53 results about "Plastic energy" patented technology

The invention relates to a hot-rolled wire rod for a 2060MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod. Mn-Cr high-carbon chemical component design and rolling spinning are performed to form a wire rod, then online molten salt isothermal phase change treatment is performed, the wire rod is firstly subjected to front-section molten salt treatment and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure, and then the wire rod is subjected to rear-section molten salt treatment, so that the hot-rolled wire rod is obtained. The method comprises the following steps of: firstly, carrying out heat treatment on the residual austenite, promoting the unconverted residual austenite to be converted into a sorbite structure, simultaneously promoting isothermal tempering of the structure and fusing of a part of sorbite lamellas, and finally, slowly cooling through a roller way to prepare a hot-rolled wire rod of which a microscopic structure comprises a mixed structure consisting of tempered sorbite, tempered ferrite and fused sorbite, so that the material cost can be controlled; the high-strength and high-plasticity performance matching of the wire rod is improved, the tensile strength is 1370-1420 MPa, the percentage reduction of area is 35%-40%, and the mechanical property fluctuation is reduced, so that the wire breaking risk in stranded wire production is reduced, and efficient and stable production is promoted.

The invention relates to a hot-rolled wire rod for a 2400 MPa bridge cable and a manufacturing method of the hot-rolled wire rod, after high-carbon components of Cr-Mo-V are rolled and spun into a wire rod, the wire rod is subjected to online molten salt rapid cooling isothermal treatment, so that the wire rod is cooled at the cooling speed of more than or equal to 32 DEG C / s and enters a sorbite phase region from an austenite state to form a structure taking sorbite as a main part, and precipitation and growth of carbides are controlled; and finally, roller way slow cooling is conducted, the hot-rolled wire rod with the microscopic structure comprising a mixed structure composed of tempered sorbite, ferrite and fused pearlite is prepared, the strength and plasticity matching performance of the wire rod can be improved, the mechanical property fluctuation can be reduced, the tensile strength can reach 1640-1680 MPa, the percentage reduction of area can reach 27%-32%, the mechanical property same-circle difference is smaller than or equal to 45 MPa, and the tensile strength of the wire rod can reach 1640-1680 MPa, the percentage reduction of area can reach 27%-32%, and the mechanical property same-circle difference is smaller than or equal to 45 MPa. And rapid and stable production is facilitated, the method is used for manufacturing the 2400 MPa bridge cable, and the wire breaking risk can be reduced easily.

The invention relates to a 1300 MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, after a Cr-Nb-V medium carbon component design is adopted for rolling and spinning to form a wire rod, the wire rod is subjected to online molten salt micro-quenching tempering treatment, the wire rod is controlled to enter a lower bainite phase region from a high-temperature austenite state at a cooling speed greater than or equal to 31 DEG C / s, and a quenching structure mainly comprising quenching bainite is formed; the steel wire rod with a microscopic structure comprising tempered bainite and ferrite is prepared by carrying out isothermal tempering and toughening destressing treatment on a quenched structure and finally carrying out roller way slow cooling, so that the material cost can be properly controlled, the strength and plasticity matching of the steel wire rod is improved, the tensile strength is 1255-1305MPa, and the percentage reduction of area is 58-63%, so that the steel wire rod can be directly processed into a part after being subjected to cold processing molding, and the service life of the steel wire rod is prolonged. And tool steel production energy consumption, cost reduction and efficiency improvement are facilitated.

The invention discloses a high-strength and high-plasticity medium alloy steel material and a high-entropy and high-plasticizing method thereof, and belongs to the technical field of alloy steel preparation. Carbon steel alloy particles and cobalt-nickel-tungsten-molybdenum high-entropy alloy particles are used as raw materials, two-step smelting is carried out, homogeneous heat treatment is carried out, multiple cold rolling and heat treatment are carried out, and the high-strength and high-plasticity medium alloy steel material is obtained. And finally, the high-strength plastic medium alloy steel material is obtained. The method has the advantages of high component control precision, high process stability and high repeatability, and can realize the high-strength and high-plasticity performance of the medium alloy steel material. According to the medium alloy steel material prepared through the method, the high-entropy alloy serves as a reinforcing phase, the tensile yield strength is larger than or equal to 1.1 GPa, the tensile strength is larger than or equal to 1.3 GPa, the tensile deformation rate is larger than or equal to 37%, and the tensile yield strength at the temperature of 600 DEG C is larger than or equal to 750 MPa.

The vertical shaft derrick plastic energy dissipation protection beam structure disclosed by the application comprises a plastic energy dissipation component, a support component is fixed to the upper side of the plastic energy dissipation component through a plurality of bolts, a soft steel energy dissipation support is fixed to the two sides of the support component, the other sides of the two soft steel energy dissipation supports are fixed to steel columns, a plurality of buffer supports are further arranged, the buffer supports are fixed to the lower side of a steel beam, the steel beam is arranged above the support component, and the buffer supports correspond to the support component. The energy dissipation protection beam has the advantages of simple structure, convenient installation, wide application in the technical field of impact resistance protection in civil engineering and mechanical engineering, effective absorption and dissipation of impact energy, cooperation of multiple dissipation components and protection components, greatly improved energy dissipation capacity of the protection component, easy installation and replacement of the plastic energy dissipation components, low cost, and high protection efficiency.

The invention belongs to the technical field of aluminum alloy material processing, and discloses a cryogenic treatment process of a 7xxx series high-strength aluminum alloy pipe, the process sequentially comprises three core steps of solution treatment, cryogenic treatment and aging treatment, and the 7xxx series high-strength aluminum alloy pipe is obtained by accurately controlling key parameters of each step. The technical problems that in a traditional T6 heat treatment process, a 7xxx series aluminum alloy pipe is uneven in precipitated phase distribution, grain refinement is insufficient, the strength and plasticity are difficult to consider, and internal stress is large are solved. After being treated by the process, the tensile strength of the pipe is improved to 705MPa, the yield strength is improved to 678MPa, the ductility is improved to 11.8%, the size of a precipitated phase in a microstructure is smaller, distribution is more uniform, the internal stress is remarkably reduced, the size stability is greatly improved, industrial batch production can be realized, and the requirements of the fields of aerospace, rail transit and the like on the high-performance aluminum alloy pipe are met.

The invention discloses an anti-buckling steel plate shear wall restrained by string anti-bending components, which comprises an edge frame, a fishplate welded on the frame, an embedded steel plate fixed on the fishplate and the string anti-bending restraining components, and the restraining components are symmetrically arranged on the front side and the back side of the embedded steel plate. The supporting structure is composed of inhaul cable supports, constraint angle steel, inhaul cable supporting rods and pre-tensioning inhaul cables, out-of-plane buckling of a steel plate is limited through cooperative stress, and the lateral bearing capacity and the anti-seismic property are improved. The design of the slotted holes in the constraint component allows limited slippage in an earthquake, and a multi-stage anti-seismic mechanism is formed by combining elastic constraint of the inhaul cables and plastic energy dissipation of the steel plates. The lightweight design reduces the steel consumption, the prefabricated components are convenient to transport and rapidly install on site, the post-earthquake damage is concentrated on the replaceable steel plate, and the maintenance cost is low. The structure has the advantages of high rigidity, high energy consumption, convenience in assembly and environmental friendliness, and is suitable for high-rise buildings and high-intensity anti-seismic area projects.

The utility model relates to the field of inspection wells, in particular to an SMC (Sheet Molding Compound) glass fiber reinforced plastic energy dissipation well, which comprises a well seat, a shaft inserted at the top of the well seat, a water inlet arranged on one side of the shaft, a support ring fixedly arranged below the water inlet in the shaft, and a water falling grate mechanism arranged at the top of the support ring, a water receiving platform is fixedly installed on the side, close to the water inlet, of the top end of the water falling grate, an energy dissipation mechanism is in threaded connection with the top of the water receiving platform, and a water guide mechanism is vertically and upwards arranged on the side, close to the water inlet, of the top end of the water falling grate. In the utility model, the water flow at the water inlet is guided to the water falling grate mechanism through the water guide mechanism, and the water falling grate, the energy dissipation mechanism and the water receiving platform play a role in buffering and energy dissipation in the shaft, so that the water flow entering the shaft is prevented from directly impacting the bottom or the side wall of the well seat to generate noise; the water flow speed is dispersed and slowed down through the goose soft stone group and the water falling grate, and the water flow noise is reduced.

The invention relates to the field of metal material magnesium alloys, in particular to a preparation method of a high-plasticity magnesium alloy and a product thereof. The second phase of the grain boundary is controlled to be a quasi-crystal phase by regulating and controlling alloy components, and the preferred growth orientation surface of the magnesium alloy is regulated and controlled to be a conical surface through directional solidification, and the growth orientation is that grains are typical columnar crystals; the size and distribution of the second phase are adjusted by changing the growth speed, and segregation of the second phase in the crystal is reduced. And finally, the quasicrystal second phase is dispersed and distributed in the crystal by regulating and controlling the temperature and time of heat treatment. In this way, the high-plasticity magnesium alloy is successfully prepared, and the yield strength of the high-plasticity magnesium alloy ranges from 170 MPa to 200 MPa; the tensile strength is 180 to 212MPa, the plasticity reaches 31.0 to 42.2 percent, and the product of strength and elongation is 5580 to 8947MPa.%.

The present application relates to the technical field of aluminum alloy cast bar production, and particularly relates to an aluminum alloy cast bar production process based on micro-tube production, which solves the problem of simple refining process of molten aluminum in the prior art, reduces the plasticity and uniformity of the subsequent formed cast bar, and through the refining link, a composite refining system containing nano-Al2O3, carbon nanotubes and nano-TiB2 is innovatively adopted, combined with ultrasonic assisted slagging, nucleation is strengthened; during casting, three-stage composite cooling and titanium boron wire grain refinement are used to control the grain size to 50-100 mu m, significantly improve the uniformity; scientific homogenization treatment releases residual stress, improves the elongation of the cast bar and improves its subsequent plasticity; the cast bar is adapted to the high-precision extrusion demand of the micro-tube, is significantly superior to the traditional process, provides reliable blank for the stable production of high-precision micro-tube, and has extremely strong industrial application value.

The invention relates to a hot-rolled V-containing high-strength wire rod for 1860MPa bridge cables and a manufacturing method thereof. After rolling and spinning into a wire rod using a hypereutectoid component system of C‑Si‑Mn‑Cr‑V, the wire rod is subjected to an online molten salt isothermal weak tempering treatment, so that the wire rod first passes through a front-stage molten salt and is cooled at a cooling rate of ≥35°C / s, enters a sorbite phase region from an austenite state, and forms a structure mainly composed of sorbite. Then, the wire rod is heated through a rear-stage molten salt to promote isothermal tempering of the structure and melting of the sorbite lamellae. Finally, the wire rod is slowly cooled through a roller to form a mixed structure mainly composed of tempered sorbite and the rest of which is composed of ferrite and melted sorbite. The problems of network carbides and hard and brittle structures are improved, and the structure uniformity and strength-plasticity matching of large-size wire rods are improved. The tensile strength is 1340-1390MPa, and the cross-sectional shrinkage is 38%-43%. The wire rod can be used for manufacturing 1860MPa bridge cables and meets the requirements of wire making and torsion.

The application belongs to the technical field of structural engineering and relates to a damage deformation controllable composite column-concrete beam fabricated node and a mounting method, which comprises a steel pipe concrete composite column, a prefabricated concrete beam and a self-resetting energy dissipation structure. The surface of the composite column is provided with a connecting plate and a second hinged plate, and the end of the prefabricated concrete beam is provided with an H-shaped steel and a second hinged plate, which are hinged through a pin shaft. A friction energy dissipation component is arranged between the first and second hinged plates and is used for friction energy dissipation under small earthquakes. The two ends of a plastic energy dissipation plate and a super-elastic reset plate are respectively detachably connected with the connecting plate and the H-shaped steel and are respectively used for plastic energy dissipation under medium earthquakes and super-elastic reset after earthquakes. The node is cooperated with multi-stage energy dissipation and self-resetting, realizes no damage under small earthquakes, repairable under medium earthquakes and no collapse under large earthquakes, is easy to replace after earthquakes and is suitable for high-intensity region fabricated buildings.

The invention relates to a 1350MPa-grade high-strength tool steel wire rod and a manufacturing method thereof.The method includes the steps that after medium-high carbon chemical components of high Mn-Cr-V are designed, rolled and spun into a wire rod, the wire rod is subjected to online molten salt mixing quenching isothermal treatment, the wire rod is controlled to enter a sorbite phase region from a high-temperature austenite state at the cooling speed larger than or equal to 30 DEG C / s firstly, and then the wire rod is subjected to hot rolling treatment at the cooling speed larger than or equal to 30 DEG C / s; the method comprises the following steps: quenching a steel wire rod to form a quenched structure mainly comprising sorbite and retained austenite, carrying out isothermal tempering on the quenched structure to convert the retained austenite into martensite, toughening and destressing, and carrying out roller way slow cooling to prepare the steel wire rod with a microscopic structure comprising isothermal sorbite, tempered martensite and ferrite, so that the strength and plasticity matching of the steel wire rod can be improved, and the service life of the steel wire rod is prolonged. The tensile strength can reach 1230-1380 MPa, the percentage reduction of area is 36%-41%, the steel can be directly machined into parts after cold machining forming, and production energy consumption and cost reduction and efficiency improvement of the tool steel are facilitated.

The utility model discloses an aluminum-clad plastic energy-saving door and window magnetic attraction structure, and relates to the technical field of building doors and windows, the aluminum-clad plastic energy-saving door and window magnetic attraction structure comprises a frame profile and a sash profile, a fixed seat is fixedly connected to the position, close to the bottom, of the middle of the left side of the sash profile, and a frame magnetic mechanism is fixedly connected to the position, close to the right side, of the middle of the upper side of the frame profile in a sleeved mode. Buffer mechanisms are fixedly connected to the sides, close to each other, of the frame magnetic mechanism and the fixing seat, the frame magnetic mechanism comprises a frame magnetic attraction seat, the outer side of the frame magnetic attraction seat is fixedly connected to the position, close to the right side, of the middle of the upper side of the sash profile in a sleeving mode through screws, and an extension wall is fixedly connected to the position, close to the edge, of the right side of the frame magnetic attraction seat. According to the aluminum-coated plastic energy-saving door and window magnetic attraction structure, the upper side of the screw is limited through shielding of the sliding plate, so that the screw cannot move upwards, friction between the screw and a sash profile is avoided, and parts are protected.

The invention provides a projectile impact resistant titanium alloy plate and a preparation method and application thereof, and relates to the technical field of high-strength steel for armor protection, and the projectile impact resistant titanium alloy plate is formed by hot rolling compounding and heat treatment of at least one high-strength titanium alloy base plate and at least one energy-absorbing titanium alloy base plate, the high-strength titanium alloy base plates and the energy-absorbing titanium alloy base plates are alternately stacked; the high-strength titanium alloy base plate on the outermost side is a projectile body impact surface of the projectile body impact resistant titanium alloy plate; the thickness ratio of the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate adjacent to the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate is 1: (1-20); the impedance ratio of the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate adjacent to the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate is (1.025-1.25): 1. By compounding two materials with different impedances, controllable unloading of incident stress is achieved, peak stress is reduced through plastic energy absorption of the back plate, crack initiation is inhibited, and BFS is reduced.

The utility model provides a metal anti-falling beam buffer chain, which relates to the technical field of buffer chains, and comprises a buffer chain assembly and two embedded parts respectively connected with a pier and a beam body, the buffer chain assembly comprises an iron chain, a limit cap, a buffer rod, a disc spring and a steel cylinder, the buffer rod penetrates into the steel cylinder A and then penetrates into the disc spring, and the steel cylinder A is fixedly connected with the buffer rod. After the limiting block is screwed on the buffer rod, the buffer rod and the limiting cap B, the limiting cap A and the steel cylinder A, and the steel cylinder B and the steel cylinder A are connected into a whole through threads, the surface of the buffer rod is in sliding connection with the inner wall of the steel cylinder A, and the surface of the buffer rod is in sliding connection with the inner wall of the steel cylinder B. One end of the disc spring is fixedly connected with the inner wall of the steel cylinder A, and the other end of the disc spring is fixedly connected with the other end of the disc spring. According to the buffering chain, multi-stage fortification is adopted to prevent beam falling, all parts are made of metal materials, durability is good, elastic energy dissipation of the disc spring is achieved in the first stage, metal plastic energy dissipation is achieved in the second stage, rigid limiting is achieved in the third stage, and the disc spring is reset after an earthquake.

The invention belongs to the technical field of metal materials, and relates to a low-cost high-toughness corrosion-resistant casting medium-entropy alloy, the chemical formula of the alloy is FexCrNiAl < 0.37 > Ti < 0.37 >, and the value range of x is 3-6. The material is prepared through the processes of burdening, smelting, remelting, cooling curing and the like. The medium-entropy alloy provided by the invention has higher strength and better plasticity, and can meet the use requirements under complex stress conditions. And the stainless steel has excellent corrosion resistance, can show corrosion resistance comparable with that of stainless steel, and is suitable for corrosive environments such as ocean and chemical engineering. In addition, a complicated heat treatment process is not needed for secondary treatment, so that the operation steps are simplified, and the cost is reduced. And on the premise of ensuring the performance, a large amount of Fe element with relatively low price is used, so that the raw material cost of the alloy is greatly reduced, and popularization and application in the industrial field are facilitated.

The application relates to a light-weight capture and impact-reducing device suitable for an ultra-large bearing explosive bolt, which solves the problem of strong impact during capture and belongs to the technical field of spacecraft structures. The light-weight capture and impact-reducing device adopts a multi-configuration lattice structure and a special-shaped rubber pad, combines the viscoelastic deformation characteristics of rubber and the plastic energy-absorbing characteristics of a negative Poisson's ratio lattice energy-absorbing material, and realizes the capture and buffer impact reduction of a high-speed separated bolt body. The device has the advantages of good buffer effect, strong installation adaptability, light structure weight and the like.

This invention relates to a graded yielding energy dissipation connection device and its design method. The graded yielding energy dissipation connection device includes a fixed support, an upper beam, a lower beam, two steel columns, and a graded yielding energy dissipation device. The graded yielding energy dissipation device includes an X-shaped bending energy dissipation plate and an annular energy dissipation component. The annular energy dissipation component includes two sets of oppositely arranged round-end energy dissipation sections. Each round-end energy dissipation section includes an arc segment and a straight segment. An end plate is provided on the outer side of the straight segment, and the straight segment is connected to the end plate by high-strength bolts. The X-shaped bending energy dissipation plate is connected to the inner side of the two straight segments respectively, and its width changes linearly from the middle to both ends. Under minor earthquakes, the X-shaped bending energy dissipation plate dissipates energy by generating plastic deformation through out-of-plane bending. Under moderate earthquakes, the annular energy dissipation component dissipates energy by generating plastic deformation of the round-end energy dissipation section through the vertical displacement of the end plates on both sides. Under major earthquakes, the X-shaped bending energy dissipation plate and the annular energy dissipation component yield together and enter into plastic energy dissipation.

The invention discloses high-strength medium-chromium ferritic stainless steel which comprises the following chemical components in percentage by weight: less than or equal to 0.02% of C, less than or equal to 0.2% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.04% of P, less than or equal to 0.01% of S, 18.0-20.0% of Cr, 0.4-0.6% of Cu, 0.4-0.6% of Nb, less than or equal to 0.02% of N, 0.3-0.5% of W and the balance of Fe and inevitable impurity elements. The product obtained through component design has high strength and excellent plasticity in performance, and can meet the high-end requirements of the product industry.

The application discloses a kind of corrosion-resistant high plasticity titanium alloy foil for wide bipolar plate and its industrialized preparation method, in view of the high requirements of fuel cell bipolar plate to conductivity and corrosion resistance, using Ni, Nb, Cu micro-alloying design, improve the corrosion resistance and plasticity of material;Adopting three vacuum self-consumption smelting method, guarantee titanium alloy ingot composition uniformity, through hot rolling, cold rolling, degreasing pickling, annealing and other processes, obtain 0.08~0.15mm thickness specification titanium alloy foil.The titanium alloy foil has excellent seawater corrosion resistance and plasticity, can meet the forming requirement of processing thickness ≥0.08mm, and can adapt to the service environment of hydrogen fuel cell bipolar plate, can replace the stainless steel substrate used in the present stage bipolar plate, achieve the effect of weight reduction, improve the corrosion resistance of substrate, thereby greatly prolong the service life of battery, will effectively solve the bottleneck problems of current domestic proton exchange membrane battery substrate, such as poor comprehensive performance, high manufacturing cost.

The invention belongs to the technical field of seismic isolation of civil engineering structures, and particularly relates to an energy consumption type seismic isolation support with a memory function, which can remarkably improve the energy consumption performance of the support and effectively enhance the resistance to small earthquakes, wind loads and initial impact of large earthquakes. Meanwhile, by means of high initial rigidity and high horizontal bearing capacity, wind vibration and daily micro vibration can be well controlled, the comfort level and safety of the structure in the normal use state are improved, displacement of a shock insulation layer or a key floor can be remarkably reduced, pipelines and non-structural components of the shock insulation layer are protected, and under the action of a large earthquake, the shock insulation layer is prevented from being damaged. The damper can fully yield and enter a plastic energy dissipation state to become a main energy dissipation component, the protection function is further achieved, due to the fact that the damper can provide part of horizontal bearing capacity, rigidity and energy dissipation, the requirements for the shearing force borne by the support body and displacement are lowered, and the support with the smaller size, the lower cost or the lower performance requirement can be selected; and related cost is saved, and environmental pollution is reduced.

Method for determining a risk of the appearance of recrystallized grains during the manufacture of a mechanical part Method (1) for determining a risk of the appearance of recrystallized grains during the manufacture of a mechanical part by casting an alloy with a metallic component in a mold, the method (1) comprising the following steps: 1) a step (E1) implementing a mechanical test on a test piece so as to characterize an imposed plastic deformation of said test piece as a function of an imposed temperature; 2) a step (E2) implementing a heat treatment for resolving said test piece, said heat treatment for resolving being capable of creating the recrystallized grains;6) a step (E6) of comparing the value of the plastic deformation potential (Pε) or the value of the plastic energy potential (PE) calculated with a threshold value, the exceeding of which corresponds to the existence of a risk of the appearance of recrystallized grains in the test piece. Figure for the abstract: Fig. 1;

The invention belongs to the technical field of pipeline structure strength analysis and plastic energy absorption structure design, and particularly relates to a method for correcting plastic damage deformation of a pipeline. The invention provides a method for correcting plastic damage deformation of a pipeline, which comprises the following steps of: further dividing a partial region into a rigid section and a residual plastic region, and continuously correcting the size of the rigid section through comparison before and after curvature to obtain a force-displacement response curve; and finally, through a finite element verification method combining a J2 plastic deformation full-amount constitutive model considering a large deformation effect and a rigid region judgment step under a one-time unloading hypothesis, and a compilation method of a corresponding Abaqus user-defined subprogram UMAT, accurate calculation of a crushing global force-displacement response curve of the cross section of the pipeline on an upper flat plate and a lower flat plate can be realized, and the accuracy of the pipeline cross section is improved. And safety evaluation and damage evaluation of the pipeline structure are realized.

The utility model is suitable for the field of humidifiers, and discloses a humidifier energy gathering ring and an upper water adding humidifier comprising the humidifier energy gathering ring. The humidifier energy gathering ring comprises a first floating plate, a second floating plate, an energy gathering column and a movable column, wherein the first floating plate and the second floating plate are vertically arranged in parallel, the energy gathering column is arranged between the first floating plate and the second floating plate, and the movable column is arranged between the first floating plate and the second floating plate. An energy gathering channel is formed in the energy gathering column; the energy gathering channel comprises a conical cavity, a cylindrical cavity and an inverted conical cavity which are sequentially connected from top to bottom; a through hole is formed in the movable column; the energy gathering column extends downwards to the position below the second floating plate. The energy-gathering column extends downwards to the position below the second floating plate, when the water level in the water tank is low, the lower side of the energy-gathering column is soaked in water all the time, and therefore heat dissipation can still be conducted on the energy-gathering column through the water in the water tank, the energy-gathering ring made of plastic materials is prevented from being burnt and melted, and the service life of the energy-gathering ring is prolonged. And electrical safety accidents caused by melting of the energy-gathering ring are not easy to occur.

The invention discloses an asphalt modifier, a preparation method thereof, modified asphalt and a preparation method and application thereof. The asphalt modifier comprises a base polymer, a flexibilizer, a compatilizer, a reinforcing agent, an anti-aging agent and a stabilizer, wherein the base polymer is SBS, and the flexibilizer is a mixture of SEBS and POE. The preparation method comprises the following steps: premixing, carrying out melt blending, adding the reinforcing agent, the anti-aging agent and the stabilizer in a molten state, uniformly mixing, extruding, cooling and pelletizing to obtain the granular modifier. The modified asphalt is prepared by adding the asphalt modifier accounting for 3-8% of the weight of the base asphalt into the matrix asphalt, heating, shearing and mixing. According to the system, through a synergistic toughening mechanism of elastic recovery and plastic energy consumption and comprehensive design of reinforcement, aging resistance and cross-linking stability, the modified asphalt has excellent low-temperature ductility, fracture toughness and fatigue life, the high-temperature softening point and storage stability are remarkably improved, and the modified asphalt is suitable for road pavement engineering in heavy-load and high-temperature severe cold areas.

The invention provides a multi-stage energy consumption prefabricated UHPC anti-collision wall and an assembling method thereof, and relates to the technical field of bridge engineering. Comprising a UHPC framework arranged at the bottom, a first U-shaped embedded steel bar, a second U-shaped embedded steel bar and an energy consumption connecting piece. The first U-shaped embedded steel bar is connected with the top wall of the reserved shear groove, the second U-shaped embedded steel bar is connected with the bridge deck platform, and a pouring hole communicated with the reserved shear groove is formed in the UHPC framework; and the UHPC framework is connected with the bridge deck platform through the energy consumption connecting piece. A specific multi-stage energy dissipation mechanism is jointly formed by energy dissipation connecting pieces, plastic energy dissipation materials and a post-pouring connecting structure composed of reserved shear force grooves and U-shaped embedded steel bars, and the plastic energy dissipation materials serve as first-stage energy dissipation and absorb initial impact energy through compression deformation; the energy dissipation connecting piece is used for second-stage energy dissipation, and main energy is dissipated through elasticoplastic deformation of the elliptical annular connecting piece; the reserved shear grooves formed by pouring and solidifying the ultra-high performance concrete and the U-shaped embedded steel bars in the reserved shear grooves serve as third-stage energy dissipation, and the final integrity and residual strength guarantee is provided.

The invention relates to a self-resetting energy dissipation connector of a rotary external wall panel. The self-resetting energy dissipation connector comprises a frame structure composed of frame beams and frame columns. Each frame structure is provided with a plurality of externally-hung wall plates, the upper portions of the externally-hung wall plates are connected with the upper frame beams through non-bearing type nodes, the lower portions of the externally-hung wall plates are connected with the lower frame beams through bearing type nodes, and the adjacent externally-hung wall plates are connected through energy dissipation steel plates. The non-bearing node comprises a second fixing steel plate assembly, a second bolt and the like, a long round hole is formed in the second fixing steel plate assembly, and the bolt is allowed to relatively slide in the direction of the long round hole under the earthquake action; the bearing type joint comprises a first fixing steel plate assembly, a first bolt, a belleville spring assembly and the like. Through the synergistic effect of wall plate rotation, plastic energy consumption, elastic reset and other mechanisms, on the premise that an additional supporting structure is not added, damage and residual deformation of the frame structure and the externally-hung wall plate under the earthquake effect are effectively reduced, and the anti-seismic toughness of connection of the externally-hung wall plate is remarkably improved.

The present invention discloses a beam-column node with a replaceable low-yield point energy-absorbing truss. Existing steel frame beam-column ductile nodes do not take into account the rapid repairability after damage. The present invention includes frame beams and frame columns and ear plates located at the joints of the frame beams and frame columns. The upper and lower flanges of the frame beams are respectively provided with energy-absorbing trusses. The energy-absorbing truss is a square hollow structure composed of two horizontal plates and two vertical plates. A plurality of fuse plates are obliquely arranged in the square hollow structure, and two adjacent fuse plates form a triangle with the horizontal plate. The fuse plate of the present invention has a hole in the middle and is weakened at the edge. When the node is damaged, the energy-absorbing truss first enters plastic energy absorption and then is destroyed, thereby achieving the purpose of protecting permanent components. The energy-absorbing truss is easy to disassemble and replace after the earthquake, realizing the possibility and convenience of post-earthquake repair.

The invention discloses a heat treatment method for electric arc fuse wire additive manufacturing of Mg-Nd-Zn-Zr series magnesium alloy. The method comprises the steps that firstly, an Mg-Nd-Zn-Zr series magnesium alloy deposition part is obtained through electric arc fuse wire additive manufacturing; secondly, the Mg-Nd-Zn-Zr series magnesium alloy deposition part is subjected to solution treatment; and thirdly, the solid solution state Mg-Nd-Zn-Zr series magnesium alloy deposition piece is subjected to two-stage aging treatment, and the high-strength and high-plasticity Mg-Nd-Zn-Zr series magnesium alloy is obtained. The solid solution and two-stage aging heat treatment process is adopted, the residual internal stress and structure defects in the electric arc fuse wire additive manufacturing Mg-Nd-Zn-Zr series magnesium alloy are effectively eliminated, the grain shape and size are regulated and controlled, uniform dispersion and precipitation of a strengthening phase are promoted, the Mg-Nd-Zn-Zr series magnesium alloy with the uniform and compact structure and the high-strength and high-plasticity performance is obtained, and the high-strength and high-plasticity Mg-Nd-Zn-Zr series magnesium alloy is obtained. The method is suitable for the fields of aerospace, national defense and military industry and medical treatment.