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Related Concept Videos

Fatigue01:21

Fatigue

777
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...
777
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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Stresses under Combined Loadings01:23

Stresses under Combined Loadings

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When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
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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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Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

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Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
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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...
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Updated: Jan 6, 2026

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Fatigue crack propagation analysis considering the dynamic crack-load coupling effect.

Wennian Yu1,2, Yongbo Yu3,4, Feifan Shi3,4

  • 1State Key Laboratory of Mechanical Transmissions for Advanced Equipment, Chongqing University, Chongqing, 400044, PR China. wennian.yu@cqu.edu.cn.

Scientific Reports
|October 23, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to simulate gear fillet crack propagation by accounting for the dynamic load interaction. This approach offers more reliable fatigue life predictions for cracked gear systems.

Keywords:
Crack propagationCrack-load couplingFinite element simulationGear dynamic model

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Tribology

Background:

  • Gear fillet cracks are a common failure mode in gear systems.
  • Existing models often overlook the crucial crack-load interaction, potentially leading to inaccurate fatigue life predictions.
  • Understanding crack propagation dynamics is vital for enhancing gear durability.

Purpose of the Study:

  • To develop an integrated model simulating gear fillet crack propagation.
  • To incorporate the dynamic "crack-load" interaction for improved accuracy.
  • To provide a more reliable method for fatigue life prediction in cracked gears.

Main Methods:

  • An integrated finite element method-dynamic model of a cracked gear pair was established.
  • The dynamic load was simulated, and the rainflow counting method was used to generate the load spectrum.
  • A cyclic simulation approach was employed to model crack propagation increments and angles.

Main Results:

  • The integrated model successfully simulates gear fillet crack propagation considering the coupling effect.
  • The simulation provides a more accurate representation of the crack path compared to previous methods.
  • The developed method enhances the reliability of fatigue crack propagation simulation.

Conclusions:

  • The proposed modeling method offers a more reliable simulation of gear fillet crack propagation.
  • Accurate simulation of crack propagation is essential for precise fatigue life prediction.
  • This research contributes to improving the design and maintenance of gear transmission systems.