40results about How to "Uniform strain distribution" patented technology

A coiled tubing connector having a body and a plurality of entry or transition sections connected to the body wherein the connector has a low cycle fatigue life of at least 30%, more preferably at least 50% of the coiled tubing. A preferred embodiment contains two shoulders that form an annular void, a plurality of centralizers about an exterior of the body, and / or a plurality of elastomer molds separating the centralizers. The connector is preferably longer than the connectors of the prior art and is a composite of fluoroplastics or aluminum alloys.

Embodiments of the present invention provide a system and a method for increasing the harvested energy from a piezoelectric element exposed to environmental vibrations via a two-prong system. In a first prong, a cantilever beam is tapered and shaped so as to increase and provide an approximately uniform strain on and along the beam, thus resulting in increased voltage. In a second prong of the system and method, a voltage compensating circuit, when used with a voltage inversion circuit of the prior art, increases the harvested power by injecting current to the piezoelectric element after each voltage inversion so as to increase the voltage level.

The invention belongs to the field of pressure processing of steel materials, particularly relates to a forging-and-rolling compounded forming method for comprehensively promoting internal and external quality of wide and thick plate blanks. Numerical simulation technique is adopted to study internal strain distribution of the plate blanks formed by pure rolling, pure forging and the forging-and-rolling compounded forming method, and the forging-and-rolling forming method is provided and includes steps of 1), firstly heating the plate blanks to be cast; 2), subjecting the plate blanks to forging and deforming in a large hydraulic press after heating the same; 3), returning the plate blanks to be forged in a heating furnace for heat preservation after forging and deforming; and 4), delivering the forged plate blanks in a heated manner to a rolling mill to be rolled after heat preservation or cooling the same slowly to room temperature prior to being heated and rolled again. The forging-and-rolling compounded forming method has the advantages that the forging-and-rolling compounded forming method is applicable to forming process of various molded wide and thick plate blanks (slab ingot), especially to blanks with central looseness; by the method, the defect of core density loose of the wide and thick plate blanks can be overcome, micro-segregation can be alleviated, and texture of the plate blanks can be refined and distributed well; and meanwhile, surface quality of the steel plates can be guaranteed, working allowance can be reduced, and the finished wide and thick plate blanks with 'internal solidness and external refinement' can be realized.

The invention discloses a reinforced concrete column with non-adhesive ends and a preparation method thereof. All longitudinal reinforcing bars in plastic hinge regions at both ends of the column are respectively sheathed by a steel strip corrugated pipe of which the length is twice of the height of the column section, and a 914 adhesive is utilized to attach foam gaskets to the two ends of the corrugated pipe, so that the foam gaskets and the bars in the region form a closed integral body; and thus, a non-adhesive section with a certain length is formed between the longitudinal bar at partial ends and the concrete. The bar strain distribution at the non-adhesive section of the column ends can be uniform, and a yield section with synchronous and slow stress increase is formed, thereby postponing and even preventing the buckling fracture and resilience degeneration, effectively enhancing the ductility and energy consumption capacity of the column end plastic hinge regions, and obviously improving the damage of the concrete in the region due to binding force. The whole system has the advantages of simple structure and favorable economical efficiency, and is convenient for construction.