Aspirated Ink Pattern for Digital Image Correlation
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Solution Overview
Problem
Existing strain measurement techniques using stochastic patterns with standard paints face issues with adhesion failure and light saturation, leading to inaccurate displacement tracking in digital image correlation systems.
Innovation Solution
An ink aspiration system from a permanent marker is used to apply a stochastic ink pattern with metallic particles, providing a flat, non-glossy appearance that enhances video imaging and displacement tracking accuracy by utilizing inks with high adhesion and low cohesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard paints are used to apply stochastic pattern, then the pattern can be applied to material surface, but the paint adhesion fails and causes inaccurate displacement tracking
Solution Approach 1:
The patent changes the material parameter from standard paint to permanent marker ink, which has fundamentally different adhesion and cohesion properties. The ink's high adhesion to substrate and low internal cohesion creates a pattern that reliably transfers surface displacement without adhesion failure, resolving the contradiction between pattern reliability and measurement precision.
2Ease of manufacture
If permanent marker ink is applied by surface contact, then the pattern can be applied easily, but the ink creates hi-gloss/reflective appearance that causes light saturation in DIC cameras
Solution Approach 1:
The patent uses a spray mechanism to apply the ink pattern, which atomizes the ink and deposits it in a controlled manner. This pneumatic/hydraulic application method maintains the ease of application while controlling the ink deposition to achieve the desired non-glossy finish without excessive light reflection.
Solution Approach 2:
The spray application uses a mist or aerosol of ink particles rather than a full coating, applying just enough ink to create the stochastic pattern while avoiding excessive buildup that would create gloss. This partial action approach achieves the pattern with minimal reflective properties.
3Ease of manufacture
If spray can or paint gun applicators are used to apply paint, then the stochastic pattern can be created, but the paint has high cohesion that prevents accurate transfer of material displacement
Solution Approach 1:
The patent fundamentally changes the material parameter from paint to permanent marker ink, which has opposite cohesion characteristics. The ink's low internal cohesion prevents it from deforming with the substrate, ensuring that the pattern remains stable while still transferring displacement information accurately to the DIC system.
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
The method significantly increases accuracy and reliability in strain measurement by ensuring precise transfer of substrate material movement and minimizing adhesion failures, allowing for higher precision in displacement tracking.
Implementation Method 1
a system for aspirating ink from a permanent marker and spraying it onto a material surface in a stochastic pattern
Implementation Method 2
aspirating ink from a permanent marker and spraying it onto a material surface
Data Source
AI summary
A system for strain testing employs an ink aspiration system adapted to apply a stochastic ink pattern. The stochastic pattern is applied to a test article and a test fixture receives the test article. A digital image correlation (DIC) imaging and calculation system is positioned relative to the test article to image the stochastic ink pattern.