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Introduction Rock mass is the aggregation of various mineral in the nature, and there are many discontinuities found at all scales, from grain boundaries to joints and regional faults within it.
A number of experimental studies[1] and numerical methods[2,3,4] have been performed to investigate the failure process of rocks or rock-like materials.

Figure 3 shows a simulation result of dendritic growth, grain selection, and peritectic formation of austenite from primary ferrite and liquid during directional solidification for a ternary Fe-C-Mn alloy.
It should be mentioned that in microstructure modeling, if phase equilibrium calculations are needed, various measures limiting number of such calculation can be taken in order to improve the computational efficiency.

However, even thus initial cast morphology is sound, high temperature component like turbine blade will end up to form creep vacancy and coarsened phase in grain boundary due to longer expose to high temperature.
Size and number of pore is a little bit decreased while comparing to casting, but it is determined that there is no significant difference with consideration of difference in morphology by specimen and location.

Its the biggest particle size, crush value, huge-area (mass fraction) and needle sheet-shape grains content (quality and several) need to meet the requirements in Table3.
serial_number=200608-100 [4] Zhen M L,Chen S F,Wang C T.Journal of Chang an University( Natural Science Edit ion)2006, 26(4):20-25 [5] Su K X.

In addition, the D band at 1357 cm-1 becomes prominent, indicating the significant number of defects in the GO, which are associated with vacancies, grain boundaries, and amorphous carbon species [9].

Mechanical factor is a removal machining with the polishing grain within slurry.
This design led to investigating the effects of three factors in a single block of 15 sets of test conditions and 3 central points and this design minimizes the number of factor combinations required to evaluate the effects of three factors on a response.

The pavement needs to undertake the action of a large numbers of vehicles as well as from long term severe environmental exposure.
Its crushing value for 7.8%, continuous graded aggregate well grained, specified （JTG F30-2003）.

Moreover, the magnesium hydroxide grains grow bigger as the preparation reaction time is increasing.
Acknowledgments This work was supported financially by the New Experimental Development of Xidian University of China, where the projects number is SY1469.

Fig.1 Microstructure of Cu-Al2O3 composites after extrusion a) Cross section b) vertical section Origin, principle and application of cumulative extrusion severe plastic deformation method Cumulative extrusion severe plastic deformation method is based on Refinement of Grains by processing cold-rolled and cold-drawed.In recent years, with the development of nano-materials,large volume nano-materials is studied to get high-performance and widely application.
It has a great effect on particle distribution or the number of distribution in per unit area (volume), for the larger size of particle ,the less distribution.

Its purpose is "to make every grain of sand in the world can have an IP address",and to solve a number of deficiencies inherent in IPv4.