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Related Concept Videos

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

524
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...
524
Plastic Deformations01:19

Plastic Deformations

567
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
567
Plastic Deformations01:14

Plastic Deformations

596
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
596
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

1.0K
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...
1.0K
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

554
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
554
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

517
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...
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Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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Inflated Soft Actuators with Reversible Stable Deformations.

Lindsey Hines1, Kirstin Petersen1,2, Metin Sitti1,2

  • 1Physical Intelligence Department, Max Planck Institute for Intelligent Systems, Heisenbergstraße 3, 70569, Stuttgart, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|March 24, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel soft actuation method using hyperelastic membranes and dielectric elastomer actuators. This approach enables large, repeatable deformations in soft robotic systems without bulky external equipment.

Keywords:
actuatorsdielectric elastomershyperelasticrobotssoft

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Area of Science:

  • Robotics
  • Materials Science
  • Actuation Systems

Background:

  • Current soft robotic systems often rely on cumbersome compressors and pumps for actuation.
  • There is a need for compact and efficient actuation methods in soft robotics.

Purpose of the Study:

  • To present a new soft actuation method for soft robotic systems.
  • To demonstrate an alternative to traditional bulky actuation components.

Main Methods:

  • The method combines hyperelastic membranes with dielectric elastomer actuators.
  • These components are used to control the deformation of sealed chambers.
  • The system switches between stable deformation states.

Main Results:

  • The proposed soft actuation method achieves large and repeatable deformations.
  • The number of stable states is directly proportional to the number of actuatable membranes.
  • The system operates without external compressors or pumps.

Conclusions:

  • This novel actuation method offers a promising alternative for soft robotic systems.
  • The technique allows for multi-state control through a scalable membrane design.
  • It addresses the limitations of current bulky actuation systems in soft robotics.