Tension Load Fixture for 3D Imaging of Composite Fracture Cracks
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Solution Overview
Problem
Conventional test equipment is unable to effectively image microcracks and macrocracks within internal layers of composite materials, limiting the evaluation of fracture behavior and crack measurement accuracy.
Innovation Solution
A tension load fixture with a pair of tension arms and an imaging device that applies tension forces to a specimen, allowing for in-situ computed tomography and three-dimensional imaging of crack development within composite materials, capturing damage modes on a layer-by-layer basis and measuring crack lengths digitally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional test equipment is used to apply tension forces to composite material specimens, then the testing process is simple, but the equipment cannot effectively image microcracks and macrocracks within internal layers, limiting fracture behavior evaluation
Solution Approach 1:
The patent combines the tension loading system with the computed tomography imaging system into an integrated test fixture. The specimen is positioned within the CT scanner's field of view while being subjected to tensile loads, allowing simultaneous mechanical testing and internal crack imaging without requiring separate equipment setups.
Solution Approach 2:
The patent introduces a transparent or radiolucent loading fixture as an intermediary component that allows X-rays to pass through while still applying tension forces to the specimen. This mediator enables the CT scanner to image internal cracks during loading without the metal components of conventional fixtures blocking the X-ray path.
2Measurement precision
If a specimen is secured firmly in conventional test equipment, then the specimen is stable, but compression failure may occur and crack measurement accuracy is limited
Solution Approach 1:
The patent transitions from two-dimensional surface crack measurement to three-dimensional internal crack visualization by rotating the specimen within the CT scanner during loading. This allows measurement of crack length, depth, and propagation direction in three dimensions, providing accurate characterization of fracture behavior without compression failure.
3Ease of operation
If the imaging device is stationary relative to the specimen, then the setup is simple, but three-dimensional imaging of crack growth cannot be achieved
Solution Approach 1:
The patent makes the imaging system dynamic by enabling rotation of the specimen or imaging device during the testing process. The CT scanner acquires images at multiple rotation angles, and these images are reconstructed into three-dimensional representations of crack growth, allowing real-time monitoring of fracture behavior in 3D space.
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
Enhances crack length measurement accuracy, facilitates three-dimensional imaging of crack growth, and provides improved data for sample population statistics by securing the specimen and preventing compression failure, thereby improving the evaluation of fracture behavior.
Implementation Method 1
The imaging device is configured to rotate about a central axis of the tension load fixture that is proximate to the middle region of the specimen to facilitate the generation of a three-dimensional image of the middle region of the specimen
Data Source
AI summary
A tension load fixture for applying tension or loading forces to a specimen comprises a pair of tension arms and an imaging device. The pair of tension arms are configured to releasably couple to opposite end regions of a specimen and to apply tension or loading forces to the specimen. The specimen is configured to be positioned between the pair of tension arms and defines a notch between the opposite end regions of the specimen. The notch extends from a side of the specimen to a middle region of the specimen. The imaging device is configured to capture one or more images of the middle region of the specimen and is configured to rotate about a central axis of the tension load fixture that is proximate to the middle region of the specimen to facilitate generation of a three-dimensional image of the middle region of the specimen as the specimen is subjected to tension or loading forces.