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Related Concept Videos

Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
Applications of Stress01:04

Applications of Stress

Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
Residual Stresses in Bending01:18

Residual Stresses in Bending

In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...

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Related Experiment Video

Updated: Jun 6, 2026

Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis
07:44

Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis

Published on: March 23, 2019

Differences in lumbar spine load due to posture and upper limb external load.

Joanna Kamińska1, Danuta Roman-Liu, Tomasz Zagrajek

  • 1Central Institute for Labour Protection, National Research Institute (CIOP-PIB), Poland. jozab@ciop.pl

International Journal of Occupational Safety and Ergonomics : JOSE
|December 15, 2010
PubMed
Summary

Minimizing spine load is crucial for preventing lumbar musculoskeletal disorders. Maintaining an erect posture and lifting light objects significantly reduces stress and compression forces on intervertebral discs.

Related Experiment Videos

Last Updated: Jun 6, 2026

Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis
07:44

Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis

Published on: March 23, 2019

Area of Science:

  • Biomechanics
  • Spinal Health
  • Musculoskeletal Disorders

Background:

  • The lumbar spine is highly susceptible to musculoskeletal disorders.
  • Accurate modeling is essential for understanding spinal load.
  • Optimizing muscle work is key to reducing spinal strain.

Purpose of the Study:

  • To assess lumbar spine load using an accurate biomechanical model.
  • To investigate the impact of posture and load force on spinal stresses.
  • To identify strategies for minimizing lumbar spine load.

Main Methods:

  • Development of a finite element model of the lumbar spine.
  • Application of the energy criterion for optimizing muscle work.
  • Computer simulations to analyze stresses and compression forces.

Main Results:

  • Spinal stresses and intervertebral disc compression forces increase with greater load.
  • Bent-forward postures result in significantly higher spinal loads compared to erect postures.
  • Lifting light objects and maintaining an erect posture are identified as critical load-minimizing factors.

Conclusions:

  • The study highlights the importance of posture in managing lumbar spine load.
  • Recommendations are provided for reducing the risk of musculoskeletal disorders in the lumbar region.
  • Finite element analysis offers valuable insights into spinal biomechanics and injury prevention.