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Deformation in a Circular Shaft01:10

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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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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Mounting with compliant cylinders for deformable mirrors.

Claudia Reinlein, Matthias Goy, Nicolas Lange

    Optics Letters
    |April 2, 2015
    PubMed
    Summary

    This study introduces compliant cylinders (CCs) for mounting large deformable mirrors. The novel mounting method preserves piezoelectric stroke and ensures negligible changes in surface fidelity for precise optical applications.

    Area of Science:

    • Optics and Optical Engineering
    • Materials Science

    Background:

    • Large aperture deformable mirrors are crucial for adaptive optics.
    • Traditional mounting methods can induce stress, affecting mirror performance.

    Purpose of the Study:

    • To present a new mounting method for large aperture unimorph deformable mirrors using compliant cylinders (CCs).
    • To evaluate the mechanical properties of CCs and their impact on mirror performance.

    Main Methods:

    • Manufacturing compliant cylinders (CCs) from soft silicone.
    • Performing shear testing to determine the Young's modulus of the CC material.
    • Assembling a scale mirror model to assess mount-induced changes in piezoelectric deformation.

    Main Results:

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  • Shear testing provided essential material properties (Young's modulus) for CCs.
  • Experiments demonstrated no decrease in the piezoelectric stroke of the deformable mirror.
  • Changes in surface fidelity due to the mounting method were found to be negligible.

    • Conclusions:

    • Compliant cylinders offer a viable and effective method for mounting large aperture deformable mirrors.
    • This mounting technique preserves the optical performance of deformable mirrors, making them suitable for demanding applications like tight focusing.