68 results about "Effective strain" patented technology

Methods of predicting earth stresses in response to pore pressure changes in a hydrocarbon-bearing reservoir within a geomechanical system, include establishing physical boundaries for the geomechanical system and acquiring reservoir characteristics. Geomechanical simulations simulate the effects of changes in reservoir characteristics on stress in rock formations within the physical boundaries to determine the rock formation strength at selected nodes in the reservoir. The strength of the rock formations at the nodes is represented by an effective strain (εeff), which includes a compaction strain (εc) and out-of-plane shear strains (Υ1-3, Y2-3) at a nodal point. The methods further include determining an effective strain criteria (εeffcr) from a history of well failures in the physical boundaries. The effective strain (εeffcr) at a selected nodal point is compared with the effective strain criteria (εeffcr) to determine if the effective strain (εeff) exceeds the effective strain criteria (εeffcr).

The invention discloses a special-shaped blank continuous casting secondary-cooling roll gap adjustment method which includes the steps: (1), dividing four heat-transfer areas between two pairs of pinch rolls in a continuous casting drawing direction of a special-shaped blank, respectively calculating length and heat flux of each heat-transfer area and calculating water density distribution along the circumference of the casting blank section within a water spraying area and area value of the water spraying area; (2), constructing a two-dimensional heat-transfer model and calculating to obtain distribution of temperature of a casting blank at different solidification stages; (3), according to parameters of mechanical behavior under high temperature and phase transformation behavior of steel grades, building a special-shaped blank continuous casting strain model under high-temperature stress and calculating effective strains of the casting blank at different solidification stages; (4), according to the effective strains, calculating instantaneous strain rate of the casting blank so as to calculate and make a secondary-cooling roll gap shrinkage curve of feature positions of the continuous casting blank of the special-shaped blank.The roll gap shrinkage curve provides a theoretical direction to arrangement and adjustment of roll lines during actual production of special-shaped blank continuous casting.The method has the advantages of improving adjustment precision of the secondary-cooling roll gaps and effectively controlling and improving continuous casting quality of the special-shaped blank.

The invention discloses a high-impact piezoelectric accelerometer. The high-impact piezoelectric accelerometer comprises a hollow installing seat, a core is arranged in the hollow installing seat through a compressing ring in a press fit mode and is connected with a cable through a plug, one shock insulation cushion and one insulating cushion are arranged between one end of the core and the compressing ring, and another shock insulation cushion and another insulating cushion are arranged between the other end of the core and the installing seat. Because the shock insulation cushions large in damping are installed at the two ends of the core of the piezoelectric accelerometer, high-frequency large-amplitude acceleration generated by strong-impact waves on a structure can be filtered out, and transverse acceleration transmitted to an acceleration sensor can be reduced so as to achieve the purpose of reducing zero drift. Due to the adoption of a base strain isolation type structure, strain of sensitive elements can be effectively reduced; because the insulating cushions are arranged at the two ends of the core and serve as isolators, the accelerometer can be isolated from an installing face mechanically so that effective strain transmitted to the accelerometer can be reduced and the purpose of reducing zero drift can be achieved.