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Related Concept Videos

General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

187
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...
187
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

312
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
312
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

199
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.
199
Plastic Deformations01:14

Plastic Deformations

89
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
89
Unsymmetric Bending01:18

Unsymmetric Bending

338
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 those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
338

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Related Experiment Video

Updated: Jul 9, 2025

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
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Complex Neck Loading and Injury Tolerance in Lateral Bending With Head Rotation From Human Cadaver Tests.

Narayan Yoganandan1, Jamie Baisden1, Aditya Vedantam1

  • 1Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, WI 53226.

Journal of Engineering and Science in Medical Diagnostics and Therapy
|December 7, 2023
PubMed
Summary

Automated vehicles may alter occupant posture, impacting head-cervical spine tolerance. This study measured lateral bending forces and moments in cadaver specimens, revealing atlas fractures and ligament injuries.

Keywords:
bending momentcervical spineinjury risk curvemultiplanar loadingupper neck loads

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Area of Science:

  • Biomechanics
  • Orthopedic Surgery
  • Automotive Safety Engineering

Background:

  • Automated vehicle advancements introduce non-standard occupant postures.
  • Altered postures may affect head-cervical spine injury tolerance.
  • Understanding these tolerances is crucial for occupant safety system design.

Purpose of the Study:

  • To determine the lateral bending tolerance of the head-cervical spine in an initial head rotation posture.
  • To characterize injury patterns resulting from these loads.
  • To provide data for improved safety in automated vehicles.

Main Methods:

  • Human cadaver head-cervical spine complexes were used.
  • A custom loading device applied lateral bending loads at 1.5 m/s.
  • Loads and moments were measured at the occipital condyles and lower neck.

Main Results:

  • Peak forces and moments at the occipital condyles and lower neck were quantified.
  • Ipsilateral atlas lateral mass fractures occurred in 80% of specimens.
  • Joint diastasis and capsular ligament injuries were observed.

Conclusions:

  • Initial head rotation alters head-cervical spine tolerance to lateral bending.
  • Atlas fractures are a significant injury pattern under these conditions.
  • Further research is needed to refine tolerance data and injury prediction models.