7 results about "Hydrogen damage" patented technology

The application discloses a hydrogen-doped natural gas transportation safety risk assessment method and system, relates to the technical field of hydrogen-doped natural gas pipeline safety monitoring, and comprises the following steps: initializing a safety situation assessment engine and injecting gas components; collecting pipeline strain vibration through a distributed optical fiber sensor, identifying low-frequency noise characteristics caused by hydrogen-induced material changes; superimposing and reconstructing in combination with historical corrosion crack maps to generate a mixed risk map and divide risk sections; calculating the combustible migration rate of mixed gas and the cumulative fatigue reduction coefficient of the pipeline wall material in each risk section; and quantifying risk entropy values by comprehensively considering both, thereby generating a differentiated maintenance strategy. The method can realize early identification of hydrogen damage to pipeline materials in a hydrogen-doped environment, and realizes accurate positioning and assessment of risks by fusing historical defect information, thereby providing technical support for active safety maintenance of the pipeline.

This invention discloses a system and method for monitoring the hydrogen damage state of metals, comprising: a hydrogen charging device for electrochemically charging a plate-shaped sample of the same metal as the target metal that has not undergone hydrogen damage; a hydrogen permeation measuring device for converting hydrogen atoms permeating into the sample into hydrogen ions during the hydrogen charging process and measuring the current generated by the free electrons produced during the conversion process in real time to obtain a hydrogen permeation curve; and an ultrasonic measuring device for emitting ultrasonic guided waves to the sample during the hydrogen charging process and receiving the nonlinear response signal generated by the guided waves exciting ultrasonic waves inside the sample, and then performing cepstral analysis on the received signal to obtain the nonlinear coefficients at different time periods. Based on this, combined with the hydrogen permeation curve, the correlation between the nonlinear response signal and the degree of hydrogen damage is determined, and then the nonlinear response signal of the target metal is substituted into the correlation to obtain the hydrogen damage state inside the metal. This invention can monitor and evaluate the degree of hydrogen damage inside metals in real time.

A simulation method for failure behavior of a geological hydrogen storage well pipe string based on fracture and hydrogen diffusion theory, characterized in that: the mechanical behavior experiments of the geological hydrogen storage well pipe string in the presence or absence of hydrogen environment are carried out, the fracture strain, fracture energy, hydrogen concentration and distribution, hydrogen penetration depth and stress-strain constitutive relationship of the pipe string material under different hydrogen charging times are obtained; based on the test data, the VUSDFLD subroutine is developed to calculate the hydrogen coverage, wherein the hydrogen concentration distribution control module along the pipe string wall thickness direction, the static water stress accelerated hydrogen diffusion module and the result output module need to be constructed; a three-dimensional finite element mechanical model of the geological hydrogen storage well pipe string is established, the flexible damage and burst failure criterion is used to simulate the elastic-plastic deformation, crack propagation and burst mechanical behavior of the geological hydrogen storage well pipe string, the influence law of hydrogen distribution characteristics and stress accelerated hydrogen diffusion on the failure behavior of the pipe string is analyzed, and the hydrogen damage mechanism and ultimate bearing pressure prediction of the pipe string under the synergistic action of high internal pressure and hydrogen penetration are realized.

This invention provides a hydrogen pipeline damage state detection system and method based on nonlinear ultrasound. The system's nonlinear ultrasonic detection device includes a signal excitation module and a waveform receiving module. The signal excitation module uses pulsed ultrasonic signals to ultrasonically excite the test sample, achieving non-contact ultrasonic propagation to acquire the vibration signal of the detection response. The waveform receiving module analyzes the nonlinear response waveform information. The feature parameter calculation module is configured to calculate state feature parameters based on the nonlinear response waveform information. The evaluation matrix formulation module establishes hydrogen damage identification criteria based on the correlation between state feature parameters and hydrogen damage status. Furthermore, the hydrogen damage assessment module comprehensively evaluates and provides early warning of the pipeline's hydrogen damage status based on the hydrogen damage identification matrix combined with the state feature parameters of the detection response. This approach overcomes the limitations of existing technologies in terms of application scenarios and accuracy, providing a comprehensive and reliable evaluation of hydrogen damage status.

Disclosed in the present invention are a vanadium-containing high manganese steel, and a preparation method therefor and the use thereof. By combining chemical components with a controlled rolling process, the steel exhibits an excellent ultra‑low‑temperature resistance and a strong resistance to hydrogen damage, while avoiding the addition of multiple precious metal elements and simplifying the process. The present application has wide application prospects and is more suitable for manufacturing storage and transport containers for ultra-low temperature media in complex environments.

This invention discloses a method, system, medium, and device for predicting the degree of hydrogen damage in steel, relating to the field of metal material damage detection technology. The method includes: constructing an experimental dataset of ultrasonic hydrogen damage in high-strength steel; constructing a numerical mechanism model of hydrogen damage and a numerical mechanism model of ultrasonic wave transmission to generate a simulation dataset of ultrasonic physics for hydrogen damage in high-strength steel; performing continuous wavelet transform on the experimental and simulation datasets to determine the corresponding time-frequency features, and constructing a feature alignment network based on an attention mechanism to fuse the time-frequency features and determine a hybrid feature vector; constructing and training a physical information neural network (PINN) with dual-channel input to obtain a prediction model for predicting the degree of hydrogen damage in steel.

The application provides a high-pressure hydrogen environment hydrogen damage risk online monitoring method and system, and the method comprises the following steps: obtaining a hydrogen permeation parameter of a metal material to be monitored, and screening a first parameter meeting a first preset condition from the hydrogen permeation parameter; substituting the first parameter into a previously established high-pressure hydrogen permeation characteristic parameter and high-pressure hydrogen damage characteristic parameter relationship model to obtain a fracture toughness ratio of the metal material; and determining a high-pressure hydrogen environment hydrogen damage risk grade of the metal material to be monitored according to the fracture toughness ratio of the metal material. The technical scheme provided by the application can simply and effectively find the hydrogen damage problem of the metal material in the high-pressure hydrogen environment, and has great significance for the service safety of the metal material in the high-pressure hydrogen environment.