Inductive Hall Current Residual Stress Profiling
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Solution Overview
Problem
Existing methods for determining residual stress profiles in materials are limited by variability in material properties and stress factors, making it difficult to predict the remaining service life and detect flaws effectively.
Innovation Solution
A system and method using high frequency inductive sensing of a Hall current, involving alternating current injection electrodes and sensing coils, to measure the Hall coefficient, which is sensitive to charge carrier density and indicative of material properties like residual stress, elastic strain, and plastic strain, allowing for accurate residual stress profiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic NDE is used to detect residual stress profiles, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system segments the measurement function by separating current injection (via electrodes) from field sensing (via coils), allowing independent optimization of each subsystem while achieving comprehensive material characterization through multiple measurement modes
Solution Approach 2:
The electromagnetic NDE system achieves multi-functionality by using the same basic apparatus to perform residual stress profiling, conductivity measurement, permeability assessment, thickness gauging, and flaw detection, eliminating the need for separate specialized devices for each measurement type
2Measurement precision
If Hall coefficient measurement is used for residual stress assessment, then measurement precision is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The system replaces direct electrical contact measurement with inductive sensing using sensing coils that detect Hall currents wirelessly through electromagnetic induction, eliminating contact issues and reducing measurement difficulty while maintaining high precision
Solution Approach 2:
The sensing coils act as intermediaries between the Hall current source and the measurement instrument, transferring information through electromagnetic fields and enabling non-contact measurement that simplifies the detection process
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
Enables reliable detection of residual stress and separation of elastic and plastic strains, providing accurate material property determination and extending the service life prediction of materials in high-stress environments.
Implementation Method 1
inductively sensing, using a first sensing coil and a second sensing coil, a Hall current for the portion of the material
Implementation Method 2
a Hall current created by the alternating current and a magnetic field perpendicular to the alternating current
Data Source
Figure 1~2
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AI summary
A system may include a first injection electrode, a second injection electrode, a first sensing coil, and a second sensing coil. The first injection electrode and the second electrode may each be configured to contact a material and conduct an alternating current through a portion of the material. The first sensing coil and a second sensing coil may each be configured to inductively sense a Hall current created by the alternating current and a magnetic field perpendicular to the alternating current. The first sensing coil and the second sensing coil may be coupled in series.