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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

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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...
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Plasticity00:58

Plasticity

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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

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When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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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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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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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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Shape morphing mechanical metamaterials through reversible plasticity.

Dohgyu Hwang1,2, Edward J Barron1,2, A B M Tahidul Haque2

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This study introduces a novel shape-morphing material that rapidly reconfigures from flat sheets into complex, load-bearing structures. This breakthrough enables soft machines to achieve reversible shape changes and self-healing capabilities without continuous power.

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Area of Science:

  • Materials Science
  • Robotics
  • Soft Matter Physics

Background:

  • Biological organisms exhibit remarkable shape-morphing abilities, a feat challenging for current soft machines.
  • Soft robots often face limitations in achieving complex configurations, load-bearing capacity, and reversible state transitions.

Purpose of the Study:

  • To develop a multifunctional material with rapid and reversible polymorphic reconfigurability for soft machines.
  • To overcome the inherent trade-offs between deformability and load-bearing capacity in existing soft materials.

Main Methods:

  • Coupling elastomeric kirigami with a reversible plasticity mechanism in metal alloys.
  • Utilizing a phase change mechanism for reversibility and self-healing properties.

Main Results:

  • Achieved rapid morphing (<0.1 seconds) of flat sheets into complex, load-bearing shapes.
  • Demonstrated reversible shape changes and self-healing capabilities without sustained power requirements.
  • Successfully integrated the material into a morphing drone and an underwater morphing machine.

Conclusions:

  • The developed kirigami composite material offers unprecedented shape-morphing capabilities for soft machines.
  • This innovation enables autonomous transformation and deployment for diverse robotic applications, including aerial and underwater tasks.
  • The material eliminates power needs for maintaining reconfigured shapes, enhancing efficiency and functionality.