Curved Surface Residual Stress Measurement Using X-Ray Diffraction
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Solution Overview
Problem
Existing residual stress measurement technologies, such as the X-ray diffraction method, are not suitable for measuring residual stress on curved surfaces due to measurement errors and numerical distortions caused by the shape of the material.
Innovation Solution
A method for measuring residual stress on curved surface blocks using an instrument integrating an X-ray light source and a detector, combined with the sin2 Ψ method, to locate the point of highest curvature on the block and calculate residual stress using a mathematical expression that accounts for the block's curvature and material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the X-ray diffraction method is used for residual stress measurement, then non-contact measurement capability is improved, but measurement precision deteriorates due to curvature effects
Solution Approach 1:
The patent modifies the standard X-ray diffraction measurement parameters by introducing curvature-specific correction factors and adopting a sin²ψ method with adjusted measurement angles. The measurement model incorporates curvature radius (R) and measurement point position (x) as additional parameters to compensate for geometric deviations, thereby maintaining measurement precision on curved surfaces while preserving the non-contact advantage
Solution Approach 2:
The patent introduces a specialized measurement model as an intermediary between the X-ray diffraction method and curved surface measurement. This model includes curvature correction algorithms and position-dependent calculation formulas that act as mediators to translate standard X-ray diffraction data into accurate residual stress values for curved geometries
2Adaptability or versatility
If the original analysis model is used for curved surface measurement, then measurement coverage is improved, but measurement precision deteriorates due to shape effects
Solution Approach 1:
The patent applies local quality by developing position-specific measurement models that account for the local curvature characteristics at each measurement point. The measurement approach divides the curved surface into zones with different curvature radii and applies appropriate correction formulas for each zone, thereby maintaining high precision across the entire curved surface while expanding measurement coverage
3Adaptability or versatility
If measurement is performed on curved surfaces, then adaptability to product designs is improved, but measurement precision deteriorates due to numerical distortion
Solution Approach 1:
The patent implements dynamic measurement strategies that adapt to the specific curvature characteristics of each workpiece. The measurement model dynamically adjusts measurement angles, step sizes, and correction factors based on real-time identification of curvature radius and surface geometry, enabling accurate residual stress measurement across diverse curved product designs while compensating for numerical distortion effects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method reduces measurement errors and enhances accuracy by effectively controlling geometrical features and eliminating errors caused by deviation of the residual stress measurement point on the curved surface, making it suitable for measuring residual stress on curved surfaces.
Implementation Method 1
Measuring the to-be-detected point by using an X-ray diffraction theory
Implementation Method 2
the principle of residual stress measurement of the X-ray diffraction method is that material lattices deformed by the stress
Data Source
AI summary
A residual stress measurement method of a curved surface block includes steps of: locating a point at which a to-be-detected curved surface of a curved surface block has a highest curvature as a to-be-detected point; applying an instrument integrating an X-ray light source and a detector, measuring the to-be-detected point by using an X-ray diffraction theory, and analyzing and calculating, in combination with a sin2 Ψ method, a strain value measured by using the instrument; and calculating, in combination with material property measurement data of the curved surface block material, a residual stress by introducing a curved surface block residual stress calculation model.