Thermal Digital Image Correlation for Composite Fiber Orientation
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Solution Overview
Problem
Current methods for analyzing fiber orientations and mechanical properties of composite materials are laborious, destructive, and limited to small spatial domains, hindering the validation of performance at the part scale and the adoption of lightweight, energy-efficient materials for structural applications.
Innovation Solution
The method employs Thermal Digital Image Correlation (TDIC) to assess fiber orientations and mechanical properties by exposing composite materials to temperature changes, imaging at multiple time points, and analyzing the resulting thermal deformations and strain patterns, allowing for non-destructive evaluation of large composite parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current orientation measurement techniques are used, then measurement precision is achieved, but productivity is reduced due to laborious and destructive processes
Solution Approach 1:
The patent replaces mechanical/destructive measurement methods with thermal field-based optical measurement. By applying temperature changes and using digital image correlation to track thermal deformation patterns, the system achieves non-destructive orientation assessment that is both rapid and precise, eliminating the need for laborious physical sampling and destruction of composite materials.
Solution Approach 2:
The patent changes the measurement parameter from direct physical inspection to thermal response characterization. By monitoring how composite materials respond to temperature changes through digital imaging, the system extracts orientation information from thermal deformation patterns, enabling rapid non-destructive assessment that maintains measurement precision while dramatically improving productivity.
2Measurement precision
If current measurement techniques are used, then local orientation data is obtained, but area of assessment is limited to small spatial domains
Solution Approach 1:
The patent creates a universal measurement system that can assess both local and global orientation characteristics using the same thermal digital image correlation approach. The method works across different spatial scales by capturing thermal deformation patterns that reflect fiber orientation at both point-specific and part-wide levels, eliminating the need for multiple measurement techniques for different spatial domains.
Solution Approach 2:
The patent transitions from two-dimensional local surface measurements to three-dimensional thermal field mapping across the entire composite part. By using thermal imaging to capture temperature distribution and deformation patterns throughout the volume, the system achieves comprehensive spatial coverage while maintaining local measurement precision through the thermal response characteristics.
3Measurement precision
If destructive measurement methods are used, then fiber orientation is determined, but reliability of part performance validation is reduced
Solution Approach 1:
The patent replaces destructive mechanical measurement methods with non-destructive thermal-optical measurement. By using digital image correlation to track thermal deformation patterns, the system determines fiber orientation without damaging the composite material, thereby maintaining both measurement precision and the reliability needed for valid part performance assessment.
Solution Approach 2:
The patent enables the composite material to reveal its own orientation characteristics through its natural thermal response. By applying temperature changes and observing the material's self-generated thermal deformation patterns, the system extracts orientation information without external destruction, preserving the material's integrity and ensuring reliable performance validation.
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 enables rapid, non-destructive assessment of fiber orientations and mechanical properties over large areas, facilitating quality control and predictive thermal and mechanical behavior, thereby accelerating the development and commercialization of composite materials.
Implementation Method 1
exposing the composite material to a temperature change... monitoring a surface mechanical strain tensor while the composite material is undergoing a temperature change
Data Source
AI summary
Methods for assessing fiber and bundle orientations and mechanical properties of fiber reinforced composite materials using Thermal Digital Image Correlation (TDIC) are disclosed. In some examples, the method comprises exposing the composite material to a temperature change; imaging the composite material at a plurality of time points before, during and/or after the temperature change; and assessing the characteristic of the composite material based on the imaging. In others, temperature changes naturally occur during the cooling process after manufacturing can be employed for this method such as compression molding process, injection molding process, resin transfer molding processes and its variants.