50 results about "Stress failure" patented technology

A connector and method for electrically connecting adjacent solar cells together in a solar module. The terminals of the cells are connected with individual lengths of an electrically conductive material such as an electrically conductive metal ribbon. A substantial portion of the mid section of the ribbons remain unsoldered to thereby provide a stress relief zone in the ribbon between the cells to alleviate stress failures in the ribbons.

The invention provides steel for a pumping rod resisting casinghead gas corrosion and a manufacture method thereof. The steel comprises the following chemical compositions by mass percentage: 0.05 to 0.25 percent of carbon, 0.50 to 2.00 percent of silicon, 1.10 to 2.50 percent of manganese, 0.02 to 0.50 percent of molybdenum, 0.02 to 0.50 percent of nickel, 0.50 to 1.50 percent of chromium, 0.01 to 0.10 percent of vanadium, 0.005 to 0.050 percent of aluminum, 0.02 to 0.10 percent of niobium, 0.05 to 0.50 percent of copper, 0.01 to 0.10 percent of titanium, less than or equal to 0.015 percent of sulphur, less than or equal to 0.020 percent of phosphorus, and the balance being ferrum. The method is to manufacture a pumping rod wire through a design of adding the niobium and other trace alloy elements and corresponding compositions into steel, and controlled rolling and controlled cooling organization control technology. The pumping rod manufactured by the wire has excellent oilwell medium corrosion resistance, proper strength, excellent plastic tenacity and excellent welding performance, thereby improving the service life and reliability of the pumping rod, and improving the whole stability of pumping equipment, and further solving the problem that the prior pumping rod has repeated stress failure caused by endurance of complex casinghead gas corrosion.

The invention discloses a multi-element acceleration factor calculation method of electronic equipment. The method includes: respectively constructing single-point stress damage models for different elements influencing life of the electronic equipment, and calculating and obtaining corresponding acceleration factors; constructing a competition failure-based failure model of the entire electronicequipment on the basis of the characteristics of the electronic equipment and the single-point stress damage models; and calculating and obtaining acceleration factors of the electronic equipment on the basis of the constructed fault model of competition failure according to a statistical equivalence principle. According to the method, for the current electronic equipment of which an equipment structure and failure modes are complicated, failure mechanisms and failure forms under various stress conditions of temperature, humidity, vibration, electrical stress, combinations thereof and the likeare analyzed, a corresponding stress failure model is constructed, and thus the acceleration factors of the electronic equipment can be obtained according to the different elements, the fault model and a corresponding system life model. The method is completely suitable for accelerated testing of the entire-machine equipment, and then enables accelerated testing of the electronic equipment to bemore accurate and reliable.

The invented method for measuring the health of a solid rocket propellant includes embedding at least one piezoelectric capacitance sensor in the propellant, where the capacitance of the sensor is a function of a modulus of the propellant, and where the position is selected to measure manifestations of stress failure as a consequence of changes in the shear modulus. The capacitance of the sensor is measured at a predetermined frequency. The capacitance of the piezoelectric capacitance sensor is converted into a digital representation which is then converted into the digital representation of a modulus (or gradient modulus). In subsequent analysis, the modulus (or gradient of the modulus) is correlated to the health of the solid rocket propellant.

The invention relates to a spot-welding connection failure value simulation system in the car bodywork manufacturing engineering field. In the invention, a circle-stress failure criterion generating module obtains nugget circle stress distribution form according to the failure mode of the spot-welding connection in a strike process to generate the circle stress failure criterion; a failure extreme value stress and an index-parameter obtaining module obtain welding-spot critical failure stress extreme values and dimensionless stress sub-item index initial values under the condition of the peak values of four exterior loads; four types of sample value models which are pulling-cutting, pulling-extending, pulling-bending and pulling-twisting are established in a welding-spot connection value simulation module; an explicit dynamics analysis module couples circle stress failure criteria and obtains the continuous distributed inner stress of a welding-spot unit model and an extreme value stress borne by the welding-spot unit during failure time by simulation; a welding-spot failure material databank module stores the critical failure stress extreme values and the dimensionless stress sub-item index initial values of each stress component. The system not only can enhance the impact simulation precision without impact on the calculation efficiency, but also can reduce the design and exploitation cost.

The administration of aerosolized nitric oxide donors or type V phosphodiesterase inhibitor in controlled doses to horses during high intensity exercise is described. Aerosolized nitric oxide donors (in conjunction with intravenous type V phosphodiesterase inhibitor) and type V phosphodiesterase inhibitor are beneficial to prevent exercise induced pulmonary hemorrhage by reducing transmural pulmonary artery pressure with a concomitant decrease in pulmonary capillary stress failure. The administration of aerosolized nitric oxide donors and type V phosphodiesterase inhibitors is viewed as a novel therapeutic modality in the alleviation of capillary stress failure and EIPH in performance horses.

The invention provides a chip sealing ring structure and a manufacturing method thereof. The manufacturing method comprises the following steps of 1) forming an annular dielectric layer surrounding the chip at a peripheral side of the chip; 2) removing parts of dielectric materials of a central area of the annular dielectric layer and forming an inner dielectric ring, an outer dielectric ring and a plurality of dielectric cylindrical structures located between the inner dielectric ring and the outer dielectric ring; 3) filling a metal material in a blank area between the inner dielectric ring and the outer dielectric ring; 4) removing the metal material of an annular dielectric layer surface till that the annular dielectric layer is exposed. Through manufacturing the plurality of dielectric cylindrical structures and a metal material filling layer in the chip sealing ring structure, the fracture resistance intensity of a chip sealing ring is greatly reinforced so that damages in a chip, which are caused by a stress failure, are avoided during a chip cutting process and other processes and a yield rate of the chip is increased. The structure is simple, and the structure and the method are suitable for industrial production.

A fastener and a method for reducing stress failure in a fastening joint of an internal combustion engine component is disclosed. The threaded fastener may be a bolt or a stud secured to an engine block. The fastener has a threaded tip portion with a radius and a distal end. The threaded tip portion is inserted into a threaded hole to define a threaded interface. In one embodiment, the load carrying capability is increased by progressively reducing the radius of at least a part of the threaded tip portion. In another embodiment, the load carrying capability is increased by an axially extending hole at the distal end of the threaded tip portion, the hole having a progressively reduced diameter.

An internal pulse damper for use in a fuel rail for an internal combustion engine. The damper is formed from a length of tubular metal stock having a flat oval cross-section and ends flattened by crimping to form a captive-air pillow. The end crimps are improved through use of tooling to eliminate a creased sidewall area vulnerable to stress failure in prior art pulse dampers. Such tooling includes constraints to prevent the tubing sides from flaring out and forming a longitudinal crease adjacent the end crimp during squeezing-shut of the tube end

An energy-absorbing connection arrangement with a multitude of connectors for joining two components, such as a transverse member and a circular frame element, of an aircraft fuselage. Each connector comprises a headed shaft and the shafts reach through component boreholes. On the shaft ends facing away from the heads, counter-bearings are provided. At least one of the components comprises a fiber-reinforced plastic material. A head and/or counter-bearing of at least one connector rests against at least one underlay device. The underlay device is received in a guide groove in the first component, with the guide groove commencing in the region of the boreholes. The underlay device, upon exceeding a mechanical threshold load, is slidable away from the boreholes. Energy absorption takes place along a longitudinal center axis of the guide groove as a result of hole-bearing-stress failure and/or the shearing of the fiber-reinforced plastic material component.

The invention discloses a calculation method of a three-dimensional strain failure criterion model of an asphalt mixture. The calculation method comprises the following steps: carrying out strength and rigidity tests in a complex stress state, obtaining failure principal stress of the material, and establishing a stress failure criterion model in an octahedral space and a static resilience moduluscalculation model in the complex stress state; and on this basis, based on the generalized Hooke theorem, establishing an asphalt mixture three-dimensional strain failure criterion model consideringthe rigidity influence through a conversion method. According to the model, the influence of the complex stress state on the strength and rigidity of the asphalt mixture is considered, and synergisticdestructive effect among all strain components is also considered, so that compared with a traditional failure criterion model which does not consider rigidity changes, the nonlinear strength and deformation characteristics of the asphalt mixture can be reflected more accurately, and support is provided for reasonable selection of asphalt mixture material parameters and refined design of a road surface in the complex stress state.

The invention relates to an application of keratinocyte growth factor-2 in the preparation of medicines for preventing and curing lung injury. The invention has the advantages that single-medicine or medicine combination scheme is used to recombine human keratinocyte growth factor-2 (KGF-2) to cure and prevent lung injury/respiratory distress syndrome caused by any factor; and the lung injury/respiratory distress syndrome is in an important position of the special medicine such as the treatment of high altitude lung injury, the military medicine, the sports medicine and the treatment of lung injury/respiratory distress syndrome caused by other diseases. The above diseases can be subclinical, mild, moderate, severe or life-threatening lung injury. Researches show that KGF-2 can maintain the dynamic equilibrium of alveolar surfactants to promote hyperplasia, migrate cells and repair lung injury; and the KGF-2 plays an important role in protecting air-blood barrier to be intact, maintaining the cytoskeletal and intercellular splicing homeostasis, promoting the lung water to be removed and reducing or avoiding alveolus-capillary stress failure.

A rotating cylinder is used to orient wood material, such as but not limited to blocks (e.g., finger joint blocks), preparatory to further processing. The rotating cylinder uses gravity and a tumbling action of the blocks to orient the blocks and move them through the cylinder. Unlike known apparatus such as vibrating conveyors, embodiments of the invention are relatively simple, vibration free, not prone to mechanical stress failures, are quiet, and use minimal horsepower to operate. Furthermore, embodiments of invention may advantageously reduce noise-caused fatigue amongst lumber workers, as well as reduce maintenance and power costs. The rotating cylinder may be part of a larger system for orienting wood material, such as blocks, for further lumber processing.

A subsurface safety valve particularly designed for high temperature and high pressure applications has an improved tubular joint connection that provides for a compliant metal to metal seal without adversely affecting the break out torque. The valve also includes axially extending grooves in the inner surface of the tubular housing in the area of a actuating piston bore to relief stresses in that area thereby reducing the risk of stress failure.

The invention relates to a construction method for reinforcing a heat supply pipeline and a tee joint. The method comprises the following steps that a trench is dug according to a preset depth; the soil quality of the trench is detected; basic treatment is conducted on the bottom of the trench properly according to the soil quality detection result; the heat supply pipeline and the tee joint are laid in the trench and welded together; a first preset amount of 37 lime soil back fills the area, with the tee joint, in the trench, and a second preset amount of medium sand back fills other areas in the trench; powder backfilling soil for covering the 37 lime soil and the medium sand back fills the trench, and is tamped; and natural soil for covering the powder backfilling soil back fills the trench and is tamped. By adoption of the construction method, the possibility of a stress failure at the tee joint of a heat supply pipe network can be effectively reduced.

The invention discloses a rock crack initiation pressure calculation method based on heat-fluid-solid coupling. The rock crack initiation pressure calculation method comprises the steps that basic parameters of a target stratum are determined according to logging information, an indoor triaxial compression test and a Brazilian splitting test; according to the force balance equation, the constitutive equation, the transmission equation, the mass conservation equation, the heat conservation equation, the boundary conditions and the maximum tensile stress failure criterion, a rock crack initiation pressure calculation model of the Laplace space based on heat-fluid-solid coupling is established; and the rock crack initiation pressure is determined according to the basic parameters of the target stratum, the rock crack initiation pressure calculation model of the Laplace space based on heat-fluid-solid coupling and a Stehfest numerical inversion method. The coupling relation among fluid seepage, thermal diffusion and rock deformation in the shaft is fully considered; the stratum crack initiation pressure can be calculated more accurately, high-precision parameters are provided for fracturing construction design, and the requirements for reservoir evaluation and fracturing transformation guidance are met.

The present disclosure provides an inorganic material film layer, a thin film encapsulation layer, a display substrate and a manufacturing method thereof, the inorganic material film layer comprising:a first film layer including a first surface; and a second film layer which is formed on the first surface of the first film layer, the second film layer comprises a second surface located on the side away from the first film layer, and the surface tension of the second surface is larger than that of the first surface; the first surface comprises a central area and a peripheral area, the orthographic projection of the second film layer on the first surface is smaller than the area of the first surface, the second film layer covers the central area, and the peripheral area is not covered by the second film layer to form a peripheral exposed area. According to the inorganic material film layer provided by the invention, the organic material film layer can be fully leveled during ink-jet printing, an overflow phenomenon does not occur, the thickness of the film layer is ensured not to be too thick, and the risk of stress failure can be reduced.