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Related Concept Videos

Normal and Shear Force01:14

Normal and Shear Force

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When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
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Design Example: Resistive Touchscreen01:14

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Shearing Strain01:20

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Principal Stresses01:24

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The graphical depiction of normal and shearing stress equations is represented by a circle, demonstrating the interplay between these stresses under different angular conditions. The center of this circle C, located on the vertical axis, represents the average normal stress, while its radius shows the range of stress variations. At points A and B, where the circle intersects the horizontal axis, the maximum and minimum normal stresses are observed, occurring without shearing stress. These...
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Characteristics of Dry Friction01:21

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Related Experiment Video

Updated: Jan 1, 2026

Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
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Phase Difference Between Normal and Shear Forces During Tactile Exploration Represents Textural Features.

Hikaru Hasegawa, Shogo Okamoto, Yoji Yamada

    IEEE Transactions on Haptics
    |December 17, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Investigating tactile exploration, this study reveals that phase differences between normal and shear forces offer unique insights into material properties, complementing traditional power spectra analysis for better finger-material interaction understanding.

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    Area of Science:

    • Robotics
    • Haptics
    • Tribology
    • Biophysics

    Background:

    • Tactile exploration involves contact forces and skin deformation, analyzed in the frequency domain to understand finger-material interactions.
    • Power spectra of these signals are key features for material surface property assessment.
    • Phase information in tactile signals has been largely unexplored, limiting a full understanding.

    Purpose of the Study:

    • To investigate the understudied phase differences between normal and shear forces during tactile exploration.
    • To determine if phase differences provide distinct information about material properties compared to power spectra.
    • To enhance models of finger-material interaction by incorporating phase information.

    Main Methods:

    • Experimental setup for tactile exploration with sensors to capture normal and shear forces.
    • Signal processing in the frequency domain to analyze both power spectra and phase differences.
    • Comparative analysis of phase differences across various materials.

    Main Results:

    • Phase differences between normal and shear forces were found to vary significantly among different materials.
    • These phase differences exhibited distinct characteristics not present in the power spectra.
    • The findings suggest phase information is a crucial, previously overlooked, aspect of tactile sensing.

    Conclusions:

    • Phase differences between axial forces are a critical, material-dependent feature in tactile exploration.
    • Incorporating phase information alongside power spectra offers a more comprehensive understanding of finger-material interactions.
    • Future research in haptics and robotics should consider phase differences for improved material characterization and tactile feedback.