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Fatigue

Fatigue

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...

Fatigue Strength of Concrete

Fatigue Strength of Concrete

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...

Muscle Recovery and Fatigue

Muscle Recovery and Fatigue

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 response...

Design Consideration

Design Consideration

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 aspect...

Survey Safety

Survey Safety

Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...

Insufficient Sleep and Sleep Deprivation

Insufficient Sleep and Sleep Deprivation

Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...

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Related Experiment Video

Updated: Jun 6, 2026

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

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

Published on: August 8, 2019

The link between fatigue and safety.

Ann Williamson¹, David A Lombardi, Simon Folkard

¹Department of Aviation, University of New South Wales, UNSW Sydney, Australia. a.williamson@unsw.edu.au

Accident; Analysis and Prevention

|December 7, 2010

Summary

This summary is machine-generated.

Fatigue from sleep debt and monotonous tasks impairs performance and causes accidents. Circadian rhythms

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

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Area of Science:

Occupational Health
Human Factors
Sleep Science

Background:

Fatigue is a significant concern in safety-critical industries.
Understanding fatigue's causes is crucial for preventing accidents and injuries.

Purpose of the Study:

To review evidence linking fatigue causes to safety outcomes.
To examine effects on accidents, injuries, and performance in transport and occupational settings.

Main Methods:

Systematic literature review.
Analysis of studies on sleep homeostasis, circadian influences, and task effects on safety.

Main Results:

Clear evidence links sleep homeostatic factors to impaired performance and accidents.
Monotony and sustained attention tasks significantly degrade performance.
Evidence for task effects on accidents/injuries is inconclusive due to limited studies.
Direct link between circadian factors and safety outcomes is not supported; effects likely combined with sleep factors.

Conclusions:

Sleep debt and task characteristics are key drivers of fatigue-related safety issues.
Further research is needed to clarify the role of circadian influences on safety.
Addressing sleep and task design is critical for improving safety.