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Strain and Elastic Modulus

Strain and Elastic Modulus

The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...

Elastic Strain Energy for Shearing Stresses

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...

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Updated: Oct 11, 2025

Mechano-Node-Pore Sensing: A Rapid, Label-Free Platform for Multi-Parameter Single-Cell Viscoelastic Measurements

Mechano-Node-Pore Sensing: A Rapid, Label-Free Platform for Multi-Parameter Single-Cell Viscoelastic Measurements

Published on: December 2, 2022

A Selective-Response Bioinspired Strain Sensor Using Viscoelastic Material as Middle Layer.

Dakai Wang¹, Junqiu Zhang¹, Guoliang Ma¹

¹Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China.

|December 2, 2021

Summary

This summary is machine-generated.

Scorpions inspired a new flexible strain sensor that effectively filters out low-frequency noise. This bioinspired sensor achieves high sensitivity and a superior signal-to-noise ratio (SNR) for precise measurements.

Keywords:

anti-interference preprocessing scorpion selective-response strain sensors viscoelastic material

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Published on: January 30, 2020

Area of Science:

Materials Science
Bio-inspired Engineering
Sensor Technology

Background:

Flexible strain sensors are crucial for electronic skins, robotics, and prosthetics.
Improving sensor sensitivity while maintaining a high signal-to-noise ratio (SNR) is a significant challenge.
Scorpions utilize viscoelastic materials in their sensilla to process vibration signals, offering a biological model for sensor design.

Purpose of the Study:

To design a bioinspired strain sensor that mimics the scorpion's strategy for signal preprocessing.
To develop a strain sensor with enhanced performance, particularly insensitivity to low strain rates and high SNR.
To explore the sensor's capabilities in both strain sensing and vibration detection.

Main Methods:

A two-step template transfer method was employed to fabricate the bioinspired strain sensor.
The sensor's response to varying strain rates was evaluated by measuring resistance changes.
Noncontact vibration experiments were conducted to assess responses to different frequencies and impacts.

Main Results:

The bioinspired sensor exhibited a relative resistance change of 110% under identical strain but different strain rates (0.1 Hz vs. ~20 Hz).
Distinct responses were observed for low-frequency vibrations and high-frequency impacts in noncontact experiments.
As a flexible strain sensor, it achieved a high gauge factor (GF) of 4596 at 0.6% strain with a 140 ms response time.

Conclusions:

The developed bioinspired strain sensor effectively preprocesses signals, inspired by scorpion sensilla, leading to improved SNR.
The sensor demonstrates dual functionality, performing reliably as a strain sensor and differentiating vibration types.
This technology holds promise for ultraprecision measurement applications, especially for detecting small signals in challenging environments.