32results about How to "Low cycle fatigue" patented technology

Components and methods of processing such components from precipitation-strengthened alloys so that the components exhibit desirable grain sizes following a supersolvus heat treatment. The method includes consolidating a powder of the alloy to form a billet having an average grain size. The billet is then forged at a temperature below the solvus temperature to form a forging having an average grain size of not coarser than the grain size of the billet. The billet is then forged at a total strain of at least 5%, after which at least a portion of the forging is heat treated at a temperature below the solvus temperature to pin grains within the portion. The entire forging can then be heat treated at a temperature above the solvus temperature of the alloy without coarsening the grains in the portion.

A turbine bucket and wheelpost assembly reduces the number of buckets in the third stage of the turbine from ninety-two to ninety while reducing stresses at the assembly points of the buckets and wheelposts. The buckets and wheelposts are formed with complementary fillets and tangs that provide for the insertion of the bucket into the broach slot between two wheelposts. The angles of the fillets on both the bucket and wheelpost range from 50° to 59°. The upper surface of the wheelpost is scalloped to reduce weight and the tangs and fillets of both the bucket and wheelpost are formed from curved and straight surfaces to reduce stresses on the assembly.

A guide vane for a gas turbine includes a vane body having a leading edge and a trailing edge and a shroud extending at least between the leading edge and the trailing edge. The shroud has a first side wall and a second side wall extending essentially radially and in a longitudinal direction of the gas turbine. The first side wall has a groove disposed in a region of the trailing edge extending in a longitudinal direction of the shroud and is configured to receive a sealing plate. The first side wall also has a clearance extending from the groove in a region of the trailing edge, wherein a depth of the clearance in a circumferential direction of the gas turbine is equal to a depth of the groove, and wherein a width of the clearance in the longitudinal direction of the shroud is between one to three times the depth of the clearance.

The present invention proposes and invents a replaceable energy-dissipating connection assembly applied to the beam-column connection of the assembled frame. It is composed of rods, restraining parts and connecting parts. One end is connected to the node anchor reinforcement embedded in the column, and the other end is connected to the beam end longitudinal reinforcement embedded in the beam. Under the action of earthquake, the energy-dissipating steel bar yields before other components and components and uses plastic hysteresis to dissipate the seismic energy. This kind of replaceable energy-dissipating connection component is used for the connection of prefabricated beams and columns in prefabricated frame structures. It can induce the plastic damage of the structure to concentrate on the energy-dissipating steel rods under moderate and large earthquakes, and can improve the seismic ductility of the structure while avoiding the damage of beams and columns. For component damage, the structure can be quickly repaired by simply replacing energy-consuming components after an earthquake, so that the post-earthquake repair efficiency of the structure is significantly improved. The application of replaceable energy-consuming connection components meets the requirements of building industrialization development.

The present invention relates to a method of manufacturing magnesium alloy processing materials capable of improving low cycle fatigue life. The manufacturing method for magnesium alloy processing materials with improved low cycle fatigue life comprises pre-straining a magnesium alloy processing material which is processed.

A system for reducing low cycle fatigue of a soldered connection includes a controller and a heating element operatively connected to the controller. The system also includes a printed wire board soldered in connection with an electronic component. The controller is configured to retrieve a signal indicative of a temperature of the electronic component, and compare the temperature to a stored predetermined range of operating temperatures. Responsive to determining that the temperature of the electronic component is less than a lower threshold temperature of the predetermined range of operating temperatures, the controller transmits a signal to the heating element that causes the heating element to heat the electronic component. The controller then saves, to an operatively connected computer readable memory, a magnitude of temperature difference and a number of times that magnitude is reached. The controller uses the stored information to track the life of the electronic component.

The invention discloses a characterization method of material fatigue, creep, and fatigue-creep interaction service life, and belongs to the field of service life prediction of aero-engine critical materials. The characterization method is used for solving service life characterization and prediction problems of materials under low cycle fatigue, creep, and fatigue-creep interaction conditions. According to the principles, a power function form service life prediction method non-linear behavior characterization capacity is established via fatigue-creep interaction, low cycle fatigue, and creeptests of materials at different holding time, and obtaining of effective holding time and normalization dimensionless service life via normalization calculation method. The characterization method iscapable of realizing accurate characterization of service life of materials under low cycle fatigue and fatigue-creep interaction conditions, and especially, consideration and accurate prediction ofcreep service life can be realized. The advantages of the characterization method are that consideration of both physical mechanisms and model implementation convenience is realized, and material lowcycle fatigue, creep, and fatigue-creep interaction service life characterization and prediction problems are solved effectively.

The present invention proposes a replaceable energy-dissipating connection assembly for beam-to-column connections of fabricated concrete frames. The upper side and / or the lower side of the end, including one or more energy-dissipating core steel plates (1) arranged side by side, an anchor block inside the column ( 2), the anchor block (3) in the beam located at the other end of the energy-dissipating core steel plate (1) and embedded in the corresponding position of the concrete at the beam end during the prefabrication stage, and the restraint system (4) surrounding the energy-dissipating core steel plate (1); The core steel plate (1) and the anchor block in the column (2) and the anchor block (3) in the beam are reliably connected to form a continuous force transmission component. The application of replaceable energy-consuming connection components meets the requirements of building industrialization development, has the advantages of mass production and rapid assembly construction, and at the same time greatly reduces the difficulty of post-earthquake repair of the structure.

The invention provides a high-temperature resistant tungsten-molybdenum alloy and a preparation method thereof. The weight percentages of each group are as follows: tungsten: 50-80%, molybdenum: 35-50%, rhenium: 10-30%, zirconium: 2-5%, Impurities: 0.1-1%. The preparation method is to mix various metal powders evenly, dehydrate in a vacuum, sieve, and mix. After pressing, they are placed in a smelting furnace for sintering. After sintering, they are cooled and made into filaments or ribbons. The preparation method of the invention has a simple process, good material properties, and good high temperature resistance, and is particularly suitable for making high temperature resistant accessories such as filaments for LED car lights.

A method by which high temperature properties of a ductile iron alloy, including creep and LCF properties, can be increased for pressure-containing components that are subject to creep and low cycle fatigue. The method comprises modifying the ductile iron alloy to contain 0.4 to 0.8 weight percent molybdenum. A casting of the modified ductile iron alloy is produced and then annealed at a temperature of at least 725° C. for not less than five hours to eliminate carbides and / or stabilize pearlite in the casting. The annealed casting of the modified ductile iron alloy exhibits improved creep resistance and low cycle fatigue properties in comparison to an identical casting of a ductile iron alloy that does not contain molybdenum.

The invention discloses a life prediction method for a nickel-based high-temperature alloy blade under thermomechanical fatigue load. It effectively solves the problem of joint characterization and life prediction of low-cycle fatigue damage, creep damage and oxidative environment damage of nickel-based superalloy blades under TMF load. Low-cycle fatigue life data, fitting the strain-life equation, combining the fatigue damage linear accumulation theory to obtain the fatigue damage model, expressing the creep damage model as a function of temperature, stress and time, and based on the continuous oxidation-cracking mechanism of the oxide layer at the crack tip To model the damage in the oxidizing environment, the continuous damage accumulation mechanism is adopted for the above three models, and the stress, strain, and temperature data of the dangerous position of the blade are used to realize the joint damage model for nickel-based superalloy components under thermomechanical fatigue loads. Accurate and reliable unified characterization and lifetime prediction of damage from fatigue, creep, and oxidation interactions.