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Related Concept Videos

Fatigue01:21

Fatigue

782
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...
782
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

515
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...
515
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...
515
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

423
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...
423
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

3.9K
Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

453
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: Jan 9, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

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Compound Fatigue Risk in Medium-Haul Pilots.

Jaime K Devine, Steven R Hursh, Julia Behrend

    Aerospace Medicine and Human Performance
    |December 8, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Compound fatigue poses a safety risk for medium-haul pilots. Circadian and psychosocial factors were rated as most fatiguing, even with adequate sleep duration, highlighting the need for schedule optimization.

    Keywords:
    commercial aviationfatiguehuman factorsmedium-haulsafety riskworkload

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    Area of Science:

    • Aviation Safety
    • Human Factors in Aviation
    • Occupational Health

    Background:

    • Compound fatigue, arising from multiple sources like circadian rhythms, workload, and stress, presents a significant safety risk.
    • Medium-haul (M-H) pilots may be particularly susceptible to compound fatigue, yet the specific contributing factors in M-H operations remain under-quantified.

    Purpose of the Study:

    • To quantify the sources of fatigue experienced by airline pilots operating medium-haul routes.
    • To investigate the relationship between different fatigue domains (circadian, environmental, operational, psychosocial) and pilot-reported fatigue levels.

    Main Methods:

    • An anonymous survey was administered to airline pilots working M-H rosters.
    • Pilots ranked fatigue from 40 factors across four domains (circadian, environmental, operational, psychosocial) on a 0-10 scale.
    • Pilots also reported habitual sleep duration.

    Main Results:

    • A total of 223 pilots completed the survey.
    • Circadian factors were rated as most fatiguing (mean 6/10), followed by psychosocial and environmental factors (both 5/10), and operational factors (4/10).
    • Average sleep duration was 7 hours, with no significant correlation found between sleep duration and reported fatigue levels.

    Conclusions:

    • Operational fatigue factors, such as longer work hours and shorter breaks, were perceived as more fatiguing.
    • Schedule features disrupting the circadian low, like early starts or late finishes, contributed to fatigue even when sleep duration was adequate.