12 results about "Strength design" patented technology

The present application relates to the technical field of high-temperature structural component fatigue strength design and life assessment, and particularly relates to a low-cycle multi-axial fatigue life prediction method based on powder high-temperature alloy damage mechanism. The method comprises: for the dangerous point of the component under non-isothermal multi-axial cyclic loading, calculating pure fatigue damage, pure creep damage and fatigue-creep interaction damage caused by a single load cycle; accumulating the pure fatigue damage, the pure creep damage and the fatigue-creep interaction damage to obtain the total damage of the single load cycle; taking the inverse of the total damage to predict the total failure life of the component under non-isothermal multi-axial cyclic loading. The method of the present application realizes effective prediction of the low-cycle multi-axial fatigue life of the powder high-temperature alloy component by accurately decomposing the damage of the dangerous point under non-isothermal multi-axial cyclic loading, can more truly reflect the comprehensive prediction model of the failure physics of the powder high-temperature alloy under multi-axial thermal mechanical loading, and improves the accuracy and reliability of the life assessment.

This invention discloses a method for calculating and verifying ductile fracture parameters of metallic materials, belonging to the field of mechanical property analysis technology for metallic materials. Initial equivalent plastic strain is obtained through tensile testing of standard test bars. Stress triaxiality is calculated using CAE static simulation, and fracture energy is calibrated through explicit dynamic necking simulation. These three sets of core parameters are directly applied to the simulation prediction of actual parts. Finally, physical experiments are conducted with unified constraint loading for calibration, forming a complete closed-loop process. This invention standardizes mesh generation, analysis step settings, and constraint loading methods, eliminating manual value selection and simulation distortion problems. Parameter calibration can be completed with only a single set of test bar experiments, and the test bar parameters can be directly transferred to complex parts. This method simplifies the experimental process, reduces R&D costs, achieves a fracture force prediction accuracy of 85%, and the fracture location is consistent with the experiment. It is applicable to ductile fracture simulation of most metallic materials and can accurately guide part structural optimization and strength design.

This invention belongs to the field of mining engineering technology, specifically relating to a dynamic design method and system for backfill strength based on a three-dimensional geological model. The system constructs and converts a three-dimensional geological model into a volumetric model, generating theoretical stress maps using numerical simulation. It then combines real-time monitoring data with dynamic coupling analysis and parameter inversion to correct the model. A dynamic decision-making module for backfill strength calculates the critical strength based on the corrected indicators and generates a mix design scheme. An execution module then issues instructions and performs closed-loop optimization. This application solves the problem that backfill strength design cannot respond in real-time to complex mining-induced stress fluctuations, realizing a shift from static to dynamic precision in strength design. While preventing backfill instability risks and enhancing safety, it significantly reduces support costs and resource waste.

This invention relates to the field of tunnel and underground engineering design technology, specifically to a method for identifying weak areas in tunnels and providing differentiated support based on asymmetric load evolution. The method involves collecting pressure distribution and deformation data of the tunnel cross-section and constructing a continuous arc-length coordinate system along the neutral axis of the support structure. Based on the data and coordinate system, the geometric, stress, and energy states of the tunnel cross-section are analyzed to obtain geometric deformation analysis results, eccentricity evaluation results, and toughness judgment results at any point on the support section. A multi-index collaborative judgment model is constructed based on the above multi-dimensional index results to generate a weighted index distribution map of the tunnel cross-section's weakness. Based on the multi-dimensional results and the index distribution map, differentiated support decisions for the tunnel are designed. This invention identifies weak areas in tunnel support based on multi-dimensional physical indicators of deformation, stress, and energy, and conducts asymmetric differentiated support parameter decisions, realizing the transformation from traditional equal-strength design to asymmetric targeted support, thereby enhancing the stability and safety of the eccentrically loaded side structure.

The present application belongs to the technical field of geotechnical engineering, and discloses a reinforced soil retaining wall's reinforcement material down pull testing device and testing method. The rolling friction force between the roller and the longitudinal beam at the back end of the model box replaces the sliding friction force of the direct contact between the retaining wall module and the longitudinal beam at the back end of the model box. There is no contact between the existing retaining wall and the side wall of the model box, so there is no friction force between them. When monitoring the down pull of the reinforcement material, the loss caused by the friction force is effectively reduced. The down pull obtained by the present application can provide clear evidence for the strain concentration phenomenon at the connection between the reinforcement material and the existing retaining wall, and promote the innovation of the reinforcement material strength design method. The total down pull obtained by the testing can be used as an exact and additional load, which is input into the calculation of the stability of the existing retaining wall foundation, and is used for evaluating the stability and deformation of the bearing capacity of the foundation under the existing retaining wall.

The application discloses a full-precast steel shell combined bridge tower segment connecting structure, which is used for connecting precast segments of a steel shell combined bridge tower, the precast segment comprises a steel shell and precast concrete, the steel shell comprises inner wall plates and outer wall plates, the inner wall plates and the outer wall plates are uniformly provided with a plurality of vertical stiffening ribs on opposite surfaces, and the two ends of the precast segment are respectively provided with a positioning groove and a wedge-shaped positioning block; the connecting structure comprises an upper precast segment and a lower precast segment, the positioning block of the upper precast segment is embedded into the positioning groove of the lower precast segment; the vertical stiffening ribs at the upper end and the lower end of the precast segment respectively extend in a direction away from the steel shell to form extension sections, the extension sections are provided with connecting pieces, the extension sections at the upper part of the lower precast segment and the extension sections at the lower part of the upper precast segment are staggered when the segments are spliced, a ring-shaped wet joint cavity is formed between the upper and lower precast segments, and wet joint concrete is poured into the wet joint cavity. The application realizes equal-strength design of a segment connecting area, reliable force transmission, and significantly improves construction efficiency and quality.

This application discloses a turbine blade strength design method and system, belonging to the field of blade strength design technology. The turbine blade strength design method includes the following steps: establishing a blade airfoil model, wherein the center of the stacking axis of the blade in the airfoil model coincides with the centroid of the blade; determining and obtaining the execution tolerance of the blade based on the airfoil model; establishing a tolerance influence assessment calculation model based on the execution tolerance; and optimizing the blade airfoil model based on the tolerance influence assessment calculation model. This improves the accuracy of determining and obtaining the execution tolerance, and enables theoretical analysis of the execution tolerance of the blade airfoil during forward design. It avoids the problem that the execution tolerance influence exceeds the reserve coefficient required by the blade design criteria during actual production, reduces the risk of fatigue fracture of the blade, improves the actual life of the blade, and ensures that the strength of the turbine blade meets the actual requirements of strength design and engineering production.

The application belongs to the technical field of steel material application, and discloses a method for improving the cementing performance of AlSi plated sheet after hot forming. The method comprises the following steps: (1) surface mechanical treatment: after the hot forming of the AlSi plated sheet, the surface of the steel sheet to be connected is impacted by silicon carbide or alumina particles with a particle size of 60-120 mesh; (2) surface cleaning: after removing the contaminants on the surface of the sheet by acetone or ethanol, the sheet is washed with clean water and dried; (3) gluing: structural glue is applied, and after the application, the structural glue is compacted to prepare a pull-shear joint; (4) curing and tensile test: the joint is cured at 180±10 DEG C for 25-30 min, and after the curing, a static tensile test is carried out at a tensile rate of 5 mm / min. According to the application, the surface of the hot-formed AlSi plated sheet is mechanically treated, the influence of micro-cracks on the cementing performance is overcome, the selection of structural glue, the thickness of the glue layer and the curing parameters are designed, the pull-shear performance of the cementing joint of the hot-formed AlSi plated sheet is improved, and the strength design requirements of the joint of the automobile structural part are met.

This invention relates to a steam generator joint strength design method and system based on a linear matching method. The method includes: obtaining design parameters of the tube sheet joint; obtaining mechanical property parameters of different material types of the tube sheet joint under different temperature loads; obtaining the expanded joint model; obtaining the temperature field distribution of the tube sheet joint in each operating condition; importing information such as load conditions and material properties to establish a cyclic finite element model; conducting finite element analysis under service conditions based on the linear matching method to obtain the stress-time curve and strain-time curve of the tube sheet joint in steady-state cycles; determining the most dangerous location of the tube sheet joint; determining the creep damage at the most dangerous location in steady-state cycles; determining the fatigue damage at the most dangerous location in steady-state cycles; determining the allowable creep-fatigue cycles at the most dangerous location; and determining whether the tube sheet joint meets the creep-fatigue strength design requirements.

The application discloses a kind of helicopter equipment mounting bracket strength design method considering vibration environment, according to the equipment installation area on helicopter, determine the main excitation frequency and the maximum amplitude of vibration that equipment support is expected to withstand;Vibration load under the corresponding maximum amplitude is loaded to the center of gravity of equipment, the maximum static stress of equipment mounting bracket is calculated using finite element method, and then the equivalent dynamic stress of equipment mounting bracket under the vibration environment of helicopter is obtained;Obtain the total cycle number of fatigue by comparing the S-N curve of material, and the simplified high-cycle fatigue life of equipment mounting bracket is obtained according to frequency calculation.The application can make equipment mounting bracket better adapt to the vibration environment of helicopter, and avoid structural cracks.

The application relates to the technical field of structural strength design, and discloses a whole-ring stator blade vibration reduction design method and system. A dangerous mode is identified by performing modal analysis on an analysis model of a whole-ring stator blade. An analysis model of total vibration response coefficients of the whole-ring stator blade is constructed by analyzing vibration response coefficients of the stator blade under all dangerous modes. The total vibration response coefficients of the blade are minimized by adjusting stacking rules of the blade, so that the probability of high-cycle fatigue damage of the blade is reduced. The application can change vibration response characteristics of the blade by adjusting the stacking rules of the blade without affecting aerodynamic performance and increasing the weight of the blade, so as to achieve the purpose of reducing vibration stress, effectively improve the high-cycle fatigue resistance of the whole-ring stator blade, and further improve the safety, economy and maintainability of the engine.

The application provides a strength design method of a large non-uniformly reinforced cylindrical shell pressure-resistant structure, which comprises the following steps: (1) stress analysis is conducted on the reinforced cylindrical shell structure subjected to external hydrostatic pressure; (2) based on the elastic foundation beam theory, a cylindrical shell deflection curve expression containing unknown parameters is constructed; (3) according to the boundary conditions at the reinforcing ribs of each section of the cylindrical shell, the unknown parameters in the cylindrical shell deflection curve expression are solved to obtain a calculation formula of the cylindrical shell deflection curve, and the strength of the non-uniformly reinforced cylindrical shell pressure-resistant structure is calculated in combination with actual material parameters and structure parameters. The application has reasonable concept, breaks through the limitations of traditional methods, has a wider application range than traditional theoretical methods, can conveniently and quickly design the strength of the non-uniformly reinforced cylindrical shell structure, and is suitable for promotion and application.