High-temperature discontinuous structure fatigue fracture prediction method based on phase field method under variable-temperature working condition
By introducing the coupling mechanism of temperature field and phase field damage variables and constructing a fully coupled solution system, the problem of damage prediction of viscoplastic phase field models under high temperature gradients is solved, and accurate fracture prediction of high-temperature discontinuous structures is achieved, which is suitable for life assessment and safety design of complex structures.
Patent Information
- Application Number
- CN202510714280.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-09-05
AI Technical Summary
Existing viscoplastic phase field models cannot effectively describe the viscoplastic response of materials under temperature gradients and the thermal-damage multi-field coupling under high temperature gradients, and it is difficult to accurately predict the damage initiation and crack propagation behavior under non-uniform temperature distribution environments.
A direct coupling mechanism between the temperature field and phase field damage variables is introduced to construct a fully coupled solution system for the stress-strain field, temperature field, and fracture phase field. The synchronous update and iteration of the three-field information are achieved through the built-in solver and subroutines of ABAQUS, and the material parameters are modified to simulate the influence of temperature on the inelastic response and damage evolution of the material.
It achieves accurate prediction of material damage initiation and crack propagation behavior under non-uniform temperature distribution environment, is suitable for damage analysis of complex structures, improves prediction accuracy, and provides life assessment and safety design tools for aviation components under high-temperature service conditions.