Orthogonal Force Measurement for Thin Film Fracture Detection
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Solution Overview
Problem
Conventional techniques for determining the fracture point of thin film coatings during scratch tests face challenges due to inconsistent results from changing coefficients of friction and small, asymmetrical fractures, making it difficult to achieve reproducible patterns across multiple samples.
Innovation Solution
A method involving the application of normal and coaxial forces with a scratch probe to evaluate the performance of thin film coatings by monitoring the orthogonal force, which provides consistent and reproducible measurements for identifying the fracture point, regardless of the coating's type or geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If friction analysis or visual observations are used to identify the fracture point, then the fracture point can be detected, but the results are inconsistent and not reproducible across multiple samples
Solution Approach 1:
The patent replaces conventional friction analysis and visual observation methods with orthogonal force measurement. Instead of relying on friction coefficients or microscope observations, the invention uses a force sensor to measure forces orthogonal to the scratch direction, providing a more reliable and reproducible indicator of fracture points across multiple samples.
Solution Approach 2:
The patent introduces orthogonal force measurement as an intermediary parameter to detect fracture points. Rather than directly observing friction or visual changes, the invention uses orthogonal force as a mediator that reliably indicates fracture events, improving consistency across measurements.
2Difficulty of detecting and measuring
If conventional scratch testing with friction analysis is used, then the fracture point can be identified, but small asymmetrical fractures are difficult to detect accurately
Solution Approach 1:
The patent replaces visual observation and friction analysis with orthogonal force measurement. This mechanical measurement approach is more sensitive to small asymmetrical fractures than visual methods, allowing accurate detection of fracture points even when fractures are too small to be clearly seen under a microscope.
3Strength
If the normal force is ramped up during scratching, then the fracture point indicates critical normal force for performance rating, but the changing coefficient of friction makes fracture point determination difficult
Solution Approach 1:
The patent introduces orthogonal force measurement as an intermediary indicator that simplifies fracture point determination during ramped normal force testing. Instead of analyzing complex friction behavior or visual changes, the orthogonal force provides a clear, direct signal of fracture events, reducing the complexity of determining the critical normal force.
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 approach allows for accurate and dependable fracture detection, even in softer materials and coatings with small cracks, offering improved resolution and consistency compared to traditional methods like friction analysis and visual observations.
Implementation Method 1
due to a changing coefficient of friction, it is often difficult to determine the fracture point using friction analysis
Data Source
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AI summary
A method for evaluating a performance of a substrate surface including applying a normal force with a probe to a surface of a substrate, the normal force being substantially perpendicular to the surface, and moving the probe across the surface to generate a force against and to scratch the surface, the force being substantially parallel to the surface and comprising a coaxial force along the scratch and an orthogonal force perpendicular to the scratch. The method further includes measuring a magnitude of the orthogonal force as the probe moves across the coating, and determining a fracture point of the surface by the probe based on changes in the magnitude of the orthogonal force.