in the recent years.
During compression testing, Chen et al.[7] used both the hollow transmission bar (outside diameter = 19mm and an inside diameter of 16mm) and bars made from the high strength aluminum alloy, for measurement of dynamic fracture properties of the low mechanical impedance material.
The quasi-static mechanical properties of materials are given in Table 1 Table 1 Quasi static mechanical material properties.
Therefore we need to thoroughly understand the factors that affect the stress wave propagation in a modified Hopkinson bar loaded fracture test.

Examples are provided concerning the characterization of the reinforcement population, interfacial properties, in-situ transformation and damage evolution.
Firstly, the presence of reinforcing particles is directly implied on the local mechanical properties, with reflection on the overall properties of the composite.
Interfacial characterization The matrix/reinforcement interface plays a decisive role in determining several properties and behaviours of MMCs.
Furthermore, its replacement by other types of interface (gas/ceramic, ceramic/ceramic) often denotes the occurrence of material defects, arising from processing problems and resulting in degraded properties.
These gains reach a factor of ~9 when processing a 100 × 100 × 100 voxel dataset from an Al/SiCp FGMMC tomograph (each voxel being a 0.95 3 μm 3 cube), even if, as could be expected, a 64 × increase in the volume of the dataset causes the processing time to increase by a factor of ~73.

This problem is the same of a large class of non-structural components, such as mechanical and electrical hospital and laboratory equipment that can lose their functionality because of earthquake motions, and structural problem, such as isolated constructions made of superimposed rigid blocks in archaeological areas.
The method of quasi-conservative averaging to obtain the statistical properties and probability distributions for the time to overturning has been recently employed [3].
Under realistic conditions, the rocking response of a rigid block is affected by additional factors such as the vertical component of the ground acceleration and the additional energy loss due to plastic deformations at the pivot points.

The main factors influencing the interaction are: characteristics of the wheel and grinding modes [6, 7, 19-22], including deep grinding [23-27], tool adjustment [22, 23], lubricating and cooling process media (LCPM) and feed conditions [28-31], the size and shape of the billet [28-29], etc.
Mechanical and operational properties of abrasive materials and tools.
The greatest influence factor with respect to fatigue is the speed of grinding v.
Mechanical Engineering, Moscow, 2000
Bairamov, Factors affecting the surface roughness in the deep grinding of titanium alloys, Russian Engineering Research. 7 (2005) 549-553

Anisotropy of Bending Properties in Industrial Heat-treatable Extruded Aluminium Alloys K.
A few additional tests were executed to investigate the effects of the extrusion process on the bending properties.
Sample preparation for EBSD includes grinding, mechanical polishing and electro-polishing.
Results and Discussion Mechanical Testing.
Table 2 Tensile properties for the different alloys: yield stress, ultimate tensile stress, uniform tensile strain, fracture strain, area reduction at fracture and r-value.

Results show that the adaptation of prefabricated building mainly depends on factors such as labor shortage, labor cost, housing demand, building process efficiency, weather, as well as reduction of waste material and energy consumption.
Introduction The use of prefabricated building has changed over time as a result of economic shifts, population surge, wars, as well as other social and political factors [1].
Trim work, as well as electrical, mechanical, and plumbing fixtures, is also installed
Brandon, Construction 2020: A vision for Australia’s Property and Construction Industry, Cooperative Research Centre for Construction Innovation for Icon.
[41] Gul Polat, Factors Affecting the Use of Precast Concrete Systems in the United States.