74 results about "Creep strain" patented technology

The invention discloses a concrete nonlinear creep explicit modeling method and system, and relates to the technical field of concrete structures and materials.The concrete nonlinear creep explicit modeling method comprises the steps that concrete creep test data under all conditions are collected, and a test data set is constructed; preprocessing the concrete creep test data of the test data set; a DBO algorithm is adopted to optimize hyper-parameters of the LGBM model, and the LGBM model is constructed and trained through the test data set and the optimal hyper-parameters; the input features of the trained LGBM model are screened through an SHAP additive interpretation method, and key feature parameters are obtained; and establishing a concrete nonlinear creep explicit calculation formula by using a PySR symbol regression tool and taking the key characteristic parameters as input and the creep strain as output. The concrete nonlinear creep explicit modeling method provided by the invention has both calculation precision and engineering practical value.

The invention relates to a MATLAB working condition prediction and ANSYS matching surface creep analysis method, and belongs to the technical field of mechanical engineering structure connection analysis and monitoring and computer-aided engineering software integration. The method comprises the following steps that a user inputs geometric parameters and typical working conditions through an MATLAB GUIDE interaction interface, and a system can generate a theoretical response curve of the matching surface pressure changing along with the magnitude of interference, the load and the rotating speed in real time and is used for evaluating the maximum allowable working parameter range. And then ANSYS is called to carry out batch finite element simulation, and actual contact pressure distribution and a creep strain cloud picture are obtained, so that the influence of different working condition combinations on the creep behavior of the matching interface is quantified. The method supports visual comparative analysis under the combination of multiple working conditions, and a user can intuitively master the evolution law and the creep development trend of the pressure distribution of the matching surface. The interactive critical failure discrimination module integrated in the system can automatically identify typical contact failure situations and perform significant annotation in images.

The application discloses a creep deformation statistical analysis method, and specific steps are as follows: step 001, obtaining creep deformation and time relationship of not less than three same size samples of same batch material or same batch parts under the same condition; step 002, selecting some typical time and corresponding creep strain, selecting a suitable statistical distribution function to statistically analyze the creep strain under the typical time, and fitting the distribution parameters; step 003, calculating the survival rate of the tested sample or part not more than a certain creep strain or the creep strain of the tested sample or part under a certain survival rate under the selected statistical distribution function, and drawing a P-C-T curve; through the method, the creep deformation of the material or the part can be statistically analyzed, and then the survival rate of the material or the part not more than a certain creep strain under a given condition can be calculated, which has important significance for accurately evaluating the creep performance of the material or the part.

The invention discloses an equal-life design method for an engine rotor and stator blade structural member based on an isochronous stress-strain relationship, which is suitable for creep / endurance life design of the engine rotor and stator blade structural member. Acquiring a tensile stress-strain curve and a creep curve of the material at different temperatures and stresses; according to the target design life of the engine, extracting a stress-creep strain relation at the target life moment from the creep curve, and superposing the stress-creep strain relation with the tensile stress-strain curve to construct an isochronous stress-strain relation under the target life; inputting the isochronous stress-strain relationship into a rotor and stator blade finite element model, and calculating stress-strain distribution at a target life moment; and based on the comparison of the calculation result and the failure criterion, carrying out the weight reduction or local thickening optimization design of the blade until the target life requirement is met. The life prediction precision can be improved, the calculation cost is reduced, and the method has important engineering application value.

The invention constructs a fracture conductivity evaluation method considering shale hydration. The method mainly comprises the following steps: 1, carrying out a triaxial hydration creep mechanics experiment, establishing an elastic-viscoelastic-viscous plastic multi-stage creep constitutive equation based on triaxial experiment data, and analyzing shale elastic and viscous deformation mechanisms; 2, secondly, constructing a shale creep constitutive model by stages according to a stress threshold value, describing a viscoelastic stage by adopting an improved Burgers model, and establishing a viscoplastic strain equation based on an overstress theory; 3, coupling hydration action parameters to correct a shale creep equation, and quantifying the influence of hydration on rock modulus, viscosity coefficient and yield stress; 4, the creep strain and the crack dynamic width are correlated through a mathematical model, and a multi-field coupling relation is established in combination with a permeability evolution rule; and 5, finally constructing a fracture conductivity prediction model when the hydration effect is considered, and realizing fracture conductivity dynamic analysis under the hydration-creep synergistic effect. According to the method, the shale hydration-creep coupling effect is creatively fused into fracture conductivity prediction, and a quantitative tool is provided for shale reservoir long-term productivity evaluation.

The application discloses a kind of prediction methods of high-strength steel wire high temperature creep behavior of rust, belong to bridge cable safety assessment technical field.The method is first obtained by test the material intrinsic material parameters of rust high-strength steel wire test piece and un-rust high-strength steel wire test piece;Then three-dimensional scanning quantization corrosion morphology is used, the maximum pit depth of rust high-strength steel wire surface and the pit root radius of pit bottom are extracted, and then the stress concentration coefficient and the effective bearing area decay function after net section loss are calculated, and the corrosion damage index is introduced;On this basis, the creep strain rate prediction model considering local stress concentration, section loss and material damage is established.The prediction method of the application realizes the quantitative prediction from pit micro-morphology to macro creep behavior, and has great engineering application value for evaluating the safety and residual life of in-service bridge cable.

The application discloses a kind of bridge structure in concrete shrinkage and creep calculation method, equipment and storage medium, the method includes using initial strain method to calculate stress increment and creep strain increment in different period, and then calculate stress and creep strain at different time;According to the stress increment of different period, stress-strain relationship and creep coefficient fitting function calculation period Δt n+1 Internal concrete creep caused by unit equivalent node load increment;According to concrete shrinkage strain increment calculation period Δt n+1 Internal concrete shrinkage caused by unit equivalent node load increment.The application can accurately calculate the shrinkage and creep effect of concrete in the structure when applied to bridge structure analysis, greatly improves the calculation efficiency and saves storage space.

The invention provides a method for analyzing time-history stress relaxation of anchoring force of a pre-stressed anchor cable under high-pressure stress, and relates to the technical field of geotechnical engineering. According to the method, engineering geological investigation, ground stress testing and indoor triaxial rheological testing are systematically combined, a potential high-stress area is accurately recognized, key rheological parameters of a rock-soil body are obtained, and then the stress self-adaptive creep coupling constitutive model with the long-term strength of the rock body as the criterion is constructed; and finally, accurately predicting the time-history creep strain of the rock-soil body and the anchoring force loss of the anchor cable under the high stress condition through numerical calculation. According to the method, the defect that a traditional creep theory describes a nonlinear creep behavior in a high-pressure stress state and a prestress loss coupling mechanism is effectively overcome, and the prediction precision and reliability of mechanical response of an anchoring system are remarkably improved; a basis is provided for long-term stability evaluation and safety control of prestressed anchoring engineering under complex geological conditions, and geotechnical engineering anchoring design and safety early warning are developed towards the refined and intelligent direction.

This invention discloses a method and system for predicting the creep fatigue behavior of martensitic heat-resistant steel, relating to the field of high-temperature creep fatigue performance evaluation technology. The method includes: acquiring the microstructure evolution of copper-containing martensitic heat-resistant steel during the test process, obtaining the cyclic strength change rate based on the microstructure evolution, and calculating the creep rate of the copper-containing martensitic heat-resistant steel in the dislocation climb hard phase, as well as the dislocation density under cyclic loading conditions; based on the cyclic strength change rate, creep rate, and dislocation density, obtaining the elastic strain tensor, plastic strain tensor, and creep strain tensor of the copper-containing martensitic heat-resistant steel, and predicting the stress-strain evolution of the copper-containing martensitic heat-resistant steel under cyclic loading conditions based on the elastic modulus tensor; this invention overcomes the limitations of macroscopic creep fatigue behavior prediction methods and provides a new approach to revealing the influence of microstructure on creep fatigue performance.

The invention belongs to the technical field of bearings, and discloses a foil dynamic pressure radial gas bearing bump foil creep test method, which is characterized in that a miniature rubber block is inserted between a top foil and a rigid substrate, and the miniature rubber block is used as a flexible element, is in direct contact with the top foil, and deforms under the action of a compression load transmitted by the top foil; a monocrystalline silicon semiconductor strain gauge is pasted on the side face of the miniature rubber block, and the direction is perpendicular to the direction of the compression load; in the running process of the bearing, the output strain value of the strain gauge is monitored in real time through a data acquisition system; the semiconductor strain gauge is a sensitive element manufactured based on the piezoresistive effect of semiconductor monocrystalline silicon, the resistivity of a semiconductor crystal material is changed when the semiconductor crystal material is stressed in a certain direction and deforms, and strain, stress and the like are indirectly measured. The device has the beneficial effect that the problem that the creep strain is difficult to test in real time due to the tiny structure of the bump foil is solved.

The present invention relates to a stress intensity limit S t A failure probability assessment method is provided, comprising: obtaining creep rupture test data of specimens under different working conditions, including creep rupture life and creep strain-time curves; determining the standard error of the logarithmic creep rupture life; determining the average stress required for the total strain to reach 1%, the minimum stress at the onset of the third stage of creep, and the minimum stress causing creep rupture under each working condition, as the first criterion stress, the second criterion stress, and the third criterion stress, respectively; determining creep life models corresponding to the first, second, and third criterion stresses; determining creep life models considering safety factors corresponding to the first, second, and third criterion stresses; determining probability parameters corresponding to the first, second, and third criterion stresses based on the creep life model after introducing probability parameters and the creep life model considering safety factors for each criterion; and calculating the failure probabilities of the first, second, and third criterion stresses under different working conditions.

The application discloses a structure suitable for creep supervision of P91 pipeline containing a soft area, which comprises a plurality of creep supervision measuring points fixedly installed on the outer wall of the P91 pipeline containing the soft area, wherein the creep supervision measuring points comprise a creep supervision measuring point upper layer and a creep supervision measuring point lower layer which are stacked together, and at least one of the creep supervision measuring points is located on the soft area of the P91 pipeline. The structure suitable for the creep supervision of the P91 pipeline containing the soft area can carry out the creep supervision on the soft area with the worst creep performance, the supervision object is more targeted, the creep strain law of the soft area of the pipeline can be accurately reflected, lossy detection such as hardness detection and metallographic detection does not need to be frequently carried out, no damage is caused to the pipeline, and more data support can be provided for the supervision and evaluation and life assessment of the pipeline. The application also discloses an evaluation method suitable for the creep supervision of the P91 pipeline containing the soft area, which has the same advantages as the structure suitable for the creep supervision of the P91 pipeline containing the soft area.

The present invention relates to a method for testing the uniaxial creep threshold of a metal material, comprising: step 1, setting a nominal stress and performing a creep test on the metal material sample based on the nominal stress; step 2, if the creep strain within a preset time is greater than 1 / 10,000, reducing the nominal stress and re-performing the creep test for the preset time using a new sample; and re-performing step 2 or step 3; step 3, if the creep strain within the preset time is less than or equal to 1 / 10,000, increasing the nominal stress and continuing the creep test for the same preset time until the creep strain within the preset time is greater than 1 / 10,000, and then stopping the test; and step 4, obtaining the creep threshold of the sample. The present invention can quickly measure the uniaxial creep threshold of a metal material, saving testing costs.

The invention relates to a method for constructing a rock salt nonlinear damage creep constitutive model considering a temperature effect. The method comprises the following steps: constructing an element combination model formed by connecting an elastomer, a nonlinear viscous body and a generalized Kelvin body in series as a basic framework of the rock salt nonlinear damage creep constitutive model considering the temperature effect; introducing a damage variable related to time and temperature; establishing a constitutive equation of the nonlinear viscous body of the salt rock; based on the constitutive equation of the salt rock nonlinear viscous body, deducing a total creep strain expression of a salt rock nonlinear damage creep constitutive model considering the temperature effect in a one-dimensional stress state; and carrying out uniaxial compression creep tests on the salt rock sample at different temperatures by adopting a graded loading mode to obtain strain-time data and a corresponding creep curve of the salt rock sample at the corresponding temperature, and carrying out inversion to determine model parameters in the total creep strain expression. The invention also provides a long-term deformation prediction method of the salt-cavern underground gas storage cavern structure.

The application discloses a fuel rod cladding rupture failure modeling calculation method, system, equipment and medium. The material of the cladding is Zr-4, and the method comprises the following steps: determining initial conditions, inputting fuel rod geometric dimensions and corresponding fuel, cladding material properties and boundary conditions; calculating the temperature distribution of fuel and cladding at each time based on the physical properties of fuel, cladding and the gap between fuel and cladding; calculating the thickness and mass of the oxidation layer, calculating the volume fraction of Zr-4 converted from alpha phase to beta phase through a crystal phase change model; calculating the high-temperature creep strain rate of the cladding through a high-temperature creep model, calculating the hoop creep strain of the cladding and the hoop stress of the cladding, and updating the gas volume in the cladding and calculating the gas pressure; based on the high-temperature creep strain rate of the cladding, calculating the hoop creep strain of the cladding or the hoop stress of the cladding, evaluating whether the cladding ruptures through a cladding rupture failure criterion and obtaining the rupture time. The application can accurately determine the time of cladding rupture.

The present application relates to the technical fields of high temperature creep test, in particular to a method for obtaining high temperature creep parameters of iron-nickel based alloy, which mainly determines the creep strain model of iron-nickel based alloy, obtains the creep strain rate calculation formula from the creep strain model, implements two creep tests of target test material under two different creep stresses at target temperature, respectively obtains the creep curves corresponding to creep time and creep strain, selects two creep times at the first stage and the second stage of the two creep curves respectively, obtains the creep strain and creep strain rate under the creep stress corresponding to the two creep times respectively, substitutes into the creep strain model and the creep strain rate calculation formula, and calculates the variable parameters of the creep strain model. The evaluation process of the creep model is greatly simplified, the required number of creep tests and test time are reduced, and the test cost is reduced.

The present invention relates to a method for predicting creep damage in high-temperature, pressure-bearing structures. The creep damage of high-temperature structures is assessed using a creep deformation prediction model. The creep damage value D is the ratio of the creep strain value ε of the equipment at time t to the creep ductility parameter εD of the pressure-bearing equipment material. The creep ductility parameter is the creep strain value corresponding to the intersection of the extended deformation curve of the material in creep stage II and the material's fracture life at time t. The creep deformation prediction model provided by the present invention can accurately predict the entire creep deformation process of a material within a wide stress range. The model parameter identification process is simple, and the evaluation results are safe and reliable. The model is suitable for evaluating the creep damage state of key high-temperature structural components.

The invention discloses a small deformation mechanical analysis system and method based on a reactor numerical calculation framework and related products, and relates to the technical field of nuclear reactor fuel performance analysis. On the basis of a reactor numerical development framework, a unified tangent modulus and stress data interface is constructed according to a finite element theory and mechanical constitutive models such as elasticity, plasticity and creep; a radial regression algorithm is used for calculating the plasticity / creep strain of a nonlinear material, consistent tangent modulus and stress data are updated and transmitted into a nonlinear solver, a small deformation mechanical analysis system of a reactor numerical development framework is formed, and theoretical model support is provided for a fuel performance analysis program based on small deformation.

The present invention discloses a method for analyzing the scale effect of creep strain measurement of metal materials, comprising the following steps: Step 001, dividing a creep specimen test section S under a certain stress state into reference test sections C composed of multiple materials and the same process under the same stress state, assuming that the creep strain of the test section S at a given creep time is approximately n S The method of the present invention is used to quantify the difference between creep strains or creep curves measured on specimens of different sizes under the same stress state, thereby better understanding the creep properties of materials.

The application discloses a kind of high-temperature bolt creep deformation measurement methods, simply summarized, including the following steps: step 1) correction is carried out to measuring micrometer;Step 2) the initial length of high-temperature bolt before operation ( L 初 ) is measured; Step 3) the original length of high-temperature bolt when converting to 0 ℃ ( L 初1 );Step 4) the length of high-temperature bolt after operation ( L 运 ) is measured;Step 5) the length of high-temperature bolt after operation when converting to 0 ℃ ( L 运h );Step 6) the absolute creep deformation amount (△L) of high-temperature bolt is calculated;Step 7) the relative creep strain (ε) of high-temperature bolt is obtained.The creep measuring point of high-temperature bolt is simple and reasonable to install, and measurement error is not easy to produce.The measurement operation is simple, fast, and the measurement result is high in precision and small in error, the creep deformation of high-temperature bolt can be accurately measured by micrometer, which is convenient for industry promotion and conducive to the development of high-temperature bolt creep supervision work.

This invention discloses a method for constructing a fractional-order creep damage constitutive model, relating to the field of geotechnical engineering technology. The method includes: conducting creep tests on a geogrid under different types of soil constraint stress to obtain creep curves; calculating the creep strain of the geogrid at different time points based on the creep curves and plotting the curve of the geogrid's creep strain versus time; introducing the Khachanov damage variable according to the creep damage law to determine the damage variables during the geogrid creep process; constructing an initial fractional-order creep damage constitutive model based on the damage variables, and determining the parameters of the initial fractional-order creep damage constitutive model through the curve of the geogrid's creep strain versus time, thus obtaining the fractional-order creep damage constitutive model. The fractional-order creep damage constitutive model constructed by this invention can accurately reflect the variation law of the geogrid at different creep stages.

This invention discloses a high-temperature creep-resistant die-cast magnesium alloy material with the following mass percentages: Al 4.0-8.0%, La 0-2.5%, Ce 0-3.5%, Pr 0-1.0%, and Nd 0-1.5%, wherein the total mass percentage of La, Ce, Pr, and Nd is ≤4.0%, and Ca 0.05-1.0%, Sr 0.05-3.0%, Mn 0.2-0.6%, and Si 0.01-0.1%. The ratio of Al content to (RE+Sr+Ca) content is (1-2.5):1, and the ratio of RE content to (Sr+Ca) content is (1-2):1. The balance is Mg and unavoidable impurities. The microstructure is uniformly distributed with a grain size of 10-20 μm, containing Al2La phase, AlMnLa ternary phase, and Al... 11 La3 phase and Al4Sr phase. The preparation method includes the following steps: 1. Calculation of the alloy's thermodynamic properties; 2. Preparation of the alloy melt; 3. Refining and modification of the alloy melt; 4. High-pressure casting of the alloy. The tensile strength is 240-250 MPa; the yield strength is 120-130 MPa; the elongation is 9.5-12.5%; under the conditions of a test temperature of 175℃, an applied stress of 85 MPa, and a test duration of 100 h, the creep strain is less than 0.1%.

This invention discloses a method for evaluating the creep life of high-temperature pipelines based on a physical information neural network. The method includes: obtaining the three-dimensional residual stress distribution of the welded joint region of the high-temperature pipeline based on welding thermo-mechanical coupled finite element simulation or residual stress measurement, and using this as the initial stress field for creep analysis; based on the initial stress field, constructing a stress redistribution model considering service temperature, internal pressure, structural constraints, and material creep effects to obtain the stress field distribution evolving over time; based on the evolved stress field, constructing a physical information neural network model incorporating creep constitutive relations and stress balance constraints to predict the creep strain or creep damage evolution process in key areas of the welded joint, and determining the creep life of the high-temperature pipeline by combining creep failure criteria. This invention can reasonably reflect the relaxation and redistribution behavior of welded residual stress during long-term high-temperature service, thereby improving the reliability of creep life evaluation of high-temperature pipeline welded joints.

The invention discloses a viscoelastic material creep behavior prediction method based on a non-local operator. The method comprises the following steps: acquiring creep test data of a viscoelastic material; the method comprises the following steps of: establishing a Psi-Capto fractional order Burgers model which is formed by connecting a Maxwell unit and a Kelvin-Voigt unit in series; psi-Laplace transformation is adopted to deduce a creep strain expression, a damage evolution theory or a nonlinear viscoelasticity theory is coupled, and kernel functions of a power law type, an exponential type or a logarithmic type and the like are selected according to the characteristics of materials and are fitted with experimental data; identifying model parameters by adopting methods such as a nonlinear least square method; and finally, calculating a fitting precision evaluation index, and predicting the creep behavior of the material. Based on the generalized fractional order derivative theory, the method breaks through the limitation that a kernel function of a traditional fractional order model is fixed, achieves flexible matching of the kernel function and material characteristics, improves prediction precision and applicability, and can be applied to creep property evaluation and life prediction of viscoelastic materials such as asphalt and polymers.

The invention discloses a soft rock foundation bearing capacity evaluation method and device and a site selection method and system. The soft rock foundation bearing capacity evaluation method comprises the steps that soft rock feature data of a soft rock foundation and feature information of nuclear facilities are obtained; determining a first type of creep strain, a second type of creep strain and a third type of creep strain of the soft rock foundation according to the soft rock characteristic data; according to the first type of creep strain, the second type of creep strain and the third type of creep strain, the three-dimensional total creep strain of the soft rock foundation is obtained, and the three-dimensional total creep strain is used for representing the long-term deformation behavior of the soft rock foundation; according to the three-dimensional total creep strain and the characteristic information of the nuclear facility, foundation settlement simulation is conducted on the soft rock foundation, the settlement value of the soft rock foundation changing along with time is obtained, the nuclear facility is built on the soft rock foundation, and the settlement value is used for evaluating the bearing capacity of the soft rock foundation. The accuracy of soft rock foundation bearing capacity evaluation can be improved.

The present invention provides a method for constructing a compressive creep constitutive model of a metal material, which comprises: 1) constructing a constitutive model of the metal material under nominal compressive stress; 2) determining the creep time threshold of the metal material; 3) determining the creep characteristic constant of the material A and B and creep time influencing parameters n and m ;4) Determine the material parameters A 、 n 、 m and B Substituting this into the constitutive model under nominal compressive stress yields a compressive creep constitutive model for metal materials. This method can describe the temporal relationship between creep strain and deformation under constant compressive loads, and can also predict the creep deformation behavior of metal materials under long-term compressive loads, thereby optimizing the design of structural components and improving their service reliability.

The present application relates to the field of steam turbine technology, and specifically to a method and device for predicting creep bending of a steam turbine rotor. The temperature field and stress field of the rotor are calculated to obtain a first creep strain rate function and a first axial stress deviator function; a one-dimensional shafting model of the steam turbine unit is established, and the axial stress deviator correction function is calculated based on the dynamic load of each node of the one-dimensional shafting model; the first creep strain rate function and the first axial stress deviator function are corrected based on the creep characteristics of the rotor material and the axial stress deviator correction function to obtain a corrected second creep strain rate function; the second creep strain rate function is used as the initial strain, and the bending distribution of the rotor in each time step under a preset time step is calculated in sequence to obtain the creep bending prediction result of the steam turbine rotor in the preset time step. The present application adds dynamic load to obtain the corrected creep strain rate function, thereby making the creep bending prediction result more accurate.

This invention relates to a small punch test apparatus for studying the axial and circumferential creep of nuclear fuel cladding tubes. The apparatus, used to hold a sample of a nuclear fuel cladding tube, includes a lower die, a small punch, and an upper die. The lower die has a punched hole, and the upper die has a guide groove. The sample is located between the upper and lower dies, with the upper die pressing the sample against the lower die. The small punch passes through the guide groove and slides relative to it. The center of the sample is located between the small punch and the punched hole, and the position of the punch matches the movement path of the small punch. This invention also relates to a small punch test method for studying the axial and circumferential creep of nuclear fuel cladding tubes. By designing a small punch test apparatus for holding nuclear fuel cladding tubes, this invention accurately calculates the equivalent creep stress and equivalent creep strain of the nuclear fuel cladding tube, establishes a creep constitutive model, and achieves efficient and convenient research on the axial and circumferential creep behavior of nuclear fuel cladding tubes, belonging to the field of nuclear fuel cladding tube creep testing technology.

The application discloses a method for predicting the fatigue fracture times of wind turbine blade composite materials, comprising the following steps: preparing a plurality of wind turbine blade composite material samples, each sample being prepared with two parallel test samples; taking one parallel test sample of each sample to perform a creep performance test under preset test conditions; taking another parallel test sample of each sample to perform a fatigue performance test; fitting the relationship between the creep strain and the fatigue fracture times; for the wind turbine blade composite material to be tested, performing a creep performance test under the same test conditions to obtain the creep strain, and according to the obtained relationship, obtaining the predicted fatigue fracture times of the wind turbine blade composite material. The method can complete the fatigue performance test and evaluation in a short time, establish a linear correlation model of creep and fatigue, calculate the fatigue fracture data by testing the creep strain data, and experimental results show that the theoretical calculation data is very close to the data obtained by the tensile fatigue performance test.

The invention discloses a high-temperature-resistant creep-resistant die-casting magnesium alloy and a preparation method thereof, and relates to the technical field of non-ferrous metal materials. The high-temperature-resistant creep-resistant die-casting magnesium alloy is prepared from the following components in percentage by mass: 5.1 to 7.4 percent of Al, 0 to 6.5 percent of La, 0 to 6.5 percent of Ce (La + Ce = 4.4 to 6.5 percent), 0.1 to 0.5 percent of Sr, 0.001 to 0.5 percent of Sm, 0.15 to 0.35 percent of Mn, 0.01 to 0.3 percent of Zn, 0.001 to 0.05 percent of Y, 0.001 to 0.05 percent of Nd, 0.001 to 0.05 percent of Gd, 5 to 15 ppm of Be and the balance of Mg and impurity elements. Through alloy regulation and control, the high-temperature-resistant and creep-resistant magnesium alloy which is economical and effectively suitable for die casting is provided, and the creep strain capacity of the magnesium alloy is lower than 0.03% under the creep conditions of 105 DEG C, 60 Mpa and 50 h.