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Related Concept Videos

Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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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.
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Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

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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...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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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.
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Stress on an Oblique Plane01:16

Stress on an Oblique Plane

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Understanding stress on an oblique plane under axial loading is pivotal in material mechanics. This analysis offers insight into a material's durability and strength, which is crucial for civil engineering and structural design. Axial loading refers to force application along the material's central axis, causing compression or elongation and leading to normal stress. Normal stress occurs when a force acts perpendicularly to the material's area, resulting in compressive or tensile...
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Muscles of the Pelvic Floor and Perineum01:26

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The muscles of the pelvic floor and perineum are crucial for supporting the pelvic organs, controlling continence, and aiding in sexual function, childbirth, and core stability. They are typically divided into the superficial perineal layer and the deep pelvic floor layer.
Perineal Layer
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Related Experiment Video

Updated: Jul 9, 2025

Biaxial Basal Tone and Passive Testing of the Murine Reproductive System Using a Pressure Myograph
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Penetrative anal intercourse may require high axial loading forces.

Jake A Miller1, Charles A Loeb1, Justin La2

  • 1Department of Urology, University of California, Los Angeles, Los Angeles, CA, United States.

The Journal of Sexual Medicine
|November 28, 2023
PubMed
Summary
This summary is machine-generated.

The force needed for anal penetration is higher than for vaginal penetration, potentially increasing mechanical stress on penile implants. Clinicians should counsel patients on safe use during intercourse.

Keywords:
anal canalerectile dysfunctionpenile prosthesissexual behavior

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Area of Science:

  • Urology
  • Sexual Health
  • Biomechanical Engineering

Background:

  • Lifetime prevalence of anal intercourse is increasing.
  • Safety of inflatable penile prosthesis (IPP) use during anal intercourse is largely unknown.
  • Forces required for anal penetration are not well-documented.

Purpose of the Study:

  • To quantify the force required for anal penetration.
  • To provide data for counseling on IPP safety during anal intercourse.

Main Methods:

  • A silicone phallus with a force gauge was inserted into the anal canals of 6 male participants.
  • Maximum axial forces during insertion were recorded.
  • Participants completed surveys on sexual history.

Main Results:

  • Median maximal force for anal penetration was 26.5 N (range: 16.1-51.7 N).
  • Frequent participants (>$>$1/month) used less force (median 25.7 N) than infrequent participants (median 41.6 N).
  • Forces required for anal penetration exceeded those for vaginal penetration.

Conclusions:

  • Anal penetration forces may impose greater mechanical stress on the phallus compared to vaginal penetration.
  • Clinicians should advise patients about the potential risks and safe usage of IPPs during anal intercourse.
  • This study provides novel data on anal penetration forces, despite limitations such as small sample size.