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It has been tested successfully both on the integrated braking facility in lab and in the oil field. And it proved that the PWM valve have great prospects on the braking system. Introduction With the development of electronic technology and higher drilling requires, the hydraulic disc brake has widely applied on the oil rig as a new braking system since the first decade of new century [1]. In order to achieve the drilling automatically, the auto-drilling system which is composed of hydraulic disc brake and control system is developed and widely used.

Apparently, the tendency of the propagation paths for the two slant crack specimens with different initial slip angle can be numerically described by use of LFF method. Correspondingly, Fig. 7 shows the comparison of propagation paths between experimental and numerical results in detail, where abscissa axial x means the horizontal distance from crack tip to the loading line, ordinate axial y stands for the vertical distance from crack tip to the symmetry plane of CT specimen. Seen from Fig. 7, the experimental and numerical crack propagation paths are close together at the beginning for different initial slip angle.

Zr-4 alloy has evident cyclic strain hardening at different temperatures corresponding to its monotonic stress-strain relations. Fig. 7 presents the tensile and cyclic constitutive curves of zircaloys at different temperatures. Compared with the uniaxial tensile behavior, the cyclic stress amplitude for all the zircaloys at different temperature is higher at the same value of strain in the plotting of strain versus stress, and it implies that all the zircaloys exhibit the character of cyclic hardening evidently at different temperatures.

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