A method for predicting fatigue life of an arm support K-shaped structure with a flattened abdomen rod based on a response surface model and an S-N curve
By combining response surface methodology and SN curves with the method of flattening the web members, a fatigue life prediction model for the K-shaped structure of a crane boom was established. This solved the problem of difficult assessment in existing technologies, enabled rapid and effective fatigue life assessment, reduced the workload of inspection, and improved safety.
CN122287188APending Publication Date: 2026-06-26SHENYANG JIANZHU UNIVERSITY +1
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENYANG JIANZHU UNIVERSITY
- Filing Date
- 2026-03-02
- Publication Date
- 2026-06-26
AI Technical Summary
Technical Problem
Existing technologies make it difficult to quickly and effectively assess the fatigue life of crane truss boom structures, especially the assessment of the early stages of crack initiation, resulting in a huge workload for inspection and testing and unavoidable safety hazards.
Method used
By combining response surface methodology and SN curves with the method of flattened web members, a fatigue life prediction model for the K-shaped boom structure is established through finite element analysis. The hot spot stress concentration factor is calculated and a surrogate model is constructed to predict the fatigue life.
Benefits of technology
It enables rapid and efficient assessment of the fatigue life of crane booms, reduces the workload of inspection, and improves safety.
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Smart Images
Figure CN122287188A_ABST
Abstract
This invention belongs to the field of crane fatigue life estimation, specifically relating to a fatigue life prediction method for a K-shaped boom structure with flattened web members based on response surface modeling and S-N curves. The technical solution of this invention is as follows: A finite element model of the truss boom is established and the axial force of each member is calculated; a combination of geometric parameters characterizing the three-dimensional geometry of the K-shaped boom structure is proposed; a three-dimensional finite element model of the K-shaped structure with flattened web members is established to determine the most likely failure hotspots; based on the response surface model, a mathematical relationship is established between the stress concentration factor of the hotspots and the geometric parameters of the K-shaped structure; and combined with the hotspot stress and fatigue life S-N curves, a surrogate model of chord axial force-geometric parameters-fatigue life is established to achieve rapid assessment of the fatigue life of the K-shaped structure. The fatigue life prediction method for a K-shaped boom structure with flattened web members based on response surface modeling and S-N curves provided by this invention can quickly and efficiently predict the fatigue life of a truss crane boom K-shaped structure.
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