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Combine the above graphical analysis with the actual test process, there is a zero-crossing point in the initial magnetic signal is mainly related with the initial residual stress, grain size and phase, inclusions and other factors.
From 3mm to 60mm, although the displacement has a large increase, the load only increases about 12KN, this stage is strengthening stage, there is an increase in stress in this time, and there is also a certain deformation, leading the magnetic signal curve to keep the same trend basically, it only has some changes in amplitude. when close to 90mm, Specimen produces a strong plastic deformation, the upper compressed layer become larger intensely, The lower stretched layer become smaller, on one hand, intense plastic deformation lead to stress release, it make the stress concentration disappear; on the other hand, intense plastic deformation produces a large number of defects and internal stress in the crystal, they make the magnetic permeability declined significantly, and the greater deformation, the more decline, thus resulting in magnetic memory signal when loaded 90mm all became negative, and the amplitude is relatively small.

The Numerical Simulation Model It is well known that rocks are inhomogeneous material that containing many types of micro cracks, joints and grains with different sizes, which leads to its anisotropic and nonlinear deformation behavior.
The numbers in the time step indicate when the cutters and the displacement increment are applied on the top of the rock specimen.

Through adjusting numbers of CBN grain, type and proportionment of adhesive agent, the tools materials toughness was improved.

According to the design goals, with reference to the pre-project research results [3], macroporous concrete without sand made of Mengdian brand 42.5R ordinary portland cement as cementitious materials, crushed stone in grain size 20-30mm as coarse aggregate.
Timely watering after planting, because of thin nutrition soil, increasing the number of watering encountered hot weather to ensure the survival rate of plants.

Impact toughness was carried out with a CYCJ-04A impact toughness tester (impact cycle number was 1000, at the frequency of 2000rpm).
Ichida, Mechanical properties and grinding performance of ultrafine-crystalline CBN abrasive grains, Diamond and Related Materials. 17 (2004) 1791-1795

The corundum is made in Henan, and we choose two grain size shown in Table 2.
Its particle size is 400 mesh numbers.

Mix compositions were prepared taking into account the grain size distribution of raw materials, i.e. the grading curves.
Finely dispersed pozzolanic additives play a significant role as microfillers and supplementary cementitious materials, decreasing the number of fine pores and increasing compressive strength of concrete up to HPC data.

U1t=N2SmdJdt+N2S2∙μ0dHdt (3) U2t=N2S2∙μ0dHdt (4) Where N2 : number of turns in the secondary and compensating coils, Sm : material cross sectional area and S2: total cross sectional area.
Figure 4 shows hysteresis loops from a strip of Fe-(3%wt)Si or M130-27S grain oriented electrical steel.

At the same time, polystyrene particles decompose at the high temperature to leave a large number of closed porosity with pore size 2-3mm, which make the red mud sintered brick has good thermal insulation performance.
The fine particles with high solubility and the convex portion of the general surface of the particles are dissolved into the liquid, and transfer through the liquid phase to another surface of the coarse particles with low solubility and settle down, until the grain growth and body pyknotic[4].

Introduction The production yield of superalloy precision casting part is 20%~30%, and for the complex shape part this number comes to only 10%.
Domestic researchers have carried out the investigation on equi-axed grain and parts of directionally solidified superalloy, and also have got some progress.