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Related Concept Videos

Fatigue01:21

Fatigue

885
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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Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Microcracking in Concrete01:20

Microcracking in Concrete

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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...
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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

598
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
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Related Experiment Video

Updated: Feb 23, 2026

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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A Fatigue Crack Size Evaluation Method Based on Lamb Wave Simulation and Limited Experimental Data.

Jingjing He1, Yunmeng Ran2, Bin Liu3

  • 1School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China. hejingjing@buaa.edu.cn.

Sensors (Basel, Switzerland)
|September 14, 2017
PubMed
Summary

This study introduces a novel method for quantifying crack size using Lamb waves and Bayesian updating. The approach accurately estimates crack dimensions by combining finite element simulations with real-world structural data.

Keywords:
Bayesian updatingLamb wave simulationcrack size quantification modeluncertainty

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Non-Destructive Testing

Background:

  • Lamb wave propagation is sensitive to structural damage like cracks.
  • Accurate crack size quantification is crucial for structural integrity assessment.
  • Existing methods often struggle with uncertainties and limited data.

Purpose of the Study:

  • To develop a systematic and general method for Lamb wave-based crack size quantification.
  • To integrate finite element simulations with Bayesian updating for robust damage assessment.
  • To validate the proposed method on various structural components under different conditions.

Main Methods:

  • Construction of a baseline quantification model using finite element simulations.
  • Correlation of damage-sensitive features (normalized amplitude, phase change) with crack length via response surface models.
  • Bayesian updating of the baseline model using limited Lamb wave data from target structures to account for uncertainties.
  • Extraction of damage-sensitive features from the S₀ mode Lamb wave package.

Main Results:

  • The baseline model effectively correlates Lamb wave features with crack length.
  • Bayesian updating successfully accounts for uncertainties between simulation and real structures.
  • The method demonstrated effectiveness and accuracy in crack size quantification.
  • Validation using in-situ fatigue testing on coupon specimens and lap-joint components confirmed the approach.

Conclusions:

  • The proposed Lamb wave-based method provides a reliable approach for crack size quantification.
  • The integration of finite element simulations and Bayesian updating offers a powerful tool for structural health monitoring.
  • The method's accuracy and effectiveness are proven under various loading and damage scenarios.