9 results about "Cyclic deformation" patented technology

The invention discloses a follow-up type back shielding gas device for vacuum laser welding, relates to the technical field of welding, and aims to solve the technical problems that the welding quality, the mechanical property and the service life are reduced and the size of a workpiece is out of tolerance due to metal vapor deposition. By means of the double air curtain design of inner-layer main protection and outer-layer auxiliary isolation, negative pressure suction is matched, high-purity argon is accurately distributed, invasion of harmful gas is thoroughly blocked, and the welding metallurgy quality is guaranteed from the source; by means of a three-stage system of magnetic attraction pre-separation, foam nickel interception and activated carbon fiber deep purification, metal steam impurities with different particle sizes are efficiently intercepted, the situation that deposition influences the welding seam precision is avoided, and the welding high-precision assembly requirement is met; a thermal response self-excited vibration structure is integrated, the adsorption material is driven by material thermal expansion difference to circularly deform, particles are vibrated off to prevent blockage, the adsorption efficiency and airflow channel stability in the welding process are maintained, frequent shutdown is not needed, and continuity and high-quality output of vacuum laser welding are guaranteed.

The invention relates to an article made from a thermoplastic polyurethane composition having that has high flex modulus, low density, and is capable of withstanding repeated cyclic deformation. The thermoplastic polyurethane composition is formed from the reaction product of a polyol component, which includes a blend of a polyether polyol, such as poly(tetramethylene ether glycol), and polybutadiene diol, a diisocyanate component, and a chain extender component.

Provided are a method and a system for testing the resilience of an electronic device (8) coupled to a component (1) of a tire. 【Solution means】It includes a step of determining a first shape (F1) that the component takes during use, a step of determining a second shape (F2) different from the first shape (F1) that the component takes during use, a step of creating a support (11) including the electronic device (8), a step of subjecting the region of the support (11) where the electronic device (8) is disposed to a series of periodic deformations such that the region can alternately take the first shape (F1) and the second shape (F2), and a step of detecting the operation of the electronic device (8) while the support (11) is being subjected to the periodic deformations.

The present application relates to the technical field of high-temperature component creep fatigue test and life assessment, and particularly relates to a high-temperature structure deformation accumulation dynamic creep fatigue load design method under a peak regulation working condition. High-temperature creep performance, cyclic deformation performance, a target test temperature, a typical start-stop number or equivalent cycle number, a main load level range during steady operation, and basic parameters of stress / strain control capability of a testing machine of a target high-temperature structure or a sample thereof are obtained. A stress / strain hybrid control mode is used to generate a dynamic creep fatigue load waveform of the high-temperature structure or the sample thereof. When a dynamic creep fatigue load is executed on a creep fatigue testing machine and a cycle feature meets preset stability and repeatability criteria, the load design is determined to be effective. The present application is easy to implement on existing equipment: the designed load waveform can be realized through software control on a creep fatigue testing machine with stress / strain double closed loop and program loading function, without the need to increase additional hardware, and the engineering operability is strong.

The invention discloses a construction method of a dielectric elastomer force-electricity coupling three-dimensional fractional order constitutive model. The construction method comprises the following steps: S1, establishing a force-electricity coupling fractional order tensor constitutive relation under a constant strain rate condition; s2, considering the thickness change of the dielectric elastomer in a uniaxial deformation process, and correcting a force-electricity coupling fractional order tensor constitutive relation; s3, calculating the uniaxial deformation response of the whole stage under the condition of introducing cyclic load; s4, carrying out numerical processing on the model, and determining model parameters through fitting strain rate related force-electricity coupling experiment data; and S5, establishing a relation criterion between the model parameters and the strain rate, and constructing a strain rate-related force-electric coupling three-dimensional fractional order constitutive model. The invention provides a strain-rate-related three-dimensional fractional order constitutive model which is convenient to apply, clear in physical concept and capable of meeting the precision requirement aiming at the DE force-electricity coupling cyclic deformation behavior, so that the defects of an integer order model and a one-dimensional fractional order model in the process of describing the DE force-electricity coupling cyclic deformation behavior are overcome.

The invention relates to a structured packing bed for a column for mass transfer and / or heat exchange between a first and a second fluid phase, wherein the column for mass transfer and / or heat exchange is designed for operation at a pressure of at least 6 bar, wherein the structured packing bed comprises at least two layers, wherein the at least two layers are stacked vertically on top of each other, and wherein at least two of the at least two layers each comprise at least one structured cross-channel packing element having a specific surface area of 60 to 500 m2 / m3 and a height of 50 to less than 150 mm, wherein at least 50% of all structured cross-channel packing elements are blocks, wherein each block comprises a plurality of sheets having periodic deformations, wherein the sheets are arranged parallel and in contact with each other in a longitudinal direction such that between them an open space is provided extending from one end of the sheets to the opposite end, wherein the open space is defined by the periodic deformations, wherein adjacent sheets are oriented such that the periodic deformations of adjacent sheets intersect each other in a cross-like manner, and wherein at least one of the structured cross-channel packing elements of a layer is rotated by 70 to 110° with respect to at least one of the structured cross-channel packing elements of an adjacent layer.

The edge-strengthened flexible gear comprises a cylinder, the cylinder comprises an upper edge strengthening section, a middle gear ring section and a lower smooth cylinder section, the inner diameter of the edge strengthening section is gradually reduced towards the middle gear ring section, the minimum inner diameter of the edge strengthening section is larger than the inner diameter of the middle gear ring section, and the edge strengthening section is not in contact with a wave generator; the edge strengthening section, the gear ring section and the cylinder section cooperatively generate periodic deformation, the generation or expansion risk of fatigue cracks on the edge of the flexible gear is reduced, and the edge strengthening section can guide stress to be distributed along a wider area instead of being concentrated on a certain specific point. By means of the stress dispersion effect, the risk of fatigue crack generation is remarkably reduced, and the fatigue resistance of the flexible gear is improved. Due to the gradual change characteristic of the edge strengthening section, stress can be gradually absorbed and dispersed in the deformation process, and therefore stress peak values are reduced. This helps to reduce the risk of fatigue crack generation.

According to the disc repairing device and method, an oval center cam is used for driving a flexible gear to generate periodic deformation waves, fluctuation is transmitted to a special multi-layer composite structure in the flexible gear through differential engagement with a rigid gear, finally, a coating on the surface layer is driven to generate high-frequency micro-amplitude swing, and when the swing is combined with rotation of a polishing pad, the polishing pad is driven to rotate. And a complex net-shaped grinding path is formed, high points on the surface of the polishing pad can be selectively and greatly removed, so that the flatness after finishing is effectively improved, the performance of the polishing pad is uniformly recovered, and the polishing quality of a final silicon wafer is remarkably improved.

This invention provides a method for plasticizing and strengthening TRIP duplex stainless steel, relating to the field of steel material manufacturing technology. The method includes: S1, smelting according to the chemical composition of duplex steel to produce TRIP duplex stainless steel billets; S2, obtaining an initial microstructure with uniform ferrite and austenite distribution; S3, subjecting the initial microstructure to cyclic deformation pretreatment to create a multi-scale structure within the two phases; and S4, performing mechanical property analysis on the pre-deformed TRIP duplex stainless steel. This invention reduces process difficulty by performing cyclic pre-deformation pretreatment on TRIP duplex stainless steel. By preparing a multi-scale structure within the two phases through cyclic pre-deformation, it effectively regulates the strain distribution during tensile deformation, promotes the early, uniform, and stable occurrence of martensitic phase transformation during deformation, and increases the saturation value and transformation amount of martensitic phase transformation. This achieves simultaneous improvement in the strength and plasticity of TRIP duplex stainless steel, effectively enhancing its comprehensive mechanical properties.