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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

114
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...
114
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

367
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
367

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An accessible instrument for measuring soft material mechanical properties.

B M Unikewicz1, A M Pincot1, T Cohen1,2

  • 1Massachusetts Institute of Technology, Department of Mechanical Engineering, Cambridge, Massachusetts 02139, USA.

The Review of Scientific Instruments
|April 22, 2025
PubMed
Summary

A new portable instrument makes soft material testing easier and more accessible using the Volume Controlled Cavity Expansion (VCCE) method. This device lowers costs and complexity, enabling wider use in research and industry.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Biomedical Engineering

Background:

  • Soft materials are crucial in robotics, electronics, and healthcare.
  • Traditional testing methods compromise accuracy due to sample extraction.
  • Nonlinear mechanical properties are vital for soft material design.

Purpose of the Study:

  • To develop a portable, benchtop instrument for soft material mechanical testing.
  • To make the Volume Controlled Cavity Expansion (VCCE) method more accessible.
  • To overcome limitations of cost, size, and expertise in VCCE experimentation.

Main Methods:

  • Development of a portable, benchtop instrument using affordable components and open-source software.
  • Utilizing the Volume Controlled Cavity Expansion (VCCE) technique to measure material response.
  • Controlling liquid cavity formation rate and measuring resisting pressure within soft materials.

Main Results:

  • The new instrument successfully tested polydimethylsiloxane samples of varying stiffness.
  • Demonstrated performance and precision comparable to traditional methods.
  • Validated the efficacy of the portable VCCE instrument for soft material characterization.

Conclusions:

  • The portable VCCE instrument democratizes soft material testing.
  • The device is suitable for space-limited settings and non-expert users.
  • Open-source data and scripts facilitate broader adoption and further research.