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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

194
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
194

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Microcrack localization based on static component induced by a primary A0 Lamb wave in a thin plate.

Jishuo Wang1, Caibin Xu1, Ning Hu2

  • 1College of Aerospace Engineering, Chongqing University, Chongqing, China.

JASA Express Letters
|September 26, 2022
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Summary

This study introduces a novel method for pinpointing microcracks using a static component (SC) generated by an A0 Lamb wave. The technique effectively locates single or multiple microcracks by analyzing the time of flight of the SC pulse.

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Area of Science:

  • Solid Mechanics
  • Non-Destructive Testing
  • Wave Propagation

Background:

  • Microcracks pose significant risks in structural integrity.
  • Accurate microcrack localization is crucial for safety and maintenance.
  • Lamb wave-based methods offer potential for damage detection.

Purpose of the Study:

  • To propose a new method for microcrack localization.
  • To investigate the interaction between microcracks and Lamb waves.
  • To develop an indicator for identifying microcrack location and quantity.

Main Methods:

  • A static component (SC) induced by an A0 Lamb wave is utilized.
  • A 2D finite element model based on a bilinear stress-strain constitutive model is employed.
  • Low-frequency A0 Lamb waves are selected for enhanced localization.
  • A normalized amplitude index is defined using the time of flight of the SC pulse.

Main Results:

  • The proposed method effectively generates a static component (SC) from the primary A0 Lamb wave.
  • The finite element model accurately simulates the interaction between microcracks and Lamb waves.
  • The normalized amplitude index successfully identifies the location and number of microcracks.
  • Simulation results demonstrate the efficacy of the method for single and multiple microcrack detection.

Conclusions:

  • The static component (SC) induced by the A0 Lamb wave is a viable indicator for microcrack localization.
  • The normalized amplitude index provides a reliable measure for damage assessment.
  • This method offers a promising approach for non-destructive evaluation and structural health monitoring.