Calibration Block With Embedded Crack for Precise NDE Calibration
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Solution Overview
Problem
Traditional calibration blocks for non-destructive evaluation (NDE) methods do not accurately approximate real-world defects such as cracks, leading to incorrect defect size and shape estimates, particularly in hard-to-crack materials used in engines.
Innovation Solution
A calibration block is manufactured with a controlled crack embedded within a hard-to-crack material, using a less ductile second material with similar acoustic impedance to minimize signal interference from the interface, allowing for precise crack detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional calibration blocks are used with simple geometric features, then manufacturing is easier, but measurement precision for crack detection deteriorates
Solution Approach 1:
The patent changes the geometric parameters of calibration features from simple shapes (holes, notches) to complex crack-like features with specific dimensions, orientations, and depths that mimic real defects. This allows the calibration block to provide more accurate measurement precision for NDE equipment while maintaining manufacturability through controlled fabrication processes.
Solution Approach 2:
The calibration block uses composite construction with a base material matching the inspected component and embedded crack features made from different materials. This composite approach enables precise control over crack geometry and acoustic properties, improving measurement precision while allowing separate optimization of each component for manufacturing.
2Measurement precision
If calibration blocks use features that closely approximate real cracks, then measurement precision improves, but device complexity increases
Solution Approach 1:
The calibration block is segmented into distinct components: base material, embedded crack features, and reference markers. Each segment serves a specific function and can be manufactured separately using optimized processes, then assembled. This reduces overall device complexity while maintaining high measurement precision through controlled feature geometry.
Solution Approach 2:
Different regions of the calibration block have locally optimized properties: the base material matches the inspected component for acoustic similarity, embedded cracks have precise geometries for accurate defect characterization, and reference markers provide calibration benchmarks. This local quality approach improves measurement precision without requiring the entire block to be overly complex.
3Measurement precision
If the second material has different acoustic impedance from the first material, then crack detection signal strength improves, but signal interference from the interface increases
Solution Approach 1:
The patent carefully selects and controls the acoustic impedance parameters of both the base material and embedded crack material. By optimizing this physical parameter, the interface between materials produces minimal acoustic interference while the crack features generate sufficient signal amplitude for precise detection, resolving the contradiction between signal strength and interference.
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 calibration block provides accurate calibration by ensuring the crack signal dominates over interface signals, maintaining the material's microstructure and enabling precise defect estimation in NDE inspections.
Implementation Method 1
a less ductile second material with similar acoustic impedance to minimize signal interference from the interface
Implementation Method 2
subjecting the first material and second material to heat and pressure sufficient to cause diffusion between the first material and the second material creating a metallurgical bond
Data Source
AI summary
Provided herein is a calibration block comprising a controlled crack disposed within the volume of a hard to crack material, where the controlled crack has a predetermined location and a predetermined maximum length. Also provided are methods of making a calibration block having a controlled crack. In some aspects, the calibration block comprises a first material and a second material positioned in a volume of the first material. An interface of the first material and the second material has a signal amplitude that is less than about 50% a signal amplitude produced by the controlled crack as detected by an inspection device. The second material includes at least one crack having a predetermined location defined by the position of the second material within the block and predetermined length defined by a size of the second material.