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Related Concept Videos

Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
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Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
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Design of Transmission Shafts01:16

Design of Transmission Shafts

908
The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Updated: Mar 30, 2026

Application of Design Aspects in Uniaxial Loading Machine Development
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Published on: September 19, 2018

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[Approaches to radial shaft].

J Bartoníček, O Naňka, M Tuček

    Rozhledy V Chirurgii : Mesicnik Ceskoslovenske Chirurgicke Spolecnosti
    |November 12, 2015
    PubMed
    Summary

    The Henry approach offers a safer surgical option for radial shaft fractures, especially in the proximal region, compared to the Thompson approach. Careful dissection during the Henry approach minimizes the risk of radial nerve injury.

    Area of Science:

    • Orthopedic Surgery
    • Anatomy

    Background:

    • Radial shaft fractures can be approached surgically via the posterolateral Thompson or volar Henry methods.
    • Injury to the deep branch of the radial nerve is a significant concern with both approaches.
    • Optimal surgical approach for proximal radial shaft fractures remains debated.

    Purpose of the Study:

    • To compare the safety and efficacy of the Henry and Thompson approaches for radial shaft fracture exposure.
    • To provide anatomical insights for minimizing radial nerve injury during these procedures.

    Main Methods:

    • Anatomical study and clinical experience evaluating the Thompson and Henry approaches.
    • Detailed description of the three-phase Henry approach, emphasizing critical dissection points.
    • Techniques for protecting the deep branch of the radial nerve during proximal radius exposure.

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    Main Results:

    • The Thompson approach is deemed safe for middle and distal radial shaft fractures but risky for proximal fractures.
    • The Henry approach is suitable for all radial shaft fractures, providing safe access to the entire lateral and anterior radius.
    • Specific steps in the Henry approach, including brachioradialis and supinator management, reduce the risk of deep radial nerve injury.

    Conclusions:

    • The Henry approach is recommended for fractures involving the proximal third of the radial shaft due to its superior safety profile.
    • Careful adherence to the described Henry approach phases and anatomical landmarks is crucial for preventing radial nerve damage.
    • The Henry approach facilitates comprehensive exposure of the radius, including potential humeroradial joint revision.