3 results about "Hydrostatic stress" patented technology

The invention discloses a hydrogen diffusion evaluation method and device for an irregular corrosion defect pipeline, equipment and a medium, and relates to the technical field of oil and gas pipeline safety, a stress field calculation result of the irregular corrosion defect pipeline is obtained, the stress field calculation result is coupled with a hydrogen diffusion field, and a hydrogen diffusion model is established; generating a hydrogen concentration distribution cloud picture based on the hydrogen diffusion model, and analyzing the hydrogen concentration distribution cloud picture to obtain an association relationship between the hydrogen diffusion behavior and hydrostatic stress distribution; based on the incidence relation, hydrogen concentration distribution change curves under irregular defect shapes, regular and irregular defect shapes, corrosion defect lengths and corrosion defect depths of different morphologies are determined respectively; hydrogen diffusion evaluation is carried out on the irregular corrosion defect pipeline based on the hydrogen concentration distribution change curve, the problem that the diffusion behavior and the concentration distribution rule of hydrogen in a real defect area are difficult to accurately reflect is solved, the accuracy and reliability of hydrogen diffusion evaluation of the irregular corrosion defect pipeline are improved, and the safety of pipeline operation is improved.

This invention discloses a high-load-bearing backing bearing with a multi-layered composite wall thickness outer ring. The bearing's dynamic blocking transition layer is composed of polyhedral rigid microparticles and a viscoplastic matrix, with the microparticle volume fraction limited within a critical blocking threshold range. Under quasi-static radial heavy loads, the microparticles are in a blocked state, forming a rigid force chain that transmits hydrostatic stress. Under high-frequency transverse shear stress wave excitation, the matrix undergoes transient superplastic rheology, and the force chain enters a locally unblocked state, resulting in micro-rheology and a sudden drop in transverse shear stiffness. Based on the orthogonal decoupling of stress states and the dual-state phase transition characteristics, this invention actively disrupts the subsurface standing wave resonance condition, resolving the contradiction between macroscopic compressive strength and microscopic dissipation. This effectively suppresses deep peeling failure under high-speed, heavy-load conditions, and its material selection and process design fully embody the energy-saving and high-efficiency concept of green manufacturing.

The application relates to a micro-nano metal sintering connection layer mesostructure evolution and stress migration behavior simulation method, which comprises the following steps: establishing a chip-sintering connection layer-substrate simulation model, and establishing a second layer unit model of the sintering connection layer for phase field simulation; using a random number generation and Gaussian filtering method, a binary matrix representing a porous structure is generated, and initial values of the phase field are obtained; a first control equation of the phase field describing pore evolution is established, and then the second control equation is obtained by considering the atom migration driven by the hydrostatic stress gradient; thermal coupling simulation is carried out, the node hydrostatic stress is calculated from the simulation result and input into the second layer unit model; phase field simulation is carried out, the second control equation is iteratively solved, and the evolution and migration results of the sintering connection layer mesostructure are obtained. The application can establish a micro-nano metal sintering connection layer mesostructure evolution and stress migration behavior simulation method, and provide support for studying the evolution of the mechanical and heat transfer characteristics of the sintering connection layer.