30 results about "Plastic yielding" patented technology

The invention discloses a damper and the application method, in particular to a braced shear wall coupling beam energy dissipating damper and the application method. The damper comprises a mutual connection plastic yield energy dissipating work area and a keeping approximate rigidity partial fixing area, two or more than two column strip-shaped holes are arranged in work area; non-sharp corner processing is adopted at the upper ends of the strip-shaped hole. The application method of the damper for shear wall coupling beam energy dissipating comprises: the reinforced concrete coupling beam is replaced by one or more than one damper; or one or more damper is adhered to the reinforced concrete coupling beam and is positioned at the coupling beam of the shear wall. Each damper work area is provided with anti out-plane instability bolt to prevent the out-plane of each damper from instability; each damper partial fixing area is pre-stretched by high strength bolt, or each damper is welded into a whole body by cap cover plate.

The invention provides a three-dimensional lattice material based on an electron beam selective melting technology. The three-dimensional lattice material comprises a three-dimensional structure made of pure titanium or titanium alloy and formed by superposition of a plurality of basic units, every basic unit consists of a plurality of isosceles triangles with vertexes coinciding, solid rods serve as the waists of every isosceles triangle, the rest portions of the isosceles triangles are virtual, and every two adjacent isosceles triangles coincide by one of their own waists. The invention further provides a preparation method of the three-dimensional lattice material. The three-dimensional lattice material based on the electron beam selective melting technology is mainly formed by superposition of the basic units, attains stable compression performance after being subjected to electron beam selective melting molding, vacuum annealing and chemical corrosion and shows an obvious plastic yielding platform shape in compression curve, thereby providing stable and reliable computing bases for structure designers.

The invention discloses an elastoplastic-damage finite-element algorithm of considering elastoplasticity and damage coupling of a composite material, and belongs to the field of finite-element analysis of mechanical properties of composite materials. On the basis of a model of carrying out solving of elastoplastic damage of composite materials on the basis of a backward Euler integral rule and Newton iteration, softening influences which are of damage state quantity in a previous incremental step and on current stress are all considered when solving of elastic stress is carried out in initialsolving of trial stress and plastic yielding iteration, thus damage degradation action is considered in an elastoplasticity solving process, and an interaction relationship between plastic behaviors and the damage of the resin matrix composite-material under complex loading conditions is more truly reflected. The algorithm can effectively describe a coupling action relationship between the elastoplasticity and the damage of resin matrix composite-material, and can be applied to the technical fields of scientific research and engineering such as development of elastoplastic-damage constitutive-models of the composite materials in finite-element software, research of mechanical properties of novel resin matrix composite-materials and related refined modeling analysis of engineering structures of the composite materials.

A flexible orthopedic foot splint comprising two shoes containing screw receptacles in the soles; a bar contains one or more small apertures for connecting the shoes to the bar; two or more screws which fit through the apertures on the bar and attaches said bar to the shoes via said screw receptacles in the soles of said shoes; a posterior strut attachment that distally connects to the bar and one shoe via said screw receptacles; half circular cuffs attach to the strut attachment and wrap around an infants calf; said cuff is securely held to the leg via a hook and loop fastener wherein said bar is made of a low modulus plastic yielding great flexibility upon the application of force. With the orthopedic foot splint of the present invention, when a child attempts to stretch and pull his foot into plantarflexion and adduction the present invention allows some motion but limits excessive motion and then springs the foot back into the corrected alignment. As a result of the allowed motion the heel is not forced upwards in the shoe and the risk of the foot pulling out of the shoe diminished.

The invention discloses a support method of a sharp inclined seam roadway. The support method includes the steps that firstly, anchor bolt support is performed, when the roadway is excavated, tunnel face dangerous rocks are removed, an anchor rod installation position is arranged in the direction perpendicular to the inclination of a seam, drilling is performed in the radial direction of the roadway with a drilling machine, and an anchor rod is installed; secondly, spraying net support is performed, a reinforcing mesh is hung on the periphery of a roadway hole and is firmly welded to the anchor rod and an anchor cable; thirdly, roadway bottom arch anchor spraying mesh support is performed, after a bottom arch is excavated according to a designed section, the reinforcing mesh is hung again, and whitewashing support is performed; fourthly, U-shaped steel closing and looping support is performed, U-shaped steel is closed to form a loop, the bottom-body-top mounting sequence is adopted, four pieces of U-shaped steel are symmetrically installed and connected into the loop, and the bottom U-shaped steel and the body U-shaped steel are in lap joint and controlled at the arch waist part; fifthly, base plate backfilling is performed, after backfilling, the base plate is flat, the front gradient and the rear gradient are consistent, and a rail is firmly padded and cannot be suspended. The support method of the sharp inclined seam roadway is simple and convenient to conduct, operation is simple, the effect is obvious, and cost is low. A support structure is safe and reliable, generated surrounding rock plastic yielding area is reduced by more than 70 percent or more compared with a conventional support, and long-term safety and stability of the roadway support structure are ensured.

The invention discloses a method for efficiently and accurately predicting a laminated wood beam ultimate bending moment used for an FRP (Fiber Reinforced Plastic) enhancement structure. The method can judge whether a compression resistance area of a beam body is subjected to plastic yield or not through a strain distribution or stress distribution diagram of the section of the beam body and also can carry out the fine tuning of an interpolation position of a neutral axis through judging whether the tensile stress resultant force and the compression stress resultant force of the bending compression resistance area of the beam body meet a static determinacy balance condition so as to calculate the ultimate bending moment borne on the beam body during bending damage failure according to a real position coordinate of the central axis. On one hand, manpower and material resource consumption in an actual measurement process of a traditional method can be saved, and errors generated in a measurement process are eliminated; and on the other hand, a complex calculation process of the traditional method can be saved so as to realize the quick and accurate measurement of the laminated wood beam ultimate bending moment used for the FRP enhancement structure.

The invention discloses tough oil well cement. The cement is characterized by being prepared from components in parts by weight as follows: 100 parts of cement, 1-15 parts of active filler, 1-5 parts of a toughening material, 0.01-0.05 parts of staple fibers, 1-5 parts of an additive, 0.1-0.2 parts of a water educing agent, 1-5 parts of a fluid loss agent, 1-2 parts of an antifoaming agent and 1-5 parts of a retarder. An oil well cement sheath is high in lateral deformation capacity, low in elasticity modulus, high in plastic yielding point and good in elasticity; the oil well cement ring has very high ultimate strain value, can absorb larger impact energy and greatly improves the deformation performance of set cement compared with raw slurry, so that the requirement for cement performance in the oil and gas well development process is met, and cementing quality and follow-up development are guaranteed.

The invention discloses a layered pressure regulating submersible. The layered pressure regulating submersible can lower the requirement for the preparation process of a shell, remarkably reduces the stress level of the shell, and increases the plastic yielding security coefficient of a compressive cabin, thereby effectively prolonging the fatigue life. According to the layered pressure regulating submersible, the pressure outside the submersible is less than or equal to 120 MPa, and the pressure in the submersible is 0.1 MPa. The layered pressure regulating submersible comprises n layers of spherical shells, and n is an integer greater than one. The spherical shells have the same spherical center, and partial pressure objects filled with specified pressure are arranged in spaces between every two adjacent spherical shells. The invention further provided a manufacturing method of the layered pressure regulating submersible.

The invention discloses high-strength stainless steel for storage equipment. The steel plate comprises, by mass, 0.02-0.04% of C, 11.6-11.9% of Cr, 0.25-0.29% of Si, 0.52-0.63% of Mn, 0.45-0.52% of Ni, 0.15-0.17% of Re, 0.45-0.62% of Zr, 0.017-0.018% of Al, 0.11-0.13% of Y, 0.23-0.31% of Rh, 0.13-0.15% of Ti, 0.75-0.77% of Ca, 0.11-0.13% of B, 0.36-0.41% of W, 0.32-0.35% of Cd, 0.23-0.31% of Mo, 0-0.03% of S, 0-0.02% of P, 0.13-0.26% of rare earth metal, and the balance Fe. The steel plate has excellent transverse yield strength and high plasticity, the yield strength is no less than 450 MPa, the tensile strength is no less than 610 MPa, the steel plate is suitable for the weld heat input of 150-250 kJ/cm, and under the condition of high heat input welding of 150-250 kJ/cm, the average impact power of the HAZ of the steel plate at -40 DEG C is 180 J or over.

This pegboard is injection molded of plastic yielding a unitized flat panel, and rearwardly projecting peripheral flanges and cross webs terminating along a single plane, suited to provide clearance for a cooperating hook between a panel rear face and a flat mounting surface. The pegboard has rows and columns of holes of both nominal ⅛ inch and ¼ inch diameters on one inch centers, to accommodate both conventional nominal size hooks. The respective rows and columns of the different size holes are alternately arranged offset from one another vertically and horizontally, allowing either size hook mounting virtually anywhere on the panel. Locating structures on the rear side of the pegboards provide accurate back to back squared registry positioning of two like pegboards, for cool-down after molding without shape distortion and for stable twin-pack packaging for retail sales.

The invention relates to a multi-point yield energy dissipating type mild steel energy dissipater. The multi-point yield energy dissipating type mild steel energy dissipater mainly comprises a top plate, an energy dissipating plate, a bottom plate and a connecting plate, wherein the energy dissipating plate is arranged between the top plate and the bottom plate; the connecting plate is arranged on the lower surface of the bottom plate; the energy dissipating plate is formed by arranging a plurality of energy dissipating units in an in-plane manner. The multi-point yield energy dissipating type mild steel energy dissipater has the advantages that by adopting the in-plane bending yield stress type, the enough initial rigidity is provided under the action of small earthquake, the energy inputted by the earthquake is dissipated under the action of large earthquake, and a main body structure is protected; each energy dissipating unit is in a symmetric circular arc shape, a plurality of plastic yield points can be formed under the action of the earthquake, the stress is redistributed, the stress concentration effect is effectively improved, and the plastic deformation capability and low-cycle fatigue property are improved; the ductility is good, the structure is simple, the replacement is convenient, the energy dissipating property is good, and an excellent energy dissipating and earthquake-proof member is provided.

The invention discloses a broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device and a using method thereof, and belongs to the technical field of underground engineering supporting. The broken coal roadway reinforced anchoring type yielding grouting anchor rod anchoring device comprises an elastic yielding assembly, a plastic yielding assembly and a reinforced anchoring structure, wherein the elastic yielding assembly is composed of a metal tray, positioning rods, annular vulcanized rubber air bags, metal isolation pieces and a limiting plate; the plastic yielding assembly is composed of a porous metal disc, a necking round rod and a high-strength porous extrusion plate; and the reinforced anchoring structure is composed of a hollow grouting anchor rod, a resistance increasing pawl sleeve and the like. The hollow grouting anchor rod and the resistance increasing pawl sleeve can effectively improve the anchoring strength and improve the mechanical property of the coal and rock mass, and when the coal and rock mass deforms, through coordinated work of the elastic yielding assembly and the plastic yielding assembly, good large-deformation yielding work efficiency is achieved, the anchor rod is effectively prevented from being broken due to overload, and the stability and the use safety of the coal rock mass and the supporting structure are maintained, the supporting requirement of the deep high-stress broken coal roadway is met, and the anchor rod anchoring device has the advantages of high anchoring strength, constant-resistance yielding, reasonable structure and the like.

The invention relates to a glass fiber irregular architecture sandwiched material as well as a preparation method thereof. The glass fiber irregular architecture sandwiched material is composed of an upper panel (1), a lower panel (3) and a chopped glass fiber bundle core material (2) with an irregular architecture; the chopped glass fiber bundle core material (2) with the irregular architecture forms an irregular polyhedral hollow structure by mutually overlapping chopped glass fiber bundles (4) at different angles and is fixedly connected with the upper panel (1) and the lower panel (3). The glass fiber irregular architecture sandwiched material provided by the invention cannot generate plastic yielding in a flat pressing loading process; the glass fiber irregular architecture sandwiched material without plastic yielding changes the common properties of the traditional sandwiched material, and overcomes the weakness that the traditional core material is rapidly collapsed and damaged; the preparation technology is simpler and more feasible.

The invention discloses a metal material plastic yield strength detection device which comprises a testing machine body, a lower cross beam is installed at the lower end of a support of the testing machine body, a lifting upper cross beam is arranged at the upper end of the support, and chuck mechanisms are fixedly installed in the middle of the upper surface of the lower cross beam and the middle of the lower surface of the lifting upper cross beam correspondingly. The chuck mechanism comprises an outer shell, mounting openings are formed in the two side walls of the upper end of the outer shell, a plurality of sliding rails are circumferentially and evenly arranged at the upper end of the inner wall of the outer shell, sliding fan-shaped clamping blocks are slidably mounted on the sliding rails, fan-shaped grooves are formed in the lower ends of the inner ends of the sliding fan-shaped clamping blocks, a vertically-arranged hydraulic telescopic rod is fixedly installed in the middle of the bottom end of the interior of the outer shell, and a lifting disc is fixedly installed at the top end of the hydraulic telescopic rod. According to the chuck mechanism, plate-shaped metal materials can be conveniently clamped, meanwhile, multipoint clamping and fixing can be conducted on columnar metal materials, clamping is firm, and using is convenient.

The invention provides a multi-direction connection steel beam-column joint based on dry method connection. A beam-column joint core area is replaced with profile steel and serves as a connection joint of the beam-column joint, on-site splicing is carried out through bolts, the height of a prefabricated column can be effectively shortened, transportation and on-site rapid assembly are facilitated, the soft steel of the beam-column joint generates plastic yield hysteresis deformation to dissipate earthquake energy, so that the purposes of energy dissipation and shock absorption are achieved, and a plastic hinge is generated at a specified part to realize controllability and replaceability of the plastic hinge. According to the multi-direction connection steel beam-column joint based on dry method connection, the defect that formwork erecting, concrete cast-in-place and curing still need to be carried out on a construction site in current wet method operation is overcome, the construction efficiency is improved, formwork supports are reduced, and the economic benefits are improved.

The invention relates to a vibration deformation residual stress reduction device, which comprises a vibration aging bracket, a vibration stress relief device, a vibration stress relief device and a vibration stress relief device, wherein a bracket for fixing a workpiece is arranged on the vibration stress relief bracket; the tension mechanism is fixed on the vibration aging bracket and is used for applying tension to the workpiece; and the excitation mechanism is arranged on one side of the vibration aging bracket and is used for carrying out aging vibration on the workpiece and reducing residual stress. A workpiece is fixed through the vibration aging bracket; the tension mechanism applies tension to the workpiece; and the excitation mechanism carries out aging vibration on the workpiece to reduce residual stress. Dynamic stress is transmitted through an excitation head installed on a vibration experiment table, when the internal stress of a material exceeds the yield strength of the material under the combined action of the residual stress of the component, the dynamic stress and applied tension, a high-stress area of the component can generate plastic yield, so that the residual stress is reduced and homogenized, and the yield strength of the component is improved. Compared with a traditional vibration aging process, the method has the advantages that the applied tension action is added, so that the residual stress reduction effect is more obvious.

The invention provides a turning bridge with a damping function. The turning bridge comprises a pile foundation, a bridge pier and a beam body; an upper bearing platform and a lower bearing platform are arranged between the pile foundation and the bridge pier; the centers of the upper bearing platform and the lower bearing platform are connected through a spherical hinge; multiple soft steel dampers are arranged between the upper bearing platform and the lower bearing platform, are positioned on the outer side of the spherical hinge, and are arranged around the peripheral direction of the spherical hinge at equal intervals; multiple support feet are arranged in the peripheral direction of the bottom of the upper bearing platform; and concrete mortar is filled between the bottoms of the support feet and the lower bearing platform. The turning bridge uses a special structure of a turning bridge rotating system to cancel traditional sealing compound concrete construction; the soft steel dampers are arranged between the upper and lower bearing platforms of the turning bridge to achieve higher vertical bearing capacity, and can be cooperated with the support feet and the spherical hingeto support a bridge structure; meanwhile, the soft steel dampers can generate plastic yielding and hysteresis deformation to generate higher damping; and a lot of consumptions enter the earthquake energy of the structure, so that the destruction of the bridge structure is prevented, and the earthquake resistance of the bridge structure is improved.