一种基于能量耗竭理论的增材制造材料疲劳寿命预测方法
By combining the energy depletion theory and the linear cumulative damage rule with fatigue tensile tests of additive manufacturing materials, a functional relationship between the energy depletion rate and the critical value was established, which solved the error problem in the life prediction of additive manufacturing parts and achieved accurate fatigue life prediction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NANCHANG UNIV
- Filing Date
- 2022-12-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing fatigue life prediction methods have significant errors under additive manufacturing technology and cannot accurately predict the life of parts, mainly due to the large dispersion of life caused by the microscopic defects of additively manufactured parts.
A fatigue life prediction method based on energy depletion theory and linear cumulative damage rule is adopted. By conducting fatigue tensile tests at the same test temperature, the energy depletion rate and critical value are obtained by calculating the hysteresis loop area. A functional relationship between the number of cycles and the amount of energy depletion is established. Combining the plastic strain rate and the maximum energy depletion critical value, the fatigue life is predicted using the linear cumulative damage rule.
It enables accurate life prediction of additive manufacturing materials under fatigue, taking into account the effects of maximum stress and plastic strain rate in the steady-state stage. It has clear physical meaning, and the parameters are easy to extract, enabling rapid and efficient life prediction.
Smart Images
Figure CN115931609B_ABST