6 results about "Intensity factor" patented technology

The present application belongs to the technical field of wind power generation, and specifically relates to a wind power tower material crack propagation prediction method and system, which is suitable for fatigue life evaluation of large supporting structures in the wind energy industry. The method comprises: deploying a multi-source heterogeneous sensor network to collect strain, acoustic emission and environmental load data; constructing a digital twin high-fidelity finite element submodel to obtain a dynamic stress intensity factor; constructing a deep neural network, embedding the Paris law of fracture mechanics in the form of residual into the loss function to form a physical information neural network, and realizing crack propagation rate prediction; using the extended finite element method combined with the level set function and the maximum circumferential stress criterion to dynamically track the three-dimensional space expansion path of the crack; combining Monte Carlo simulation and recursive Bayesian update to evaluate the remaining life and trigger graded early warning. The present application solves the problems of insufficient fusion of physical mechanisms and data-driven in the prior art, low prediction accuracy under small samples, and lack of crack space path tracking.

This invention discloses a method for predicting crack propagation path and remaining life of a notched component with irregular cracks, comprising: designing a notched feature specimen of the notched component with irregular cracks based on the principle of local stress field consistency; establishing a three-dimensional model of the notched feature specimen in ABAQUS and establishing an interface connection between ABAQUS and the three-dimensional crack propagation simulation platform Franc3D to perform dynamic simulation of crack propagation and obtain opening, shear, and tearing stress intensity factors; calculating a composite equivalent stress intensity factor as a measure of crack propagation based on the opening, shear, and tearing stress intensity factors obtained from the simulation, and extracting the composite equivalent stress intensity factor at the leading edge point with the largest increment; estimating fatigue crack propagation life based on the composite equivalent stress intensity factor at the leading edge point with the largest increment; and fitting a crack propagation curve based on the stress-life curve and the fatigue crack propagation life expression. This invention effectively improves the prediction accuracy of crack leading edge trajectory and the accuracy of crack propagation life assessment.

The application discloses a method for improving the fracture plugging effect of drilling fluid by combining a three-pore medium flow model with dislocation fracture mechanics, and comprises the following steps: inputting a parameter set, constructing a three-pore medium flow model, configuring a solving mode, and solving and calculating to obtain the fluid pressure p in the fracture f , distributing simulation results, constructing an equation group by writing program codes, importing p f data, running the program, calculating a dislocation distribution function f(t k ), and further obtaining a fracture width W(t k ), a fracture tip stress intensity factor K I ; the fracture intensity factor K I under different conditions is obtained by modifying parameters, a K I vs. related parameter graph is drawn, a toughness coefficient K IC of a target formation is imported, for example, K IC >= K I , which indicates that the fracture will continue to expand; the fracture width and fracture re-expansion during the drilling process are predicted in real time, the plugging material is reasonably designed, the one-time plugging success rate of the fracture leakage is improved, and the continuous leakage and malignant leakage are avoided.

This application discloses a method, device, storage medium, and program product for safety performance assessment of cracked jacket structures, belonging to the field of offshore wind power structural health monitoring and safety assessment technology. By real-time acquisition of strain field data and environmental loads, and combining this with a digital twin model of the cracked jacket structure, a first real-time stress intensity factor is obtained. By comparing the first real-time stress intensity factor with the current effective stress intensity, the model parameters of the digital twin model of the cracked jacket structure are updated, overcoming the limitation of traditional static models that cannot dynamically reflect crack propagation and structural performance degradation. Therefore, continuous, real-time perception and accurate assessment of the safety status of cracked jacket structures are achieved, providing a basis for timely detection of risks associated with cracked jacket structures.

This invention belongs to the field of reservoir development technology, specifically providing a method for simulating fracture networks in deep coal and rock fracture systems, including the following steps: S1, calculating key rock mechanics parameters and geostress parameters of deep coal and rock based on well logging interpretation data; S2, calculating equivalent rock mechanics parameters and equivalent geostress parameters of deep coal and rock; S3, calculating the equivalent stress intensity factor at the fracture tip and the critical stress for fracture initiation; S4, based on the equivalent stress intensity factor at the fracture tip and the critical stress for fracture initiation, simulating the fracture morphology, length, and branch fracture density using a lightning simulation-based fracture propagation calculation method; this invention solves the problem of low accuracy in existing deep coal and rock hydraulic fracturing fracture propagation methods. The fracture morphology, length, and branch fracture density simulated by this invention are highly consistent with electromagnetic waves and data ranges, laying the foundation for subsequent research on the propagation morphology of hydraulic fractures in coal and rock formations.

The application discloses a rock dynamic fracture I-type stress intensity factor calculation method, system and device, relates to the rock dynamics technical field, and the method comprises the following steps: collecting an image sequence of a granite test piece with a straight cut groove in a Brazilian disc through a dynamic impact test on the granite test piece; performing semantic segmentation on the image by using a Mask2former model, identifying a crack region, and automatically positioning a crack tip position at each moment based on a segmentation result; processing the image sequence based on a DIC method to obtain displacement field data of a test piece surface; determining a displacement field sub-region participating in calculation in a Williams equation based on the crack tip position and the displacement field data; and iteratively solving the I-type dynamic stress intensity factor based on a least square method by adjusting the shape and size of the displacement field sub-region, so that the measurement accuracy and efficiency of the dynamic stress intensity factor are significantly improved.