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Related Concept Videos

Fatigue01:21

Fatigue

877
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...
877
Design Consideration01:22

Design Consideration

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
590
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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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...
584
Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

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A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by creating...
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Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

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When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
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Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

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Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
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Related Experiment Video

Updated: Feb 17, 2026

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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A model assessment method for predicting structural fatigue life using Lamb waves.

Dengjiang Wang1, Jingjing He1, Xuefei Guan2

  • 1School of Reliability and Systems Engineering, Beihang University, 37 Xueyuan Rd., Haidian Dist., Beijing 100191, China.

Ultrasonics
|December 6, 2017
PubMed
Summary
This summary is machine-generated.

This study assesses models for predicting structural fatigue life using Lamb waves. It quantifies crack size from Lamb wave data to improve fatigue life predictions, validated with artificial and natural cracks.

Keywords:
Crack size quantificationLamb wavePOD model assessmentProbabilistic fatigue life predictionProbability of detection

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Area of Science:

  • Materials Science
  • Structural Health Monitoring
  • Non-Destructive Testing

Background:

  • Predicting structural fatigue life is crucial for safety and maintenance.
  • Lamb wave testing offers a non-destructive method for damage assessment.
  • Data-driven models are increasingly used for complex material behavior prediction.

Purpose of the Study:

  • To develop and assess data-driven models for predicting structural fatigue life using Lamb wave data.
  • To quantify crack size using damage-sensitive features extracted from Lamb waves.
  • To evaluate the impact of model choice on probabilistic fatigue life predictions.

Main Methods:

  • Lamb wave coupon testing for model development.
  • Extraction of normalized energy, phase change, and correlation coefficient as damage-sensitive features.
  • Proposal and evaluation of four data-driven models using average relative error and probability of detection (POD).
  • Bayesian parameter estimation with Markov chain Monte Carlo simulations for crack growth model calibration.

Main Results:

  • Four data-driven models were proposed and evaluated for crack size quantification.
  • Probability density functions of crack size were derived from POD models.
  • Crack growth model parameters were statistically identified.
  • Model assessment was performed using both artificial and natural crack data.

Conclusions:

  • The study provides a framework for model assessment in fatigue life prediction using Lamb waves.
  • The choice of model significantly influences probabilistic fatigue life predictions.
  • The methodology is validated on both controlled and realistic structural components.