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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

163
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...
163
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

147
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...
147
Impact Loading01:19

Impact Loading

196
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
196
Plastic Deformations01:19

Plastic Deformations

129
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...
129
Residual Stresses01:26

Residual Stresses

218
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
218
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

263
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.
263

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Related Experiment Video

Updated: Jun 23, 2025

Rod-based Fabrication of Customizable Soft Robotic Pneumatic Gripper Devices for Delicate Tissue Manipulation
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Imprinting reversible deformations on a compressed soft rod network.

Harsh Jain1,2, Shankar Ghosh2

  • 1Simons Centre for the Study of Living Machines, National Center for Biological Sciences, Bengaluru-560065, India. harshjainldh@gmail.com.

Soft Matter
|June 14, 2024
PubMed
Summary
This summary is machine-generated.

Soft cellular materials exhibit reversible deformation storage. Under compression, they enter a pseudo-plastic phase, retaining indentations until external strain is removed, unlike their elastic phase behavior.

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Area of Science:

  • Materials Science
  • Mechanics of Materials
  • Polymer Science

Background:

  • Soft cellular materials, networks of polymeric rods, exhibit complex mechanical responses.
  • Understanding deformation behavior in these materials is crucial for designing advanced applications.

Purpose of the Study:

  • To investigate the emergent behavior of mechanical deformation storage in compressed soft cellular materials.
  • To differentiate between elastic and pseudo-plastic deformation regimes.
  • To model the friction-based mechanism behind reversible deformation storage.

Main Methods:

  • Experimental characterization of soft cellular materials under compressive strain.
  • Analysis of material response in elastic and pseudo-plastic regimes.
  • Development of a friction-based model to explain observed behavior.

Main Results:

  • Soft cellular materials transition from an elastic (relaxing) to a pseudo-plastic (deformation-storing) regime under compression.
  • Indentation is stored indefinitely in the pseudo-plastic phase.
  • Deformation is reversible upon removal of the external strain field.

Conclusions:

  • A novel pseudo-plastic regime enables reversible mechanical deformation storage in soft cellular materials.
  • Friction plays a key role in the observed deformation storage and recovery.
  • This behavior offers potential for developing materials with tunable mechanical memory.