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Related Concept Videos

Poisson's Ratio01:23

Poisson's Ratio

379
Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
379
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

351
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
351
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

249
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.
249
Measurements of Strain01:27

Measurements of Strain

401
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
401
Switching of BJT01:22

Switching of BJT

364
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
364

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Updated: Jun 5, 2025

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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Sign-Switchable Poisson's Ratio Design for Bimodal Strain-to-Electrical Signal Transducing Device.

Houchao Jing1, Junyan Dan2, Hua Wei1

  • 1Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 6, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel hybrid material enabling stretchable electronics to switch between strain-dependent and strain-insensitive behaviors. This innovation allows for adaptable mechanical sensors and grasping systems for diverse applications.

Keywords:
Young's modulus‐tunable materialbimodal transducing deviceflexible electronicsphase‐change gelsign‐switchable Poisson's ratio

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Electronics

Background:

  • Stretchable electronic devices are crucial for applications like mechanical sensors and actuators.
  • Achieving both strain-insensitivity and strain-responsiveness in a single device remains a significant challenge.
  • Versatile adaptability in various working situations requires devices that can switch between these electronic characteristics.

Purpose of the Study:

  • To develop a hybrid material capable of sign-switchable Poisson's ratio (SSPR).
  • To create a stretchable device with bimodal strain-to-electrical signal transducing (Bi-SET) functions.
  • To demonstrate the device's utility in a mode-switchable grasping system.

Main Methods:

  • A hybrid material was engineered by combining a phase-change gel-based reentrant honeycomb pattern with a polydimethylsiloxane film.
  • The phase-change gel's thermally-regulated Young's modulus was utilized to switch the material's Poisson's ratio between negative and positive values.
  • A pre-stretched silver nanowires film was integrated to achieve bimodal strain-to-electrical signal transducing.

Main Results:

  • The developed hybrid material exhibits a sign-switchable Poisson's ratio (SSPR).
  • The integrated stretchable device demonstrates bimodal strain-to-electrical signal transducing (Bi-SET) functions.
  • The device's strain-resistance response switches between strain-dependent and strain-insensitive behaviors, governed by the SSPR.

Conclusions:

  • A novel hybrid material with SSPR enables stretchable devices to exhibit switchable electronic behaviors.
  • The Bi-SET function allows for versatile adaptability in mechanical sensing and actuation.
  • A proof-of-concept mode-switchable grasping system highlights the practical potential of this technology.