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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
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Mechanical Janus Structures by Soft-Hard Material Integration.

Haozhe Zhang1, Weizhu Yang2, Qingchang Liu1

  • 1Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904, USA.

Advanced Materials (Deerfield Beach, Fla.)
|November 17, 2022
PubMed
Summary
This summary is machine-generated.

Researchers engineered macroscale mechanical Janus structures using soft and hard materials. These structures exhibit unique rotation mechanisms and can be assembled into superstructures for applications like acoustic wave filtering.

Keywords:
mechanical Janus structurereorganizationrotationsoft-hard material integration

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Janus structures, with distinct functionalities on opposite sides, are typically nanoscale and used in sensors, catalysis, and biomedicine.
  • Existing Janus structures often lack integration of materials with significantly different mechanical properties at the macroscale.

Purpose of the Study:

  • To present a novel macroscale mechanical Janus structure integrating soft and hard materials with distinct mechanical properties.
  • To establish a design principle for soft-hard integrated mechanical Janus structures and elucidate their rotation mechanism.
  • To demonstrate the assembly of these Janus structures into superstructures for advanced applications.

Main Methods:

  • Additive manufacturing to create macroscale Janus structures.
  • Extensive experimental, theoretical, and computational studies to understand design principles and rotation mechanisms.
  • Systematic assembly of Janus structure units into ordered superstructures by programming local rotations.

Main Results:

  • Successful engineering of macroscale mechanical Janus structures with a significant contrast in mechanical properties between soft and hard components.
  • Establishment of a design principle and understanding of the unique rotation mechanism governing these soft-hard integrated structures.
  • Demonstration of assembling Janus structures into well-ordered superstructures capable of regulating and filtering acoustic wave propagations.

Conclusions:

  • The developed mechanical Janus structures offer a new paradigm for designing functional materials by integrating disparate mechanical properties at the macroscale.
  • The ability to program local rotations enables the creation of ordered superstructures with tailored functionalities.
  • These soft-hard integrated mechanical Janus structures show promise for applications in acoustic wave manipulation and beyond.