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The mechanical properties and phase transformation behaviors of fine grained specimens were compared to those of commercially available SUS304 (d =16 µm).
Such a grain size dependence of texture affects an extra ductility of SUS304 at the latter stage of deformation.
The mechanical properties and phase transformation behaviors of fine-grained SUS304 specimens were compared to those of large-grained one by EBSD (Electron Back Scatter Diffraction) analysis.
In short, we intended to clarify the material factors affected by grain size from microscopic point of view.
We think the following two factors owe this phenomenon

Zhang b* School of Aerospace, Mechanical and Mechatronic Engineering The University of Sydney, NSW 2006, Australia a l.chang@usyd.edu.au, bl.zhang@usyd.edu.au Keywords: Nanoindentation, mono-crystalline silicon, mechanical properties, phase transition Abstract: This paper investigates the "pop-in" behavior of monocrystalline silicon under nanoindentation with a Berkovich indenter.
It was found that with the experimentally determined area function of the indenter tip, the mechanical properties of silicon can be accurately calculated from the load-displacement data, that a pop-in event represents the onset of phase transition, and that a lower loading rate favours a sudden volume change but a rapid loading process tends to generate a gradual slope change of the load-displacement curve. 1.
There are two factors that may account for such variation.
With the experimentally determined area function of the indenter tip, the mechanical properties of silicon can be accurately calculated from the load-displacement data.
Munroe: Mechanical deformation in silicon by micro-indentation, J.

Measuring the Mechanical Properties of Ground Ophthalmic Polymer Surfaces Using Nanoindentation Dennis V.
An intercept factor ε=0.75 is used for Berkovich indents.
Results and Discussion Quasi-static Properties.
Creep Properties.
MHI offers good compromise of properties.

Many perplexing factors affecting the grinding performance, various grinding effects produced under different conditions and different grinding parameters [2].
The major factors affect the removal rate and surface quality in belt grinding process: the granularity of abrasive belt, belt speed, abrasive type, workpiece speed, grinding depth, contact wheel hardness and surface shape and material [3].
Table 1 is the 3 levels and 3 factors orthogonal table.
Table 1 Factors and levels of orthogonal experimental design levels Factors A. belt speed (m/s) B. grinding depth (mm) C. belt granularity （#） 1 31 0.4 60 2 34 0.6 80 3 37 0.8 120 Using orthogonal table to do grinding test, test arrangement and results are shown in table 2.
Reference [1] Huang Hai-bo, Li Fan．Discovery the microstructure mechanism of mechanical properties in high, middle and low carbon steel[J]．Physical Testing and Chemical Analysis Part A: Physical Testing, 2006, 42(1): 15-18

The limited mechanical and biological properties of Ca-P bioceramics should be considered, since Ca-P bioceramics often results in extreme grain coarsening or surface contamination when holding at high temperature, which could degrade the desired mechanical and biological properties [1].
The short sintering duration for the microwave plasma sintering process would be advantageous in suppressing exaggerated grain growth, and thus the Ca-P bioceramics might have better mechanical and biological properties.
The phase composition of plasma-sintered samples is significantly affected by sintering temperature from 1050°C to 1150°C (Fig. 2a and b).
The short time holding at high temperature is one of the main factors for the retention of fine grain size in the final sintered material.
A rapid heating rate is also a critical factor to suppress the surface diffusion that would often cause significant grain growth in convention sintering [8].

The experimental part also consist test the mechanical properties of a suggestion composite material.
Table 1: The mechanical properties of standard polypropylene [9].
Result and Discussion 1-Tensile Test Result: The mechanical properties as (σy, σult and E) of each tested material represent the average value for three attempts.
The mechanical properties are listed in Table.2.
Table 2: The mechanical properties of suggestion composite material.

The results show that the friction dynamics research on the involute helical gear meshing can be resolved by Virtual Prototyping Technology, which can provide a new method to study the tribological properties of the gear meshing.
The mechanical properties and performance of the helical gear transmission directly affect the whole mechanical system [1].
Studying the dynamics and tribological properties of the helical gear pairs during the gear meshing process is positive to improve the performance of the whole mechanical system.
After that, the physical properties are defined, the contact, rotation, rotation driving and torque load are added.
In this paper, the contact ratio of the virtual prototyping model is greater than 3, there are always three pairs or four pairs of teeth in the meshing process, and the meshing position is changing over time, these factors lead to some fluctuations of the friction force on the tooth surface, as shown in Fig.8.

The Effect of DC Bias Voltage on the Structural and Optical Properties of Hydrogenated Nanocrystalline Si Thin Films Jae-Hyun Shim 1, Nam-Hee Cho1,a 1 Department of Materials Science and Engineering, Inha University, Inchon 402-751, South Korea a Corresponding author: nhcho@inha.ac.kr Keywords: nc-Si, DC Bias, PECVD, PL Abstract.
The mechanical properties of the films with sub-micrometer thickness was characterized by nano indenter (MTS, Nano indenter XP).
It is likely that there are factors affecting the stretching vibration of Si-Si bondings, and thus giving rise to the observed shift in ωTO of the Raman spectra.
The force constant of the bondings as well as the position of the Raman peaks are supposed to be critically affected by the mechanical strain in the films.
In particular, it seems that the evolution of the mechanical strain and the shift in ωTO is partly due to the formation of Si nanocrystallites in the films.

The results show that compaction pressure is an important factor on green density.
The appearance of axial tensile stress is the important factor which causes delamination and cracks.
The maximum relative density increases, the minimum relative density decreases and the increasing amplitude is much larger than the decreasing amplitude while the average relative density drops，in other words, the mechanical properties of the green compact is deteriorated.
When the friction coefficient is larger than 0.1, the friction coefficient begin to work and affect the compact densification.
The density drop (0.033) of compact 1 is smaller than the drop compact 2, and the mechanical properties of compact 1 is much better too.

Mechanical testing To obtain properties of the material, the samples were uniaxial tensile strength tested along the tube axis direction.
The properties obtained experimentally showed good concordance with the deformations of the wall thickness obtained by numerical simulation of the hydroforming process.
Fig.3 Tensile test specimens according to SR EN 10002-1:1995 Tensile test specimens were cut from the tube diameter Ø 35 mm in the longitudinal direction without affecting the characteristics of the material.
Stress-strain curves for cooper material and tensile strength testing results Uniaxial tensile strength testing consists in applying a tensile force on a specimen until fracture, in order to determine the mechanical properties characteristics.
Benyounis, Integration of finite element analysis and design of experiments to analyse the geometrical factors in bi-layered tube hydroforming, Materials and Design10 July 2010 [9] Mehdi Imaninejad, Ghatu Subhash
, Adam Loukus, Influence of end-conditions during tube hydroforming of aluminum extrusions, International Journal of Mechanical Sciences 46 (2004) 1195–1212 [10] Asnafi N, Skogsga˚ rdh A.