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Related Concept Videos

Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Fatigue Crack Length Sizing Using a Novel Flexible Eddy Current Sensor Array.

Ruifang Xie1, Dixiang Chen2, Mengchun Pan3

  • 1College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China. xieruifang2@163.com.

Sensors (Basel, Switzerland)
|December 26, 2015
PubMed
Summary

A new flexible eddy current sensor array detects and sizes microcracks in airplane parts. This advanced nondestructive testing tool offers high sensitivity and accuracy for condition-based maintenance.

Keywords:
crack sizingflexible eddy current arrayhigh sensitivequantitative nondestructive evaluationspatial resolution

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Aerospace Engineering

Background:

  • Nondestructive testing (NDT) requires sensitive, flexible eddy current probes for inspecting complex geometries.
  • Microcrack detection is crucial for ensuring the structural integrity of critical aircraft components.
  • Condition-based maintenance (CBM) necessitates advanced sensors for real-time monitoring.

Purpose of the Study:

  • To develop a novel flexible planar eddy current sensor array for microcrack inspection in aircraft parts.
  • To achieve high spatial resolution and sensitivity for detecting shallow and fatigue cracks.
  • To enable quantitative assessment and sizing of cracks for improved maintenance strategies.

Main Methods:

  • Fabrication of a 64-element flexible planar eddy current sensor array using polyimide films and printed circuit board techniques.
  • Finite element simulation to analyze working principles and crack responses.
  • Development and experimental verification of a crack length sizing algorithm.

Main Results:

  • The sensor array exhibits high sensitivity to microcracks with a spatial resolution of 0.8 mm.
  • Finite element simulations accurately predicted crack responses.
  • Experimental validation confirmed the sensor's capability for crack length sizing with an accuracy of ±0.2 mm.

Conclusions:

  • The developed flexible eddy current sensor array is effective for microcrack detection and sizing in critical aircraft components.
  • The sensor's design allows conformance to complex structures, suitable for aerospace applications.
  • The proposed crack sizing algorithm enhances the utility of eddy current testing for condition-based maintenance.