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For above factors, the coiled tubing always faced problems of material degradation, plasticity reduction which caused the brittle failure as the load far lower than yield strength.
Through welding process simulation of ANSYS software and a large number of experimental research, finally optimizes the residual stress relief process of the weld and the tube body, to realize the effective reduction of residual stress process of the finished tube.
All these data certified that the full body stress relief treatment largely reduced the residual stress in the raw material of CT80S.

Attributable to the reduction in both rolling gaps, the material flows primarily tangentially in circumferential direction.
A low value (< 0.05, less than 5% of the measured data underlie statistical variance) stands for a statistically high significance, whereby a high value shows a high impact of chance.
Kopp, Analysis of the machining allowances in ring rolling of square cross-sections and proposals for their reduction, Stahl und Eisen 106 (22), 1986, 1207-1212

In particular, different researches are now focusing on the idea of integrating the concept of metamaterials (materials with a property that is not found in nature) in part geometry to enhance mechanical properties and weight reduction [7-8].
Configurations Load [N] Maximum Stress [MPa] X displacement [mm] Z displacement [mm] original 158 229 0.35 0.45 1 92 224 0.14 0.05 2 112 225 0.22 0.04 3 98 256 0.12 0.03 4 107 230 0.15 0.10 How it is clear from the obtained data, the presence of the reinforcement and its length and width had an influence on the maximum stress that occurred in the structure.
In particular, the authors found good results in terms of load and maximum stress reduction when the cell has: a connector with a core thickness increased by 50%; an external fillet radius equal to the connector thickness; a connector inclination equal to 40°.

Table 2 Chemical composition of LX70A steel cord /wt% C Si Mn P≤ S≤ Cr≤ Ni≤ Cu≤ Ti≤ Als≤ N≤ 0.70-0.74 0.17-0.30 0.40-0.60 0.012 0.010 0.10 0.10 0.10 0.01 0.005 0.005 Table 3 Mechanical property of LX70A rod Tensile strength Rm, MPa Elongation A, % Reduction of area Z, % 1050±40 ≥12 ≥45 Production Process (1) Smelting process The converter smelting uses the technology of tapped-on-carbon, assuring C≥0.50%, P≤0.008% in the end.
Table 5 Mechanical properties of LX70A testing rod Item Tensile strength Rm, MPa Elongation A, % Area reduction Z, % Maximum Minimum Mean 1080 1030 1060 21 16 18 58 47 52 (4) Structure control of rod Rod for steel cord carries out controlled cooling in Stermore air cooling line after rolling, obtain sorbitic structure approaching lead bath isothermal treatment, which has higher strength and well plasticity, well draw property, the more sorbitizing, and more fit to draw[6].
It can be seen from the data that every performance index of steel cord manufactured by Angang can satisfy the requirement of steel cord industry for meridian tyre.

This path is prompted by the reduction in free energy when locally eliminating a part of the interfaces.
Solid and dashed lines represent results assuming different thermodynamic data; linearized phase diagram presented in Fig. 1 as solid line and the phase boundaries proposed by Wells et al. [[18] C.
This can be attributed to the reduction of diffusion distance as the interlamellar spacing decreases.

With time, as the melt rose up inside the hole to compensate for the reduction in the volume of the air bubble, the interface would change to have a more spherical shape which would have a maximum arc of a hemisphere of 6 mm diameter (with a surface area of 56.5 mm2).
Prediction of reduction of volume with time of a bifilm moving through an Al melt.
Chase, JANAF Thermochemical tables, in: Journal of Physical and Chemical Reference Data, Michigan: American Chemical Society/American Institute of Physics for the National Bureau of Standards, Vol. 14, 1985.

Methods adopted include Monte-Carlo method, which is taken by figuring out the failure times through extensive numerical simulation so as to solve the failure probability, stochastic finite element method, which is taken by combining the probability theory with stochastic finite element method, and response surface method, which refers to the fact that the data drawn from structural analysis fits the response surface approximation function.
It is generally about the dimension reduction of the calculation of the multidimensional normal integral.
The dimension reduction of the approximate calculation can be divided into two types: one is to transform the multivariate normal integral into the product of many one-dimensional normal integral based on the principle of conditional probability.

Reducing input signals of EHA causes the spools movements to their neutral position and flow rates' reduction.
This leads to a reduction of the total consumption flow.
These estimates are correlated with objective data.

The heating rate was 4°C / min, the data were collected every 5 °C, the values of resistance R were directly measured, the resistivity was calculated according to the formula ρ=RWd/L≈0.48Rd, and then the curve of resistivity vs. temperature was obtained.
With the increase of strontium doping content from 0.1 to 0.6, the tolerance factor increases gradually from 0.961 to 0.975, indicating the reduction of lattice distortion, and thus the FeO6 of distortion state turns into a regular octahedron [13].
This is mainly because the enhancement of the scattering effect of grain boundaries for polycrystalline samples on carriers, and the reduction of carrier migration rate.

One of the aspects of the use of vpy is that this ligand allows polymerization by reduction of vinyl groups, thus avoiding the dissolution of the metallic substrate during synthesis.
This confirms literature data obtained for the same complex deposited on platinum 11 and 17-4 PH stainless steel 28
It was observed a decrease in the icorr around 25 times in addition to a decrease in the potential about 200 mV, indicating a more pronounced effect in the cathodic reaction, related to the oxygen reduction.