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Related Concept Videos

Stress-Strain Diagram01:10

Stress-Strain Diagram

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A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Measurements of Strain01:27

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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Factors Affecting Workability01:24

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The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
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Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

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Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
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Stress Concentrations01:13

Stress Concentrations

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The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
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Risk assessment of cheese processing tasks using the Strain Index and OCRA Checklist.

John Rosecrance1, Robert Paulsen1, Lelia Murgia2

  • 1Colorado State University, Environmental and Radiological Health Sciences Department, 1681 Campus Delivery, Fort Collins, CO 80523, USA.

International Journal of Industrial Ergonomics
|August 4, 2023
PubMed
Summary
This summary is machine-generated.

The Strain Index (SI) and Occupational Repetitive Actions (OCRA) Checklist are effective ergonomic tools for assessing workplace hazards. Both methods provide similar risk ratings for cheese manufacturing tasks, aiding occupational health professionals.

Keywords:
ErgonomicsMethodological reliabilityPhysical exposure assessmentSemi-quantitative methods

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Area of Science:

  • Occupational Health
  • Ergonomics
  • Industrial Hygiene

Background:

  • Ergonomic risk assessment is crucial for preventing upper extremity injuries in the workplace.
  • The Strain Index (SI) and Occupational Repetitive Actions (OCRA) Checklist are widely used methods for evaluating physical exposures.
  • Comparing these methods provides insights into their applicability and effectiveness in diverse industrial settings.

Purpose of the Study:

  • To compare the efficacy of the Strain Index (SI) and the Occupational Repetitive Actions (OCRA) Checklist in assessing ergonomic risks.
  • To evaluate the consistency and differences in risk classifications provided by the SI and OCRA Checklist for specific industrial tasks.

Main Methods:

  • Seven raters assessed 21 cheese-manufacturing tasks using both the SI and OCRA Checklist.
  • Task-level physical exposures to the upper extremity were evaluated.
  • Risk classifications were compared between the two assessment methods.

Main Results:

  • Nearly half (49.1%) of tasks were classified as hazardous by the OCRA Checklist, while 60.2% were classified as hazardous by the SI.
  • Despite differing constructs, both methods often placed job tasks into similar risk categories.
  • Differences in classification were linked to variable definitions and task complexity, with SI focusing on the distal upper extremity and OCRA on the entire upper extremity.

Conclusions:

  • Both the SI and OCRA Checklist are valuable tools for ergonomic risk assessment in occupational health.
  • The choice of assessment method should align with the specific purpose and complexity of the industrial tasks being evaluated.
  • For cheese processing tasks, both the SI and OCRA Checklist yield comparable risk assessment ratings.