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Wedges

Wedges

A wedge is a simple machine that serves various purposes, such as adjusting the elevation of structural or mechanical parts, providing stability for heavy objects, and splitting a body into two parts. This versatile tool can amplify an applied force, making it easier to manipulate large or heavy objects.
Consider using a wedge to lift a heavy slab. Here, the wedge functions by converting the applied force into a much larger force directed almost perpendicular to the initial force. This...

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A Guided Wave Inspection Technique for Wedge Features.

Joseph Corcoran, Eli Leinov, Alejandro Jeketo

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|December 17, 2019

Summary

This study introduces a new method using guided waves in wedge tips for nondestructive evaluation (NDE) of engineering components. The technique successfully detected a small defect in a jet engine seal fin, demonstrating its practical application.

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Area of Science:

Materials Science
Mechanical Engineering
Ultrasonics

Background:

Engineering components with wedge-like structures require robust nondestructive evaluation (NDE) for safety and functionality.
Existing analytical methods for ideal wedges are insufficient for real-world, irregular geometries.
Feature-guided waves, specifically antisymmetric flexural edge modes, are proposed for defect detection at wedge tips.

Purpose of the Study:

To characterize guided wave behavior in nonideal wedge-like features using a semianalytical finite-element (SAFE) methodology.
To assess the suitability of these edge modes for NDE inspection of components like jet engine seal fins.
To develop and present practical methods for exciting and detecting these waves for industrial application.

Main Methods:

Utilized a semianalytical finite-element (SAFE) methodology to model guided waves in irregular wedge cross-sections.
Developed a piezoelectric-based dry-coupled transducer system for pulse-echo operation.
Compared wave behavior in nonideal wedges with edge modes in ideal wedges.

Main Results:

Successfully characterized guided wave propagation in nonideal wedge-like features.
Demonstrated the excitation and detection of flexural edge modes using the developed transducer system.
Achieved a 28 dB signal-to-noise ratio for a 0.75-mm radial tip defect in experimental validation.

Conclusions:

Antisymmetric flexural edge modes are effective for NDE of wedge-like features, even with irregular geometries.
The SAFE methodology and piezoelectric transducer system provide a viable approach for industrial NDE applications.
The study lays the scientific and practical groundwork for exploiting edge wave-based inspection.