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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

674
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
674

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Optical dynamic deformation measurements at translucent materials.

Katrin Philipp, Nektarios Koukourakis, Robert Kuschmierz

    Optics Letters
    |February 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Laser Doppler sensors accurately measure radial expansion in fast-rotating, translucent composite rotors. This non-contact method overcomes limitations of traditional optical techniques for aerospace materials.

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    Area of Science:

    • Materials Science
    • Mechanical Engineering
    • Optical Measurement

    Background:

    • Glass fiber-reinforced polymers offer high stiffness-to-weight ratios, making them ideal for rotor applications, particularly in aerospace.
    • Understanding dynamic material behavior requires non-contact, in-situ measurement techniques.
    • Conventional optical methods struggle with high surface speeds and material translucence.

    Purpose of the Study:

    • To evaluate the efficacy of laser Doppler distance sensors for measuring radial expansion in fast-rotating, translucent composite materials.
    • To address the limitations of existing optical measurement techniques in dynamic deformation analysis of such materials.

    Main Methods:

    • Utilized a laser Doppler distance sensor for non-contact, in-situ dynamic deformation measurements.
    • Tested the sensor on fast-rotating fiber-reinforced polymer composite rotors with surface speeds exceeding 300 m/s.
    • Analyzed signal characteristics, specifically addressing backscattering within the material volume versus surface scattering.

    Main Results:

    • The laser Doppler distance sensor proved to be a powerful and reliable tool for monitoring radial expansion.
    • Backscattering within the material volume did not generate secondary signals, ensuring measurement accuracy.
    • Signal integrity was maintained as long as the sample surface was sufficiently rough, isolating surface information.

    Conclusions:

    • Laser Doppler distance sensing is a viable technique for dynamic deformation measurement of fast-rotating, translucent composite materials.
    • This method overcomes the challenges posed by high speeds and translucence, offering a significant advancement for aerospace material analysis.