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Related Concept Videos

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...
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Circular Shafts - Elastoplastic Materials01:24

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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
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Angle of Twist: Problem Solving01:13

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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...
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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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Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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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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Eccentric Axial Loading in a Plane of Symmetry01:16

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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
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Rotational elastic micro joint based on helix-augmented cross-spring design for large angular movement.

Cheol Woo Ha, Dong-Yol Yang

    Optics Express
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    Summary

    A novel 3D micro-joint utilizes a helical structure for enhanced large rotational movement. This design, fabricated using two-photon stereolithography, offers precise and reliable motion for micro-scale applications.

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    Area of Science:

    • Micro-mechanics and robotics
    • Materials science and engineering

    Background:

    • Traditional micro-joints based on cross-spring designs offer precise motion but are limited in their range of rotational angles.
    • Achieving large rotational movement in micro-scale devices is crucial for advanced applications in robotics and manipulation.

    Purpose of the Study:

    • To propose and evaluate a novel 3D micro-joint capable of large rotational movement.
    • To enhance the rotational range of existing micro-joint designs through structural modification.

    Main Methods:

    • Design of a 3D micro-joint incorporating a helical structure to augment a cross-spring base.
    • Fabrication of the micro-joint using the two-photon stereolithography (TPS) process.
    • Manipulation and evaluation of the micro-joint's motion using optical trapping force and RMS error analysis.

    Main Results:

    • The modified micro-joint with a helical structure demonstrated significantly improved large rotational movement compared to a standard cross-spring design.
    • The fabricated micro-joint exhibited precise and reliable motion across a large range of rotational angles.
    • The RMS error analysis confirmed the precision of the micro-joint's movement under optical manipulation.

    Conclusions:

    • The proposed helical micro-joint design effectively overcomes the rotational limitations of traditional cross-spring micro-joints.
    • This novel design enables precise and reliable large rotational movements at the micro-scale, opening possibilities for new micro-robotic systems.
    • Two-photon stereolithography is a viable fabrication method for producing these complex micro-mechanical structures.