Fatigue life prediction method for friction stir welded component based on small crack propagation
Patent Information
- Authority / Receiving Office
- CN Β· China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING UNIV OF TECH
- Publication Date
- 2018-11-30
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Abstract
Description
technical field
[0001] The invention relates to a method for predicting fatigue life, in particular to a method for predicting fatigue life of a friction stir welded component based on small crack propagation, and belongs to the technical field of fatigue diagnosis and analysis of mechanical structures. Background technique
[0002] For friction stir welded components, the welded joint is the weakest part of the entire structure, and the main failure mode of welded components is fatigue fracture. Fatigue specimens undergo the process of crack initiation, small crack growth and long crack growth. Among them, the initiation and propagation stages of small cracks account for about 70% to 80% of the fatigue life. In most cases, the sample is damaged due to initial microscopic defects such as inclusions, hardened particles, and micro-holes inherent in the material itself, or due to collisions, nicks, and corrosion during processing. For friction stir welded joints, the initiati...