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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 torque...
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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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Highly twisted supercoils for superelastic multi-functional fibres.

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Researchers developed highly stretchable and conductive fibers using a novel supercoil structure. These advanced fibers demonstrate exceptional elasticity and multiple functionalities, paving the way for innovative applications in flexible electronics and wearable devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Textile Engineering

Background:

  • Developing highly deformable and electrically conductive fibers is crucial for advanced applications.
  • Existing materials often lack the required combination of elasticity, conductivity, and multifunctionality.

Purpose of the Study:

  • To fabricate highly deformable and electrically conductive fibers with multiple functionalities.
  • To investigate the properties and potential applications of a novel supercoil fiber structure.

Main Methods:

  • Fabrication of supercoil fibers by twisting spandex-core fibers wrapped in a carbon nanotube sheath.
  • Characterization of the supercoiled fibers' structural, mechanical, and electrical properties.
  • Integration of pseudocapacitive-active materials to create supercapacitors and evaluation of electrothermal muscle functionality.

Main Results:

  • The supercoiled fibers exhibit a highly ordered, compact structure capable of sustaining up to 1,500% elastic deformation.
  • A 4.2% resistance increase was observed for 1,000% stretching in passivated supercoiled fibers.
  • Superelastic supercapacitors demonstrated high linear (21.7 mF cm⁻¹) and areal (92.1 mF cm⁻²) capacitance, maintaining performance during 1,000% stretching.
  • The fibers functioned as electrothermal artificial muscles, contracting by 4.2% upon application of 0.45 V mm⁻¹.

Conclusions:

  • The novel supercoil fiber structure offers a promising platform for creating highly stretchable, conductive, and multifunctional materials.
  • These fibers show potential for applications in wearable electronics, energy storage, and artificial muscles.
  • The demonstrated superelasticity and multifunctionality open new avenues for advanced material design.