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Related Concept Videos

Bending and Torsional Moments01:20

Bending and Torsional Moments

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Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
The reaction developed in a structural element when subjected to an external force causes the element to bend. When a structural element bends upwards, it creates compressive normal forces on the top and tensile normal forces on the bottom, resulting in a couple that determines the bending...
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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...
883
Torsion of Noncircular Members01:16

Torsion of Noncircular Members

720
Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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Torsional Pendulum01:09

Torsional Pendulum

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A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played...
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
845
Pneumothorax-I01:26

Pneumothorax-I

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A pneumothorax is a condition where air builds up in the space between the lung and the chest wall, causing the lung to collapse. This condition arises when air enters the space between the parietal and visceral pleura, disrupting the negative pressure essential for lung inflation. This can lead to a partial or complete collapse of the lung.
Pneumothorax can be even further classified as spontaneous, traumatic, and tension pneumothorax.
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Thoracoscopic Extended Right Middle Plus Lower Sleeve Lobectomy for Non-Small-Cell Lung Cancer
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Spontaneous middle-lobe torsion.

Tyler Ternes, Matthew Trump, Melissa Rosado de Christenson

    Radiology Case Reports
    |June 23, 2016
    PubMed
    Summary

    Spontaneous middle-lobe torsion is a rare condition. This case highlights unique radiographic and CT findings in the absence of typical risk factors like surgery or trauma.

    Area of Science:

    • Pulmonology
    • Thoracic Surgery
    • Radiology

    Background:

    • Middle-lobe torsion is a rare pulmonary complication.
    • It is typically associated with post-surgical states, pleural effusion, trauma, or neoplasms.

    Observation:

    • This report details a unique case of spontaneous middle-lobe torsion.
    • The patient presented without any of the commonly recognized risk factors.

    Findings:

    • Radiographic and computed tomography (CT) findings were emphasized.
    • Specific imaging characteristics of spontaneous middle-lobe torsion were identified.

    Implications:

    • This case expands the understanding of middle-lobe torsion etiology.
    • Recognizing these specific imaging findings is crucial for diagnosis.

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