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Related Concept Videos

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Plastic Deformations01:14

Plastic Deformations

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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...
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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.
As the bending moment...
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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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Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
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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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A mechanically robust and facile shape morphing using tensile-induced buckling.

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  • 1School of Engineering, Westlake University, Hangzhou, Zhejiang 310030, China.

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This study introduces a novel shape-morphing strategy using tensile-induced buckling for robust, intricate 3D structures. The scalable method simplifies fabrication and enhances applications in soft robotics and biomedical devices.

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Area of Science:

  • Materials Science
  • Robotics
  • Biomedical Engineering

Background:

  • Soft structures inspired by biology offer versatile applications.
  • Existing shape-morphing methods face challenges in fabrication complexity and mechanical fragility.

Purpose of the Study:

  • To develop a robust and facile shape-morphing strategy for creating complex 3D structures.
  • To overcome limitations of current fabrication processes and enhance mechanical resilience.

Main Methods:

  • Utilizing tensile-induced buckling by attaching restraining strips to a stretchable substrate.
  • Employing an inverse design method to guide the formation of diverse 3D configurations.
  • Investigating stiffness mismatch and Poisson's effect for controlled buckling.

Main Results:

  • Successfully demonstrated the transformation of flat structures into intricate 3D shapes.
  • Developed highly universal, efficient, and durable soft grippers through shape morphing.
  • Validated the scalability and material independence of the proposed strategy.

Conclusions:

  • The tensile-induced buckling strategy offers a simplified and robust approach to shape morphing.
  • This method has significant potential for advancing soft robotics, haptics, and biomedical devices.
  • The technique is adaptable and broadly applicable across various material systems.