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Residual Stresses in Circular Shafts01:10

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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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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...
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Flat belts are crucial in many industrial applications as they help transmit power from one pulley to another. The concept of forces and moments is used to determine the maximum moment on a pulley. For instance, consider a flat belt that wraps around two pulleys, A and B, with radii of 30 cm and 10 cm, respectively. The angle between the belt and the horizontal is 20 degrees at the pulleys. As pulley B rotates clockwise and drives pulley A, tension T2 is caused at one end of the belt, while...
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Author Response: Letter to the Editor of IOVS From Joseph L. Demer and Robert A. Clark Regarding Joel M. Miller, "EOM Pulleys and Sequelae: A Critical Review".

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EOM Pulleys and Sequelae: A Critical Review.

Joel M Miller1

  • 1Eidactics and The Strabismus Research Foundation, San Francisco, California, United States.

Investigative Ophthalmology & Visual Science
|December 5, 2019
PubMed
Summary
This summary is machine-generated.

The Miller-Demer (M-D) pulley concept is well-supported, resolving oculomotor physiology questions. Other hypotheses, like the Active Pulley Hypothesis (APH), lack convincing evidence.

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Area of Science:

  • Oculomotor physiology
  • Ophthalmology
  • Biomechanics

Background:

  • The discovery of extraocular muscle (EOM) pulleys has significantly advanced understanding of eye movement control.
  • This has spurred new theories regarding EOM function and their role in ocular motility.

Purpose of the Study:

  • To describe the Miller-Demer (M-D) pulley concept in detail.
  • To critically evaluate the evidence supporting the M-D Pulleys against alternative hypotheses.
  • To review the methodologies underpinning current theories of EOM function.

Main Methods:

  • Analysis of mechanical independence of individual EOM fibers.
  • Review of nerve tracing studies for functional independence of EOM layers.
  • Assessment of image-based methods for EOM contraction.
  • Examination of data analysis issues in oculomotor research.

Main Results:

  • The M-D Pulleys are robustly supported by multiple lines of evidence from various research groups.
  • The Active Pulley Hypothesis (APH) has been largely disproven due to lack of supporting evidence.
  • The EOM Compartments hypothesis shows potential for oculorotary force gradients but requires more convincing data.

Conclusions:

  • The M-D Pulleys represent a well-established model for EOM function.
  • Current evidence does not support the Active Pulley Hypothesis (APH).
  • Further research is needed to validate the EOM Compartments hypothesis and its implications.