60 results about "Fracture failure" patented technology

The invention relates to an aero-engine stator part crack critical dimension comprehensive determination method and system, and belongs to the technical field of aviation, the method comprises the following steps: obtaining an aero-engine typical hot end stator part geometric model and material parameters, and carrying out static strength analysis according to fluid-thermal-solid coupling load characteristics in actual working conditions; inserting an initial crack into a first principal stress plane of a dangerous part of the real component, carrying out crack propagation simulation to determine a crack propagation path, and calculating a critical crack size of a dangerous point; analyzing critical crack sizes under different failure modes, such as cooling failure and buckling failure; and integrating analysis results under the multi-failure mode, and determining a comprehensive critical dimension as a final judgment standard. According to the method, through combination of fracture failure and function failure analysis, accurate judgment of the critical dimension of the crack is realized, limitation of a traditional single fracture criterion is broken through, comprehensive function failure analysis is realized, the accuracy of a maintenance decision is remarkably improved, and a scientific basis is provided for condition-based maintenance decision.

The invention relates to the technical field of polymer foam materials, in particular to a preparation method of gradient cross-linked pearl wool microcellular foamation.According to a gradient cross-linked network constructed through a two-stage cross-linking technology, collaborative optimization of the performance of a surface layer and the performance of a core part of the material is achieved, a compact three-dimensional net-shaped structure is formed in a high-cross-linking-degree area of the surface layer, and the core part of the material is expanded; the surface hardness, wear resistance and tear resistance of the material are remarkably enhanced, external impact and friction damage are effectively resisted, the low-crosslinking-degree area of the core part retains the moderate movement capacity of a polymer chain, the material is endowed with excellent energy absorption characteristic and flexibility, and the material has good mechanical properties when bearing complex stress. Stress dispersion can be achieved through surface layer-core part synergistic deformation, fracture failure caused by local stress concentration is avoided, meanwhile, a gradient cross-linked network provides a controllable melt strength gradient field for supercritical fluid foaming, and therefore accurate control over the size and distribution of foam holes is achieved in the single-time foaming process.

The invention provides an ice damage multi-physical synchronous measurement system. The ice damage multi-physical synchronous measurement system comprises a motion monitoring control system, an ice load measurement system, a non-contact deformation measurement system, a temperature and pressure monitoring system, a high-speed camera shooting acquisition system, a multi-physical quantity measurement synchronous triggering acquisition system and a multi-degree-of-freedom self-adaptive measurement integrated mobile platform, the motion monitoring control system is used for monitoring and feeding back displacement, speed and output force of the impact head in the execution process controlled by the servo control system; the ice load measuring system comprises a load force sensor which is used for calibrating system errors in the same experimental environment and providing output compensation for the motion monitoring control system; and the high-speed camera acquisition system is used for recording transient image information in the ice material fracture failure process and measuring and calculating the crack propagation speed through proportional calibration. Important parameters in the submerged jet flow and mechanical cooperation ice damage test process can be accurately monitored and recorded, and the accuracy and repeatability of the test are guaranteed.

The invention belongs to the technical field of ductile metal fracture analysis, provides an explicit cohesion phase field material point method, and provides a brand new numerical calculation method for metal dynamic fracture damage research. In the method, aiming at the problems of large deformation and high-speed impact in ductile metal spallation and penetration failure, a cohesion phase field material point method and a marble compliant contact algorithm are innovatively provided. The cohesion phase field model can well describe the damage softening and fracture behaviors of the tough metal. The marble compliant contact algorithm effectively suppresses the problems that the speed of impacting the contact surface is over-oscillated and the normal vector outside the contact surface is difficult to calculate. Then, a control equation of dynamic fracture of the ductile metal is deduced through a Lagrange equation, and the control equation of the coupling displacement and cohesion phase field model is discretized in a material point method framework; and finally, a phase field-displacement field interlaced solution strategy is adopted to stably and efficiently solve the problems of contact, large deformation and other strong nonlinear large-scale ductile fracture damage.

The present application relates to a kind of spot I type nugget fracture failure constitutive model construction method, belong to the fracture mechanics and numerical simulation method technical field of spot welding joint.The technical scheme of the present application is: the parameter construction of constitutive model is carried out, parameter is directly used for spot welding joint related finite element simulation;Spot welding joint is bonded with uniaxial tensile fixture, and the tensile experiment of nugget fracture form is completed under tensile testing machine and the load-displacement curve and maximum load are recorded;Finite element model is constructed and tensile displacement is calculated;Convert and correct stress-displacement curve in combination with measured nugget area, solve maximum tensile stress and fracture energy, parameter is substituted into model and the precision of replacement connection mode is verified.The beneficial effects of the present application are: the accurate construction of spot I type nugget fracture failure constitutive model is realized, which provides standardized mechanical parameter support for spot welding joint structure reliability design and welding process optimization, and significantly improves the accuracy and engineering application value of finite element simulation.

The invention discloses a material deformation simulation parameter measurement method and device based on a GISSMO failure model, a computer system and a storage medium. By combining experimental data with simulation calibration of a GISSMO failure model, high-precision parameterization representation of material deformation and fracture behaviors is realized. A real stress-strain curve (including an elastic stage and a plastic stage) obtained by a tensile fracture experiment is compared with a simulation curve (including an elastic stage, a plastic stage and a failure stage) output by a GISSMO model, so that the full-process simulation precision of the material from elastic deformation and plastic flow to fracture failure is ensured; and the problem of rigidity overestimation or deformation prediction deviation caused by neglecting the failure stage in the traditional method is solved.

A kind of casting method of large lip, it is related to mining machinery technical field, in order to prevent lip fracture failure, by using easy cutting piece on large heat riser, adopt impact form to remove riser, on the premise of meeting basic feeding, as far as possible to reduce the generation of surface microcracks from the source, further, customer standard requires that surface crack should not be less than 7mm, before quenching and tempering, all cracks found are removed by welding repair or grinding, in the process of heat treatment, two Φ120-Φ160mm reinforcing bars are set to prevent crack caused by deformation, after quenching and tempering, all defects greater than 3mm are removed by grinding, etc., suitable for wide range of popularization and application.

The invention provides a fastening connection system reliability dynamic modeling method which comprises the following steps: establishing a reliability model of fracture failure and loosening failure of a single threaded connection pair to obtain the reliability of the single threaded connection pair in different failure modes; based on a multi-competitive failure mode of a single threaded connection pair, establishing a dynamic reliability model of the fastening connection system under consideration of dynamic degradation by introducing an exponential decay model; wherein the exponential decay model is used for representing the decay process of the bolt pre-tightening force and strength along with time; and constructing a general generation function of each threaded connection pair for performing dynamic reliability calculation on the dynamic reliability model of the fastening connection system, and determining an optimal maintenance interval. According to the method, the multi-competition failure problem of fracture failure and loosening failure of a single threaded connection layer is effectively solved, the method better conforms to engineering practice, calculation is convenient and easy, implementation is easy, and engineering technicians can conveniently master the method.

The invention relates to the technical field of basalt fiber anchor rods, and discloses a high-toughness-shear-resistant basalt fiber anchor rod which comprises a rod body, annular grooves are evenly formed in the axial outer wall of the rod body, a limiting mechanism is arranged on the lower portion of the outer wall of the rod body in a sleeving mode, an abutting mechanism is arranged on the portion, located above the limiting mechanism, of the outer wall of the rod body, and the limiting mechanism comprises a lock. The lockset is arranged on the lower portion of the outer wall of the rod body in a sleeving mode, a round hole is formed in the middle of the lockset, the inner wall of the round hole is slidably connected with the rod body, and horizontal sliding grooves are symmetrically formed in the two sides of the bottom end of the lockset. When the tensile strength of the anchor rod is close to the ultimate tensile strength of the anchor rod, fracture failure of the anchor rod is avoided through the interlocking, anti-sliding and relocking effects among the lockset, the clamping piece and the convex bodies on the surface of the basalt fiber anchor rod, and surrounding rock deformation energy absorption is achieved. The shear-resistant sleeve can effectively disperse shear force and improve shear strength, and meanwhile brittle failure caused by local stress concentration is avoided.

The invention relates to a steel fracture cleaning solution as well as a preparation method and application thereof, and relates to the technical field of fracture failure analysis. The steel fracture cleaning solution comprises the following components: citric acid, hydrochloric acid, glycerol, a corrosion inhibitor and water. According to the fracture cleaning fluid, the raw materials are extremely easy to obtain, the cost is low, and the fracture cleaning fluid has extremely high use value. In addition, the invention further elaborates the preparation and application scenarios of the steel fracture cleaning fluid in detail. When the steel fracture cleaning solution prepared by the invention is used for cleaning a steel fracture sample in a service state, the cleaning time can be remarkably shortened, and the cleaning efficiency is improved. And after processing, a fracture observation surface with a large-area oxide layer effectively removed can be obtained, so that the real morphology of the steel fracture is precisely reduced, related information of corrosion components of the steel fracture is obtained, and reliable basic data is provided for subsequent steel performance evaluation and failure analysis.

This invention provides a method, apparatus, computer equipment, and medium for predicting the failure of a wheel disc, relating to the field of digital twin technology. The method includes the following steps: conducting a uniaxial quasi-static tensile test on a tensile test specimen to obtain the engineering stress-strain curve of the wheel disc; converting the engineering stress-strain curve into a true stress-strain curve; constructing a wheel disc failure prediction model under deterministic conditions based on the true stress-strain curve; performing sensitivity analysis on the quantified parameters of uncertainty; obtaining sample data under different working conditions through finite element calculation based on key parameters; constructing a maximum strain proxy model for the wheel disc based on the sample data; inputting the key parameters into the maximum strain proxy model to obtain the confidence interval of the wheel disc's rotational speed at the time of failure. This scheme, by constructing a maximum strain proxy model for the wheel disc, achieves high-precision full-domain simulation of the wheel disc's failure process, solving the problems of limited test measurement points and insufficient simulation accuracy.

The application discloses a kind of based on ENDB sample dynamic fracture toughness testing device, including test auxiliary device and Hopkinson bar experimental device, Hopkinson bar experimental device includes incident bar and transmission rod, test auxiliary device includes load transmission structure, dial, support seat component, sample fixing assembly and auxiliary fixing assembly, dial, sample fixing assembly and support seat are fixed by distance adjusting component of three through three connections.This application can accurately adjust the included angle α between loading rod and prefabricated crack, so that the dynamic fracture toughness test of a variety of different angles III and I, III mixed type can be realized, the dynamic fracture toughness test experiment of a variety of diameter sizes ENDB sample can be satisfied, and a certain fracture failure play space is reserved between dial and sample, to improve sample damage effect and the accuracy of experimental results.The whole device has no direct or indirect contact with the outside world, reduces the loss of energy, improves the accuracy of experimental results.

The present application relates to the field of ocean engineering and mechanical engineering technology, in particular to a fan blade crack propagation analysis method and device considering real marine environment. The method considers real marine environment working conditions, performs dynamic simulation analysis on the fan blade, determines the load distribution information borne by the fan blade and loads it on the finite element model of the fan blade, determines the fatigue hot spot area according to the finite element fatigue damage analysis result and performs crack arrangement. Through the finite element simulation result, the stress intensity factor of the crack tip is calculated and crack propagation simulation is performed to evaluate the fracture failure risk of the fan blade under real marine environment. The fan blade crack propagation analysis idea under complex stress conditions is proposed, which can prevent equipment failure and risk caused by blade fracture, provide a scientific basis for fan maintenance and operation, and thus reduce economic losses caused by fan blade failure.

The present application relates to the technical field of virtual reality tactile feedback, and discloses a preparation method of a virtual reality multi-modal tactile feedback hardware device, which comprises the following steps: a serpentine structure driving unit is prepared through wire winding and setting; the serpentine structure driving unit is embedded and cast in a flexible base, and then electrical connection and a power supply module integration are completed to obtain a tactile feedback hardware device capable of independent multi-channel driving. The serpentine structure driving unit is prepared by adopting a wire winding and setting process, which replaces a traditional plate cutting processing mode, can effectively avoid burrs and micro-cracks generated at the edges of the driving unit, completely retains the material performance of the shape memory alloy, significantly improves the fatigue life and deformation precision of the driving unit, and reduces the risk of fracture failure in the long-term use process.

The invention discloses a method for determining size-effect-free fracture parameters of an MGPCC material and a method for evaluating the performance of the MGPCC material, and belongs to the technical field of material performance evaluation. The method specifically comprises the following steps: firstly, preparing MGPCC test pieces with different sizes, seam height ratios and span-height ratios, and carrying out a three-point bending fracture test to obtain related data; then calculating the equivalent crack length and the virtual crack propagation amount, and further determining fracture parameters, such as fracture toughness KIC and tensile strength ft; and a mean value and a standard deviation are obtained through normal distribution statistical analysis, and finally the size-effect-free fracture parameters are determined. According to the method, the influence of various factors on fracture parameters is comprehensively considered, the normal distribution hypothesis is verified by adopting K-S verification, and the reliability of data is ensured. The fracture failure curve is constructed based on the determined fracture parameters, the fracture failure type of the MGPCC material can be accurately evaluated, and a scientific basis is provided for engineering design.

The application relates to a tunnel structure connecting joint capable of crossing an earthquake fracture zone, which comprises a hole body, a lining and a waterproof protective layer, the lining is composed of a plain concrete layer and a steel plate layer, the steel plate layer comprises an outer steel plate, a rubber layer and an inner steel plate, the outer steel plate and the inner steel plate are tightly attached to the rubber layer respectively but are not fixedly connected, the steel plate layer is arranged in the center of the plain concrete layer and is continuously arranged along the tunnel section, the concrete strength grade of the joint area is lower than that of the non-joint area, so that the ductility and energy consumption capacity are enhanced, compared with the prior art, under the action of small earthquakes and medium earthquakes, the steel plate layer and the plain concrete layer work together to ensure the overall rigidity and strength of the joint, under the action of large earthquakes and extremely rare earthquakes, the two longitudinal steel plates can relatively slide to drive the expansion and contraction of the concrete layer in the joint, the two transverse steel plates can extrude the rubber layer to dislocate and deform, tunnel fracture and damage are avoided, and post-earthquake repair is facilitated.

The invention relates to construction and application of a concrete nonlinear microscopic fracture analysis model under temperature change. In order to solve the technical problem that in the prior art, the coupling effect of the temperature change and the size effect is not considered at the same time, so that the size-effect-free tensile strength and fracture toughness of the concrete after high temperature are accurately determined through small-size test data, relative size and temperature coupling variables are introduced; constructing a virtual crack propagation amount calculation model aiming at the lightweight aggregate concrete and the common concrete; establishing a microscopic fracture theory based on small-size test piece test data inversion size-effect-free material parameters; introducing normal statistical analysis to determine a 95% guarantee rate confidence interval; and constructing a fracture failure whole curve and a peak load prediction model. Unification of test standards is achieved, the influence of the size effect is effectively eliminated, the prediction precision of the mechanical property of the concrete after high temperature is remarkably improved, and reliable technical support is provided for safety evaluation of the concrete structure after a fire disaster.

The utility model relates to a reinforced mould pressing tray which comprises a panel, first foot piers and a brace plate, the lower portion of the panel and the first foot piers are integrally formed, the length of the first foot piers is larger than the width of the first foot piers, and the brace plate is located below the first foot piers and fixedly connected with the first foot piers. The length direction of the first foot pier is perpendicular to the length direction of the fixed brace plate. The length direction of the first foot piers is perpendicular to the length direction of the brace plate fixedly connected with the first foot piers, when the pallet fork is perpendicular to the brace plate to push the pallet, the length direction of the first foot piers is the same as the stress direction, the structural strength of the first foot piers in the stress direction is improved due to the longer length, the first foot piers are not prone to fracture and damage, and the service life of the pallet is prolonged. The problem that a tray foot pier is prone to breakage when a pallet fork is pushed is solved.

The utility model relates to permanent magnet synchronous motor technical field especially relates to a kind of anti-fracture elastic buffer type motor terminal, comprising: straight insertion piece pin, elastic buffer structure and crimping cavity, the bottom of straight insertion piece pin is connected with the one end of elastic buffer structure, the other end of elastic buffer structure is connected with the top of crimping cavity, the inner wall lower part of crimping cavity is provided with anti-withdrawal boss, anti-withdrawal boss center is provided with wire inlet, the inner wall upper part of crimping cavity is provided with grid recess.The utility model is added elastic buffer structure between straight insertion piece type pin and the crimping cavity of lead-out wire, release and isolation of temperature or vibration stress are realized, block mechanical stress conduction to straight insertion piece pin, fundamentally solve the problem of pin root fracture failure caused by vibration of traditional terminal.By adopting the structure that anti-withdrawal boss and net-shaped recess cooperate, make motor lead-out line end and wiring terminal connection more stable, not easy to loosen, have better conductive effect.

The invention discloses an MGPCC fracture performance evaluation method and system based on an improved boundary effect model, and belongs to the technical field of material fracture performance testing. On the basis of a traditional boundary effect model, influence parameters of a macro-fine-micro level are fused, a more accurate improved model is constructed, then fracture parameters of a material are calculated, and the fracture performance of the material is evaluated. And a fracture and failure curve is constructed by combining different types of test pieces (sizes, fracture height ratios and span-height ratios), and the fracture and failure types are accurately evaluated. According to the method, multi-level factors are integrated, so that the model is more practical, the evaluation accuracy is improved, the fracture behavior can be effectively predicted, a basis is provided for engineering design and safety evaluation, and the method has important significance in promoting scientific application of an MGPCC material in the engineering field.

The embodiment of the specification provides a material mesoscopic fracture failure simulation method, sample material pairs are sheared according to a preset shearing strategy, a stress evolution process of the sample material is measured, a temperature evolution process and a mesoscopic organization deformation evolution process of the sample material are synchronously measured, evolution process data of the mesoscopic organization is collected, a mesoscopic simulation model is built, attribute data of the sample material is acquired, model parameters of the mesoscopic simulation model are trained in combination with the attribute data of the sample material, the shearing strategy and the evolution process data, after training, future period evolution processes of stress, temperature and mesoscopic organization deformation generated by the shearing strategy implemented on the current material are predicted by using the mesoscopic simulation model, whether the sheared material produces fracture failure is judged based on the future period evolution processes of the stress, the temperature and the mesoscopic organization deformation, and the advance and effectiveness of the material fracture failure simulation are improved.

This invention relates to piezoelectric MEMS fans and their stress optimization design, fabrication, and chip in the field of MEMS actuators. The piezoelectric MEMS fan includes a support frame and at least one piezoelectric motion arm extending from the support frame. The piezoelectric motion arm has multiple stress-dispersing openings, and the distribution pattern of these openings is configured to disperse stress concentration within the piezoelectric motion arm during vibration. This invention designs a specific stress-dispersing opening pattern on the piezoelectric motion arm, which is optimized based on vibration stress field analysis. This pattern effectively disperses and releases the alternating stress borne by the motion arm during long-term high-frequency vibration, especially alleviating stress concentration in critical areas such as the root, thereby greatly suppressing the initiation and propagation of fatigue cracks and reducing performance degradation and the probability of fracture failure.

The application provides a composite material outer channel nacelle failure prediction method, comprising the following steps: ① adding main layers: according to the structure of the outer channel nacelle, main and auxiliary layers are arranged on the stress surface of the outer channel nacelle based on load proportion; ② adding additional auxiliary layers: according to the structure of the outer channel nacelle, additional auxiliary layers are arranged on the surface of the main and auxiliary layers; ③ nacelle strength calculation: the static strength of the nacelle is calculated under working load by adopting finite element simulation, and the maximum equivalent strain of the nacelle is calculated; ④ additional auxiliary layer load calculation; and ⑤ main and auxiliary layer failure calculation. The application can predict the fracture failure behavior of the composite material, take fracture as the criterion for the failure of the composite material outer channel nacelle, fully utilize the mechanical properties of the composite material, reduce the wall thickness of the composite material outer channel nacelle, and further realize the weight reduction effect of the composite material outer channel nacelle.

The invention belongs to the technical field of material bulletproof performance test characterization, and relates to a ballistic impact test method for evaluating the bulletproof energy absorption characteristic of a bulletproof fabric, which comprises the following steps: dividing a soft bulletproof layer into three area layers according to bulletproof damage: a local fracture failure layer, a bullet front end compression layer and an undeformed layer; a penetration test is conducted on the soft bulletproof layer, and corresponding experimental data of at least two bullet velocities and the number of penetrated layers of the soft bulletproof layer are obtained; solving to obtain local fracture failure energy absorption Wsingle of the single-layer bulletproof fabric and deformation energy absorption Wform of a compression area at the front end of a warhead; and calculating to obtain the critical penetration velocity Vc of the multi-layer bulletproof fabric under the synergistic bulletproof effect. According to the invention, the accuracy and reliability of the test for evaluating the bulletproof energy absorption characteristic of the bulletproof fabric are improved, and more accurate data support is provided for the design and optimization of bulletproof materials.

The present disclosure relates to an aero-engine stator crack critical size comprehensive judgment method and system, belonging to the field of aviation technology, the method comprising: obtaining the typical hot end stator component geometric model of the aero-engine, material parameters, and carrying out static strength analysis for the flow-thermal-solid coupling load characteristics in the actual working condition; inserting an initial crack in the first principal stress plane of the real component dangerous position and carrying out crack propagation simulation to determine the crack propagation path and calculate the critical crack size of the dangerous point; analyzing the critical crack size under different failure modes such as cooling failure and buckling failure; integrating the analysis results under multiple failure modes to determine the comprehensive critical size as the final judgment standard. The present disclosure realizes accurate judgment of crack critical size by combining fracture failure and functional failure analysis, breaks through the limitations of traditional single fracture criterion, comprehensively analyzes functional failure, significantly improves the accuracy of maintenance decision, and provides a scientific basis for condition-based maintenance decision.

The application provides a kind of twin power station collision visualization simulation method and system based on physical simulation, it is related to data processing technical field, including: obtaining the three-dimensional geometric model of twin power station, space division is carried out, geometric parameter is extracted, material data is obtained to construct material correlation model, mechanics model is fused, and physical simulation model is obtained;Collision initial condition parameters are obtained and used as boundary conditions, local grid encryption is carried out, nonlinear dynamics equation of collision process is constructed, time domain solution is carried out, equivalent stress distribution and equivalent plastic strain distribution are determined, and collision result is generated;Whether plastic deformation or fracture failure occurs is judged, full collision process physical field data is generated, collision animation frame sequence is generated, stress distribution nephogram and plastic strain nephogram are generated, fracture special effect is constructed, and collision visualization scene is comprehensively generated.

The invention discloses a single-domain liquid crystal elastomer as well as a preparation method and application thereof. The preparation method of the single-domain liquid crystal elastomer comprises the following steps: stretching a liquid crystal elastomer film containing dynamic covalent bonds at room temperature to generate small pre-strain and fix the liquid crystal elastomer film; annealing at a temperature higher than the isotropic phase transition temperature and at which the dynamic covalent bonds are exchanged to partially activate the dynamic covalent bonds so as to lock the orientation of the liquid crystal elastomer; cooling to room temperature and releasing fixation; and heating the locked and oriented liquid crystal elastomer until the temperature is higher than the isotropic phase transition temperature, and then cooling to room temperature to obtain the single-domain liquid crystal elastomer. The preparation of the single-domain liquid crystal elastomer is realized by applying small pre-strain, so that the requirements on the pre-strain amplitude and equipment are remarkably reduced, and the risk of fracture failure of the material under high-temperature and high-strain conditions is avoided; gradient or multi-stage driving performance can be obtained in the same sheet by applying pre-strain in a partitioned manner; the degree of dynamic covalent bond exchange is controlled by regulating and controlling the annealing time, and the reversible driving rate is adjusted.

The invention relates to the technical field of high-temperature alloys, in particular to a high-temperature alloy connecting method and a high-temperature alloy connector, and the high-temperature alloy connecting method comprises the steps that after a convex base material and a concave base material which are to be connected are joggled, a specific welding tool is adopted for assembling and fixing; and the convex base metal, the concave base metal and the welding tool are put into a high-temperature vacuum furnace together to be welded. According to the method, joggling and welding are combined, in the member service process, the base metal and the weld joint bear the external force together, the acting force borne by the connector can be conducted through the base metal, and the durability and fatigue performance of the connector can be improved. Compared with a plane welding joint, in the service process of the joggle joint and welding composite joint, after a certain welding position loses efficacy, the concave-convex nested mechanical interlocking structure can still keep certain strength, and rapid fracture and failure are avoided.

The application discloses a method for calculating a constraint factor of crack initiation in a structure, and the crack initiation fracture toughness value K JQ of different sizes in the structure at different temperatures T NDT The dispersion data of the crack size a and the structure wall thickness W ratio a / W, the material ductile-brittle transition temperature RT JQ and the like are analyzed, and the analysis process is as follows: first, the fracture toughness value K NDT at different temperatures T is analyzed, and the slope and the intercept are obtained by performing linear analysis on the data; second, the relationship between the intercept value and the temperature T and the material ductile-brittle transition temperature RT NDT is analyzed; third, the ideal fracture toughness K JQ‑idealize is calculated; fourth, the constraint factor F value is obtained by considering the ideal fracture toughness K JQ‑idealize , the reference fracture toughness K JQ‑base and the like. The constraint factor calculation method can serve the fracture failure risk analysis of a primary loop pressure-bearing device of a nuclear energy system, and better serve the analysis and design of the nuclear energy device.

The present application relates to a cold-formed steel composite wall with replaceable impact protection device, comprising: a cold-formed steel composite wall, an impact protection bottom plate system and an impact protection panel system. On the outside of the cold-formed steel composite wall, the impact protection device is formed by the impact protection bottom plate system and the impact protection panel system, which plays a role in isolating and weakening the impact through a honeycomb filling core and a crimped grid. The crimped grid breaks and destroys the impact energy through a sacrificial connection structure, reducing the impact of the cold-formed steel composite wall. In addition, the high elasticity of the crimped material and the invisible length of the crimped ring fully convert the impact energy into elastic potential energy, thereby protecting the cold-formed steel composite wall and improving the safety of the cold-formed steel composite wall structure system, reducing the disaster loss of impact accidents; the impact protection device can be replaced to continue to protect the cold-formed steel composite wall structure system at a lower cost.