934 results about "Large deformation" patented technology

The embodiment of the invention relates to the technical field of data modeling analysis, and discloses a tunnel rock stratum large deformation analysis method and system based on three-dimensional modeling, and the method comprises the steps: collecting initial three-dimensional point cloud data through three-dimensional laser scanning; constructing an initial three-dimensional geologic model containing spatial morphological characteristics and a rock stratum interface geometric topological relation through space coordinate matching and curved surface reconstruction; finite element unstructured mesh generation is carried out on the model, and a rock stratum mechanical analysis model is established in combination with physical and mechanical parameters; inputting construction parameters and process information, activating unit nodes in sequence, and solving a force balance equation to simulate stress distribution; identifying a potential deformation area through iterative calculation, and adjusting boundary conditions to predict a deformation trend; the three-dimensional space distribution cloud atlas, the time evolution curve and the position marks are fused to generate multi-view deformation early warning information, the accuracy and the visualization degree of tunnel rock stratum deformation analysis are improved, and support is provided for construction safety.

The invention relates to the field of constructional engineering, in particular to a selection method for a hoisting system of a steel box girder and related products, and the selection method comprises the steps that a parameterized mechanical model is established according to parameters of the hoisting system, and hoisting point positions are variable parameters; the hoisting system comprises a steel box girder and a sling; based on the parameterized mechanical model, carrying out stress analysis in the hoisting process, and calculating the stress conditions of the sling and the steel box girder; by taking minimization of the maximum stress of the sling, the maximum stress of the steel box girder or the maximum deformation in the hoisting process as an optimization target, determining an optimal hoisting point position and matched sling parameters by utilizing an optimization algorithm; according to the method, by establishing the parameterized mechanical model of the hoisting system and carrying out nonlinear finite element analysis in the hoisting process, the sling stress, the steel box girder stress and the system deformation under different hoisting point positions and sling parameter combinations can be accurately calculated.

The invention discloses a deep underground engineering large deformation real-time monitoring and control method based on deep learning. The method comprises the steps of deployment of a monitoring system, preprocessing of monitoring data, construction of a neural network model, training of the neural network model, output of a prediction result, generation of a control instruction and quantitative evaluation of a control effect. According to synchronously acquired multi-source information such as surrounding rock strain, temperature, seepage pressure and micro-seismic disturbance energy, a deep learning model based on physical mechanism constraint is introduced, so that the reliability and generalization ability of a prediction result are remarkably improved; intelligent identification of surrounding rock stability assessment and failure modes is realized, a control instruction is automatically generated, and an implementation effect is quantitatively assessed.

The invention relates to a free forging method for preparing an AAA nondestructive inspection grade large-specification TC4 alloy bar, and belongs to the technical field of titanium alloy hot working. According to the method, as-cast grains are fully crushed and refined through high-temperature and large-deformation forging in the cogging stage; high-low-high heating forging at the lower phase transformation point and the upper phase transformation point is used for promoting the high-temperature dynamic recrystallization process so as to homogenize crystal grains; the corner deformation dead zone is fully reduced through multi-heating-number diagonal drawing-out forging, and a U-shaped anvil is adopted in the forming stage to reduce metal flowing in all directions in the rolling stage. According to the free forging method for the large-specification TC4 alloy bar, the structure uniformity of the TC4 alloy bar can be improved, and the AAA-level nondestructive testing requirement is met.

The invention provides a reproduction lifting and diving test device, and belongs to the technical field of mechanical control. The problems that a guide rail needs to bear large lateral force for achieving the working conditions of large load mass, large reproduction acceleration and long stroke of existing equipment, and particularly when the stroke is large, the lateral force enables the guide rail to deform greatly are solved. The device comprises lifting actuator assemblies, a cross beam assembly, a motion platform, stand columns, a base and a moment balance assembly, the stand columns are installed at the four corners of the lower end face of the cross beam assembly, the bottoms of the stand columns are connected with the base, the motion platform is installed on the stand columns in a sliding mode, and the four lifting actuator assemblies penetrate through the cross beam assembly to be connected with the motion platform; a moment balance assembly is installed at the joint of the motion platform and the stand column, and an energy accumulator assembly used for supplying energy to the lifting actuator assembly is installed on the cross beam assembly. The device is mainly used for testing the working conditions of large load mass, large reproduction acceleration and long stroke.

The invention belongs to the technical field of weak compressible large deformation of soft materials, provides a dynamic analysis explicit substance point method for large deformation of weak compressible materials, and provides a brand new numerical calculation method for large deformation research of the weak compressible materials. According to the method, a weak-form control equation is discretized in a total Lagrangian substance point method framework, and challenges caused by grid distortion when a traditional method is used for solving a large deformation problem are avoided. Besides, the invention provides a volume self-locking processing technology based on an F-bar method, the problem of volume locking of the weakly compressible substance in numerical simulation can be simply, conveniently and effectively solved, and the volume self-locking processing technology can be conveniently embedded into an existing substance point method program. Meanwhile, a construction method of a smooth kernel interpolation function is developed, and the problem that the solving precision of a traditional substance point method in a boundary region is reduced can be effectively solved. According to the method, the problem of large deformation of the weak compressible material can be solved in a stable and efficient manner, and a new technical path is provided for research and application in related fields.

The invention discloses a deep underground engineering large deformation prevention and control method and system, and relates to the field of underground engineering safety prevention and control, and the method comprises the following steps: arranging a displacement sensor in an underground engineering structure, and obtaining a displacement time sequence; carrying out normalization processing on the displacement time sequence; extracting a displacement change rate sequence of each monitoring point in each time window; taking the displacement change rate sequence of each monitoring point as a feature vector, and performing trend clustering on the monitoring points by adopting a clustering algorithm based on time sequence similarity to obtain a plurality of trend clustering class clusters; and when the number of the monitoring points contained in a certain trend clustering class cluster exceeds a preset proportion threshold value of the total point number and the average displacement change rate of the monitoring points continuously rises in the current time window, identifying an area corresponding to the class cluster as a trend abnormal accumulation area, and outputting early warning information of the area. According to the invention, the problems that the traditional threshold alarm cannot identify the tiny cooperative deformation precursor and the rate of missed alarm and false alarm is high are solved.

The invention discloses a tunnel construction method for a large deformation section of soft rock, and relates to the technical field of tunnel construction for the large deformation section of the soft rock, and the tunnel construction method for the large deformation section of the soft rock comprises the following steps: drilling shallow large-aperture stress release holes and deep small-aperture stress release holes to form a layered release system; differential pressure grouting is conducted around the stress release holes, and a deep reinforcing ring and a shallow coupling ring are formed; a steel frame is erected, and a three-stage stretching locking bottom supporting assembly is installed to form a closed supporting ring; the bottoms of the adjacent steel frames are crossly connected through prestressed pull rods to form an integral rigid grid; a secondary lining is constructed after the longitudinal attenuation conduction period is judged according to the surrounding rock deformation spatial-temporal characteristics; inverted arch first and then arch wall segmented pouring is adopted, and a delayed expanding agent is doped into arch wall concrete. The method can effectively control surrounding rock deformation in the tunnel construction process of the large deformation section of the soft rock, improves the overall rigidity and stability of a supporting system, ensures that the lining is tightly attached to the surrounding rock, and reduces the construction risk.

The invention provides a deep vertical shaft soft rock large deformation comprehensive index evaluation method comprising the following steps: carrying out geological environment analysis on a target area to obtain large deformation influence factors; calculating a large deformation evaluation index according to the large deformation influence factor; constructing a large deformation case database and a machine learning model, and performing risk prediction on the large deformation case database through the machine learning model to obtain a prediction result; dividing the soft rock large deformation grade according to the prediction result and the large deformation evaluation index; and executing different supporting schemes according to the soft rock large deformation grade. According to the method, the rock mass quality grading system is established through the multi-dimensional data and the large deformation evaluation indexes, meanwhile, the soft rock large deformation grade is divided according to the prediction result of the machine learning model on the large deformation case database, the soft rock large deformation prediction precision and the support design scientificity are improved, and the safety and efficiency of the deep vertical shaft project are guaranteed.

The invention relates to the field of railway tunnel construction, in particular to an unsymmetrical soft rock large-deformation tunnel supporting structure system and a construction method thereof. Comprising the steps of 1, establishing a primary support deformation database; 2, selecting different positions to reserve deformation characteristic values; thirdly, a primary support section is independently designed; fourthly, primary support construction is independently designed; step 5, performing section construction at the initial stage of the original design; sixthly, compensation grouting is conducted; and seventhly, secondary lining construction is conducted, the first step to the seventh step are repeated for multiple times, and the large deformation section of the soft rock is biased. The problem of repeated arch changing treatment of the soft rock bias tunnel can be prevented and reduced, the situation that when the tunnel primary support deforms, the whole section is synchronously enlarged, and secondary lining concrete in part of a section is seriously overconsumed is avoided, the construction efficiency is improved, and the cost is saved.

An electrically-assisted tooth-shaped rolling process and device for preparing a gradient ultrafine-grained sheet is provided. A rib-forming pressure roller, a rib-flatting pressure roller and a straightening pressure roller are adopted to sequentially roll relative to a surface of a sheet under a preset pressing force. The surface of the sheet is driven, under a rib forming process, to generate large deformation in micro-area to crush and refine grains, and under a rib flatting process to generate reverse large deformation in micro-area. Large deformation areas in the rib forming process and the rib flatting process are staggered to further crush and refine the grains. A cold straightening process drives the sheet to be restored to an original shape, so that the sheet becomes the gradient ultrafine-grained sheet with a decreasing grain size gradient from an interior to a surface layer.

The invention discloses an invasion limit surrounding rock excavation method for a large deformation section of soft rock, and relates to the technical field of invasion limit surrounding rock excavation construction for the large deformation section of the soft rock. The invasion limit surrounding rock excavation method for the large deformation section of the soft rock comprises the steps that refined partitioning of an invasion limit body is achieved through dense scanning and loose circle testing; dividing the invasion limiting body into a core pressure-bearing area and a peripheral stress relaxation area; a main stress diversion arch crossing an invasion limit section is constructed through full-ring radial grouting reinforcement and erection of a strong profile steel temporary cover arch, and effective stress transfer is achieved; the mode of subarea gradual type dismantling and chiseling and instant supporting is adopted, a peripheral stress relaxation area is treated firstly, then a core pressure-bearing area is treated, and surrounding rock disturbance is reduced; the circumferential stress equalization is realized by compensating grouting in stages and dynamically adjusting the grouting pressure according to real-time monitoring data. According to the method, the excavation construction safety of the invasion limit surrounding rock of the large deformation section of the soft rock can be improved, surrounding rock disturbance is reduced, stress distribution is optimized, and the treatment efficiency of the invasion limit surrounding rock is improved.

The invention relates to the technical field of metal additive manufacturing, in particular to a discontinuous dot matrix supporting structure design method for restraining additive manufacturing thermal deformation, and the method comprises the steps that a missile wing discontinuous dot matrix filling area is determined, and the design density of the filling area and the appearance precision index of missile wing additive manufacturing are determined; determining an L-D curve of the unit cell size and the unit cell diameter of the filling area; constructing a three-dimensional geometric model of the missile wing structure on the basis of an L-D curve, performing additive manufacturing thermal deformation analysis, and determining a spacing interval of a body-centered cubic dot matrix by combining the difference between the maximum deformation of the feature points on the outer surface of the missile wing and the appearance precision index of the additive manufacturing of the missile wing; and obtaining the optimal discontinuous spacing according to the spacing interval of the body-centered cubic dot matrix. Through the size design and the spacing design of the discontinuous dot matrix structure, the discontinuous dot matrix supporting structure meeting the missile wing appearance precision requirement and the lightweight requirement is obtained.

The invention belongs to the technical field of underground engineering supporting, and particularly discloses a shear-resistant variable-resistance yielding anchor rod capable of measuring pretightening force and a using method thereof.The shear-resistant variable-resistance yielding anchor rod is provided with an anchor rod body, the anchor rod body comprises a head section, a middle standard section and a tail section which are sequentially connected, the head section comprises a head end rod body, the head end rod body is provided with a piston head, and the piston head is sleeved with a sleeve; the sleeve and the piston head form a piston structure. A piston cylinder structure is arranged on the middle standard section and is used for adapting to shear deformation caused by dislocation and slippage deformation of a rock stratum. The tail section comprises a first rod body and a second rod body, the tail end of the second rod body is arranged in the first rod body in a penetrating mode along the rod length of the first rod body, connected with the elastic piece and capable of sliding in the rod length direction of the first rod body, and the tail end of the second rod body is provided with an outer extension and capable of feeding back deformation of the elastic piece. The problem that a common anchor rod cannot meet the requirement for large deformation of surrounding rock is solved, the problem that an existing anchor rod is prone to being cut off under transverse displacement of a rock stratum is solved, and meanwhile the pretightening force can be measured.

The invention discloses a soft rock waterproof layer construction method for a soft rock large-deformation section tunnel, and relates to the technical field of soft rock waterproof layer construction of the soft rock large-deformation section tunnel. The construction method of the soft rock waterproof layer for the tunnel at the large deformation section of the soft rock comprises the steps that a sprayed concrete layer is constructed, a full-ring-shaped steel arch frame is erected, system anchor rods are constructed, concrete is sprayed again after full-length grouting is conducted, and a primary supporting layer containing a grouting reinforcing ring is formed; locking anchor pipe grouting is carried out on the arch springing part to form a local reinforced waterproof bearing body; based on deformation monitoring data, dynamic judgment is carried out, and radial reinforcing grouting is carried out on the obvious deformation part; and after deformation is stable, a waterproof layer is laid, a secondary lining is poured, and a composite waterproof system is formed. The waterproof reliability and the structural durability of the soft rock waterproof layer of the tunnel at the large deformation section of the soft rock can be improved.

The present invention provides a method for predicting deformation of plate butt welds based on an inherent strain method. The method comprises: providing a group of plates of the same material with different thicknesses, establishing a welding deformation prediction model based on the plates; obtaining the plate thicknesses, and using the deformation prediction model to obtain the shrinkage of plates of different thicknesses, thereby establishing a curve relationship diagram of the shrinkage and plate thickness under unit inherent strain and regional width; and calculating the shrinkage angle of the plate butt welds based on the curve relationship diagram to determine the maximum deformation of the plate shrinkage. By calculating the shrinkage angle of the plate butt welds based on the curve relationship diagram to determine the maximum deformation of the plate shrinkage, the present invention enables technicians to approximately calculate and predict the maximum deformation of the plate shrinkage caused by welding deformation through the prediction method of the present invention, thereby quickly guiding work in the design and production stages.

The invention provides a soft rock roadway large deformation control method, and relates to the technical field of soft rock roadway supporting, and the method comprises the following steps: carrying out a crustal stress test, obtaining a crustal stress distribution rule of a roadway area, and analyzing the relationship between roadway arrangement and a crustal stress field, and the influence of crustal stress on roadway surrounding rock stress distribution; based on a ground stress test result, an anchor net cable, sprayed concrete, U-shaped shed and inverted arch active support system is constructed; according to the method, a series of stress tests and other studies are carried out, a series of relations between crustal stress distribution rules and a coal rock mass structure are obtained, an original passive supporting mode of anchor net and shed erecting is adjusted into active supporting of anchor net cable, concrete spraying, U-shaped shed and inverted arch, efficient cooperative control among different supporting measures is achieved, and the supporting effect is good. The supporting system and the supporting characteristic curve are adapted and matched with the deformation activity state of the surrounding rock, the self-bearing capacity of the surrounding rock and the supporting capacity of the supporting system are exerted to the maximum extent, and the purpose of maintaining the stability of a roadway is achieved.

The invention relates to the field of TBM construction, in particular to a construction method for pre-stressed anchoring of a shield type TBM penetrating through a soft rock cave section, which is a construction method for performing active supporting by taking a pre-stress measure as a core on the basis of passive supporting of a duct piece, and construction of a pre-stressed anchor rod is rapidly completed while TBM tunneling is ensured. And the slab staggering and damage risks caused by large deformation of soft rock and the risk of subsequent repair of the formed segment are reduced, the construction quality of the TBM penetrating through the high-ground-stress soft rock cave section is guaranteed, the advantage of the shield type TBM penetrating through complex stratums such as weak and broken stratums is greatly played, and high popularization performance is achieved. Therefore, the technical problems that in the relatively limited in-hole operation space and the existing duct piece supporting construction process, deformation of the duct piece and clamping of a rear supporting machine of the TBM are prevented can be solved, and the purpose of performing active supporting measures on the later-period deformed surrounding rock for construction is achieved.

The present invention belongs to the field of railway technology, and discloses a slab ballastless track and adjustment method that adapts to foundation deformation, comprising: a base, on which a limiting boss is cast; a prefabricated track plate, a long rectangular hole opened in the middle, and two limiting bosses embedded on both sides of the corresponding long rectangular hole; a cover plate, which covers the long rectangular hole; a stacked height adjustment layer, which is pressed between the base and the prefabricated track plate; a filling adjustment layer, which is pressed between the base and the height adjustment layer; a horizontal adjustment layer, which is pressed between the limiting boss and the long rectangular hole; and a plurality of anti-movement limiting plates, which are installed on two opposite side walls of the prefabricated track plate to prevent the height adjustment layer from moving out laterally. The present invention solves the problem of insufficient deformation adjustment capacity of existing ballastless tracks when the offline foundation undergoes large deformation, and can be applied to the construction of ballastless tracks in complex geological sections and the treatment of defects caused by foundation deformation of operating lines.

According to the low-strength high-formability austenitic stainless steel and the manufacturing method thereof, C + N is controlled to be smaller than or equal to 0.035%, the manganese content is controlled to be within 1.5%, the tin content is limited to be 0.01%-0.30%, the copper content is limited to be 2.4%-4.5%, and the tin-copper ratio is that (Sn / Cu) * 1000 is larger than or equal to 5 and smaller than or equal to 50, so that it is guaranteed that tin exerts the beneficial effects such as the corrosion resistance is improved, and the harm of tin segregation can be controlled to be at the low level; according to the finally obtained austenitic stainless steel, the yield strength is smaller than or equal to 160 Mpa, the tensile strength is smaller than or equal to 500 Mpa, the ductility is larger than or equal to 55%, the grain size grade is 6-8, edge cracks cannot occur during hot rolling, the martensite content of a cup drawing deformation part is 0.05% or below during large deformation machining, in other words, the austenite phase is still stable under the complex deformation condition, deformation cracks are avoided, and the service life of the austenitic stainless steel is prolonged. The comprehensive effects of high corrosion resistance, low strength and high forming machinability of the material are achieved.

To provide a copper alloy excellent in conductivity while having a sufficiently large elastic deformation amount with a low Young's modulus and unlikely to cause a plastic deformation even under a large deformation.SOLUTION: A copper alloy has a composition including 15-57 mass% Zn, 12 mass% or less Al, satisfying A+5×B≥30 and A+3.5×B≤57 in which the Zn content is A mass% and the Al content is B mass%, and a balance Cu with inevitable impurities. A volume fraction in a β phase is 50% or more. an average of KAM (Kernel Average Misorientation) values of the β phase is 2.0° or less obtained when a measurement area of 1 mm2 or more is measured at a measurement interval 1 μm step by an EBSD method and measured excluding a measurement point with a CI value of 0.1 or less analyzed by data analysis software OIM.SELECTED DRAWING: None

To provide a copper alloy excellent in conductivity while having a sufficiently large elastic deformation amount with a low Young's modulus and unlikely to cause a plastic deformation even under a large deformation.SOLUTION: A copper alloy has a composition including 15-57 mass% Zn, 12 mass% or less Al, satisfying A+5×B≥30 and A+3.5×B≤57 in which the Zn content is A mass% and the Al content is B mass%, and a balance Cu with inevitable impurities. A volume fraction in a β phase is 50% or more. When a measurement area of 8 mm2 or more is measured at a measurement interval 8 μm step by an EBSD method and analyzed excluding a measurement point with a CI value of 0.1 or less obtained through an analysis by data analysis software OIM, and an interval between measurement points in which an orientation difference between neighboring measurement points is 5° or more is regarded as a crystal grain boundary, a ratio of each coincidence boundary length of 3≤Σ≤29 to all crystal grain boundary lengths L at which measured β phases are abutting with each other is 4% or more.SELECTED DRAWING: None

The invention belongs to the field of hydraulic engineering, and discloses a physical information network-based intelligent optimization method and system for a three-dimensional structure design of a long-distance water delivery tunnel lining, and the method comprises the steps: S1, building a three-dimensional geometric model of the long-distance water delivery tunnel lining; s2, establishing a structural mechanical analysis physical model considering surrounding rock stress and a construction excavation process; s3, establishing a multi-parameter physical information network model and performing training; and S4, the lining bearing capacity, the maximum deformation and the crack width serve as constraint boundaries, the engineering cost serves as an optimization target, a set of lining structure design parameters is obtained through optimization, and the lining structure design parameters comprise tunnel shape parameters, lining thickness and construction supporting parameters. The method is simple and practical, the lining bearing capacity, the maximum deformation and the crack width can be efficiently and accurately analyzed and calculated according to existing data, inversion optimization of lining structure design parameters is achieved, and the optimal design parameter set is obtained.

The invention discloses an elongation-controllable pre-stressed anchor cable, supporting equipment and a supporting method.The elongation-controllable pre-stressed anchor cable comprises a screw rod, a tray, a taper sleeve, a connecting pipe and a shaft sleeve, the upper end of the connecting pipe is connected with a connecting sleeve II, the lower end of the connecting pipe is connected with a connecting sleeve I, the connecting sleeve I is connected with the screw rod, the tray is installed on the screw rod, and a taper hole is formed in the lower end of the connecting pipe; the upper end of the shaft sleeve is provided with a counter bore used for installing a steel strand, and the lower end of the shaft sleeve penetrates through the connecting sleeve II and the connecting pipe and then is connected with the taper sleeve. The screw rod, the connecting sleeve I, the connecting pipe and the connecting sleeve II are connected into a whole, the taper sleeve and the shaft sleeve are connected into a whole, and when rock mass changes, the taper sleeve and the shaft sleeve slide along the inner wall of the connecting pipe together. When large deformation of surrounding rock occurs, the length of the anchor cable is automatically prolonged through a sliding mechanism between the shaft sleeve and the connecting pipe, the anchor cable is prevented from being broken due to excessive stretching, and the problem that the anchor cable is broken due to large deformation of the surrounding rock of a roadway can be effectively solved.

The invention discloses a steel beam digital assembly hole deviation threshold value calculation method, device and equipment, and the method comprises the steps: calculating a theoretical deformation function model between the axial deformation and bending deformation of a chord member through the length, width and height of a chord member cantilever section of a sub-girder section, the allowable stress of a splice plate, and an angle between a resultant force and a design central axis; then, finite element analysis is conducted on the sub truss sections under different applied forces, and scatter diagrams of tensile deformation and bending deformation are obtained; then the theoretical deformation function model is corrected by using a scatter diagram to obtain a splicing hole deviation threshold value line function image of steel beam digital splicing, so that the problem of inaccuracy caused by neglecting factors of splice plates in practical application in traditional digital analysis is avoided; the maximum deformation threshold value of the chord member, namely the line function image of the deviation threshold value of the splicing hole, is calculated through simulation, and accurate guidance is provided for digital girder section splicing, so that the bridge construction process is optimized, and the construction precision and efficiency are improved.

The invention discloses a GH738 alloy bar large-deformation semi-continuous efficient rolling device and technology. The requirements for the grain size and the durability are met at the same time by optimizing the heating and deformation technology in the semi-continuous rolling process. A large-deformation semi-continuous efficient rolling device and a corresponding process are adopted, wherein the large-deformation rolling is 50%-80%; heat is supplemented in the rolling process, and the blank temperature is increased; the finish rolling temperature is increased; and the rolled blank is rapidly heated by an induction coil, and hot straightening is carried out. The method disclosed by the invention has the beneficial effects that (1) the mode of large deformation and heat compensation by using a heating furnace midway is adopted, and the standard grain size requirement of grade 3-grade 6 is met; (2) the rolled blank is heated through an induction coil to be rapidly heated, hot straightening is carried out, and the roundness and the size of the bar are improved; and after standard heat treatment, a surface stress layer cannot be generated due to straightening, so that a coarse-grain ring cannot be generated.

The invention discloses a high-efficiency and low-cost TC4 titanium alloy fine-grain rod preparation method, which comprises the following steps of: accurately controlling the structure evolution in the hot working process of a rod material in a manner of replacing forging with rolling and combining forging and rolling, and carrying out cast ingot cogging forging for three heating numbers and low-temperature low-speed large-deformation rolling forming for four heating numbers, so as to obtain the high-efficiency and low-cost TC4 titanium alloy fine-grain rod. And finally, the TC4 titanium alloy fine-grain rod which is uniform and fine in structure and excellent in performance is obtained. The TC4 titanium alloy fine-grain bar prepared by the method reaches a leading level in the aspect of transverse and longitudinal structure uniformity and refinement. According to the preparation method, the difficulty in formulation of a forging and rolling combined process and the difficulty in structure regulation and control are broken through, the heating number of the preparation process is reduced from about 20 of a traditional radial forging process to 4 of rolling, and the preparation method of the TC4 titanium alloy fine-grain bar is efficient and low in cost.

The invention discloses a multiphase alloy plastic constitutive model and a modeling method.The modeling method of the multiphase alloy plastic constitutive model comprises the steps that dynamic stress-strain data at different temperatures are obtained by designing a Hopkinson pressure bar experiment, and a JC-TANH constitutive model considering the flow softening effect is adopted; the model parameters are fitted and verified on the basis of experimental data, a data set under a large deformation condition is constructed, parameter determination is performed on the established plastic stress constitutive model on the basis of the data set, and finally construction of the alloy plastic constitutive model considering the dynamic recrystallization effect is completed. The model not only describes the influence of phase change on the material performance, but also can reflect the material softening caused by dynamic recrystallization, and the method provides guidance for the material modeling method considering the microstructure effect, and is of great significance for deeply revealing the microcosmic nature of the deformation and removal mechanism of the cutting material.

The invention relates to an AI-based steel structure lifting point intelligent arrangement method, which belongs to the technical field of steel structure building construction, and comprises the following operation steps: 1, establishing a multi-data-source steel structure lifting point AI model; and 2, carrying out AI steel structure lifting point intelligent design. And 3, designing and constructing integrated intelligent arrangement by adopting steel structure lifting points of AI. Fourthly, the maximum lifting deformation and the maximum stress ratio are judged, and local precision control is conducted on the deviation between the actual deformation and stress of the butt joint position of the (i + 1) th lifted steel structure and the theoretical value of the AI model; and detecting the overall actual maximum deformation and stress of the first i + 1 lifted steel structures after hoisting, and carrying out overall precision control. The AI model, numerical simulation and an intelligent algorithm are combined, and the butt joint precision of steel structure lifting installation is improved. The problem of insufficient consideration of butt joint precision and field construction factors is solved. The safety of steel structure lifting point arrangement is improved, and meanwhile real-time feedback adjustment of steel structure lifting point arrangement is achieved.

The invention discloses a TA4-xB alloy and a preparation method thereof, the content of B in the alloy is 0.01-0.5 wt%, and the balance is Ti and other impurities. The preparation method comprises the following steps: dividing sponge titanium and TiB2 wrapped by pure titanium foil into three equal parts, smelting in three times by adopting a vacuum non-consumable arc smelting furnace to obtain three button ingots, then putting the three button ingots into the smelting furnace for secondary smelting to obtain an alloy ingot, and finally overturning and repeatedly smelting the alloy ingot obtained by cooling after secondary smelting for three times. A TA4-xB alloy cast ingot with uniform components is obtained through smelting, the cast ingot is machined through a cast ingot machine and subjected to forging-free direct rolling to form a plate, the rolling temperature is 940 DEG C, the finish rolling temperature is 880 DEG C, five passes of rolling are conducted, the rolling deformation of the first pass is 50% or above, and the accumulative deformation is 90%. According to the method, a proper amount of B element is added, a TiB phase is generated in the TA4 titanium material, grains are refined, and then the mechanical property of the TA4 titanium material is improved through multi-pass large-deformation rolling. The method is low in process cost, short in flow, good in material comprehensive performance and free of large-scale equipment transformation.