Composite Component NDT Using Acoustic Emission for Material Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-destructive testing (NDT) methods for composite materials are inadequate in determining material properties, especially for complex composite structures, leading to challenges in assessing structural integrity and repair certification, which often requires expensive ultimate load testing.
Innovation Solution
A method involving an apparatus with a sensor and signal generator to induce acoustic emission events, analyze peak fundamental antisymmetric and symmetric frequency components, and determine laminate parameters such as fiber type and resin type, using techniques like Hsu-Nielsen Pencil Lead Break events and guided waves to non-destructively assess composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultimate load testing is performed to certify composite parts and repairs, then structural integrity can be verified, but facility requirements and costs increase significantly
Solution Approach 1:
The patent replaces mechanical load testing with acoustic wave-based detection. Acoustic emission sensors detect stress waves generated by material defects, substituting the need for physical destructive testing while maintaining reliability in detecting structural integrity issues.
Solution Approach 2:
The patent introduces acoustic waves as an intermediary to detect structural defects. Instead of directly applying mechanical loads, acoustic waves serve as a mediator to probe the composite material and reveal internal defects through detected stress emissions.
2Difficulty of detecting and measuring
If traditional NDT methods are used to inspect composite materials, then some defects can be detected, but material properties such as fiber type and resin type cannot be determined
Solution Approach 1:
The patent changes the parameters of acoustic wave detection by analyzing multiple frequency components (fundamental and higher harmonics) and their attenuation characteristics. This multi-parameter analysis enables differentiation of material properties including fiber type, resin type, and defect characteristics that traditional single-parameter methods cannot distinguish.
Solution Approach 2:
The patent utilizes mechanical vibration through acoustic wave propagation and analysis of vibrational characteristics. By examining frequency spectra and attenuation of acoustic vibrations, the system extracts material property information while detecting defects, overcoming the limitations of traditional NDT methods.
3Measurement precision
If acoustic emission testing is performed at multiple locations, then comprehensive material assessment is achieved, but testing time and complexity increase
Solution Approach 1:
The patent applies partial action by focusing acoustic emission testing on critical areas or representative locations rather than exhaustive full-coverage scanning. The method achieves sufficient measurement precision for material property identification by testing at strategically selected locations, reducing overall testing time while maintaining accuracy.
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 reduced facility and maintenance requirements for verifying structural integrity, allows detection of flaws and internal damage, and supports efficient inspection of composite alterations and repairs, reducing the need for costly load testing.
Implementation Method 1
inducing a plurality of acoustic emission events on the composite material at a plurality of predetermined locations relative to a sensor
Data Source
AI summary
This disclosure describes systems, methods, and an apparatus for non-destructively assessing composites. The behavior of propagating elastic waves through a structure can provide significant information on the structure and has thus been studied extensively for development of structural monitoring techniques. In thin plates guided waves can develop, which are inherently dispersive, with highly material dependent dispersion characteristics. The identification of the different parameters within a laminate that may affect their mechanical properties is an important step in the assessment of laminate structures.